WO2014058904A1 - Silver nanoplate compositions and methods - Google Patents

Silver nanoplate compositions and methods Download PDF

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Publication number
WO2014058904A1
WO2014058904A1 PCT/US2013/063920 US2013063920W WO2014058904A1 WO 2014058904 A1 WO2014058904 A1 WO 2014058904A1 US 2013063920 W US2013063920 W US 2013063920W WO 2014058904 A1 WO2014058904 A1 WO 2014058904A1
Authority
WO
WIPO (PCT)
Prior art keywords
solution
silver
nanoplates
silver nanoplates
composition
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2013/063920
Other languages
English (en)
French (fr)
Inventor
Steven J. Oldenburg
Martin G. MIRANDA
David S. SEBBA
Todd J. HARRIS
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sienna Labs Inc
NanoComposix Inc
Original Assignee
Sienna Labs Inc
NanoComposix Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=50475524&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2014058904(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority to CN201380061329.2A priority Critical patent/CN104822412B/zh
Priority to EP13845112.5A priority patent/EP2906286B1/en
Priority to DK13845112.5T priority patent/DK2906286T3/en
Priority to RU2015112182A priority patent/RU2646809C2/ru
Priority to PL13845112T priority patent/PL2906286T3/pl
Priority to BR112015008063-4A priority patent/BR112015008063A2/pt
Priority to IL296593A priority patent/IL296593B2/en
Priority to ES13845112.5T priority patent/ES2629903T3/es
Priority to JP2015536844A priority patent/JP6325552B2/ja
Priority to IL311688A priority patent/IL311688B2/en
Priority to CA2887687A priority patent/CA2887687A1/en
Priority to KR1020157012210A priority patent/KR102154207B1/ko
Priority to IL305614A priority patent/IL305614B2/en
Priority to AU2013329450A priority patent/AU2013329450B2/en
Priority to HK16100850.1A priority patent/HK1212931B/xx
Application filed by Sienna Labs Inc, NanoComposix Inc filed Critical Sienna Labs Inc
Priority to IL316627A priority patent/IL316627A/en
Priority to KR1020207025520A priority patent/KR20200106984A/ko
Priority to MX2015004524A priority patent/MX2015004524A/es
Publication of WO2014058904A1 publication Critical patent/WO2014058904A1/en
Priority to IL238112A priority patent/IL238112B/en
Priority to US14/681,379 priority patent/US9212294B2/en
Anticipated expiration legal-status Critical
Priority to US14/947,508 priority patent/US9526745B2/en
Priority to US15/374,942 priority patent/US10688126B2/en
Priority to AU2017219126A priority patent/AU2017219126B2/en
Priority to AU2018241065A priority patent/AU2018241065B2/en
Priority to IL274971A priority patent/IL274971B2/en
Priority to US16/902,455 priority patent/US11583553B2/en
Priority to AU2020204436A priority patent/AU2020204436B2/en
Priority to AU2022259793A priority patent/AU2022259793C1/en
Priority to US18/089,047 priority patent/US12029831B2/en
Priority to AU2024227663A priority patent/AU2024227663A1/en
Ceased legal-status Critical Current

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    • C09D139/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Coating compositions based on derivatives of such polymers
    • C09D139/04—Homopolymers or copolymers of monomers containing heterocyclic rings having nitrogen as ring member
    • C09D139/06—Homopolymers or copolymers of N-vinyl-pyrrolidones
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2300/00—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices
    • A61L2300/10—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices containing or releasing inorganic materials
    • A61L2300/102—Metals or metal compounds, e.g. salts such as bicarbonates, carbonates, oxides, zeolites, silicates
    • A61L2300/104—Silver, e.g. silver sulfadiazine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/06—Metallic powder characterised by the shape of the particles
    • B22F1/068—Flake-like particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2301/00—Metallic composition of the powder or its coating
    • B22F2301/25—Noble metals, i.e. Ag Au, Ir, Os, Pd, Pt, Rh, Ru
    • B22F2301/255—Silver or gold
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2325/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
    • C08J2325/18—Homopolymers or copolymers of aromatic monomers containing elements other than carbon and hydrogen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2329/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
    • C08J2329/02—Homopolymers or copolymers of unsaturated alcohols
    • C08J2329/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/08—Metals
    • C08K2003/0806—Silver

Definitions

  • the invention relates to a method for preparing high optical density solutions of silver platelet nanoparticles (e.g., nanoplates) and to nanoparticles, solutions and substrates prepared by said methods.
  • silver platelet nanoparticles e.g., nanoplates
  • Nanoparticles including nanospheres, nanorods, nanowires, nanocubes, nanoplates, as well as other shapes can be synthesized from a range of materials.
  • a platelet nanoparticle is a nanoplate.
  • Nanoparticles made from metals including gold and silver have unique optical properties which can be tuned to interact with light throughout the electromagnetic spectrum due to the localized surface plasmon resonance supported by these nanomaterials. Technologies that take advantage of the unique optical properties of silver nanoparticles include, but are not limited to, diagnostic, photonic, medical, and obscurant technologies. A subset of these technologies including photothermal tumor ablation, hair removal, acne treatment, wound healing, and antimicrobial applications among others, may use solutions of nanoparticles with high optical densities.
  • Silver nanoplates which are also known as silver platelet nanoparticles or nanoprisms, are of particular interest for technologies that utilize nanoparticle optical properties due to their tunable spectral peaks and extremely high optical efficiencies. While methods of fabricating silver nanoplates via photoconversion (Jin et al. 2001; Jin et al. 2003), pH-controlled photoconversion (Xue 2007), thermal growth (Hao et al. 2004; Hao 2002; He 2008; Metraux 2005), templated growth (Hao et al. 2004; Hao 2002), and seed mediated growth (Aherne 2008; Chen; Carroll 2003; Chen; Carroll 2002, 2004; Chen et al. 2002; He 2008; Le Guevel 2009; Xiong et al. 2007) have been developed, these methods generate relatively dilute solutions with correspondingly low visible and near-infrared optical density.
  • a more concentrated solution of the silver nanoplates is of utility and can be particularly advantageous.
  • the shape of the nanoparticle can undergo a change resulting in a shift in optical properties, such as optical density. In many cases, these changes result in an undesirable degradation of the nanoparticle' s optical properties.
  • several embodiments of the present invention provide methods of preparing silver nanoplates solutions in higher concentrations with increased optical density while reducing degradation of the silver nanoplates' optical properties.
  • methods of the present invention provide for preparing high optical density solutions of silver nanoplates from dilute silver nanoplate solutions that partially, substantially, or fully preserve the shape and optical properties of the fabricated silver nanoplates when the particle concentration is increased.
  • Various embodiments of the invention provide methods for preparing high optical density solutions of silver nanoplates, as well as the nanoparticles and solutions prepared by those methods.
  • the process comprises the replacement of one or more original components (e.g., chemical or biological agents) bound to, or otherwise coupled to, the nanoparticle surface with a stabilizing agent.
  • the stabilizing agent does not replace the original component but rather supplements or alters the original component.
  • the stabilizing agent can be a biological or chemical agent that stabilizes the nanoplates before, during, and/or after concentration, thereby allowing for the production of a stable, high optical density solution of silver nanoplates.
  • the process also comprises a method of increasing the concentration of silver nanoplates within the solution, and thus increasing the solution optical density.
  • the stability e.g., the characteristics of the nanoparticles in the solution, such as shape, size, optical properties, peak response, plasmonic properties, etc.
  • the high optical density solution is unaffected or substantially unaffected during the process.
  • Several embodiments of the invention comprise a high optical density solution of silver nanoplates that have been stabilized with stabilizing agents (e.g., surface bound molecules, chemical agents, and/or biological agents).
  • the invention comprises a solution of silver nanoplates that have been surface functionalized with chemical or biological agents that are physisorbed to the surface, molecularly bound to the surface through specific interactions, or encapsulate each nanoparticle.
  • a high optical density solution of silver nanoplates is associated with a substrate.
  • a portion of the nanoplates in solution bind to the substrate to create a nanoplate-substrate composite.
  • the high optical density solutions of silver nanoplates can be exposed to substrates to generate nanoplate composites where a substantial portion of the surface area of a substrate is coated with nanoplates.
  • the substrate comprises fibers, cloth, mesh, bandages, socks, wraps, other articles of clothing, sponges, high porosity substrates, particles with edge lengths greater than 1 micron, beads, hair, skin, paper, absorbent polymers, foam, wood, cork, slides, roughened surfaces, biocompatible substrates, filters, and/or medical implants.
  • a process for increasing the optical density of a stable, silver nanoplate solution comprises (i) providing a solution comprising a plurality of silver nanoplates having a plate shape and having a peak optical density between 0.1 - 10 cm " 1 ; (ii) adding a stabilizing agent to the solution; (iii) adding a buffer to the solution; and (iv) concentrating the buffer-containing solution to form a concentrated solution, wherein the concentrated solution comprises a plurality of silver nanoplates having the plate shape, and wherein the concentrated solution has a peak optical density greater than 10 cm "1 .
