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Title: Preparation of silica nanoparticle through coating with octyldecyltrimethoxy silane
Authors: Venkatathri, N
Issue Date: Dec-2007
Publisher: CSIR
IPC Code: Int. Cl.⁸ B82B3/00
Abstract: Silica nanoparticles have been prepared using tetrethylorthosilicate, water, aqueous ammonia, ethanol and octadecyltrimethoxy silane as constituents. Kinetics studies have been carried out to characterize the material by analyzing the yield, which follows an S type curve. At the eighth hour, the yield reaches maximum in time (hours) versus yield (%) plot. In conventional synthesis, a part of the product particles is small in size (100 nm, 80%) while the remaining is bigger in size (300 nm, 20%). The particle size is normalized on addition of octadecyltrimethoxy silane and is increased to a small extent (400 nm). The sample has been analyzed by XRD, SEM, TEM,E-DAX, FT-IR, N₂ adsorption and ²⁸Si MASNMR techniques. The sample is amorphous with surface area of 93.54 m²/g and contains Q₂, Q₃ and Q₄ species. TEM reveals the particles to be core shell type which is absent in ODTS-free samples. The samples show Si-O-Si tetrahedral skeletal vibrations.
Page(s): 1955-1958
ISSN: 0376-4710
Appears in Collections:IJC-A Vol.46A(12) [December 2007]

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