CN113075803A - Graphene nanosheet-based magnetic response intelligent optical material and preparation method thereof - Google Patents
Graphene nanosheet-based magnetic response intelligent optical material and preparation method thereof Download PDFInfo
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/0009—Materials therefor
- G02F1/0036—Magneto-optical materials
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/182—Graphene
- C01B32/194—After-treatment
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- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
- E06B3/66—Units comprising two or more parallel glass or like panes permanently secured together
- E06B3/67—Units comprising two or more parallel glass or like panes permanently secured together characterised by additional arrangements or devices for heat or sound insulation or for controlled passage of light
- E06B3/6715—Units comprising two or more parallel glass or like panes permanently secured together characterised by additional arrangements or devices for heat or sound insulation or for controlled passage of light specially adapted for increased thermal insulation or for controlled passage of light
- E06B3/6722—Units comprising two or more parallel glass or like panes permanently secured together characterised by additional arrangements or devices for heat or sound insulation or for controlled passage of light specially adapted for increased thermal insulation or for controlled passage of light with adjustable passage of light
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/0102—Constructional details, not otherwise provided for in this subclass
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect
- G02F1/092—Operation of the cell; Circuit arrangements
Abstract
The invention discloses a graphene nanosheet-based magnetic response intelligent optical material and a preparation method thereof. According to the method, magnetic nanoparticles are deposited on the surfaces of the graphene nano sheets by a liquid phase deposition method, then the deposited graphene nano sheets are uniformly dispersed in a liquid medium, and the orientation of the graphene nano sheets is controlled by an external magnetic field, so that the light transmittance is regulated. Under the action of a magnetic field, when the graphene nanosheets are arranged in parallel to the observation direction, the material is in a light-transmitting state; when the graphene nanoplatelets are aligned perpendicular to the viewing direction or randomly oriented, the light transmission of the material is rapidly reduced. The novel intelligent optical material with dynamically adjustable light transmittance has important application prospects in the fields of intelligent windows, optical switches, anti-counterfeiting, information encryption and the like. The preparation method has the advantages of simple operation, stable performance, environmental protection, mass production and the like.
Description
Technical Field
The invention belongs to the technical field of magnetic control graphene intelligent window material preparation, and particularly relates to a preparation method of a novel magnetic tuning intelligent window optical material based on graphene composite nanosheets.
Background
The intelligent window material is a novel optical functional material with light transmittance capable of being actively or passively regulated through external stimulation, and has wide application prospects in the fields of building energy conservation, commodity anti-counterfeiting, privacy protection, optical switches and the like. Typically, dynamic tuning of such optical properties can be achieved by chemical, refractive index, morphology of the structural elements or external stimuli triggering the switch. In recent years, various strategies have been adopted to design smart optical materials, including optical materials driven using liquid crystals, suspended colloidal particles, photonic crystal electric fields, light, temperature, mechanical forces, and magnetic fields, and the like. The intelligent optical materials have complex manufacturing process, high cost and low efficiency, and still face huge challenges in practical application. Therefore, a new stimulus-responsive smart optical material having a faster switching speed, a higher light transmittance modulation efficiency, and a low manufacturing cost has been a target of attention.
The magnetic field tuning is an effective remote and non-contact control method, and provides possibility for realizing efficient and rapid tuning of optical properties of the intelligent optical material. Especially for a superparamagnetic material with zero coercive force, the optical behavior of the material can be reversibly and rapidly adjusted through an external magnetic field. In recent years, some magnetic-responsive smart optical materials based on superparamagnetic nanoparticles have been reported in succession. For example, using Fe3O4The Ag nanosheet driven by the nanoparticle-based magnetofluid can realize the regulation and control of light transmittance along with the orientation of a magnetic field, and the light transmittance of the material can be regulated within the range of 80-100% under the action of a 2800Oe magnetic field. In addition, a superparamagnetic magnet containing an amino group is usedThe magnetic fluid of the mineral nanoparticles drives the Au nanosheets to realize dynamic tuning of light transmittance, and the light transmittance of the sample is changed between 42% and 72%. However, these materials have greatly limited their practical application due to high manufacturing costs, and narrow optical tuning range.
