Process for preparing magnetic graphitic materials, and...

Details Process for preparing magnetic graphitic materials, and... Process for preparing magnetic graphitic materials, and...

2005-06-15

2011-12-13

McCracken, Daniel C. (Department: 1736)

Compositions

Magnetic

C423S448000, C423S460000

Reexamination Certificate

active

08075793

ABSTRACT:
A process of preparing magnetic graphitic materials from graphite in a second container (3) that reacts with one of more transition metal oxide and in a first container (2) at a volume ratio of 1:1, in a closed reactor (1), heated up to a temperature between 600° C. and the melting temperature of the transition oxide (s) for 6 to 36 hours, under a pressure of 10 atmospheres with the help of a transfer inert gas through an inlet (5) and vacuum between 10−2torr to 10−7torr through an outlet (6), obtaining at the end of the process a graphitic material with long-lasting magnetic properties at room temperature. The material obtained exhibits a complex structure, with pores, bunches, pilings and edges of exposed graphenes and finds application in nanotechnology, magnetic images in medical science, applications in communication, electronics, sensors, even biosensors, catalysis or separation of magnetic materials.

REFERENCES:
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Kajii, et al., Electronic energy state of a periodic porous nanoscale graphite, J. Phys. D: Appl. Phys. 2000; 33: 3146-3151.
Mombrú et al., “Multilevel ferromagnetic behavior of room-temperature bulk magnetic graphite,”Physical Review, vol. 71, No. 10, Mar. 1, 2005; pp. 100404-1-100404-4.
Esquinazi et al., “Magnetic carbon: explicit evidence of ferromagnetism induced by proton irradiation”,Carbon Elsevier UK, vol. 42, No. 7; Feb. 10, 2004; pp. 1213-1217.
Takai et al., “Structure and electronic properties of a nongraphitic disordered carbon system and its heat-treatment effects,”Physical Review B, vol. 67, No. 21; Jun. 1, 2003; pp. 214202-1-214202-11.
Kopelevich et al., “Ferromagnetic- and Superconducting-Like Behavior of Graphite,”Journal of Low Temperature Physics, vol. 119, No. 5-6, Jun. 2000, pp. 691-702.
Search Report and Written Opinion for PCT/BR2005/000110 dated Aug. 24, 2005.

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