Nanomaterials and magnetic media with coated nanostructured fillers and carriers

• US 6,737,463 B2
• Filed: 05/10/2002
• Issued: 05/18/2004
• Est. Priority Date: 09/03/1996
• Status: Expired due to Term

• Current Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Original Assignee: NanoProducts Corporation (Nouryon BV)
• Inventors: Yadav, Tapesh, Kostelecky, Clayton, Franke, Evan, Miremadi, Bijan, Au, Ming, Vigliotti, Anthony
• Primary Examiner(s): WYROZEBSKI LEE, KATARZYNA I
• Application Number:
  US10/144,013
• Publication Number:
  US 20020188052A1
• Time in Patent Office: 739 Days
• Field of Search: 524/435, 427/127, 427/128, 428/694.SC, 428/694.T, 428/694.B, 428/694.BA, 428/900, 423/335, 423/610
• US Class Current: 524/435
• CPC Class Codes: B01J 12/005 carried out at high temperatures, e.g. by pyrolysis
• CPC Class Codes: B01J 12/02 for obtaining at least one reaction product which, at normal temperature, is in the solid state
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• CPC Class Codes: B01J 2219/00094 Jackets
• CPC Class Codes: B01J 2219/00135 Electric resistance heaters
• CPC Class Codes: B01J 2219/00155 using insulating materials or refractories
• CPC Class Codes: B01J 2219/00177 controlling the pH
• CPC Class Codes: B01J 2219/0018 controlling the conductivity
• CPC Class Codes: B01J 2219/0894 Processes carried out in the presence of a plasma
• CPC Class Codes: B05B 1/12 capable of producing different kinds of discharge, e.g. either jet or spray having selectively-effective outlets B05B1/16
• CPC Class Codes: B22F 1/054 Nanosized particles
• CPC Class Codes: B22F 1/07 Metallic powder characterised by particles having a nanoscale microstructure nanosized particles B22F1/054
• CPC Class Codes: B22F 1/09 Mixtures of metallic powders
• CPC Class Codes: B22F 1/10 Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
• CPC Class Codes: B22F 1/102 Metallic powder coated with organic material
• CPC Class Codes: B22F 1/12 Metallic powder containing non-metallic particles containing lubricating or binding agents or organic material B22F1/10
• CPC Class Codes: B22F 2202/13 Use of plasma
• CPC Class Codes: B22F 2999/00 Aspects linked to processes or compositions used in powder metallurgy
• CPC Class Codes: B22F 9/12 starting from gaseous material
• CPC Class Codes: B29C 70/58 comprising fillers only , e.g. particles, powder, beads, flakes, spheres B29C70/025 takes precedence, agglomerating hollow spheres to produce synthetic foam B29C70/66; compounding ingredients per se C08K
• CPC Class Codes: B82B 1/00 : Nanostructures formed by manipulation of individual atoms or molecules, or limited collections of atoms or molecules as discrete units
• CPC Class Codes: B82Y 20/00 : Nanooptics, e.g. quantum optics or photonic crystals
• CPC Class Codes: B82Y 25/00 : Nanomagnetism, e.g. magnetoimpedance, anisotropic magnetoresistance, giant magnetoresistance or tunneling magnetoresistance
• CPC Class Codes: B82Y 30/00 : Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C01B 13/145 : After-treatment of oxides or hydroxides, e.g. pulverising, drying, decreasing the acidity
• CPC Class Codes: C01B 13/363 : Mixtures of oxides or hydroxides by precipitation
• CPC Class Codes: C01B 19/007 : Tellurides or selenides of metals C01B19/002 takes precedence
• CPC Class Codes: C01B 21/062 : with chromium, molybdenum or tungsten
• CPC Class Codes: C01B 25/08 : Other phosphides
• CPC Class Codes: C01B 32/90 : Carbides
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• CPC Class Codes: C01B 35/04 : Metal borides
• CPC Class Codes: C01F 11/06 : of carbonates
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• CPC Class Codes: C01G 19/00 : Compounds of tin
• CPC Class Codes: C01G 19/006 : Compounds containing, besides tin, two or more other elements, with the exception of oxygen or hydrogen
• CPC Class Codes: C01G 19/02 : Oxides
• CPC Class Codes: C01G 23/006 : Alkaline earth titanates
• CPC Class Codes: C01G 41/02 : Oxides; Hydroxides
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• CPC Class Codes: C01G 49/0063 : containing zinc
• CPC Class Codes: C01G 53/006 : Compounds containing, besides nickel, two or more other elements, with the exception of oxygen or hydrogen nickelates C01G53/40
• CPC Class Codes: C01P 2002/01 : depicted by a TEM-image
• CPC Class Codes: C01P 2002/02 : Amorphous compounds
