Comparisonal studies of surface modification reaction using various silylating agents for silica aerogel

Ha Yoon Nah; Younghun Kim; Taehee Kim; Kyu Yeon Lee; Vinayak G. Parale; Chang Hyun Lim; Ji Yeon Seo; Hyung Ho Park

doi:10.1007/s10971-020-05399-5

Comparisonal studies of surface modification reaction using various silylating agents for silica aerogel

Ha Yoon Nah, Younghun Kim, Taehee Kim, Kyu Yeon Lee, Vinayak G. Parale, Chang Hyun Lim, Ji Yeon Seo, Hyung Ho Park

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

Surface modification is one of the important steps for synthesizing hydrophobic silica aerogels by ambient pressure drying in which silylating agent plays a vital role. Trimethylchlorosilane and many kinds of methoxysilanes like trimethylmethoxysilane, dimethyldimethoxysilane, and methyltrimethoxysilane have been used as the silylating agents. In this work, silylation effects were investigated with different molar ratios of silylating agent/n-hexane mixture. In addition, the mechanism of the silylation reaction is explained based on the molecular structures by considering the number of methoxy/methyl groups. The silylation extent was characterized by using optical imaging, bulk density and porosity analyses, Fourier-transform infrared spectroscopy, scanning electron microscopy, and Brunauer-Emmett-Teller, Barrett-Joyner-Halenda, and contact angle measurements. It has been found that the methoxysilane-based silylating agents can be used as a replacement without producing the harmful hydrochloric acid and retaining the similar tendency to trimethylchlorosilane in surface modification. This research approach seeks to an alternative silylating agent by investigating the impact on the surface modification based on the molecular structural parameters and reaction mechanisms. [Figure not available: see fulltext.].

Original language	English
Pages (from-to)	346-359
Number of pages	14
Journal	Journal of Sol-Gel Science and Technology
Volume	96
Issue number	2
DOIs	https://doi.org/10.1007/s10971-020-05399-5
Publication status	Published - 2020 Nov 1

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government(MSIT) (No. 2020R1A5A1019131). This work was supported by the Center for Advanced Meta-Materials (CAMM) funded by the Ministry of Science and ICT as “Global Frontier Project” (CAMM- No. 2014M3A6B3063700). This work was supported by the Human Resources Development program (No. 20204030200110) of the Korea Institute of Energy Technology Evaluation and Planning(KETEP) grant funded by the Korea government Ministry of Trade, Industry and Energy.

Publisher Copyright:
© 2020, Springer Science+Business Media, LLC, part of Springer Nature.

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Chemistry(all)
Biomaterials
Condensed Matter Physics
Materials Chemistry

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10.1007/s10971-020-05399-5

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title = "Comparisonal studies of surface modification reaction using various silylating agents for silica aerogel",

abstract = "Surface modification is one of the important steps for synthesizing hydrophobic silica aerogels by ambient pressure drying in which silylating agent plays a vital role. Trimethylchlorosilane and many kinds of methoxysilanes like trimethylmethoxysilane, dimethyldimethoxysilane, and methyltrimethoxysilane have been used as the silylating agents. In this work, silylation effects were investigated with different molar ratios of silylating agent/n-hexane mixture. In addition, the mechanism of the silylation reaction is explained based on the molecular structures by considering the number of methoxy/methyl groups. The silylation extent was characterized by using optical imaging, bulk density and porosity analyses, Fourier-transform infrared spectroscopy, scanning electron microscopy, and Brunauer-Emmett-Teller, Barrett-Joyner-Halenda, and contact angle measurements. It has been found that the methoxysilane-based silylating agents can be used as a replacement without producing the harmful hydrochloric acid and retaining the similar tendency to trimethylchlorosilane in surface modification. This research approach seeks to an alternative silylating agent by investigating the impact on the surface modification based on the molecular structural parameters and reaction mechanisms. [Figure not available: see fulltext.].",

