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Journal of Materials Science

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18-12-2017 | Ceramics

Superhydrophobilization of SiO₂ surface with two alkylsilanes for an application in oil/water separation

Authors: Panpailin Seeharaj, Patchara Pasupong, Ekarat Detsri, Pattareeya Damrongsak

Published in: Journal of Materials Science | Issue 7/2018

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Abstract

This study reported a novel approach to superhydrophobilize silica (SiO₂) surface by silanizing with two alkylsilanes including non-polar short hydrocarbon chains of chlorotrimethylsilane (CTMS) followed by long hydrocarbon chains of octadecyltrichlorosilane (OTS). The silanization of CTMS prior to OTS affected the increase in the density of short and long alkyl chains throughout SiO₂ surface resulting in the surface with low surface energy and high degree of hierarchical micro-nanoscale roughness which were responsible for the superhydrophobicity. The oil/water separation filters prepared by coating cotton fabric with the CTMS- and OTS-modified SiO₂/polystyrene (PS) composite using a weight ratio of the modified SiO₂:PS at 2:1 possessed the highest water contact angles of 156° ± 1°. The superhydrophobic/superoleophilic filters showed excellent water repellent, oil/water separation efficiency, and reusability. The results obtained in this study suggest that salinizing the two different structure alkylsilanes, CTMS followed by OTS, can provide synergetic benefit in improving the superhydrophobicity by enhancing the density of alkyl chains on SiO₂ surface. This alternative strategy can be extensively applied for development of other superhydrophobic materials.

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Title: Superhydrophobilization of SiO2 surface with two alkylsilanes for an application in oil/water separation
Authors: Panpailin Seeharaj
Patchara Pasupong
Ekarat Detsri
Pattareeya Damrongsak
Publication date: 18-12-2017
Publisher: Springer US
Published in: Journal of Materials Science / Issue 7/2018
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-017-1925-5

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