Disclosure of Invention
In order to solve the problems, the invention provides a magnetic response intelligent optical material based on graphene nanosheets and a preparation method thereof.
Aiming at the design target, the technical scheme provided by the invention is as follows:
by taking the window-blind effect as a reference, the shape anisotropy of the graphene nanosheets is utilized, and the magnetic nanoparticles are deposited on the graphene nanosheets to enable the graphene nanosheets to have magnetic response capability. The graphene nanosheets deposited with the magnetic nanoparticles are dispersed in a liquid medium and encapsulated in a gap between parallel glass plates, and the orientation of the graphene nanosheets is regulated by applying an external magnetic field, so that the dynamic regulation and control of the magnetic field of the light transmittance is realized. The non-contact regulation and control intelligent window has obvious application advantages in the fields of optical switches, commodity anti-counterfeiting, information encryption and the like.
The magnetic response intelligent optical material based on the graphene nanosheets comprises the graphene nanosheets, magnetic nanoparticles and a liquid medium, wherein the magnetic nanoparticles are deposited on the surface of graphene through a liquid phase deposition method, and the mass ratio of the graphene nanosheets to the magnetic nanoparticles is controlled to be 0.5: 1-3: 1; and dispersing the graphene nanosheets subjected to magnetic particle deposition in a liquid medium to form a suspension with the concentration of 10-15 wt%.
The graphene nanosheet can be a commercially available graphene nanosheet or a commercially available graphene oxide nanosheet, the nanosheet can be in any polygonal shape, the thickness of the nanosheet is not more than 20nm, the size of the nanosheet is 5-20 microns, and the nanosheet is subjected to ultrasonic dispersion treatment in deionized water before use.
The magnetic nanoparticles may be Fe3O4、NiFe2O4、CoFe2O4、ZnFe2O4、MgFe2O4Any one of the above. The particles are obtained by chemical coprecipitation methodThe particle shape is spherical, the particle diameter is 5 nm-20 nm, and the saturation magnetization is not lower than 40 emu/g. The mass ratio of the graphene nanosheets to the magnetic nanoparticles is controlled to be 0.5: 1-3: 1.
The liquid medium is any one of water, ethylene glycol EG, propylene carbonate PC and polyethylene glycol diacrylate PEGDA, and when the liquid medium is water, 0.2-1.0 vol% of polyvinyl alcohol PVA needs to be added into the liquid medium to properly increase the viscosity of the liquid. According to the scheme, the concentration of the graphene nanosheets in the formed turbid liquid after re-dispersion is 10-15 wt%.
The invention also provides a preparation method of the magnetic response intelligent optical material based on the graphene nanosheet, which comprises the following steps: the magnetic nanoparticles are deposited on the surfaces of the graphene nano sheets by adopting a liquid phase deposition method, the deposited graphene nano sheets are uniformly dispersed in a liquid medium according to the concentration of 10-15 wt%, and then the formed dispersion liquid is packaged in a gap formed by two parallel glass plates, so that the final intelligent window material with the light transmittance capable of being regulated and controlled by a magnetic field is obtained.
Specifically, the preparation method of the magnetic response intelligent optical material based on the graphene nanosheet comprises the following steps:
1) according to Fe3+/Fe2+(or Ni)2+，Co2+，Zn2+，Mg2+) Weighing 0.8-2.0 g of FeCl according to the molar ratio of 2:13·6H2O and FeCl2·4H2O (or NiCl)2·6H2O、CoCl2·6H2O、ZnCl2、Mg Cl2·6H2O) dissolving the crystalline hydrate in 50ml of deionized water, and carrying out ultrasonic treatment for 20-30 minutes;
2) adding 0.1-0.2 g of nano graphene sheets into the solution, and continuing to perform ultrasonic stirring for about 10-20 minutes until the graphene nano sheets are uniformly dispersed;
3) transferring the solution into a 200ml round-bottom three-neck flask, continuously mechanically stirring (200-400 r/min),
slowly dropping ammonia water with the concentration of 20-28 wt% into the bottle, and adjusting the pH value of the solution to be kept in the range of 7-9. 4) And (3) after continuously reacting for 20-40 minutes, stopping stirring, magnetically separating reaction products in the solution, repeatedly washing to remove surface impurities, and drying at 40-50 ℃ for 4-6 hours to obtain a final product.
