1. A method of making a metalmetal oxide nanoparticle dispersed graphene nanocomposite, the method comprising:
providing a substantially solid metal salt-graphite oxide composite; and
exposing the metal salt-graphite oxide composite to intensified electromagnetic radiation to form the metalmetal oxide nanoparticles dispersed graphene nanocomposite by reducing the metal salt to a metal or metal oxide and the graphite oxide to graphene.
2. The method of claim 1, wherein the electromagnetic radiation is selected from visible light, sunlight, simulated sunlight, a combination thereof, a selected portion thereof, or a combination of selected portions thereof intensified to suitable power.
3. The method of claim 1, wherein the intensified electromagnetic radiation provides about 0.65 Wcm2-1.95 Wcm2.
4. The method of claim 1, wherein the intensified electromagnetic radiation causes a temperature increase to about 300\xb0 C. to about 400\xb0 C.
5. The method of claim 1, wherein, prior to the exposing step, the intensified electromagnetic radiation is provided by at least one of:
a) passing electromagnetic radiation through at least one refractile material;
b) passing the electromagnetic radiation through at least one converging lens; and
c) reflecting the electromagnetic radiation off of one or more converging mirrors.
6. The method of claim 1 wherein the exposing step is performed for no more than about 10 minutes per 100 mg of metal salt-graphite oxide composite.
7. The method of claim 1, wherein the metal salt-graphite oxide composite comprises a metal salt selected from iron salts, copper salts, nickel salts, gold salts, silver salts, platinum salts, palladium salts, cobalt salts, zinc salts, cerium salts and ruthenium salts, and combinations thereof.
8. The method of claim 1 wherein the metal salt-graphite oxide composite comprises a metal salt selected from halide salts, sulphate salts, acetate salts, and nitrate salts of iron, copper, nickel, gold, silver, platinum, palladium, cobalt, ruthenium and combinations thereof.
9. The method of claim 1, wherein the metal salt-graphite oxide composite comprises a metal salt selected from FeCl2, CuCl2, CoCl2, NiCl2, AgCl, HAuCl2, HAuCl4, AgNO3, H2PtCl6, H2PdCl4, RuCl2, Co(NO3)2, AgC2H3O2, CuSO4, FeSO4, SnCl2, ZnCl2, (NH4)2Ce(NO3)6, CrCl3, metal acetates and combinations thereof.
10. The method of claim 1, wherein the intensified electromagnetic radiation reduces the metal salt to a metal or metal oxide and the graphite oxide to graphene.
11. The method of claim 1, wherein the metal salt-graphite oxide composite comprises a metal salt selected from AgCl, HAuCl4, HAuCl2, HAuCl4, AgNO3, H2PtCl6, H2PdCl4, RuCl2, SnCl2, ZnCl2, (NH4)2Ce(NO3)6, CrCl3, and metal acetates, which is reduced to a corresponding metal selected from Ag, Au, Pt, Pd, Ru, Sn, Ce and Cr.
12. The method of claim 1, wherein the metal salt-graphite oxide composite comprises a metal salt selected from FeCl2, CuCl2, CoCl2 NiCl2, SnCl2, ZnCl2, (NH4)2Ce(NO3)6, and CrCl3, which is reduced to a corresponding metal oxide selected from Fe2O3, CuO, CoO, NiO, SnO2, ZnO, CeO2, and CrO2.
13. The method of claim 1, wherein the substantially solid metal salt graphite oxide composite is prepared by:
dispersing graphite oxide in a solvent to form a dispersion;
adding a metal salt to the dispersion; and
drying the resultant material to yield a substantially solid metal salt-graphite oxide composite.
14. The method of claim 13, wherein dispersing the graphite oxide in a solvent further comprises dispersing the graphite oxide in the solvent by ultrasonication.
15. The method of claim 13, wherein the solvent comprises water.
16. The method of claim 1, wherein the metal salt and graphite oxide are reduced simultaneously.
17. A nanocomposite comprising:
a graphene sheet; and
a plurality of nanoparticles of at least one metal or metal oxide dispersed on the graphene sheet.