• CPC Class Codes: C01P 2002/34 : perovskite-type (ABO3)
• CPC Class Codes: C01P 2002/52 : containing elements as dopants
• CPC Class Codes: C01P 2002/54 : one element only
• CPC Class Codes: C01P 2002/60 : Compounds characterised by their crystallite size
• CPC Class Codes: C01P 2002/72 : by d-values or two theta-values, e.g. as X-ray diagram
• CPC Class Codes: C01P 2004/03 : obtained by SEM
• CPC Class Codes: C01P 2004/04 : obtained by TEM, STEM, STM or AFM
• CPC Class Codes: C01P 2004/10 : extending in one dimension, e.g. needle-like
• CPC Class Codes: C01P 2004/16 : Nanowires or nanorods, i.e. solid nanofibres with two nearly equal dimensions between 1-100 nanometer
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• CPC Class Codes: C01P 2004/52 : highly monodisperse size distribution
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• CPC Class Codes: C01P 2004/62 : Submicrometer sized, i.e. from 0.1-1 micrometer
• CPC Class Codes: C01P 2004/64 : Nanometer sized, i.e. from 1-100 nanometer
• CPC Class Codes: C01P 2004/84 : one phase coated with the other
• CPC Class Codes: C01P 2004/86 : Thin layer coatings, i.e. the coating thickness being less than 0.1 time the particle radius
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• CPC Class Codes: C04B 14/38 : Fibrous materials; Whiskers
• CPC Class Codes: C04B 2/10 : Preheating, burning calcining or cooling decarbonation during burning of cement raw materials C04B7/43; obtaining CaO or MgO otherwise than by thermal decomposition of the corresponding carbonates C01F11/02, C01F5/02
• CPC Class Codes: C04B 20/0004 : Microcomposites or nanocomposites, e.g. composite particles obtained by polymerising monomers onto inorganic materials
• CPC Class Codes: C04B 20/008 : Micro- or nanosized fillers, e.g. micronised fillers with particle size smaller than that of the hydraulic binder colloidal silica C04B14/062 ; silica fume C04B18/146
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• CPC Class Codes: C04B 2111/00008 : Obtaining or using nanotechnology related materials
• CPC Class Codes: C04B 2111/00482 : Coating or impregnation materials
• CPC Class Codes: C04B 2111/00844 : for electronic applications
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• CPC Class Codes: C04B 2235/3262 : Manganese oxides, manganates, rhenium oxides or oxide-forming salts thereof, e.g. MnO
• CPC Class Codes: C04B 2235/3275 : Cobalt oxides, cobaltates or cobaltites or oxide forming salts thereof, e.g. bismuth cobaltate, zinc cobaltite
• CPC Class Codes: C04B 2235/3279 : Nickel oxides, nickalates, or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3284 : Zinc oxides, zincates, cadmium oxides, cadmiates, mercury oxides, mercurates or oxide forming salts thereof
• CPC Class Codes: C04B 2235/3286 : Gallium oxides, gallates, indium oxides, indates, thallium oxides, thallates or oxide forming salts thereof, e.g. zinc gallate
• CPC Class Codes: C04B 2235/3298 : Bismuth oxides, bismuthates or oxide forming salts thereof, e.g. zinc bismuthate
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• CPC Class Codes: C04B 2235/444 : Halide containing anions, e.g. bromide, iodate, chlorite
• CPC Class Codes: C04B 2235/5409 : expressed by specific surface values
• CPC Class Codes: C04B 2235/5454 : nanometer sized, i.e. below 100 nm
• CPC Class Codes: C04B 2235/549 : the particle size being expressed by crystallite size or primary particle size
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• CPC Class Codes: C04B 2235/6565 : Cooling rate
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• CPC Class Codes: C04B 26/02 : Macromolecular compounds
• CPC Class Codes: C04B 26/06 : Acrylates
• CPC Class Codes: C04B 35/01 : based on oxide ceramics
• CPC Class Codes: C04B 35/10 : based on aluminium oxide
• CPC Class Codes: C04B 35/265 : Compositions containing one or more ferrites of the group comprising manganese or zinc and one or more ferrites of the group comprising nickel, copper or cobalt
• CPC Class Codes: C04B 35/453 : based on zinc, tin, or bismuth oxides or solid solutions thereof with other oxides, e.g. zincates, stannates or bismuthates
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• CPC Class Codes: C04B 35/547 : based on sulfides or selenides or tellurides
