| US 7,524,481 B2 | ||
| Reactors for producing inorganic fullerene-like tungsten disulfide hollow nanoparticles and nanotubes | ||
| Reshef Tenne, Rehovot (Israel); Yishay Feldman, Ashdod (Israel); Alla Zak, Rehovot (Israel); and Rita Rosentsveig, Rehovot (Israel) | ||
| Assigned to Yeda Research and Development Co., Ltd., Rehovot (Israel) | ||
| Appl. No. 10/220,688 PCT Filed Mar. 06, 2001, PCT No. PCT/IL01/00211 § 371(c)(1), (2), (4) Date May 22, 2003, PCT Pub. No. WO01/66462, PCT Pub. Date Sep. 13, 2001. |
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| Claims priority of application No. 134891 (IL), filed on Mar. 06, 2000. | ||
| Prior Publication US 2004/0105808 A1, Jun. 03, 2004 | ||
| Int. Cl. H01M 4/58 (2006.01) | ||
| U.S. Cl. 423—561.1 [977/700; 427/255.28; 118/724; 118/723 VE; 422/143; 422/145; 422/146; 422/193; 422/199; 422/232; 422/240] | 13 Claims |
| 1. A synthetic method of production of WS2 fullerene-like nanoparticles and nanostructures from WO3 metal oxide powder and H2 and H2S reacting gases, said method comprising the steps of:
(i) feeding a first mixture of a reacting tungsten oxide powder and an inert gas with a predetermined feeding rate downwardly
into the top of a vertical flow line extending into the inside of a vertical chemical reactor such that a lower end of the
vertical flow line is located inside the vertical chemical reactor, and providing a flow of a mixture of the H2 and H2S reacting gases along said vertical chemical reactor, so as to allow interaction of the flowing tungsten oxide powder and
the reacting gases in a reaction path located in the vertical chemical reactor;
(ii) controlling temperature inside the chemical reactor so as to provide a predetermined temperature profile along the reaction
path; and
(iii) collecting the formed WS2 nanostructures at a bottom portion of the vertical reactor,
the method thereby providing a solid-gas reaction between the reacting gases and the tungsten oxide powder during the flow
through and along the reaction path, resulting in the formation of WO3-x, clusters coated by at least one layer of WS2, and further exchange of oxides by sulfides in inner parts of the clusters, thereby causing formation of WS2 nanostructures.
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