  • a method for producing a stable, high optical density solution of silver nanoplates comprises the following: (i) adding a stabilizing agent to a solution of silver nanoplates, (ii) adding a buffer (e.g., such as a buffer containing a water soluble salt) to the solution of silver nanoplates, (iii) mixing the stabilizing agent with the buffer and the silver nanoplates over a period of time sufficient for the stabilizing agent to interact with the water soluble salt in the buffer on the surface of the silver nanoplates, and (iv) concentrating the solution to a peak optical density greater than 10 cm "1 (e.g., 50-1500 cm ).
  • a buffer e.g., such as a buffer containing a water soluble salt
  • the stabilizing agents can include one or more of sodium citrate, a water soluble polymer, (such as polystyrene sodium sulfonate and/or a hydrocarbon polymer derivatized with sulfonate), a poly vinyl based polymer (such as polyvinyl alcohol (PVA) and/or polyvinylpyrrolidone (PVP)), polyethylene glycol, polyacrylic acid, or dextran.
  • the water soluble salt can include one or more of the sulfates, carbonates, chromates, borates, phosphates, and sulfites, acetates, and nitrates.
  • the combination of the stabilizing agent and a buffer containing one or more water soluble salts provides stabilization to the nanoplate formulation, wherein one of the components of the salt can interact with the stabilizing agent to crosslink the stabilizing agent and increase the stability of a coating on the silver nanoplate.
  • an initial solution of silver nanoplates can be produced from a solution comprising one or more stabilizing agents and a silver source (e.g., such as a silver salt, silver seeds), and in which chemical agents, biological agents, mixing, electromagnetic radiation, and/or heat are used to reduce the silver source (e.g., photoconversion, pH controlled photocon version, thermal growth, templated growth, and/or seed mediated growth).
  • a process for concentrating a solution of silver nanoplates includes the steps of providing a solution comprising a plurality of silver nanoplates having a peak optical density below 10 cm “1 (e.g., 0.1 - 9.9 cm “1 , 1-9 cm “1 , 3-7 cm “1 , 1-5 cm “1 , and/or 5-10 cm “1 ), adding a stabilizing agent to the solution, adding a buffer containing a water soluble salt to the solution, and concentrating the solution to a peak optical density greater than 10 cm “1 (e.g., 80-150 cm “1 , 900 - 1100 cm “1 , 100 cm “1 , 1000 cm “1 or more).
  • 10 cm “1 e.g., 80-150 cm “1 , 900 - 1100 cm “1 , 100 cm “1 , 1000 cm “1 or more.
  • the peak optical density in increased by 10%, 50%, 100%, 200%, 500%, 1,000%, 10,000% or more, and/or increased by a ratio of 1: 1.5, 1:2, 1:5, 1: 10 or more, and/or increased by a factor of 1, 1.5, 2, 5, 10, 25, 50, 100, 1000 or more.
  • the silver nanoplates have an aspect ratio of between 1.5 and 50 (e.g., 1.5 - 10, 25-50). In one embodiment, the silver nanoplates comprise an edge length between 10 nm and 300 nm (e.g., 50-250, 65-100 nm).
  • the stabilizing agent comprises sodium citrate, or at least one water soluble polymer selected from the group consisting of polystyrene sodium sulfonate and a hydrocarbon polymer derivatized with sulfonate.
  • the water soluble salt comprises one or more of sulfates, carbonates, chromates, borates, phosphates, and sulfites, acetates, and nitrates.
  • the stabilizing agent comprises at least one of the group consisting of polyvinyl pyrollidone, polyvinyl alcohol, polyethylene glycol, polyacrylic acid, and dextran.
  • the stabilizing agent comprises a thiol- containing molecule.
  • the thiol-containing molecule can comprise a dihydrolipoic acid or a derivative thereof.
  • the process optionally includes the steps of isolating the concentrated nanoplates and encapsulating the isolated concentrated nanoplates (e.g., with silica or another material).
  • the process includes the step of concentrating the encapsulated nanoplates to an optical density greater than 10 cm “1 (e.g., 100 cm "1 , 1000 cm “1 or more).
  • the stabilizing agent is added prior to the formation of the silver nanoplates.
  • the nanoplates are concentrated by tangential flow filtration.
  • the silver concentration is greater than 1.0 mg/mL (e.g., 1-1000, 10-300 mg/mL).
  • a process for generating metal oxide coated silver nanoplates is provided.
  • the method can include the steps of providing a solution of silver nanoplates having a peak absorption spectrum between 500 and 1500 nm (e.g., GOO- MOO, 800-1200 nm) and an optical density greater than 10 cm “1 (e.g., 100 cm “1 , 1000 cm “1 or more) and contacting this solution with a solution of metal oxide or metal oxide precursor in an amount sufficient to form a metal oxide coating on an exterior surface of the silver nanoplates.
  • the silver nanoplates are associated with a stabilizing polymer (e.g., polyvinyl pyrollidone, polyvinyl alcohol, or a combination thereof) prior to contact with the metal oxide precursor, such as by disposing the stabilizing polymer on an exterior surface of the silver nanoplates.
  • a stabilizing polymer e.g., polyvinyl pyrollidone, polyvinyl alcohol, or a combination thereof
  • the metal oxide is silica or includes silica.
  • a process for generating a solution of silver nanoplates includes the steps of providing a solution comprising a reducing agent, a stabilizing agent, a water soluble polymer, and a silver salt, forming a plurality of silver seeds from the solution, growing the plurality of silver seeds into a plurality of silver nanoplates in the solution to form a silver nanoplate solution, adding a stabilizing agent to the silver nanoplate solution, adding a buffer containing a water soluble salt to the silver nanoplate solution, and concentrating the silver nanoplate solution to a peak optical density greater than 10 cm "1 (e.g., 100 cm "1 , 1000 cm “1 or more).
  • a composition comprises or consists essentially of a solution of silver nanoplates, wherein the silver nanoplates comprise a poly vinyl polymer.
  • the poly vinyl polymer comprises polyvinyl pyrollidone or polyvinyl alcohol.
  • the composition (e.g., solution) comprises one or more salts, such as water soluble salts (e.g., sulfates, carbonates, chromates, borates, phosphates, and sulfites, acetates, and nitrates).
  • the poly vinyl polymer is associated with the salt, the poly vinyl polymer coats at least a portion of the silver nanoplates, and/or the poly vinyl polymer is disposed on an exterior surface of the silver nanoplates.
  • the solution comprises silver nanoplates in a concentration effective to adhere to a non-metal coating material present in the solution.
  • the solution may be formulated to be concentrated.
  • the optical density of the solution or of the silver nanoplates is greater than 10 cm "1 (e.g., 100 cm "1 , 1000 cm “1 or more).
  • the solution may contain a salt (sulfates, carbonates, chromates, borates, phosphates, and sulfites, acetates, and nitrates) at a concentration greater than 0.1 mM (e.g., 0.1 mM to 10 mM).
  • the solution has a pH greater than 7 (e.g., 8 - 13).
  • an absorption spectrum of the silver nanoplates comprises a peak wavelength of between 500 and 1500 nm (e.g., 600-1400, 550-1100, 810-830, 1000-1100 nm).
  • the solution comprises bicarbonate.
  • the silver nanoplates may be silica-coated.
  • the silver nanoplates can have edge lengths between 10 nm and 500 nm (e.g., 50-300, 100-150 nm).
  • a composition comprises or consists essentially of a solution of silver nanoplates bonded to a shell material comprising a poly vinyl polymer.
  • the silver nanoplates are substantially coated with the poly vinyl polymer.
  • the composition includes a metal oxide, the metal oxide comprises silica, the poly vinyl polymer comprises polyvinyl alcohol or polyvinylpyrrolidone, the silver nanoplates are bonded to polyvinyl alcohol and silica, and/or the silver nanoplates are bonded to polyvinylpyrrolidone and silica, or any combination thereof.
  • the composition includes a moiety selected from an amine moiety and a mercapto moiety.
  • the moiety is bound to the silica.
  • the composition includes aluminum.
  • the optical density of the solution is greater than 10 cm “1 (e.g., 100 - 1100 cm “1 , or more).
  • the optical density of the silver nanoplates is greater than 10 cm “1 (e.g., 100 cm “1 , 1000 cm “1 , 11- 5000 cm “1 , or more).
  • the solution comprises a water soluble salt (such as sulfates, carbonates, chromates, borates, phosphates, and sulfites, acetates, and nitrates) at a concentration greater than 0.1 mM (e.g., 0.5 mM to 2 mM, 0.1 mM to 10 mM).
  • the pH is greater than 7 (e.g., 8, 9, 10, 11, 12, 13).
  • the silver nanoplates comprise a peak wavelength of between 500 and 1500 nm (e.g., 700-1300, 810-830, 1000-1100 nm).
  • a composition includes silver nanoplates at least partially coated by a shell material that includes a poly vinyl polymer, wherein the mean thickness of the shell material is between 1 nm and 50 nm (e.g., 5, 15, 40 nm).
  • the silver nanoplates have at least one edge length of between 10 nm and 500 nm. (e.g., 25, 100, 250, 300 nm).
  • a kit comprises or consists essentially of one or more containers comprising nanoplates with an optical density greater than 10 cm “1 (e.g., 100 cm “1 , 1000 cm “1 or more), a solution suitable for coating nanoplates with a shell of metal oxide, and instructions for use thereof.
  • the nanoplates comprise a poly vinyl polymer.