author = "Nah, {Ha Yoon} and Younghun Kim and Taehee Kim and Lee, {Kyu Yeon} and Parale, {Vinayak G.} and Lim, {Chang Hyun} and Seo, {Ji Yeon} and Park, {Hyung Ho}",

note = "Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government(MSIT) (No. 2020R1A5A1019131). This work was supported by the Center for Advanced Meta-Materials (CAMM) funded by the Ministry of Science and ICT as “Global Frontier Project” (CAMM- No. 2014M3A6B3063700). This work was supported by the Human Resources Development program (No. 20204030200110) of the Korea Institute of Energy Technology Evaluation and Planning(KETEP) grant funded by the Korea government Ministry of Trade, Industry and Energy. Publisher Copyright: {\textcopyright} 2020, Springer Science+Business Media, LLC, part of Springer Nature.",

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AU - Lim, Chang Hyun

AU - Seo, Ji Yeon

AU - Park, Hyung Ho

N1 - Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government(MSIT) (No. 2020R1A5A1019131). This work was supported by the Center for Advanced Meta-Materials (CAMM) funded by the Ministry of Science and ICT as “Global Frontier Project” (CAMM- No. 2014M3A6B3063700). This work was supported by the Human Resources Development program (No. 20204030200110) of the Korea Institute of Energy Technology Evaluation and Planning(KETEP) grant funded by the Korea government Ministry of Trade, Industry and Energy. Publisher Copyright: © 2020, Springer Science+Business Media, LLC, part of Springer Nature.

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N2 - Surface modification is one of the important steps for synthesizing hydrophobic silica aerogels by ambient pressure drying in which silylating agent plays a vital role. Trimethylchlorosilane and many kinds of methoxysilanes like trimethylmethoxysilane, dimethyldimethoxysilane, and methyltrimethoxysilane have been used as the silylating agents. In this work, silylation effects were investigated with different molar ratios of silylating agent/n-hexane mixture. In addition, the mechanism of the silylation reaction is explained based on the molecular structures by considering the number of methoxy/methyl groups. The silylation extent was characterized by using optical imaging, bulk density and porosity analyses, Fourier-transform infrared spectroscopy, scanning electron microscopy, and Brunauer-Emmett-Teller, Barrett-Joyner-Halenda, and contact angle measurements. It has been found that the methoxysilane-based silylating agents can be used as a replacement without producing the harmful hydrochloric acid and retaining the similar tendency to trimethylchlorosilane in surface modification. This research approach seeks to an alternative silylating agent by investigating the impact on the surface modification based on the molecular structural parameters and reaction mechanisms. [Figure not available: see fulltext.].

AB - Surface modification is one of the important steps for synthesizing hydrophobic silica aerogels by ambient pressure drying in which silylating agent plays a vital role. Trimethylchlorosilane and many kinds of methoxysilanes like trimethylmethoxysilane, dimethyldimethoxysilane, and methyltrimethoxysilane have been used as the silylating agents. In this work, silylation effects were investigated with different molar ratios of silylating agent/n-hexane mixture. In addition, the mechanism of the silylation reaction is explained based on the molecular structures by considering the number of methoxy/methyl groups. The silylation extent was characterized by using optical imaging, bulk density and porosity analyses, Fourier-transform infrared spectroscopy, scanning electron microscopy, and Brunauer-Emmett-Teller, Barrett-Joyner-Halenda, and contact angle measurements. It has been found that the methoxysilane-based silylating agents can be used as a replacement without producing the harmful hydrochloric acid and retaining the similar tendency to trimethylchlorosilane in surface modification. This research approach seeks to an alternative silylating agent by investigating the impact on the surface modification based on the molecular structural parameters and reaction mechanisms. [Figure not available: see fulltext.].

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Comparisonal studies of surface modification reaction using various silylating agents for silica aerogel

Abstract

Bibliographical note

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