Role of oxalic acid in structural formation of sodium silicate-based silica aerogel by ambient pressure drying

Ha Yoon Nah, Vinayak G. Parale, Hae Noo Ree Jung, Kyu Yeon Lee, Chang Hyun Lim, Yang Seo Ku, Hyung-Ho Park

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Abstract: Recently, the demand of sodium silicate-based silica aerogels has decreased due to its inadequate physical properties when compared to those made by other silicon alkoxides. To avoid this problem, introduction of a drying control chemical additive (DCCA) in the sol has received great attention. DCCA is one of the additives that can control the rate of hydrolysis and the condensation reaction in sol state by the formation of hydrogen bonds between DCCA and silanol groups of silica sol. A control over these reactions results in a uniform pore size distribution, which, in turn, decreases the drying stress with a decrease in pore size, in accordance with the Young–Laplace equation. Therefore, the structure of the silica aerogel can be maintained by minimizing the volume shrinkage due to drying stress. In this research, oxalic acid was first used as DCCA in the formation of sodium silicate-based silica aerogel by ambient pressure drying. The physical properties of these silica aerogels can be changed by changing the molar ratio of oxalic acid/Na2SiO3 in the sol state. When the oxalic acid:Na2SiO3 molar ratio was 15 × 10−4 in the sol state, aerogels with high specific surface area (623.2 m2/g), pore volume (4.271 cm3/g), average pore diameter (27.41 nm), high porosity (94.3%), high contact angle (144.09°), and high optical transmittance (75%) were obtained. Graphical abstract: [InlineMediaObject not available: see fulltext.].

Original languageEnglish
Pages (from-to)302-310
Number of pages9
JournalJournal of Sol-Gel Science and Technology
Volume85
Issue number2
DOIs
Publication statusPublished - 2018 Feb 1

Fingerprint

Oxalic Acid
sodium silicates
oxalic acid
Oxalic acid
Aerogels
aerogels
Silicon Dioxide
drying
Silicates
Drying
Polymethyl Methacrylate
Silica
Sodium
Sols
silicon dioxide
porosity
Pore size
Physical properties
physical properties
Condensation reactions

All Science Journal Classification (ASJC) codes

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

Cite this

Nah, Ha Yoon ; Parale, Vinayak G. ; Jung, Hae Noo Ree ; Lee, Kyu Yeon ; Lim, Chang Hyun ; Ku, Yang Seo ; Park, Hyung-Ho. / Role of oxalic acid in structural formation of sodium silicate-based silica aerogel by ambient pressure drying. In: Journal of Sol-Gel Science and Technology. 2018 ; Vol. 85, No. 2. pp. 302-310.
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Role of oxalic acid in structural formation of sodium silicate-based silica aerogel by ambient pressure drying. / Nah, Ha Yoon; Parale, Vinayak G.; Jung, Hae Noo Ree; Lee, Kyu Yeon; Lim, Chang Hyun; Ku, Yang Seo; Park, Hyung-Ho.

In: Journal of Sol-Gel Science and Technology, Vol. 85, No. 2, 01.02.2018, p. 302-310.

Research output: Contribution to journalArticle

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T1 - Role of oxalic acid in structural formation of sodium silicate-based silica aerogel by ambient pressure drying

AU - Nah, Ha Yoon

AU - Parale, Vinayak G.

AU - Jung, Hae Noo Ree

AU - Lee, Kyu Yeon

AU - Lim, Chang Hyun

AU - Ku, Yang Seo

AU - Park, Hyung-Ho

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N2 - Abstract: Recently, the demand of sodium silicate-based silica aerogels has decreased due to its inadequate physical properties when compared to those made by other silicon alkoxides. To avoid this problem, introduction of a drying control chemical additive (DCCA) in the sol has received great attention. DCCA is one of the additives that can control the rate of hydrolysis and the condensation reaction in sol state by the formation of hydrogen bonds between DCCA and silanol groups of silica sol. A control over these reactions results in a uniform pore size distribution, which, in turn, decreases the drying stress with a decrease in pore size, in accordance with the Young–Laplace equation. Therefore, the structure of the silica aerogel can be maintained by minimizing the volume shrinkage due to drying stress. In this research, oxalic acid was first used as DCCA in the formation of sodium silicate-based silica aerogel by ambient pressure drying. The physical properties of these silica aerogels can be changed by changing the molar ratio of oxalic acid/Na2SiO3 in the sol state. When the oxalic acid:Na2SiO3 molar ratio was 15 × 10−4 in the sol state, aerogels with high specific surface area (623.2 m2/g), pore volume (4.271 cm3/g), average pore diameter (27.41 nm), high porosity (94.3%), high contact angle (144.09°), and high optical transmittance (75%) were obtained. Graphical abstract: [InlineMediaObject not available: see fulltext.].

AB - Abstract: Recently, the demand of sodium silicate-based silica aerogels has decreased due to its inadequate physical properties when compared to those made by other silicon alkoxides. To avoid this problem, introduction of a drying control chemical additive (DCCA) in the sol has received great attention. DCCA is one of the additives that can control the rate of hydrolysis and the condensation reaction in sol state by the formation of hydrogen bonds between DCCA and silanol groups of silica sol. A control over these reactions results in a uniform pore size distribution, which, in turn, decreases the drying stress with a decrease in pore size, in accordance with the Young–Laplace equation. Therefore, the structure of the silica aerogel can be maintained by minimizing the volume shrinkage due to drying stress. In this research, oxalic acid was first used as DCCA in the formation of sodium silicate-based silica aerogel by ambient pressure drying. The physical properties of these silica aerogels can be changed by changing the molar ratio of oxalic acid/Na2SiO3 in the sol state. When the oxalic acid:Na2SiO3 molar ratio was 15 × 10−4 in the sol state, aerogels with high specific surface area (623.2 m2/g), pore volume (4.271 cm3/g), average pore diameter (27.41 nm), high porosity (94.3%), high contact angle (144.09°), and high optical transmittance (75%) were obtained. Graphical abstract: [InlineMediaObject not available: see fulltext.].

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