2007•Diffusion and defect data, solid state data. Part B, Solid state phenomena/Solid state phenomenaRequires access
A New Insight into the Mechanistic Study on Synthesis of Silica Nanospheres
Dong Shin Yun, Hyun Jung Kim, Hyun Chang Shin, V. Narayanan, Jung Whan Yoo, Seong Ho Lee, Dong Jin Lee, Nam Hoon Kim
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Abstract
The physicochemical characteristics (SEM, N2 adsorption, FT-IR, MASNMR) of samples from kinetics (10 min, 20 min, 30 min, 1 h and 3h) of hydrolysis of tetraethyl orthosilicate (TEOS) gives new insight into the synthesis of nanosphere. The particle sizes are increased with time, however, the surface areas decreased. FT-IR investigation reveals the presence of high intensed silanol groups of 960 cm-1 at 10 min, which reduced on progress of the reaction time. This suggests the partial hydrolysis and condensation of alkoxy groups in TEOS. 29Si MASNMR analysis shows the presence three different silica species(Q4, Q3 and Q2) in 10 and 20 min samples. The intensity of Q2 species decreases with time and other species concentration were increased.