5) And D, re-dispersing the product obtained in the step D in a liquid medium under the assistance of ultrasonic waves to form a suspension liquid with the concentration of 10-15 wt%.
6) And packaging the turbid liquid between two parallel glass plates to form the magnetic response intelligent window material.
7) The intelligent window material formed after encapsulation is placed in a magnetic field, the light transmittance of the material is changed through the application and removal of the magnetic field,
a reversible switching of transparent-opaque states is achieved.
According to the scheme, the glass plate used for liquid packaging is one of quartz glass, silicate glass and organic glass (polymethyl methacrylate), the thickness of the glass is 0.5-5 mm, the light transmittance is not lower than 95%, the glass gap is 200 mu m-2 mm, and the glass sealing adopts silicone glass cement.
According to the scheme, the magnetic field intensity used in the magnetic field regulation is 100-1000 gauss, and the magnetic field can be generated by a flat NdFeB magnet or an electrified solenoid.
According to the invention, by utilizing the shape anisotropy of the graphene nanosheets, the magnetic nanoparticles are deposited on the surface of the graphene nanosheets by a liquid-phase deposition method, the light transmittance of the graphene nanosheets is regulated and controlled by controlling the orientation of the graphene nanosheets through a magnetic field, and the graphene nanosheets have the advantages of stable material property, high response speed, non-contact regulation and control and the like; the liquid phase deposition method used for synthesis is environment-friendly, simple and easy to implement, low in cost and suitable for mass production; the magnetic field intensity required for regulating and controlling the optical property of the material is small, the light transmittance of the material is continuously adjustable, the regulating range is large, and the performance is stable.
Drawings
Fig. 1 is a schematic diagram of the working principle of the graphene nanosheet-based magnetic response intelligent optical material of the present invention.
FIG. 2 is a scanning electron microscope of graphene nanoplates after magnetic nanoparticles are deposited in embodiment 1 of the inventionSEM photograph of the micro-mirror. The enlarged area of the figure shows Fe deposited on the surface of the graphene nano-sheet3O4Distribution state of nanoparticles.
Fig. 3 is a transmittance curve of the smart window in the transparent and opaque states in the embodiment 1 of the present invention.
Detailed Description
The present invention will be further described with reference to the following specific examples, but the scope of the present invention is not limited thereto. Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
Referring to fig. 1, the reference numbers in the figure represent the following meanings: 1. graphene nanoplatelets, 2. magnetic nanoparticles. In the working process of the intelligent window, when a magnetic field is not applied, the orientation of the composite graphene nanosheets in the liquid optical interlayer is disordered, so that incident light is strongly scattered, and the material is in an optical opaque state, namely an OFF state; when a direct-current magnetic field is applied along the direction vertical to the glass surface, the graphene nanosheets in the liquid optical interlayer are oriented along the direction vertical to the plane of the glass sheet under the holding of the magnetic particles, so that the scattering area of incident light is sharply reduced, the light transmittance is rapidly increased, and the material is in an optically transparent state, namely an 'ON' state. The two optical states can be reversibly switched repeatedly by application and removal of a magnetic field.
Referring to fig. 2, an enlarged region shows Fe deposited on the surface of graphene nanoplatelets3O4Distribution state of nanoparticles.
Example 1: a preparation method of a magnetic response intelligent optical material based on graphene nanosheets specifically comprises the following steps:
1) according to Fe3+/Fe2+0.8g of FeCl was weighed out in a ratio of 2:13·6H2O、FeCl2·4H2Dissolving the O crystal hydrate in 50ml of deionized water, and carrying out ultrasonic treatment for about 20-30 minutes.
2) Adding 0.2g of commercially available graphene nanosheets into the prepared solution, and ultrasonically stirring for 10 minutes until the graphene nanosheets are uniformly dispersed.
3) The above solution was transferred to a 200ml round-bottom three-necked flask, and while continuing mechanical stirring (300r/min), 28 wt% aqueous ammonia was slowly dropped into the flask to adjust the pH of the solution to 8.
4) After the reaction lasts for 30 minutes, stopping stirring, magnetically separating reaction products in the solution, repeatedly washing to remove surface impurities, and drying at 45 ℃ for 5 hours to obtain the final graphene/Fe3O4And (3) compounding nano sheets.