  • the poly vinyl polymer interacts (e.g., cross links or otherwise couples) with the water soluble salt (e.g., sulfates, carbonates, chromates, borates, phosphates, and sulfites, acetates, and nitrates).
  • a solution includes silver nanoplates at least partially coated by a silica coating, wherein the silver nanoplates comprise a peak optical density of greater than 10 cm “1 (e.g., 11-5000 cm “1 , 90 - 1100 cm “1 , or more).
  • the silica coating has a shell thickness between 2 and 100 nm (e.g., 10-70, 30- 90, 40-60 nm).
  • the solution comprises a water soluble salt (e.g., sulfates, carbonates, chromates, borates, phosphates, and sulfites, acetates, and nitrates) at a concentration greater than 0.1 mM (e.g., 0.1 mM to 10 mM).
  • the solution has a pH greater than 7 (e.g., 9, 12, 13).
  • the silver nanoplates have a peak absorption spectrum comprising a peak wavelength between 500 nm and 1500 nm (e.g., 800-1400 nm).
  • the silica coating is disposed on an exterior surface of the silver nanoplates.
  • the coating includes an amine moiety or a mercapto moiety. In one embodiment, the coating further includes aluminum. In one embodiment, the coating includes bicarbonate. In one embodiment, the coating includes polyvinylpyrrolidone. In one embodiment, the silver nanoplates comprise a thickness between 1 nm and 50 nm (e.g., 10-40, 15-25, 5-30). In one embodiment, the silver nanoplates comprise at least one edge length between 10 nm and 500 nm (e.g., 20-400, 50- 250, 300-450).
  • a process for generating a solution of silver nanoplates with extremely high optical density includes the steps of (i) adding a concentration stabilizing chemical agent to a solution of silver nanoplates or precursor reagents and (ii) increasing the concentration of silver nanoplates to increase the optical density of the solution.
  • the silver nanoplates have an aspect ratio of between 1.5 and 25 (e.g., 1.5 - 10, 1.5-5, 10-30, 25-50); and/or the nanoplate has an edge length between about 10 nm and 250 nm(e.g., 25-180, 50-150 nm); and/or the nanoplate is triangular in cross section; and/or the nanoplate is circular in cross section.
  • the perimeter of the nanoplate cross section has between 4 and 8 edges (e.g., 5, 6, 7).
  • the solution of silver nanoplates is formed using one or more of a photoconversion method, a pH-controlled photoconversion method, a thermal growth method, a seed mediated growth method, and/or a solution comprising a shape stabilizing agent or agents and a silver source.
  • chemical or biological agents, and/or electromagnetic radiation, and/or heat, or a combination thereof are used to reduce the silver source.
  • the solution of silver nanoplates is formed from some combination of a reducing agent, a shape stabilizing agent, a light source, a heat source, and a silver source.
  • an acid, base, or buffer (also termed a “buffering agent”) is added to change the solution pH.
  • the concentration stabilizing chemical agent is added prior to, during, and/or after the formation of the silver nanoplates.
  • the concentration stabilizing chemical agent acts as a shape stabilizing agent.
  • the concentration stabilizing chemical agent acts as a reducing agent.
  • the concentration stabilizing chemical agent acts as an agent to change the solution pH.
  • the concentration stabilizing chemical agent is a water soluble polymer.
  • the polymer is any one or more of a derivative of polysulfonate, sodium polystyrene sulfonate, a derivative of a vinyl polymer, and a polyvinyl alcohol (PVA).
  • the PVA has a molecular weight of less than about 80,000 Dalton, between about 80,000 Dalton and 120,000 Dalton, and/or more than about 120,000 Dalton.
  • the polymer is polyvinylpyrrolidone (PVP).
  • the PVP has a molecular weight of less than about 20,000 Dalton, more than about 20,000 Dalton, between about 20,000 Dalton and 60,000 Dalton, and/or more than about 60,000 Dalton.
  • the polymer is an ethylene oxide derivative.
  • the polymer is a polyethylene glycol (PEG).
  • the PEG has a molecular weight of less than about 5,000 Dalton, between about 5,000 Dalton and 10000 Dalton, and/or more than about 10000 Dalton.
  • the PEG contains a single functional group.
  • the PEG contains two functional groups.
  • the functional group or groups consist of one or more of the following: an amine, thiol, acrylate, alkyne, maleimide, silane, azide, hydroxyl, lipid, disulfide, fluorescent molecule, and/or biotin, or combinations thereof.
  • the functional group or groups can be any one or more of an amine, thiol, acrylate, alkyne, maleimide, silane, azide, hydroxyl, lipid, disulfide, fluorescent molecule, and/or biotin.
  • the concentration stabilizing agent is a carbohydrate derivative.
  • the polymer is a monosaccharide, a disaccharide, an oligosaccharide, a polysaccharide, and/or dextran.
  • the dextran has a molecular weight that is less than about 2000 Dalton (e.g., 500, 1000, 1500 Dalton), between about 2000 Dalton and 5000 Dalton (e.g., 3000, 4000 Dalton), and/or more than about 5000 Dalton (e.g., 6000, 8000, 10000 Dalton or more).
  • the concentration stabilizing chemical agent is any one or more of a phenol, a monomeric phenol, a dimeric phenol, a trimeric phenol, a polyphenol, a tannic acid, is gum Arabic, a biological molecule, a protein, a bovine serum albumin, streptavidin, biotin, a peptide, an oligonucleotide, a naturally occurring oligonucleotide, a synthetic oligonucleotide, a metal or metalloid oxide, and/or a silicon dioxide shell.
  • a silicon dioxide shell has ranges in thickness from about less than 1 nm to about 100 nm (e.g., 2-90, 5-25, 30-70).
  • a combination of stabilizing agents is used.
  • the solvent can be one or more of water, an alcohol, ethanol, isopropyl alcohol, t-butanol, a mixture of a water and an alcohol.
  • the concentration of silver nanoplates is increased using tangential flow filtration.
  • the tangential flow filtration is performed using a tangential flow filter membrane.
  • the tangential flow membrane is made from a cellulose ester or mix of cellulose esters.
  • the tangential flow membrane is made from one or more of polyetheresulfone and/or polysulfone.
  • the tangential flow membrane has a molecular weight cut off of less than about 10 kD (e.g., 1, 5, 8 kD), of between about 10 kD and 500 kD (e.g., 50, 250, 400 kD), of more than about 500 kD (e.g., 750, 1000, 5000 kD or more), of less than about 0.05 ⁇ (e.g., 0.01, 0.03 ⁇ ), of between about 0.05 ⁇ and 0.5 ⁇ (e.g., 0.1, 0.25, 0.4 ⁇ ), and/or of more than about 0.5 ⁇ (e.g., 1.0, 2, 5, 10, 100 ⁇ ).
  • the silver nanoplate solution is concentrated to produce a solution with an optical density of greater than about 10 cm , greater than about 50 cm “1 , greater than about 75 cm “1 , greater than about 100 cm “1 , and/or greater than about 500 cm “1 (e.g., 100-1000, 100-2000 cm “1 ).
  • the solvent of the concentrated solution is exchanged using tangential flow filtration.
  • the concentrated solution is processed to remove residual chemicals using tangential flow filtration.
  • a solution of nanoparticles comprising silver nanoparticles is coated with a polymer with an optical density greater than 100 cm "1 (e.g., 200, 500, 700, 1500 cm "1 , or more)
  • the solution of silver nanoplates is incubated with a substrate.
  • the substrate is removed from the solution of silver nanoplates and dried.
  • One embodiment of the present invention provides processes for making solutions of plasmonic nanoparticles, such as e.g., silver nanoplates, that are suitable for performing thermomodulation of a target tissue region.
  • Thermomodulation of a target tissue can be achieved when a composition comprising a plurality of plasmonic nanoparticles is administered to a subject under conditions such that an effective amount of the plasmonic nanoparticles localize to a domain of the target tissue region, and exposing the target tissue region to energy delivered from a excitation surface plasmon resonance source in an amount effective to induce thermomodulation of the domain of the target tissue region.
  • materials described herein are useful for performing targeted ablative or non- ablative heating of tissue.
  • a method for performing targeted ablative or non-ablative heating of a tissue to treat a mammalian subject in need thereof comprising the steps of (i) topically administering to a skin surface of the subject the composition of plasmonic nanoparticles including silver nanoplates; (ii) providing penetration means to redistribute the plasmonic particles from the skin surface to a component of dermal tissue; and (iii) causing irradiation of the skin surface by light.
  • the invention comprises compositions that, when used with appropriate methods of administration and excitation with a light-based energy source, can achieve noninvasive or minimally-invasive treatment of skin and underlying tissues, or other accessible tissue spaces with the use of nanoparticles.
  • Use of optical density solutions of plasmonic nanoparticles, such as e.g., silver nanoplates, with short pulse width laser excitation (e.g. pulse widths from 0.1ms to Is) can create steep transient heat gradients that selectively target ablative or non-ablative heat to structures within several cell layers of where particles are localized, e.g..
  • the treatment can include, but is not limited to, hair removal, hair growth and regrowth, and skin rejuvenation or resurfacing, acne removal or reduction, wrinkle reduction, pore reduction, ablation of cellulite and other dermal lipid depositions, wart and fungus removal, thinning or removal of scars including hypertrophic scars, atrophic scars, and keloids, abnormal pigmentation (such as port wine stains), tattoo removal, and/or skin inconsistencies (e.g. in texture, color, tone, elasticity, hydration).
