Progress in coating ultrafine particles using chemical vapor deposition in fluidized bed reactors

摘要

Ultrafine particle (UFP) materials with various specialized functions have attracted much attention recently. UFP with sizes ranging between objects and micro-particles (e.g. atom) not only deepen our understanding of nature, but also serve as the basis for the development of new advanced technology. They will be an accent for the next round of scientific and technological development and initiate a new industrial revolution in the near future. But the application of UFP often depends upon the surface modification technology, a technology to change the structure and contents of particle surface physically or chemically. Surface modification can not only improve the inherent characteristics of UFP, but also serve to prepare composite materials inexistent in nature. It can bestow on UFP many extraordinary properties, e.g. optical, magnetic, electric and catalytic property, as well as flowability and workability. Sometimes surface modification can reduce the consumation of expensive master particles thus lowering ' the production cost.