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Surface modified silica nanoparticles were prepared through two-step sol-gel process. The introduction of phenyl group onto the surface of silica nanoparticles could be processed by varying the amounts of NH4OH and phenyl trimethoxysilane (PTMS) and molar ratio of H2O/Si during the second step. Under the optimized condition, the surface properties of silica nanoparticles were completely different...
Micrometer-sized hollow silica particles were synthesized by sol-gel reaction in water-in-oil emulsion. To obtain hollow structures in silica particles, the viscosity of water droplets in W/O emulsion was controlled with polyethylene glycol (PEG) or polyvinylpyrrolidone (PVP). To stabilize the emulsion structure, hydroxypropyl cellulose (HPC) was added to the oil phase. Without HPC, the particles...
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