  • Other therapeutic or preventative methods include, but are not limited to, treatment of hyperhidrosis, anhidrosis, Frey's Syndrome (gustatory sweating), Horner's Syndrome, and Ross Syndrome, actinici keratosis, keratosis follicularis, dermatitis, vitiligo, pityriasis, psoriasis, lichen planus, eczema, alopecia, psoriasis, malignant or non-malignant skin tumors.
  • Treatment of hyperhidrosis, anhidrosis, Frey's Syndrome (gustatory sweating), Horner's Syndrome, and Ross Syndrome actinici keratosis, keratosis follicularis, dermatitis, vitiligo, pityriasis, psoriasis, lichen planus, eczema, alopecia, psoriasis, malignant or non-malignant skin tumors.
  • FIG. 1 illustrates the optical spectrum of a silver nanoplate solution fabricated using a photoconversion method according to one embodiment of the present invention. As fabricated, these silver nanoplates, in one embodiment, have a peak optical density of less than 1 cm "1 (e.g., approximately 0.8 cm "1 )
  • FIG. 2 illustrates the optical spectrum of a silver nanoplate solution fabricated using a seeded growth method according to one embodiment of the present invention. As fabricated, these silver nanoplates have a peak optical density of less than 3 cm "1 .
  • FIG. 3A is a transmission electron microscope image of a silver nanoplate solution fabricated using a photoconversion method according to one embodiment of the present invention.
  • FIG. 3B is a transmission electron microscope image of a silver nanoplate solution fabricated using a seeded growth method according to one embodiment of the present invention.
  • FIG. 4 is the optical spectra of silver nanoplates without the addition of a stabilizing agent and water soluble salt according to one embodiment of the invention before tangential flow concentration and after tangential flow concentration.
  • FIG. 5 is the normalized optical spectra of silver nanoplates without the addition of a stabilizing agent and water soluble salt according to one embodiment of the invention before tangential flow concentration and after concentration.
  • FIG. 6 is the optical spectra according to one embodiment of silver nanoplates combined with polyvinyl alcohol and a water soluble salt before concentration and after concentration.
  • FIG. 7 is the normalized optical spectra according to one embodiment of silver nanoplates combined with polyvinyl alcohol and a water soluble salt before concentration and after concentration.
  • FIG. 8 illustrates an optical extinction spectra of high optical density nanoplate solutions processed using the methods described in various embodiments of the invention.
  • FIG. 9 illustrates steps for producing one embodiment of silver nanoplates by fabricating the silver nanoplates, adding stabilizing agents, concentrating the nanoplates and optionally coating the nanoplates with silica.
  • thermomodulation of a target tissue can be achieved when a composition comprising a plurality of plasmonic nanoparticles is administered to a subject under conditions such that an effective amount of the plasmonic nanoparticles localize to a domain of the target tissue region.
  • the target tissue region is exposed to energy delivered from a excitation surface plasmon resonance source. The energy is delivered in an amount effective to induce thermomodulation of the domain of the target tissue region.
  • the optical density is a function of the path length through the liquid sample and is expressed in units of cm "1 . In some instances, optical density is expressed without the unit cm "1 - such as in instances in which a standard path length of 1 cm is used.
  • the maximum optical density of silver nanoplates in as-synthesized solutions without any additional processing is typically less than 10 cm “1 (e.g., 0.1 - 9.9 cm “1 , 1-9 cm “1 , 3-7 cm “1 , 1-5 cm “1 , and/or 5-10 cm “1 ).
  • silver nanoplates can be produced with increased optical densities.
  • optical densities of solutions containing plasmonic particles including silver nanoplates are most effective with an optical density that is higher than 10 cm “1 (e.g., 11- 5000 cm “1 , 15-2000 cm “1 , 20-1000 cm “1 , 80-150 cm “1 , 90-110 cm “1 , 900 - 1100 cm “1 , 100 cm “ ⁇ 1000 cm “1 or more) and formulated into a pharmaceutical or cosmetic carrier and stable for days, months, weeks, or years without alterations in particle shape and/or properties.
  • 10 cm “1 e.g., 11- 5000 cm “1 , 15-2000 cm “1 , 20-1000 cm “1 , 80-150 cm “1 , 90-110 cm “1 , 900 - 1100 cm “1 , 100 cm “ ⁇ 1000 cm “1 or more
  • optical densities of solutions containing plasmonic particles including silver nanoplates are higher than 10 cm “1 (e.g., 11-5000 cm “1 , 15-2000 cm “1 , 20-1000 cm “1 , 80-150 cm “1 , 90-110 cm “1 , 900 - 1100 cm “1 , 100 cm “1 , 1000 cm “1 or more) and formulated into a pharmaceutical or cosmetic carrier and stable for days, months, weeks, or years without alterations in particle shape and/or properties.
  • the carrier and composition are suitable for topical administration to the skin of a mammalian subject, such that the plasmonic nanoparticles are present in an effective amount for selective thermomodulation of a component of the skin.
  • the nanoparticle formulations are formulated for application by a sponge applicator, cloth applicator, direct contact via a hand or gloved hand, spray, aerosol, vacuum suction, high pressure air flow, or high pressure liquid flow, roller, brush, planar surface, semi-planar surface, wax, ultrasound and other sonic forces, mechanical vibrations, hair shaft manipulation (including pulling, massaging), physical force, thermal manipulation, and/or other treatments.
  • nanoparticle formulation treatments are performed alone, in combination, sequentially or repeated 1-24 times, or more.
  • the plasmonic nanoparticles are capable of selectively localizing to a first component of the skin, where physical massage or pressure, ultrasound, or heat increase the selective localization of the nanoparticles to this first component.
  • the nanoparticles are selectively removable from components of the skin other than the first component, such removal can be accomplished with acetone, alcohol, water, air, peeling of the skin, chemical peeling, waxing, or reduction of the plasmonic compound.
  • the nanoparticles have a coat layer to increase solubility of the nanoparticles in the carrier and/or reduce "stickiness" and accumulation in non-target areas.
  • an exterior surface of the nanoparticle is modified, such as to include a layer of a polymer, polar monomer, non-polar monomer, biologic compound, a metal (e.g., metallic thin film, metallic composite, metal oxide, or metallic salt), a dielectric, or a semiconductor.
  • the exterior surface modification is polar, non-polar, charged, ionic, basic, acidic, reactive, hydrophobic, hydrophilic, agonistic, and/or antagonistic.
  • At least one dimension of at least one nanoparticle within a solution of plasmonic nanoparticles is below 50-100 nm (e.g., 1, 5, 10, 25, 40, 60, 75, 90 nm), and the nanoparticle surface can be coated with a matrix (e.g. silica) of 10-100 nm thickness or more (e.g., 20, 50, 75, 150, 200, 500 nm) in order to increase that dimension or particle to 50-100 nm or more (e.g., 75, 80, 110, 140, 200, 800 nm).
  • This increased dimension size can increase the delivery of all nanoparticles to a target region (e.g., hair follicle, pore, skin, etc.) and limit delivery to non-target region (e.g. dermis).
  • materials described herein are useful for performing targeted ablative or non-ablative heating of tissue.
  • a method for performing targeted ablative or non-ablative heating of a tissue to treat a mammalian subject in need thereof comprising the steps of (i) topically administering to a skin surface of the subject the composition of plasmonic nanoparticles including silver nanoplates; (ii) providing penetration means to redistribute the plasmonic particles from the skin surface to a component of dermal tissue; and (iii) causing irradiation of the skin surface by light.
  • the light source comprises excitation of mercury, xenon, deuterium, or a metal- halide, phosphorescence, incandescence, luminescence, light emitting diode, or sunlight.
  • the penetration means comprises high frequency ultrasound, low frequency ultrasound, massage, iontophoresis, high pressure air flow, high pressure liquid flow, vacuum, pre-treatment with fractionated photothermolysis or dermabrasion, or a combination thereof.
  • the irradiation comprises light having a wavelength of light between about 200 nm and about 10,000 nm (e.g., 300-9000, 700-1300, 800-1200, 800-1300, 900-1100, 550-1100, 810-830, 1000-1100 nm), a fluence of about 1 to about 100 joules/cm 2 (e.g., 5-20, 40-70, 10-90), a pulse width of about 1 femptosecond to about 1 second, and a repetition frequency of about 1 Hz to about 1 THz (e.g., 1-10, 10-100, 100-1000, 1000- 10000, 10000-100000 Hz or more).
  • a wavelength of light between about 200 nm and about 10,000 nm (e.g., 300-9000, 700-1300, 800-1200, 800-1300, 900-1100, 550-1100, 810-830, 1000-1100 nm), a fluence of about 1 to about 100 joules/cm 2 (e.g., 5-20,
  • An object of one embodiment of the subject matter described herein is to provide compositions, that when used with appropriate methods of administration and excitation with a light-based energy source can achieve noninvasive and minimally-invasive treatment of skin and underlying tissues, or other accessible tissue spaces with the use of nanoparticles.
  • Use of optical density solutions of plasmonic nanoparticles, such as e.g., silver nanoplates, with short pulse width laser excitation (e.g. pulse widths from 0.1ms to Is) can create steep transient heat gradients that selectively target ablative or non-ablative heat to structures within several cell layers of where particles are localized, e.g..
