Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 460, Issue -, Pages 151-157Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2014.03.039
Keywords
Surface grafted silica particle; Hydrophobic; TEOS; Surface functionalization
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Funding
- National University of Singapore and Solvay, Singapore
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We present a general and reproducible one-pot synthesis method to prepare spherical silica nanoparticles surface-modified with different functional groups directly from tetraethyl orthosilicate (TEOS). In this study, the surfaces of silica spheres were modified to various degrees of hydrophobicity by organosilanes such as 3-aminopropyltrimethoxysilane (APTMS), 3-isobutyltrimethoxysilane (ITMS) and octyltriethoxysilane (OTES). Scanning electron microscopy (SEM) images revealed that the synthesized particles are uniform and monodisperse. The particles are further characterized using Fourier transform infrared spectroscopy (FTIR), cross-polarized Si-29 and C-13 MAS NMR spectroscopy, thermogravimetric analysis (TGA) and water contact angle measurements, confirming the successful grafting of surfaces with the respective functional groups. (C) 2014 Elsevier B.V. All rights reserved.
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