5) Mixing the graphene/Fe3O4And ultrasonically dispersing the composite nano sheet in deionized water again, maintaining the concentration of the graphene nano sheet in the water to be 12 wt%, and adding 0.5% of polyvinyl alcohol (PVA) into the graphene nano sheet.
6) And (3) sealing the suspension formed by dispersion between two parallel glass (silicate glass) plates by using silicone glass cement, wherein the gap between the two parallel glass plates is 1mm, and thus obtaining the final magnetic response intelligent window.
graphene/Fe3O4The scanning electron micrograph of the composite nanosheet is shown in fig. 2. The enlarged region in the figure shows Fe attached to the surface of the graphene sheet3O4Distribution state of magnetic nanoparticles.
The transmittance curve of the formed intelligent window corresponding to the two states of light transmission and light non-transmission under the action of the magnetic field is shown in fig. 3.
Example 2:
the procedure is as in example 1, only FeCl is required3·6H2O、FeCl2·4H2The amount of O was changed to 2g and the deionized water was changed to ethylene glycol in step 5.
Example 3:
the procedure is as in example 1, only FeCl is required2·4H2Conversion of O to NiCl2·4H2O, changing the clearance of the glass plate to 200 mu m in the step 6.
Example 4:
the steps are the same as those of the embodiment 1, only the graphene nanosheets are replaced by the nano graphene oxide sheets, the glass plate in the step 6 is made of organic glass, and the gap between the glass plates is changed to be 2 mm.
Example 5:
the procedure is as in example 1, only FeCl is required2·4H2Conversion of O to NiCl2·6H2And O, changing the concentration of the graphene nanosheets in water to 10 wt% in the step 5.
Example 6:
the procedure is as in example 1, only FeCl is required2·4H2O is replaced by CoCl2·6H2O, changing the liquid medium into propylene carbonate in the step 5.
Example 7:
the procedure is as in example 1, only FeCl is required2·4H2Conversion of O to ZnCl2And in the step 5, the liquid medium is changed into polyethylene glycol diacrylate PEGDA.
Example 8:
the procedure is as in example 1, only FeCl is required2·4H2Conversion of O to Mg Cl2·6H2O。
And (4) conclusion: as can be seen from the transmittance curve in fig. 3, the transmittance in both the transparent and opaque states can reach 74% and 12%, respectively, representing significant optical switching characteristics. The light transmittance can be adjusted and controlled reversibly by the magnetic field, so that the material has wide application prospect in the fields of optical switches, information encryption, commodity anti-counterfeiting and the like.
The above-mentioned embodiments are merely illustrative of the inventive concept of the present invention, and are not intended to limit the scope of the claims of the present invention.
Claims (7)
1. A magnetic response intelligent optical material based on graphene nanosheets is characterized in that: the material consists of graphene nanosheets, magnetic nanoparticles and a liquid medium, wherein the magnetic nanoparticles are deposited on the surface of graphene by a liquid phase deposition method, and the mass ratio of the graphene nanosheets to the magnetic nanoparticles is controlled to be 0.5: 1-3: 1; and dispersing the graphene nanosheets subjected to magnetic particle deposition in a liquid medium to form a suspension with the concentration of 10-15 wt%.
2. The graphene nanoplatelet-based magnetic-response smart optical material as claimed in claim 1, wherein the graphene nanoplatelets are commercially available graphene nanoplatelets or commercially available graphene oxide nanoplatelets, the shapes of the nanoplatelets are arbitrary polygons, the thickness of the nanoplatelets is not more than 20nm, the size of the nanoplatelets is 5-20 μm, and the nanoplatelets are subjected to ultrasonic dispersion treatment in deionized water before use.
3. The graphene nanoplatelet-based magnetically-responsive smart optical material of claim 1 wherein the magnetic nanoparticles are Fe3O4、NiFe2O4、CoFe2O4、ZnFe2O4、MgFe2O4In one of the above methods, the particles are obtained by chemical coprecipitation, and have spherical shape, particle size of 5-20 nm, and saturation magnetization of not less than 40 emu/g.