  • the treatment can include, but is not limited to, hair removal, hair growth and regrowth, and skin rejuvenation or resurfacing, acne removal or reduction, wrinkle reduction, pore reduction, ablation of cellulite and other dermal lipid depositions, wart and fungus removal, thinning or removal of scars including hypertrophic scars, atrophic scars, and keloids, abnormal pigmentation (such as port wine stains), tattoo removal, and/or skin inconsistencies (e.g. in texture, color, tone, elasticity, hydration).
  • Other therapeutic or preventative methods include, but are not limited to, treatment of hyperhidrosis, anhidrosis, Frey's Syndrome (gustatory sweating), Horner's Syndrome, and Ross Syndrome, actinici keratosis, keratosis follicularis, dermatitis, vitiligo, pityriasis, psoriasis, lichen planus, eczema, alopecia, psoriasis, malignant or non-malignant skin tumors.
  • nanoplates such as silver nanoplates
  • the axial length of two of the principle axes is at least two times greater than the axial length of the shortest principle axis, and the shortest principal axial length is less than about 500 nm (e.g., 450. 400, 350, 300, 250, 100, 150, 50, 30, 20, 10 nm).
  • the "edge length" of the nanoplate is defined to be the average of the length of the two longer principle axes.
  • the “thickness” of the nanoplate is defined to be the shortest principal axis.
  • the ratio of the edge length to the thickness is referred to as the "aspect ratio”.
  • the average aspect ratio of the silver nanoplates is greater than 1.5, 2, 3, 4, 5, 7, 10, 20, 30, or 50 and any range therein. In one embodiment the average aspect ratio of the silver nanoplates is between 1.5 and 25, 2 and 25, 1.5 and 50, 2 and 50, 3 and 25, and/or 3 and 50.
  • a nanoplate has edge lengths less than 500 nm, 250 nm, 200 nm, 150 nm, 100 nm, 80 nm, 60 nm or 50 nm. In one embodiment the nanoplate has edge lengths greater than 5 nm, 10 nm, 20 nm, 30 nm, 50 nm or 100 nm. In various embodiments the edge length is from 30 nm to 100 nm, 20 nm to 150 nm, 10 nm to 200 nm, 10 nm to 300 nm.
  • the nanoplate has a thickness that is less than 500 nm, 300 nm, 200 nm, 100 nm, 80 nm, 60 nm, 50 nm, 40 nm, 30 nm, 20 nm, and/or 10 nm and any range therein.
  • the nanoplate thickness is from 5 nm to 20 nm, 5 nm to 30 nm, 10 nm to 30 nm, 10 nm to 50 nm, 10 nm to 100 nm.
  • Various embodiments of silver nanoplates have a variety of different cross sectional shapes including (but not limited to) circular, triangular, or shapes that have any number of discrete edges.
  • the nanoplates can be shaped as circular, ovals, squares, rectangles, rods, stars, tubes, pyramids, prisms, triangles, branches, or comprised of a planar surface.
  • the nanoplates have less than 20, 15, 10, 8, 6, 5, or 4 edges, and/or any number between 20 and 1.
  • the nanoplates can have between 1 and 20, 15, 10, 8, 6, 5, 4, or 3 edges. In one embodiment the nanoplates have more than 2, 3, 4, or 5 edges.
  • the silver nanoplates have sharp corners and in other embodiments the corners are rounded. In some embodiments of silver nanoplates, there are a variety of different cross sectional shapes within the same sample. In other embodiments of silver nanoplate solutions greater than 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, or 90% of the number of particles in solution are silver nanoplates with the other particles having different shapes including but not limited to spherical, cubic, and irregular. In various embodiments, a silver nanoplate solution has a percentage of silver nanoplates, with other particles in the solution having different shapes, including but not limited to spherical, cubic, and/or irregular.
  • a silver nanoplate solution has 5% to 100%, 10% to 50%, 50% to 100%, 30% to 60%, 60% to 100%, 40% to 70%, 70% to 100%, 50% to 80%, 80% to 100%, 60% to 90%, and/or 90% to 100% of the number of particles in solution are silver nanoplates with the other particles having different shapes including but not limited to spherical, cubic, and/or irregular.
  • methods can enhance the stability of silver nanoplates to facilitate increased optical density while retaining at least 50%, 60%, 70%, 80%, 90%, 95%, 98% or more of the silver nanoplate shape while undergoing a concentrating process.
  • methods can enhance the stability of silver nanoplates to facilitate increased optical density while changing shape from the nanoplate to another shape (e.g., spherical, cubic, and/or irregular) in less than 50%, 40%, 30%, 25%, 20%, 10%, 5%, 3,%, 2%, 1% of the silver nanoplates while undergoing a concentrating process.
  • the nanoplates can have one, two, or more flat sides.
  • the nanoplates are pyramidal.
  • Silver nanoplates have distinct advantages over other plasmonic nanoparticle shapes and compositions.
  • silver nanoplates have advantages over plasmonic nanoparticle shapes and compositions including gold nanoshells and gold nanorods due to potential for lower production costs (less reaction waste and lower material costs).
  • optical density (O.D.) per weight of metal is greater for sliver nanoplates relative to gold nanorods when randomly oriented in solution and irradiated with nonpolarized light because the planar surface of a nanoplate resonates with both polarizations of incident light.
  • absorbance of silver nanoplates is higher than that of gold nanoshells for the same weight of metal as a greater fraction of light is absorbed versus scattered with a nanoplate architecture relative to a nanoshell. For many applications, these benefits in cost and absorbance can only be realized if nanoplates are stabilized at high concentration and for long periods of time, which is the subject of one embodiment of the present invention.
  • Silver nanoplates as fabricated by current traditional methods including photoconversion, pH controlled photoconversion, thermal growth, and/or seed mediated growth methods typically have optical densities ranging from 0.1 to 10 cm “1 (e.g., e.g., 0.1 - 9.9 cm “1 , 1-9 cm “1 , 3-7 cm “1 , 1-5 cm “1 , and/or 5- 10 cm “1 ).
  • a number of technologies seek higher optical density solutions of silver nanoplates.
  • methods can increase the optical density of silver nanoplate solutions to greater than 10 cm “1 , 20 cm “1 , 30 cm “1 , 50 cm “1 , 80 cm “1 , 100 cm “1 , 150 cm “1 , 200 cm “1 , 300 cm “1 , 400 cm “1 , 500 cm “1 , 600 cm “1 , 700 cm “1 , 800 cm “1 , 900 cm “1 , and/or 1000 cm “1 , or more.
  • Silver nanoplates may be fabricated using photoconversion (Jin et al. 2001 ; Jin et al. 2003), pH controlled photoconversion (Xue 2007), thermal growth (Hao et al. 2004; Hao 2002; He 2008; Metraux 2005), templated growth (Hao et al. 2004; Hao 2002), seed mediated growth (Aherne 2008; Chen; Carroll 2003; Chen; Carroll 2002, 2004; Chen et al. 2002; He 2008; Le Guevel 2009; Xiong et al. 2007), all herein incorporated by reference, or alternative methods.
  • Alternative methods include methods in which the silver nanoplates are formed from a solution comprising one or more stabilizing agents and a silver source, and in which chemical agents, biological agents, mixing, electromagnetic radiation, and/or heat are used to reduce the silver source.
  • FIG. 1 An optical spectrum of silver nanoplates fabricated using one embodiment of a photoconversion method is shown in FIG 1.
  • the peak wavelength of the optical spectra (100) is at a wavelength of 775 nm with an optical density of 0.74 cm "1 .
  • the optical spectra of silver nanoplates fabricated using one embodiment of a seed mediated growth method is shown in FIG 2.
  • the peak wavelength of the optical spectra (200) is at a wavelength of 930 nm with an optical density of 2.58 cm "1 .
  • FIG. 3A A transmission electron microscope image of silver nanoplates made using a photoconversion method is shown in FIG. 3A.
  • FIG 3B A transmission electron microscope image of silver nanoplates made using a seed mediated growth method is shown in FIG 3B.
  • FIG. 4 shows the optical density of one embodiment of a solution of the nanoplates in the absence of a concentration stabilization agent before (400) and after (410) concentration.
  • the optical resonance peak that corresponds to the plasmon resonance of the nanoplates shifts from 815 nm (420) to 745 nm (430) demonstrating that the average edge length of the nanoplates is reduced.
  • FIG. 5 shows a normalized plot of the nanoplate spectra shown in FIG. 4.
  • the intensity of the peak in the 700 nm - 850 nm range is correlated to the number of nanoplates in solution.
  • the intensity of the peak in the 400 nm range is correlated to the number of spheroidal particles in solution.
  • concentration the ratio of the longer wavelength peak (520) to the shorter wavelength peak (540) is 3.
  • concentration the ratio of the longer wavelength peak (530) to the shorter wavelength peak (550) is 0.8. This changing ratio demonstrates that the silver nanoplates are changing shape and that the number of nanoplates in solution is reduced.
  • a solution of nanoplates can be stabilized.
  • FIG. 6 shows the optical density of one embodiment of a solution of nanoplates that have been stabilized by polyvinyl alcohol in a solution of borate (e.g., sodium borate, potassium tetraborate, etc.).