18. The nanocomposite of claim 17, wherein the at least one metal or metal oxide is selected from Fe2O3, CuO, NiO, Au, Ag, Pt, Pd, Co, Ru, CoO, RuO2, SnO2, ZnO, CeO2, CrO2, and combinations thereof.
19. The nanocomposite of claim 17, wherein the graphene sheet defines two sides, and the nanoparticles of the at least one metal or metal oxide are dispersed substantially evenly on both the two sides of the graphene sheet.
20. The nanocomposite of claim 17, wherein the composition comprises a plurality of graphene sheets, each of which contains dispersed nanoparticles of at least one metal or metal oxide.
21. The nanocomposite of claim 17 wherein the plurality of nanoparticles are non-magnetic nanoparticles, magnetic nanoparticles or combinations of thereof.
22. The nanocomposite of claim 17, where the graphene sheet is coated with 10-15 nm Ag nanoparticles distributed in a face centered cubic structure of Ag.
23. The composition of claim 17, graphene sheets are coated with about 12-18 nm Au nanoparticles with face centered cubic structure.
24. The nanocomposite of claim 17, where the graphene sheet is coated with about 12-20 nm CuO nanoparticles, about 9-18 nm NiO nanoparticles, about 34-50 nm magnetic Fe2O3 nanoparticles, or combinations thereof.
25. The graphene nanocomposite of claim 17, wherein the nanocomposite comprises less than 2 at. % chlorine.
26. The nanocomposite of claim 17, wherein the nanoparticles are metals, and the oxygen content in the nanocomposite is less than about 7 at. %.
27. The nanocomposite of claim 17, wherein the nanoparticles are metal oxides, and the oxygen content in the nanocomposite is less than about 15 at. %.
28. The method of claim 4, wherein the temperature increase is at a rate of about 75\xb0 C. per second to about 200\xb0 C. per second.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An electric motor, comprising:
an electric motor shaft;
a rotor which rotates about the electric motor shaft;
a stator disposed in an outer periphery of the rotor;
a housing which houses the rotor and the electric motor shaft;
a sealing body formed in the housing, the sealing body being formed of sealant made of synthetic resin material having a heat conductive property and electrical insulation property, the sealant having been injected so as to cover at least a coil end of the stator;
a temperature sensitive device disposed in the housing and configured to be operated in response to temperature;
an end cover to be mounted on an axial end of the housing; and
a retaining member having elasticity, wherein:
the electric motor shaft is disposed to pass through the end cover;
the sealing body has surfaces including a temperature-sensitive-device support surface opposed to the end cover; and
the temperature sensitive device is retained between the end cover and the temperature-sensitive-device support surface in a state that the retaining member is interposed between the temperature sensitive device and the end cover.
2. The electric motor according to claim 1, wherein: the temperature sensitive device is a temperature measuring device; the sealing body has a surface formed with a recess portion, the surface being a surface covering a radial inner surface of the coil end; and the recess portion includes a surface which is opposed to the end cover and forms the temperature-sensitive-device support surface.
3. The electric motor according to claim 2, wherein the recess portion is formed only in a circumferential part of the sealing body.
4. The electric motor according to claim 2, wherein the end cover has an inner surface including a center portion formed with a projection portion projecting axially inward of the end cover beyond a portion of the inner surface of the end cover other than the projection portion, the projection portion being opposed to the recess portion with a gap radially of the electric motor, and the retaining member is retained between the temperature sensitive device and the end cover so as to bridge the gap.
5. The electric motor according to claim 1, wherein the temperature sensitive device is a temperature measuring device, and the retaining member is formed of a material having a property of making heat conduction between the temperature sensitive device and the end cover be smaller than heat conduction between the sealing body and the temperature sensitive device.
6. The electric motor according to claim 1, wherein the retaining member and the temperature sensitive device are adhered to each other to be integral with each other.
7. The electric motor according to claim 1, wherein a conductive wire is connected to the temperature sensitive device, and a space portion devoid of the sealing body is formed between the coil end and the housing, the conductive wire being disposed in the space portion.