NDLI: Hydrocarbon dispersion of nanospherical silica by a sol–gel process. 2. Alkoxysilane copolymerization

Content Provider	Springer Nature Link
Author	Pedroso, M. Dias, M. Azuma, C. San Gil, R. Mothé, C.
Copyright Year	2003
Abstract	The preparation of hydrocarbon dispersions of nanospherical silica–silicone hybrids by copolymerization of tetraethoxysilane (TEOS) and alkylethoxysilanes such as methyltriethoxysilane (MTEOS) and dimethyldiethoxysilane using a sol–gel process was investigated. Particles completely dispersible in hexane with a diameter in the range 10–24 nm were obtained by means of TEOS and MTEOS copolymerization, using ethanol or methanol as a solvent and a terminator. The solubility of the nanospheres was shown to be dependent on the molar ratio of water to silicon, the reaction time, the terminator concentration as well as the stirring condition. The hexane-dispersible particles have hydroxyl and methyl groups on the surface. A higher conversion of organophilic silica–silicon nanoparticles was attained using trimethylchlorosilane as a terminator and a water-to-silicon molar ratio close to 9.
Starting Page	19
Ending Page	26
Page Count	8
File Format	PDF
ISSN	0303402X
Journal	Colloid and Polymer Science
Volume Number	281
Issue Number	1
e-ISSN	14351536
Language	English
Publisher	Springer-Verlag
Publisher Date	2002-11-01
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Colloid and Surface Chemistry Materials Chemistry Physical and Theoretical Chemistry Polymers and Plastics

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Hydrocarbon dispersion of nanospherical silica by a sol–gel process. 2. Alkoxysilane copolymerization