GB974627A - Dispersions of ferromagnetic metals - Google Patents

Dispersions of ferromagnetic metals

Info

Publication number
GB974627A
GB974627A GB32391/61A GB3239161A GB974627A GB 974627 A GB974627 A GB 974627A GB 32391/61 A GB32391/61 A GB 32391/61A GB 3239161 A GB3239161 A GB 3239161A GB 974627 A GB974627 A GB 974627A
Authority
GB
United Kingdom
Prior art keywords
copolymer
dispersion
weight
methyl methacrylate
dispersions
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.)
Expired
Application number
GB32391/61A
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.)
California Research LLC
Original Assignee
California Research LLC
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
Application filed by California Research LLC filed Critical California Research LLC
Publication of GB974627A publication Critical patent/GB974627A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/16—Making metallic powder or suspensions thereof using chemical processes
    • B22F9/30—Making metallic powder or suspensions thereof using chemical processes with decomposition of metal compounds, e.g. by pyrolysis
    • 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
    • B22F1/05—Metallic powder characterised by the size or surface area of the particles
    • B22F1/054—Nanosized particles
    • B22F1/0545—Dispersions or suspensions of nanosized 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
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/16—Making metallic powder or suspensions thereof using chemical processes
    • B22F9/30—Making metallic powder or suspensions thereof using chemical processes with decomposition of metal compounds, e.g. by pyrolysis
    • B22F9/305—Making metallic powder or suspensions thereof using chemical processes with decomposition of metal compounds, e.g. by pyrolysis of metal carbonyls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y25/00—Nanomagnetism, e.g. magnetoimpedance, anisotropic magnetoresistance, giant magnetoresistance or tunneling magnetoresistance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/0036—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties showing low dimensional magnetism, i.e. spin rearrangements due to a restriction of dimensions, e.g. showing giant magnetoresistivity
    • H01F1/0045—Zero dimensional, e.g. nanoparticles, soft nanoparticles for medical/biological use
    • H01F1/0063—Zero dimensional, e.g. nanoparticles, soft nanoparticles for medical/biological use in a non-magnetic matrix, e.g. granular solids
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Nanotechnology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Composite Materials (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Hard Magnetic Materials (AREA)
  • Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)

Abstract

A dispersion comprises 1 to 95% by weight of discrete particles of iron, cobalt and nickel having substantially uniform diameters in the range of from 10 to 1000 <\>rA units and 99 to 5% by weight of a dispering medium comprising one or more copolymers of monomers containing a single polymerizable group, or a solution of said copolymer(s) in a solvent having an acid dissociation constant less than 10-20, said copolymer(s) having a molecular weight of at least 20,000 and having a carbon and hydrogen content of from 60 to 100%, the metal particles being encapsulated by said dispersing medium. The dispersions are made by decomposing compounds of the metals in the polymer dispersion and, if necessary, concentrating the dispersion. The polymer exemplified is a copolymer of methyl methacrylate and polyethyleneglycol (1800) methyl methacrylate.ALSO:A dispersion comprises 1 to 95% by weight of discrete particles of iron, cobalt and nickel having substantially uniform diameters in the range of from 10 to 1,000 <\>rA units and 99 to 5% by weight of a dispersing medium comprising one or more copolymers of monomers containing a single polymerizable group, or a solution of said copolymer(s) in a solvent having an acid dissociation constant less than 10-20, said copolymer(s) having a molecular weight of at least 20,000 and having a carbon and hydrogen content of from 60 to 100%, the metal particles being encapsulated by said dispersing medium. The dispersions are made by decomposing compounds of the metals in the polymer dispersion and, if necessary, concentrating the dispersion. The polymer exemplified is a copolymer of methyl methacrylate and polyethylene-glycol (1800) methyl methacrylate.
GB32391/61A 1960-09-13 1961-09-08 Dispersions of ferromagnetic metals Expired GB974627A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US5570560A 1960-09-13 1960-09-13

Publications (1)

Publication Number Publication Date
GB974627A true GB974627A (en) 1964-11-11

Family

ID=21999628

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32391/61A Expired GB974627A (en) 1960-09-13 1961-09-08 Dispersions of ferromagnetic metals

Country Status (1)

Country Link
GB (1) GB974627A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3531413A (en) * 1967-09-22 1970-09-29 Avco Corp Method of substituting one ferrofluid solvent for another
EP0035633A1 (en) * 1980-03-10 1981-09-16 International Business Machines Corporation Method of coating magnetic particles
EP0074410A1 (en) * 1981-03-19 1983-03-23 Sony Corporation Magnetic recording medium
US4388376A (en) * 1979-06-25 1983-06-14 Tdk Electronics Co., Ltd. Magnetic recording medium
US4454282A (en) * 1983-03-21 1984-06-12 International Business Machines Corporation Water-based chromium dioxide magnetic recording media
WO2002053315A2 (en) * 2001-01-08 2002-07-11 Inco Limited Production of a liquid dispersion of submicron sized metal particles

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3531413A (en) * 1967-09-22 1970-09-29 Avco Corp Method of substituting one ferrofluid solvent for another
US4388376A (en) * 1979-06-25 1983-06-14 Tdk Electronics Co., Ltd. Magnetic recording medium
EP0035633A1 (en) * 1980-03-10 1981-09-16 International Business Machines Corporation Method of coating magnetic particles
EP0074410A1 (en) * 1981-03-19 1983-03-23 Sony Corporation Magnetic recording medium
EP0074410A4 (en) * 1981-03-19 1985-02-28 Sony Corp Magnetic recording medium.
US4454282A (en) * 1983-03-21 1984-06-12 International Business Machines Corporation Water-based chromium dioxide magnetic recording media
WO2002053315A2 (en) * 2001-01-08 2002-07-11 Inco Limited Production of a liquid dispersion of submicron sized metal particles
WO2002053315A3 (en) * 2001-01-08 2002-09-06 Inco Ltd Production of a liquid dispersion of submicron sized metal particles
US6506229B2 (en) 2001-01-08 2003-01-14 Inco Limited Two experimental trials using the system 10 demonstrate the efficacy of the present process:
AU2001295323B8 (en) * 2001-01-08 2010-03-25 Inco Limited Method for producing a liquid dispersion substantially containing submicron sized metal particles

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