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Superhydrophobic Methylated Silica Sol for Effective Oil–Water Separation

Superhydrophobic methylated silica with a core–shell structure was successfully fabricated by a sol-gel process. First, a pristine silica gel with an average particle size of ca. 110 nm was prepared, using tetraethylorthosilicate (TEOS) as a precursor, ethanol as a solvent, and NH(4)OH as a catalyst...

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Detalles Bibliográficos
Autores principales: Li, Jiao, Ding, Hao, Zhang, Heqiang, Guo, Chunlin, Hong, Xiaoyan, Sun, Luyi, Ding, Fuchuan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7078611/
https://www.ncbi.nlm.nih.gov/pubmed/32069780
http://dx.doi.org/10.3390/ma13040842
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author Li, Jiao
Ding, Hao
Zhang, Heqiang
Guo, Chunlin
Hong, Xiaoyan
Sun, Luyi
Ding, Fuchuan
author_facet Li, Jiao
Ding, Hao
Zhang, Heqiang
Guo, Chunlin
Hong, Xiaoyan
Sun, Luyi
Ding, Fuchuan
author_sort Li, Jiao
collection PubMed
description Superhydrophobic methylated silica with a core–shell structure was successfully fabricated by a sol-gel process. First, a pristine silica gel with an average particle size of ca. 110 nm was prepared, using tetraethylorthosilicate (TEOS) as a precursor, ethanol as a solvent, and NH(4)OH as a catalyst. Then, the superhydrophobic methylated silica sol was prepared by introducing methyltrimethoxysilane (MTMS), to graft the surface of the pristine silica gel with methyl groups. The structure and morphology of the methylated silica sol were characterized by Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FE-SEM), and transmission electron microscope (TEM). The characterization results showed that methyl groups were successfully grafted onto the surface of the pristine silica, and the diameter of the methylated silica was increased by 5–10 nm. Various superhydrophobic surfaces on glass, polyethylene terephthalate (PET) fabric, cotton, open-cell polyurethane (PU) foam, and polypropylene (PP) filter cloth were successfully constructed by coating the above substrates with the methylated silica sol and reached with a maximum static water contact angle and slide angle of 161° and 3°, respectively. In particular, the superhydrophobic PP filter cloth exhibited promising application in oil–water separation. The separation efficiency of different oil–water mixtures was higher than 96% and could be repeated at least 15 times.
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spelling pubmed-70786112020-04-21 Superhydrophobic Methylated Silica Sol for Effective Oil–Water Separation Li, Jiao Ding, Hao Zhang, Heqiang Guo, Chunlin Hong, Xiaoyan Sun, Luyi Ding, Fuchuan Materials (Basel) Article Superhydrophobic methylated silica with a core–shell structure was successfully fabricated by a sol-gel process. First, a pristine silica gel with an average particle size of ca. 110 nm was prepared, using tetraethylorthosilicate (TEOS) as a precursor, ethanol as a solvent, and NH(4)OH as a catalyst. Then, the superhydrophobic methylated silica sol was prepared by introducing methyltrimethoxysilane (MTMS), to graft the surface of the pristine silica gel with methyl groups. The structure and morphology of the methylated silica sol were characterized by Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FE-SEM), and transmission electron microscope (TEM). The characterization results showed that methyl groups were successfully grafted onto the surface of the pristine silica, and the diameter of the methylated silica was increased by 5–10 nm. Various superhydrophobic surfaces on glass, polyethylene terephthalate (PET) fabric, cotton, open-cell polyurethane (PU) foam, and polypropylene (PP) filter cloth were successfully constructed by coating the above substrates with the methylated silica sol and reached with a maximum static water contact angle and slide angle of 161° and 3°, respectively. In particular, the superhydrophobic PP filter cloth exhibited promising application in oil–water separation. The separation efficiency of different oil–water mixtures was higher than 96% and could be repeated at least 15 times. MDPI 2020-02-13 /pmc/articles/PMC7078611/ /pubmed/32069780 http://dx.doi.org/10.3390/ma13040842 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Li, Jiao
Ding, Hao
Zhang, Heqiang
Guo, Chunlin
Hong, Xiaoyan
Sun, Luyi
Ding, Fuchuan
Superhydrophobic Methylated Silica Sol for Effective Oil–Water Separation
title Superhydrophobic Methylated Silica Sol for Effective Oil–Water Separation
title_full Superhydrophobic Methylated Silica Sol for Effective Oil–Water Separation
title_fullStr Superhydrophobic Methylated Silica Sol for Effective Oil–Water Separation
title_full_unstemmed Superhydrophobic Methylated Silica Sol for Effective Oil–Water Separation
title_short Superhydrophobic Methylated Silica Sol for Effective Oil–Water Separation
title_sort superhydrophobic methylated silica sol for effective oil–water separation
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7078611/
https://www.ncbi.nlm.nih.gov/pubmed/32069780
http://dx.doi.org/10.3390/ma13040842
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