4. The graphene nanoplatelet-based magnetically-responsive smart optical material as claimed in claim 1, wherein the liquid medium is any one of water, ethylene glycol EG, propylene carbonate PC, and polyethylene glycol diacrylate PEGDA, and when the liquid medium is water, 0.2-1.0 vol% of polyvinyl alcohol PVA needs to be added therein to increase the viscosity of the liquid properly.
5. The preparation method of the magnetic response intelligent optical material based on the graphene nano-sheets, which is disclosed by claim 1, is characterized by comprising the following steps: the method comprises the following steps of depositing magnetic nanoparticles on the surface of a graphene nanosheet by adopting a liquid phase deposition method, uniformly dispersing the deposited graphene nanosheet in a liquid medium according to the concentration of 10-15 wt%, and then packaging the formed dispersion liquid in a gap formed by two parallel glass plates to obtain the final intelligent window material capable of being regulated and controlled by a magnetic field, wherein the method specifically comprises the following steps:
A) according to Fe3+/Fe2+Or Ni2+，Co2+，Zn2+，Mg2+Weighing 0.8-2.0 g of FeCl according to the molar ratio of 2:13·6H2O and FeCl2·4H2O or NiCl2·6H2O、CoCl2·6H2O、ZnCl2、Mg Cl2·6H2Dissolving the O crystal hydrate in 50ml of deionized water, and carrying out ultrasonic treatment for 20-30 minutes;
B) adding 0.1-0.2 g of nano graphene sheets into the solution, and continuing to perform ultrasonic stirring for about 10-20 minutes until the graphene nano sheets are uniformly dispersed;
C) transferring the solution into a 200ml round-bottom three-neck flask, slowly dripping ammonia water with the concentration of 20-28 wt% into the flask while continuously mechanically stirring for 200-400 r/min, and adjusting the pH value of the solution to keep the pH value in a range of 7-9;
D) after the reaction lasts for 20-40 minutes, stopping stirring, magnetically separating reaction products in the solution, repeatedly washing to remove surface impurities, and drying at 40-50 ℃ for 4-6 hours to obtain a final product;
E) re-dispersing the product obtained in the step D in a liquid medium under the auxiliary action of ultrasonic waves to form a suspension liquid with the concentration of 10-15 wt%;
F) packaging the turbid liquid between two parallel glass plates to form a magnetic response intelligent window material;
G) and placing the intelligent window material formed after packaging in a magnetic field, and changing the light transmittance of the material by applying and removing the magnetic field to realize reversible switching between a transparent state and an opaque state.
6. The preparation method of the magnetic-response intelligent optical material based on the graphene nanosheets as claimed in claim 5, wherein the glass plate used for liquid encapsulation is one of quartz glass, silicate glass and organic glass (polymethyl methacrylate), the light transmittance is not lower than 95%, the glass gap is 200 μm-2 mm, and the glass sealing is made of silicone glass cement.
7. The preparation method of the graphene nanosheet-based magnetic-response intelligent optical material as claimed in claim 5, wherein the magnetic field strength used in magnetic field regulation is 100-1000 gauss, and the magnetic field is generated by a flat NdFeB magnet or an energized solenoid.
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| CN109943075A (en) * | 2019-03-27 | 2019-06-28 | 华南理工大学 | A kind of preparation method of the graphene thermally conductive silicone rubber composite material of magnetic aligning |
| CN110655089A (en) * | 2018-06-29 | 2020-01-07 | 中国地质大学（北京） | Dispersion liquid with adjustable optical property and preparation method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103738942A (en) * | 2013-11-14 | 2014-04-23 | 盐城增材科技有限公司 | Graphene nano-rod preparation method |
| CN110655089A (en) * | 2018-06-29 | 2020-01-07 | 中国地质大学（北京） | Dispersion liquid with adjustable optical property and preparation method thereof |
| CN109336045A (en) * | 2018-09-29 | 2019-02-15 | 湖北大学 | A kind of dynamic quickly regulates and controls the flexible device and its preparation method and application of infrared light transmittance |
| CN109943075A (en) * | 2019-03-27 | 2019-06-28 | 华南理工大学 | A kind of preparation method of the graphene thermally conductive silicone rubber composite material of magnetic aligning |
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Application publication date: 20210706 |