Process for forming nanoparticles

Details Process for forming nanoparticles Process for forming nanoparticles

1996-06-05

1998-07-21

Pianalto, Bernard

Coating processes

Direct application of electrical, magnetic, wave, or...

Electrical discharge

427216, 427598, H01T 1400

Patent

active

057832633

ABSTRACT:
A metal or alloy nanoparticle is provided which exhibits hysteresis at room temperature having a carbon coating. The nanoparticle has a diameter in the range of approximately 0.5 to 50 nm, and may be crystalline or amorphous. The metal, alloy, or metal carbide nanoparticle is formed by preparing graphite rods which are packed with the magnetic metal or alloy or an oxide of the metal or alloy. The packed graphite rods are subjected to a carbon arc discharge to produce soot containing metal, alloy, or metal carbide nanoparticles and non-magnetic species. The soot is subsequently subjected to a magnetic field gradient to separate the metal, alloy, or metal carbide nanoparticles from the non-magnetic species.

REFERENCES:
patent: 3661567 (1972-05-01), Yamamoto
patent: 3976519 (1976-08-01), Kubo et al.
patent: 4042429 (1977-08-01), Kojima et al.
patent: 4043845 (1977-08-01), Dionne
patent: 4133703 (1979-01-01), Kojima et al.
patent: 4187170 (1980-02-01), Westcott et al.
patent: 5049540 (1991-09-01), Park et al.
patent: 5127586 (1992-07-01), Oder
patent: 5176260 (1993-01-01), Oder
patent: 5248498 (1993-09-01), Neumann et al.
patent: 5304366 (1994-04-01), Lorents et al.
patent: 5456986 (1995-10-01), Majetich et al.
patent: 5548748 (1996-08-01), Ruoff et al.
Rodney S. Ruoff, Donald C. Lorents, Bryan Chan, Ripudaman Malhotra, Shekhar Subramoney; Single Crystal Metals Encapsulated in Carbon Nanoparticles; Science, vol. 259, Jan. 15, 1993, pp. 346-348.
Masato Tomita, Yanachi Saito and Takayoshi Hayashi ; LaC.sub.2 Encapsulated in Graphite Nano-Particle; Jpn. J Appl. Phys. vol. 32 (1993), pp. L280-L282; Part 2, No. 2B, Feb. 15, 1993.
B. Diggs, A. Zhou, C. Silva, S. Kirkpatrick, N. T. Nuhfer, M. E. McHenry, D. Petasis, S. A. Majetich, B. Brunett, J. O. Artman and S. W. Staley; Magnetic Properties of Carbon-Coated Rare-Earth Carbide Nanocrystallites Produced by a Carbon Arc Method; J. Appl. Phys. 75(10), May 15, 1994, 1994 American Institute of Physics, pp. 5879-5884.
E. M. Brunsman, R. Sutton, E. Bortz, S. Kirkpatrick, K. Midelfort, J. Williams, P. Smith, M. E. McHenry, S. A. Majetich, J. O. Artman, M. DeGraef and S. W. Staley; Magnetic Properties of Carbon-Coated, Ferromagnetic Nanoparticles Produced by a Carbon-Arc Method; J. Appl. Phys. 75(10), May 15, 1994, 1994 American Institute of Physics, pp. 5882-5884.
M. E. McHenry, S. A. Majetich, J. O. Artman, M. DeGraef and S. W. Staley; Superparamagnetism in Carbon-Coated Co Particles Produced by the Kratschmer Carbon Arc Process; 1994 The American Physical Society, vol. 49, No. 16, pp. 11 358-11 363, ( no month avail.).
J. Svoboda; Magnetic Methods for the Treatment of Minerals; Elsevier Science Publishers B. V. (Amsterdam, The Netherlands); Distributors for the United States and Canada: Elsevier Science Publishing Company, Inc. (New York, NY); Elsevier Science Publishers B. V., 1987; ISBN 0-444-42811-9 (vol. 8), ISBN 0-444-41804-0 (Series), pp. 3, 4, (no date avail.).
MM. Merrill E. Jordan, Harvey M. Cole, William C. Burbine and David L. Petterson; Pigments Noirs Carbones Magnetiques Ameliores Et ProcedeDe Production Perfectionne De Ces Pigments; Brevet D'Invention; Bulletin officiel de la Propriete industrielle, n.degree. 15 de 1964, pp. 1-6, (no month avail.).
P. Byszewski, R. Diduszko and M. Baran; Weak Ferromagnetism of Fe Intercalated Fullerides; vol. 85 (1994) ACTA Physica Polonica A, No. 2, pp. 297-302, ( no month avail.).
P. M. Ajayan, T. W. Ebbesen, T. Ichihashi, S. Iijima, K. Tanigaki and H. Hiura; Opening Carbon Nanotubes with Oxygen and Implications for Filling; Nature, vol. 362, Apr. 8, 1993, pp. 522-525.
C. Guerret-Piecourt, Y. LeBouar, A. Loiseau and H. Pascard; Relation Between Metal Electronic Structure and Morphology of Metal Compounds Inside Carbon Nanotubes; Nature, vol. 372, 22/29 Dec., 1994, pp. 761-765.
Supapan Seraphin, Dan Zhou, Jun Jlao, James C. Withers, Rauof Loutfy; Yttrium Carbide in Nanotubes; Nature, vol. 362, Apr. 8, 1993, p. 503.
S. A. Majetich, J. O. Artman, M. E. McHenry and N. T. Nuhfer, S. W. Staley; Preparation and Properties of Carbon-Coated Magnetic Nanocrystallites; 1993 The American Physical Society, vol. 48, No. 22, pp. 16-845-16 848.
I. S. Jacobs and C. P. Bean (General Electric Research Laboratory); Fine Particles, Thin Films and Exchange Anisotropy (Effects of Finite Dimensions and Interfaces on the Basic Properties of Ferromagnets); pp. 271-350 (No date avail.).
Ami E. Berkowitz and Eckart Kneller; Magnetism and Metallurgy; Academic Press, vol. 1, 1969, pp. 365-471, (No month avail.).
Electronic Structure of Metals Affects Ability to Fill Nanotubes; Science/Technology Concentrates, Chemical and Engineering News, Jan. 2, 1995 p. 20.
X. Guo, X. Chen, Z. Altounian, J. O. Strom-Olsen, Phys. Rev. B, 46, 14578 (1992) (No month avail.).

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