  • the peak wavelength of the nanoplate peak is the same for both the unconcentrated (620) and concentrated (630) solutions indicating that the edge length of the nanoplates is the same before concentration (600) and after concentration (610).
  • FIG. 7 shows the normalized spectrum which demonstrates that the spectral shape of the peak does not change before concentration (700) and after concentration (710), thereby indicating that in one embodiment, a surface coating is sufficient to prevent the shape of the nanoparticles from shifting.
  • greater than 10%, greater than 20%, greater than 30% or greater than 50% of the silver nanoplates change shape without a surface protection. In other embodiments less than 20%, less than 10% or less than 5% of the silver nanoplates undergo a shape change if the nanoplates are coated with a protective surface coating.
  • a spectrum of a nanoplate solution concentrated to have a peak optical density of -900 cm "1 is shown in FIG. 8.
  • the silver nanoplates are formed in a multi-step process.
  • the steps to concentrating nanoplates are shown in FIG. 9 and comprise of fabricating the silver nanoplates (900), adding stabilizing agents (910), concentrating the nanoplates (920) and optionally coating the nanoplates with silica (930).
  • the steps can be taken in any order.
  • a first step forms silver seeds from an aqueous solution comprising a reducing agent, a stabilizing agent, a water soluble polymer and a silver salt.
  • the reducing agent, stabilizing agent and water soluble polymer may be mixed prior to the addition of a silver source.
  • the reducing agent used in the silver seed formation step can be formaldehyde, sodium borohydride, another borohydride, hydrogen gas, carbon monoxide gas, hydrazine, or reducing sugars, or combinations of these.
  • the reducing agent may be present at a concentration of at least 0.1 mM, 1 mM, or 3mM.
  • the reducing agent may be present at a concentration from 0.1 mM to 1 mM, 0.3 mM to 3 mM, 0.5 mM to 2 mM, 0.1 mM to 2 mM, 0.1 mM to 10 mM.
  • the stabilizing agent may be a salt, a polymer, or a biomolecule.
  • the stabilizing agent is trisodium citrate or another citrate derivative.
  • the water soluble polymer is a polyanionic polymer including, but not limited to, polymers derivatized with sulphonate, derivatives of polystyrene sulphonate such as an inorganic salt of polystyrene sulphonate, or a monovalent salt of polystyrene sulphonate.
  • the water soluble polymer is poly (sodium styrenesulphonate) (PSSS).
  • PSSS poly (sodium styrenesulphonate)
  • the PSSS has a molecular weight between about 3 kDa and about 1,000 kDa.
  • the PSSS has a molecular weight of from 3 kDa to 10 kDa, 5 kDa to 50 kDa, 10 kDa to 100k Da, 30 kDa to 300 kDa, 50 kDa, to 500 kDa, 100 kDa to 1000 kDa, 300 kDa to 100 kDa, 500 kDa, to 1000 kDa.
  • the silver salt may be any water soluble silver salt including but not limited to silver acetate, silver perchlorate, silver nitrate, silver trifluoroacetate, or silver triflate.
  • a step for the formulation of silver nanoplates includes having the seeds grown into silver nanoplates in an aqueous solution comprising silver seeds, an acidic reducing agent and a silver salt.
  • the acidic reducing agent is citric acid or ascorbic acid.
  • the silver salt for the step where seeds are grown into silver nanoplates may be any water soluble silver salt including silver acetate, silver perchlorate, silver nitrate, silver trifluoroacetate, silver triflate, or combinations thereof.
  • the silver nanoplates are stirred at a shear flow rate between 1 s "1 and 100,000 s "1 (e.g., at least 10, 50, 100, 200, 300, 400, 500, 1000, 2000, 5000, 10000, 20000, 50000, 75000, 90000 s "1 ).
  • the silver nanoplates are stirred at a shear flow rate from between 10 s “1 and 100 s “1 , 50 s “1 and 500 s “1 , 100 s “1 and 300 s “1 , 200 s “1 and 500 s “1 , 100 s “1 and 400 s “1 , 500 s “1 and 1000 s “1 , 1000 s “1 and 10000 s “1 , 2000 s “1 and 5000 s “1 , 1000 s “1 and 2000 s “1 , 5000 s “1 and/or 10000 s “1 .
  • silver nanoplates have molecules that are adsorbed or otherwise bound to the particle surface.
  • the molecules on the surface are the reactants or reactant by-products of the synthesis.
  • One object of this invention is to partially or fully exchange the molecules that are bound to the surface of the silver nanoplates with other molecules that more fully protect the particles from changing shape during concentration.
  • Another object of the invention is to use a stabilizing agent during fabrication that generates plate shapes and also stabilizes the plates during subsequent concentration.
  • stabilizing agents that may be utilized include chemical or biological agents that are physisorbed (e.g., absorbed by non-molecular binding forces) to the surface, molecularly bound to the surface through specific interactions (e.g. thiol or amine), or encapsulate the surface (e.g. a metal oxide or metalloid oxide shell).
  • specific chemical agents of interest include polymers.
  • specific chemical agents of interest include polymers such as polysulphonates.
  • the stabilizing polymer is derivatized with sulfonates.
  • vinyl polymers, carbohydrates, ethylene oxides, phenols, and carbohydrates may be employed.
  • polystyrene sodium sulfonate polyvinyl alcohol (PVA), polyvinyl pyrrolidone (PVP), polysaccharides, phenol, tannic acid, dextran, and polyethylene glycol (PEG) including PEG molecules which contain one or more chemical groups (e.g. amine, thiol, acrylate, alkyne, maleimide, silane, azide, hydroxyl, lipid, disulfide, fluorescent molecule, or biomolecule moieties).
  • PVA polyvinyl alcohol
  • PVP polyvinyl pyrrolidone
  • PEG polyethylene glycol
  • PEG polyethylene glycol
  • Specific molecules of interest include proteins, peptides, oligonucleotides, biotin, alkane thiols, lipoic and dihydrolipoic acid and derivatives of these acids, bovine serum albumin, streptavidin, neutravidin, wheat germ agglutinin, naturally occurring and synthetic oligonucleotides and peptides, including synthetic oligonucleotides which have one or more chemical functionalities (e.g. amine, thiol, dithiol, acrylic phosphoramidite, azide, digoxigenin, alkynes, or biomolecule moieties).
  • Specific encapsulating chemical agents of interest include metal oxide shells such as Si0 2 and Ti0 2 .
  • Stabilizing agents may be added prior to the formation of silver nanoplates, during the formation of silver nanoplates, or after the formation of silver nanoplates.
  • An additional chemical agent of interest is gum arabic.
  • the stabilizing agent also modifies the pH of the solution.
  • the silver nanoplates are fabricated in aqueous solutions.
  • the silver nanoplates are fabricated in other solutions that can include ethanol, isopropanol, or organic solvents such as heptane, toluene, or butanol.
  • an acid, base or buffering agent is added to change the solution pH either before, during, or after the addition of a stabilant.
  • a buffer typically containing a water soluble salt, is added.
  • the water soluble salt comprises borate.
  • the water soluble salt comprises sodium borate.
  • the nanoplates are suspended in a sodium bicarbonate buffer or a sodium borate buffer.
  • the pH of the solution after addition of the pH modifying agent is greater than pH 6, pH 7, pH 8, pH 9, or pH 10.
  • the pH of the solution after addition of the pH modifying agent is from pH 6 to pH 8, pH 6.0 to pH 9, pH 7 to pH 10, pH 7 to pH H, pH 8 to pH 10, pH 8 to pH l l, or pH 7 to pH 12.
  • the combination of a nanoplate coating and a water soluble salt present in a buffer provides stabilization to the nanoplate formulation.
  • one of the components of the salt can interact with the nanoplate coating or stabilizing agent to crosslink the coating and increase the stability of the coating.
  • crosslinking can include non-covalent bonds (e.g., ionic bonds, hydrophobic interactions, hydrogen bonds and van der Waals forces including dispersion attractions, dipole-dipole and dipole-induced dipole interactions) and/or covalent bonds between the nanoplate surface, water soluble salts, and/or coating materials/stabilizing agents.
  • the presence of the water-soluble salt present in a buffer changes the binding affinity of a stabilizing agent or coating material to the nanoplate surface, e.g., by modifying the zeta potential and/or charges on the surface of the nanoplate.
  • the water-soluble salt present in a buffer changes the binding affinity of a stabilizing agent or coating material to itself through covalent or non-covalent binding.
  • the presence of the water-soluble salt intermediates binding of a stabilizing agent to the surface of a particle by becoming physisorbed to the particle surface in association with the stabilizing agent.
  • the water-soluble salt intermediates binding of polymer to itself by associating with units of the stabilizing agent or coating materials and lowering the free energy necessary for the coating materials to order on or around a nanoplate surface.
  • the nanoplate coating is a polymer and the crosslinking produces a viscoelastic gel surrounding all or a portion of the nanoplate.
  • the stabilizing agent is mixed with a buffer containing a water-soluble salt, and both the stabilizing agent and a component of the water soluble salt bind to the surface of the nanoplate.
  • a polyvinyl based polymer such as polyvinylalcohol or polyvinylpyrrolidone is mixed with a borate salt such as sodium borate.
  • FIG. 6 and FIG. 7 show the effect of stabilizing silver nanoplates with polyvinyl alcohol and sodium borate before concentration to preserve the shape of the nanoparticles.
