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Synthesis of Silica Nanosize Particles by a Reverse Micelle and Sol―Gel Process
Synthesis of Silica Nanosize Particles by a Reverse Micelle and Sol―Gel Process
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机译：反向胶束-溶胶-凝胶法合成二氧化硅纳米粒子
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摘要
PURPOSE: A method for synthesizing nanosized SiO2 particles with a particle size distribution of 10 to 75 nm by reverse micelle and sol-gel process is provided. CONSTITUTION: The method for synthesizing nanosized SiO2 particles includes the steps of adding (a) one or more surfactants selected from polyoxyethlene nonylphenyl ether and sodium bis(2-ethylhexyl) sulfonate and (b) one or more organic solvents selected from cyclohexane and isooctane into water to prepare an organic solution; reacting the organic solution with tetraethoxysilane (TEOS) in the presence of NH4OH for the promotion of hydrolysis and condensation so that nanosized SiO2 particles are obtained; and rinsing the nanosized SiO2 particles with at least one solvents selected from the group consisting of ethanol, acetone, isopropanol, methanol, toluene and methoxy ethanol. In the above reaction, mole ratio of water/surfactant is 2 to 50, water/TEOS is 5 to 400 and NH4OH/TEOS is 0.1 to 5.
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