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Effects of solvent exchange period and heat treatment on physical and chemical properties of rice husk derived silica aerogels

In this study, hydrophobic silica aerogels were synthesized from rice husk ash-derived sodium silicate through sol-gel processing, solvent exchange, surface modification and ambient pressure drying. By volume, 10% of trimethylchlorosilane (TMCS) in 90% of n-hexane was used as a hydrophobic solution...

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Main Authors: Abdul Halim, Zulhelmi Alif, Mat Yajid, Muhamad Azizi, Hamdan, Halimaton
Format: Article
Published: Springer Science and Business Media B.V. 2021
Subjects:
TJ Mechanical engineering and machinery
Online Access:http://eprints.utm.my/id/eprint/94606/
http://dx.doi.org/10.1007/s12633-020-00421-5
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spelling my.utm.946062022-03-31T15:48:24Z http://eprints.utm.my/id/eprint/94606/ Effects of solvent exchange period and heat treatment on physical and chemical properties of rice husk derived silica aerogels Abdul Halim, Zulhelmi Alif Mat Yajid, Muhamad Azizi Hamdan, Halimaton TJ Mechanical engineering and machinery In this study, hydrophobic silica aerogels were synthesized from rice husk ash-derived sodium silicate through sol-gel processing, solvent exchange, surface modification and ambient pressure drying. By volume, 10% of trimethylchlorosilane (TMCS) in 90% of n-hexane was used as a hydrophobic solution in the surface modification process. The physical and chemical properties of silica aerogels were characterized by density and porosity measurements, scanning electron microscopy (SEM), Fourier transforms infrared (FTIR) spectroscopy, Brunauer–Emmett–Teller theory (BET) and dynamic scanning calorimetry (DSC). The hydrogels prepared were in the form of 2.5 ± 0.5 mm beads and then converted into alcogels through solvent exchange with ethanol for repetition of 3, 6 and 9 days. It is found that the optimal quality of silica aerogels with the BET surface area as high as 668.82 m2/g was obtained from the alcogels of the solvent exchange period of 9 days. Depending on the size of the gel’s block, a longer solvent exchange period will ensure adequate removal of pore water. Post heat treatment on silica aerogels obtained from the 9 days of solvent exchange at 200, 300 and 400 °C for 2 h results in slight decreased of aerogel’s density from 0.048 g/cm3 to 0.039 g/cm3 and the hydrophobicity of the aerogels is decreased above 380 °C as confirmed by DSC analysis. Springer Science and Business Media B.V. 2021 Article PeerReviewed Abdul Halim, Zulhelmi Alif and Mat Yajid, Muhamad Azizi and Hamdan, Halimaton (2021) Effects of solvent exchange period and heat treatment on physical and chemical properties of rice husk derived silica aerogels. Silicon, 13 (1). pp. 251-257. ISSN 1876-990X http://dx.doi.org/10.1007/s12633-020-00421-5
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
topic TJ Mechanical engineering and machinery
spellingShingle TJ Mechanical engineering and machinery
Abdul Halim, Zulhelmi Alif
Mat Yajid, Muhamad Azizi
Hamdan, Halimaton
Effects of solvent exchange period and heat treatment on physical and chemical properties of rice husk derived silica aerogels
description In this study, hydrophobic silica aerogels were synthesized from rice husk ash-derived sodium silicate through sol-gel processing, solvent exchange, surface modification and ambient pressure drying. By volume, 10% of trimethylchlorosilane (TMCS) in 90% of n-hexane was used as a hydrophobic solution in the surface modification process. The physical and chemical properties of silica aerogels were characterized by density and porosity measurements, scanning electron microscopy (SEM), Fourier transforms infrared (FTIR) spectroscopy, Brunauer–Emmett–Teller theory (BET) and dynamic scanning calorimetry (DSC). The hydrogels prepared were in the form of 2.5 ± 0.5 mm beads and then converted into alcogels through solvent exchange with ethanol for repetition of 3, 6 and 9 days. It is found that the optimal quality of silica aerogels with the BET surface area as high as 668.82 m2/g was obtained from the alcogels of the solvent exchange period of 9 days. Depending on the size of the gel’s block, a longer solvent exchange period will ensure adequate removal of pore water. Post heat treatment on silica aerogels obtained from the 9 days of solvent exchange at 200, 300 and 400 °C for 2 h results in slight decreased of aerogel’s density from 0.048 g/cm3 to 0.039 g/cm3 and the hydrophobicity of the aerogels is decreased above 380 °C as confirmed by DSC analysis.
format Article
author Abdul Halim, Zulhelmi Alif
Mat Yajid, Muhamad Azizi
Hamdan, Halimaton
author_facet Abdul Halim, Zulhelmi Alif
Mat Yajid, Muhamad Azizi
Hamdan, Halimaton
author_sort Abdul Halim, Zulhelmi Alif
title Effects of solvent exchange period and heat treatment on physical and chemical properties of rice husk derived silica aerogels
title_short Effects of solvent exchange period and heat treatment on physical and chemical properties of rice husk derived silica aerogels
title_full Effects of solvent exchange period and heat treatment on physical and chemical properties of rice husk derived silica aerogels
title_fullStr Effects of solvent exchange period and heat treatment on physical and chemical properties of rice husk derived silica aerogels
title_full_unstemmed Effects of solvent exchange period and heat treatment on physical and chemical properties of rice husk derived silica aerogels
title_sort effects of solvent exchange period and heat treatment on physical and chemical properties of rice husk derived silica aerogels
publisher Springer Science and Business Media B.V.
publishDate 2021
url http://eprints.utm.my/id/eprint/94606/
http://dx.doi.org/10.1007/s12633-020-00421-5
_version_ 1729703195928690688
score 13.211869

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