Integrated thermal process for the continuous synthesis of nanos

Details Integrated thermal process for the continuous synthesis of nanos Integrated thermal process for the continuous synthesis of nanos

1996-09-03

1998-12-22

Langel, Wayne

Chemistry of inorganic compounds

Miscellaneous process

75343, 75351, 423289, 423345, 423409, 423412, 423439, 423440, 423592, 423606, B22F 900, C01B 21072, C01B 1314, C01B 2130

Patent

active

058515070

ABSTRACT:
A continuous process that produces nanoscale powders from different types of precursor material by evaporating the material and quenching the vaporized phase in a converging-diverging expansion nozzle. The precursor material suspended in a carrier gas is continuously vaporized in a thermal reaction chamber under conditions that favor nucleation of the resulting vapor. Immediately after the initial nucleation stages, the vapor stream is rapidly and uniformly quenched at rates of at least 1,000 K/sec, preferably above 1,000,000 K/sec, to block the continued growth of the nucleated particles and produce a nanosize powder suspension of narrow particle-size distribution. The nanopowder is then harvested by filtration from the quenched vapor stream and the carrier medium is purified, compressed and recycled for mixing with new precursor material in the feed stream.

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