  • stabilizing agents can be solid or liquid formulations that are added to the silver nanoplate solution.
  • the stabilizing agents have an affinity for the surface of the silver nanoplates and are able to associate with the plate surface at wide ranges of relative concentrations.
  • bound molecules on the silver nanoplates are displaced by a stabilizing agent.
  • a stabilizing agent such as a polymer, is covalently attached to a silver atom present on the surface of the nanoplate.
  • the polymer coating may extend over all or a portion of the exterior surface of a silver nanoplate.
  • compositions containing polymer-coated silver nanoplates may have an optical density less than or equal to 10 cm "1 .
  • such solutions have polymer-coated silver nanoplates and an optical density greater than 10 cm "1 ; these solutions can be achieved by concentrating or purifying polymer- coated silver nanoplates present in a more dilute solution.
  • the stabilants are added to the as-fabricated silver nanoplate solution.
  • the solution of nanoplates is washed, or the residual reactants are otherwise removed.
  • the suspending solution is exchanged one or more times with one or more solution, e.g., to wash the nanoplates or to alter the pH of the solution, before the stabilizing agents are added.
  • kits containing, in one or more containers, nanoplates in a solution having an optical density greater than 10 cm "1 and a metal oxide-containing solution or a metal oxide precursor-containing suitable for coating the nanoplates with a shell (or coating) of the metal oxide.
  • the containers are provided with instructions for use thereof.
  • the kits contain nanoplates having a coating containing a poly vinyl polymer.
  • the poly vinyl polymer contains borate.
  • Nanoplates having a stabilizer coating are characterized as provided herein or otherwise known in the art, such as by particle analyzers or emission detectors such as NMR, Fourier transform spectroscopy, mass spectrometry, or similar assays.
  • the mixture of the stabilant and the silver nanoplates can undergo a number of different processes including heating, boiling, boiling under reflux, rotary evaporation, vacuum, stirring, stirring with magnetic stir bars, stirring with overhead mixers, stirring with homogenizers, shaking, microfluidization, refrigeration, and freezing.
  • the silver nanoplates can be washed to remove residual reactants or to exchange the solution with another solution.
  • the exchange of solution can be accomplished using dialysis, centrifugation, filtration, or tangential flow filtration (also known as cross flow filtration).
  • the number of wash volumes exchanged within the sample is zero, 1, 2, 3, 4, 5, 1 and 5, 5 to 10, 10 to 20, or more than 20 wash volumes, inclusive.
  • Nanoparticle solutions with optical densities greater than 10 cm “1 can be fabricated using centrifugation, evaporation, filtration, dialysis or tangential flow filtration.
  • One embodiment of this invention utilizes tangential flow filtration as the process of concentrating the silver nanoplate solution.
  • the filter membrane utilized may be formed from a variety of materials. In various embodiments, specific filter membrane materials of interest can include cellulose esters, polysulfone, and polyetheresulfone.
  • the filter membrane utilized may have pores with a molecular weight cutoff of less than about 10 kD, between 10 kD to 500 kD, or more than about 500 kD, and/or pore sizes of less than about 0.05 ⁇ , between 0.05 ⁇ and 0.5 ⁇ , or larger than about 0.5 ⁇ .
  • the filter membrane utilized may have pores with a molecular weight cutoff between 10 kD, to lOOkD, lOkD to 500kD, 20kD to 500kD, 20kD to 250kD and/or pore sizes between 0.02 ⁇ and 0.1 ⁇ , 0.05 ⁇ and 0.2 ⁇ , 0.05 ⁇ and 0.5 ⁇ , 0.10 ⁇ and 0.2 ⁇ , 0.1 ⁇ and 0.5 ⁇ .
  • Tangential flow filtration can also be utilized to change the solvent in which the silver nanoplates are dispersed.
  • specific solvents of interest include water and alcohols (e.g.
  • FIG. 8 shows an embodiment of a solution of nanoplates that has been concentrated to a peak optical absorbance of 930 cm "1 .
  • the silver nanoplate solution concentration is increased to produce a final solution with optical densities of greater than about 5 cm “1 , greater than about 10 cm “1 , greater than about 50 cm “1 , greater than about 75 cm “1 , greater than about 100 cm “1 , greater than about 500 cm “1 , and/or greater than about 1000 cm “1 .
  • the silver nanoplate solution concentration is increased to produce a final solution with optical densities from between 10 cm “1 to 100 cm ⁇ 30 cm “1 to 300 cm , 50 cm “1 to 500 cm “1 , 100 cm “1 to 1000 cm “1 , 300 cm “1 to 3000 cm “1 , or 500 cm “1 to 5000 cm “1 .
  • One embodiment of the invention is where the silver nanoplate solution concentration is increased to above 10 6 , 10 7 , 10 8 , 10 9 , 10 10 , 10 11 , 10 12 or 10 13 particles per milliliter.
  • the silver nanoplate solution concentration is increased to be between 10 6 and 10 13 , 10 7 and 10 13 , 10 8 and 10 13 , 10 9 and 10 13 , 10 10 and 10 13 , 10 11 and 10 13 , or 10 12 and 10 13 particles per milliliter.
  • the silver concentration is greater than 0.1, 1.0, 2, 4, 5, 7, 8, 9, and/or 10 mg/mL.
  • the silver concentration is between 0.1 to 1.0, 0.3 to 3.0, 0.5 to 5.0, 1.0 to 10.0, 3.0 to 30.0, 5.0 to 50.0, 10.0 to 200.0, 1.0 to 200.0, 1.0 to 500.0, or 10.0 to 500.0 mg/mL.
  • the concentrated silver nanoplates are encapsulated with a shell of silica.
  • the coating may extend over all or a portion of the exterior surface of a silver nanoplate. For example, at least 5%, 10%, 15%, 20%, 25%, 50%, 75%, 80%, 90%, 95%, 99%, 99.9% or greater than 99.9% of the exterior surface of a silver nanoplate is coated with silica.
  • the concentrated plates can be mixed with an alcohol (e.g. ethanol or isopropanol).
  • an aminosilane or mercaptosilane is added to the solution to bind silane molecules to the surface of the nanoplates. The binding of silane molecules to the surface of nanoplates is specific to the surface coating on the nanoplates.
  • nanoparticle coatings that stabilize the nanoplates during processing will not be compatible with the formation of a silica shell.
  • the surface of the nanoplates is coated with a molecule that has an affinity for silane molecules in solution.
  • a polyvinyl based polymer such as polyvinylalcohol or polyvinylpyrrolidone is bound to the surface of the nanoplate before the addition of silane molecules.
  • a polyvinyl based polymer surface is complexed with water soluble salt present in a buffer (e.g., one or more of the sulfates, carbonates, chromates, borates, phosphates, and sulfites, acetates, and nitrates) before the addition of silane molecules.
  • a buffer e.g., one or more of the sulfates, carbonates, chromates, borates, phosphates, and sulfites, acetates, and nitrates
  • silane molecules e.g., one or more of the sulfates, carbonates, chromates, borates, phosphates, and sulfites, acetates, and nitrates
  • silane molecules e.g., one or more of the sulfates, carbonates, chromates, borates, phosphates, and sulfites, acetates, and n
  • the nanoplates coated with a silica shell can be transferred to water and concentrated using a concentration method such as tangential flow filtration.
  • the silica shells are mixed with a solution of aluminum salt such as aluminum chloride, a stabilizing polymer such as polyvinylpyrrolidone, or a buffer such as bicarbonate.
  • the peak optical density of the solution as measured in a 1 cm path length cuvette is above 10, 20, 50, 100, 500, or 1000. In various embodiments, the peak optical density of the solution as measured in a 1 cm path length cuvette is between 10-100, 20-200, 30-300, 50-500, 100- 1000, 200-1000, 300-1000, 500-1000, and/or 200-2000, and any combinations therein. In another embodiment the silver concentration is above 0.1 mg/mL, 1 mg/mL or above 10 mg/mL.
  • the silver concentration is between 0.1 to 1.0, 0.3 to 3.0, 0.5 to 5.0, 1.0 to 10.0, 3.0 to 30.0, 5.0 to 50.0, 10.0 to 200.0, 1.0 to 200.0, 1.0 to 500.0, and/or 10.0 to 500.0 mg/mL, and any combinations therein.
  • the silica shell thickness is between 2 and 100 nm, and in another embodiment between 5 and 50 nm.
  • the silica shell thickness is between 3 and 20 nm, 5 and 20 nm, 10 and 20 nm, 10 and 50 nm, 10 and 100 nm, 1 and lOnm, 3 and 30nm, 5 and 50nm, and/or 5 and 200nm, and any combinations therein.
  • the silica shell can be fabricated from a mixture of silanes including but not limited to aminopropyl triethoxy silane, mercaptopropyl triethoxy silane and tetraethylorthosilicate.
  • the silica shell can contain nitrogen or sulfur atoms.
  • the silica shell can contain amine moieties or mercapto moieties.
  • the silica shell can contain aluminum or sodium atoms.
  • the solution contains a buffer, that includes a water soluble salt (e.g., one or more of the sulfates, carbonates, chromates, borates, phosphates, and sulfites, acetates, and nitrates) at a concentration greater than 0.1 mM, 1.0 mM or 10.0 mM.
