| In this paper, has established a supercritical fluid experimental device with advantages as system of simplicity, convenient operation, wide range of applications and reliability of processing, and investigated the preparation of nanoparticles by combining reverse micelle method and gas anti-solvent technique (GAS) based on the theories and experiments. The details are as follows:Firstly, technique and structural design of the autoclave and the sample pool as important equipments of GAS is accomplished. Water bath incubator is welded to a 200ml volume autoclave by the connection of four-way valve with "loop" recycling pattern with the temperature controlling sample pool with volume of 4.5ml. This device doesn't only solve the delay during off-line detection for nanoparticles through ultraviolet-visible spectrum but also avoid vast waste of materials during the detection.Secondly, silver particles which the average particle size is of 4.9nm and 8.3nm through the reaction by NaBH4 and AgNO3 in the system consists of SDS/isooctane/ butanol/water composition are recycled by the ways of CO2 anti-solvent technology. The effects of Wo value of the microemulsion, the concentration of reactants, mole ratio of reducing agent to oxidant and the pressure of CO2 to the particles'size and the distributions of the size are studied and the growth mechanism of inorganic nanoparticles atomic nucleus is analyzed.A valuable new way of industrial production of nanoparticles will be provided duo to the success of the preparation of nano silver particles by the method of microemulsion-CO2 anti-solvent technology. Meanwhile, it is also available to apply this method to the fields of preparations and recycling of varieties of organic, inorganic and even the heat-sensitive explosives.
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