• CPC Class Codes: C04B 35/62222 : obtaining ceramic coatings coating of mortars, concrete, artificial or natural stone or ceramics C04B41/45; laminated ceramic products B32B18/00; coating metallic materials C23; coating of glass C03C17/00, applying ceramic coatings on silicon for semi-conductor purposes H01L
• CPC Class Codes: C04B 35/6265 : involving reduction or oxidation
• CPC Class Codes: C04B 35/628 : Coating the powders or the macroscopic reinforcing agents
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• CPC Class Codes: C04B 35/653 : Processes involving a melting step
• CPC Class Codes: C04B 41/009 : characterised by the material treated
• CPC Class Codes: C04B 41/4539 : as a emulsion, dispersion or suspension
• CPC Class Codes: C04B 41/4549 : Nanometer-sized particles
• CPC Class Codes: C04B 41/5027 : Oxide ceramics in general; Specific oxide ceramics not covered by C04B41/5029 - C04B41/5051
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• CPC Class Codes: C04B 41/5122 : Pd or Pt
• CPC Class Codes: C04B 41/52 : Multiple coating or impregnating multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation
• CPC Class Codes: C04B 41/89 : for obtaining at least two superposed coatings having different compositions
• CPC Class Codes: C04B 41/90 : at least one coating being a metal
• CPC Class Codes: C08K 2201/011 : Nanostructured additives
• CPC Class Codes: C08K 3/01 : characterized by their specific function
• CPC Class Codes: C08K 3/013 : Fillers, pigments or reinforcing additives
• CPC Class Codes: C08K 3/08 : Metals
• CPC Class Codes: C08K 9/02 : Ingredients treated with inorganic substances
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• CPC Class Codes: C09C 1/0081 : Composite particulate pigments or fillers, i.e. containing at least two solid phases, except those consisting of coated particles of one compound C09C1/0015, C09C1/0078 take precedence
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• CPC Class Codes: H01F 1/344 : Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4
• CPC Class Codes: H01F 1/36 : in the form of particles H01F1/346, H01F1/348 and H01F1/38 take precedence
• CPC Class Codes: H01G 4/12 : Ceramic dielectrics H01G4/085 takes precedence
• CPC Class Codes: H01G 4/33 : Thin- or thick-film capacitors thin- or thick-film circuits H01L27/00; capacitors without a potential-jump or surface barrier specially adapted for integrated circuits, details thereof, multistep manufacturing processes therefor H01L28/40
• CPC Class Codes: H01M 2004/021 : Physical characteristics, e.g. porosity, surface area
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• CPC Class Codes: H01M 6/36 : containing electrolyte and made operational by physical means, e.g. thermal cells
• CPC Class Codes: H01M 8/1213 : characterised by the electrode/electrolyte combination or the supporting material
• CPC Class Codes: H01M 8/1246 : the electrolyte consisting of oxides
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• CPC Class Codes: Y10T 428/31663 : As siloxane, silicone or silane

Abstract

Coated nanoparticles are used for composites and media. Exemplary applications include magnetic applications involving a solid matrix material and a nanostructured magnetic material.

Claims

1. A magnetic composite material comprising:

a solid matrix material; and

a coated nanostructured barium ferrite filler.

2. The magnetic composite of claim 1 wherein the solid matrix comprises a ceramic.

3. The magnetic composite of claim 1 wherein the solid matrix comprises a polymer.

4. The magnetic composite of claim 1 wherein the filler is in the form of a whisker.

5. The magnetic composite of claim 1 wherein the filler is in the form of a plate.

6. The magnetic composite of claim 1 wherein the filler is in the form of a film.

7. A magnetic tape prepared from the magnetic composite material of claim 1.

8. The magnetic composite of claim 1 wherein the composite material comprises a combination of more than one filler composition.

9. A magnetic tape comprising:

a support having thereon a magnetic layer comprising a coated ferromagnetic powder dispersed in a filler, wherein the average grain size of the ferromagnetic powder is 100 nanometers or less.

10. The magnetic tape of claim 9 wherein the thickness of the magnetic layer is from 1 nanometer to 1000 nanometer.

11. The magnetic tape of claim 9 wherein the ferromagnetic powder comprises barium ferrite.