  • a water soluble salt e.g., one or more of the sulfates, carbonates, chromates, borates, phosphates, and sulfites, acetates, and nitrates
  • the water soluble salt concentration may be from 0.1 mM to ImM, 0.3mM to 3mM, 0.5mM to 5mM, ImM to 10 mM, 1 mM to 30 mM, 1 mM to 50 mM, 1 mM to 1000 mM, and any combinations therein.
  • the solution can have a peak absorption wavelength between 500 nm and 1500 nm, 500 nm to 1200 nm, 500 nm to lOOOnm, 600nm to 1200nm, 700nm to 1200nm, 700nm to 1500nm, 700nm to 900nm, and/or 900 to 1100 nm, and any combinations therein.
  • the concentrated particles are stored at temperatures below -10, 0, 4, 6, 10, or 20 degrees C.
  • the particles are frozen and dried under vacuum.
  • the particles are freeze dried.
  • the particles are supercritically dried.
  • an additional stabilant or other cryoprotectant is added to the solution before the particles are heat dried or freeze dried.
  • high optical density solutions of silver nanoplates are associated with a substrate.
  • substrates include fibers, cloth, mesh, bandages, socks, wraps, other articles of clothing, sponges, high porosity substrates, particles with edge lengths greater than 1 micron, beads, hair, skin, paper, absorbent polymers, foam, wood, cork, slides, roughened surfaces, biocompatible substrates, filters, or medical implants.
  • solutions of silver nanoplates at a concentration of at least 1 mg/mL, 10 mg/mL, and/or 100 mg/mL are incubated with the substrate.
  • the silver nanoplate concentration incubated with the substrate is between 0.1 to 1.0, 0.3 to 3.0, 0.5 to 5.0, 1.0 to 10.0, 3.0 to 30.0, 5.0 to 50.0, 10.0 to 20.0, 5.0 to 50.0, 3.0 to 50.0, 1.0 to 100.0 mg/mL, 10.0 to 100.0, 20.0 to 100.0, 30.0 to 100.0 mg/mL.
  • the solutions of silver nanoplates incubated with the substrate are between 10 6 u and 1013 , 107' and 1013 , 108° and 1013 , 10 9 and 10 13 , 10 10 and 10 13 , 10 11 and 10 13 , 10 12 and 10 13 or greater than 10 13 particles per milliliter.
  • the silver nanoplates are prepared at an optical density of at least 10, 20, 50, 100, 300, 500, 1000 and/or 2000 cm “1 before incubating with the substrate. In various embodiments the silver nanoplates are prepared at an optical density of betweenlO-100, 20-200, 30-300, 50-500, 100-1000, 200-1000, 300-1000, 500-1000, or 200- 2000.
  • the substrate is chemically treated to increase the binding of the nanoplates to the substrate.
  • the substrate could be functionalized with a molecule that yielded a positively or negatively charged surface.
  • the pH of the incubating solution is selected in order to optimize binding.
  • the silver nanoplates cover at least 5%, 10%, 20%, 30%, 50% or 75% of the substrate. In various embodiments, the silver nanoplates cover between 5% to 10%, 10% to 100%, 10% to 50%, 50% to 100%, 30% to 100%, 30% to 70%, 40% to 80%, 50% to 90%, 60% to 100%, 70% to 100%, 80% to 100%, 90% to 100%, 0% to 5%, o% to 10%, 0% to 20%, 0% to 30%, or 0% to 50% of the substrate. In another embodiment, other solvents or chemicals are added to the incubation solution. In another embodiment a biological linker (e.g. antibodies, peptides, DNA) is used to bind the high optical density silver nanoplates to the surface of the substrate.
  • a biological linker e.g. antibodies, peptides, DNA
  • the incubation is for less than 1 minute, 5 minutes, 20 minutes, 60 minutes, or 120 minutes. In various embodiments, the incubation is between 0 to 1 minute, 1 minute to 120 minutes, 5 minutes to 120 minutes, 20 minutes to 120 minutes, 60 minutes to 120 minutes, 5 minutes to 60 minutes, 10 minutes to 60 minutes, 20 minutes to 60 minutes, 0 minutes to 10 minutes, 0 minutes to 20 minutes, or 0 minutes to 5 minutes.
  • the substrate is separated from the incubating solution and dried.
  • the substrate can be dried using air drying, heat drying, freeze drying, or supercritical drying.
  • the dried substrate can be further processed by soaking the substrate in another material, painting the substrate with another material, or exposing the substrate to another material that is in the vapor phase.
  • the methods disclosed herein include certain actions taken by a practitioner; however, they can also include any third-party instruction of those actions, either expressly or by implication. For example, actions such as “identifying a target region of skin tissue” include “instructing the identification of a target region of skin tissue.” [0087]
  • the ranges disclosed herein also encompass any and all overlap, subranges, and combinations thereof. Language such as “up to,” “at least,” “greater than,” “less than,” “between,” and the like includes the number recited. Numbers preceded by a term such as “about” or “approximately” or “substantially” include the recited numbers.
  • “about 3 mm” includes “3 mm.”
  • the terms “approximately”, “about” and/or “substantially” as used herein represent an amount or characteristic close to the stated amount or characteristic that still performs a desired function or achieves a desired result.
  • the terms “approximately”, “about”, and “substantially” may refer to an amount that is within less than 10% of, within less than 5% of, within less than 1% of, within less than 0.1% of, and within less than 0.01% of the stated amount or characteristic.
  • Silver nanoplates were synthesized using silver seeds prepared through the reduction of silver nitrate with sodium borohydride in the presence of sodium citrate tribasic and poly sodium styrene sulfonate under aqueous conditions.
  • Silver seed preparation 21.3 mL of an aqueous 2.5 mM sodium citrate tribasic solution was allowed to mix under magnetic stirring. 1 mL of a 2 g/L poly styrene sodium sulfonate (PSSS) solution was then prepared in a separate beaker. 21.3 mL of a 0.5 mM silver nitrate solution was then prepared by dissolving the salt in water.
  • PSSS poly styrene sodium sulfonate
  • a method for increasing a silver nanoplate solution from 5 cm “1 to 150 cm “1 comprises the steps of adding PVA and sodium borate to silver nanoplates, and concentrating the solution with tangential flow filtration.
  • 1.2 L of silver nanoplates with a peak optical density of about 4 cm "1 were mixed with 4 L of anhydrous ethanol and about 49 mL of ammonium hydroxide solution.
  • 0.6 mL of a dilute aminopropyltriethoxysilane (APTES) was added to the solution.
  • 6.5 mL of tetraethylorthosilicate (TEOS) solution was added.
  • 1 L of the solution was concentrated using a 500 kD polysulfone tangential flow membrane with 1050 cm of surface area. The final solution volume was decreased to 150 mL, increasing the silver nanoparticle solution optical density to about 40 cm "1 .
  • APTES dilute aminopropyltriethoxysilane
  • TEOS tetraethylorthosilicate
  • a method for increasing a silver nanoplate solution from 4 cm “1 to 40 cm “1 comprises the steps of adding anhydrous ethanol, ammonium hydroxide solution, aminopropyltriethoxysilane (APTES), and tetraethylorthosilicate (TEOS) to the silver nanoplates, and concentrating the solution with tangential flow filtration.
  • APTES aminopropyltriethoxysilane
  • TEOS tetraethylorthosilicate
  • a silica shell was grown on the surface of 800 nm resonant (-75 nm edge length) polyvinylpyrrolidone (PVP) capped silver nanoplates.
  • 400 mL of a solution of 800 nm resonant PVP capped silver nanoplates at a concentration of 2 mg/mL (20 cm “1 O.D.) was added to 2.3 L of reagent grade ethanol and 190 mL Milli-Q water under constant stirring.
  • 4.3 mL of dilute aminopropyl triethoxysilane (215 uL APTES in 4.085 mL isopropanol) was then added to the solution, followed immediately by the addition of 44 mL of 30% ammonium hydroxide.
  • a 40 mL solution of 40 O.D. solution of concentrated silver nanoplates stabilized with polyvinylalcohol and sodium borate was spun at 3000 RCF for 30 minutes. The supernatant was removed and the pellet was re-dispersed with bath sonication.
  • the concentrated silver nanoplates had an optical density greater than 900 O.D. as is shown in FIG. 8.
  • a 5 mL solution of 1000 O.D. silver nanoplates was added to a 3" x 3" section of absorbent cloth (Absorber Synthetic Drying Chamois, Clean Tools). After addition, the substrate was allowed to air dry. Once dried, the silver nanoplates were bound to the surface of the absorbent cloth and were not released when the cloth was subsequently wet and water removed by applying pressure. References

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CN109500405A (zh) * 2019-01-17 2019-03-22 鲁东大学 一种三角银纳米片的制备方法
CN109500405B (zh) * 2019-01-17 2022-02-22 鲁东大学 一种三角银纳米片的制备方法
WO2022238468A1 (en) 2021-05-12 2022-11-17 Basf Se Compositions, comprising platelet-shaped transition metal particles
CN114160785A (zh) * 2021-11-17 2022-03-11 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） 一种温和条件可控纳米银溶液的制备方法
CN114160785B (zh) * 2021-11-17 2024-01-26 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） 一种温和条件可控纳米银溶液的制备方法

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