Facile synthesis of flexible and hydrophobic polymethylsilsesquioxane based silica aerogel via the co-precursor method and ambient pressure drying technique

Wu, Xiaodong; Zhong, Kai; Ding, Jie; Shen, Xiaodong; Cui, Sheng; Zhong, Ya; Ma, Jiaze; Chen, Xiangbao

doi:10.1016/j.jnoncrysol.2019.119826

Cited by 42 publications

(24 citation statements)

References 41 publications

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“…Also the pore‐size distribution‐based TEM image was approximately in the range of 10 to 40 nm with the average sizes of 25 nm, indicating mesopores structure with a high porosity. In addition, an almost uniform structure observed in FE‐SEM and TEM images, which can be due to silica chains realignment and removal of some small molecules during heat treatment 45 . The uniformity in morphology and size of mesopores as well as the existence of open mesopores indicated the appropriate performance of this approach.…”

Section: Resultsmentioning

confidence: 95%

“…In addition, an almost uniform structure observed in FE-SEM and TEM images, which can be due to silica chains realignment and removal of some small molecules during heat treatment. 45 The This property is due to lack of surface modification during preparation process. It is also reported that the hydrophobicity property of silica aerogel is slightly dropped down by applying thermal treatment.…”

Section: Physical Propertiesmentioning

confidence: 99%

“…It is also reported that the hydrophobicity property of silica aerogel is slightly dropped down by applying thermal treatment. 45…”

Section: Physical Propertiesmentioning

confidence: 99%

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Efficient reinforcement of wet gel by embedded polymer as newly approach for silica aerogel

Bananifard

Ashjari

Niazi

et al. 2020

Polymers for Advanced Techs

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Silica aerogel as an ultra-porous material with high specific surface area is fabricated through drying a wet gel. Although ambient pressure drying is considered as simplest method, the obtained physical properties are not very desired. Here, we introduced a novel approach to improve the efficiency of ambient pressure drying technique by enhancing the strength and firmness of pores walls. The tetraethyl orthosilicate was used to produce the wet gel. The gel network was reinforced via embedding the polyvinyl alcohol cross-linkable polymer into porosities of wet gel, and drying at ambient condition, forming an interpenetrating network. The thermal treatment was applied to remove the polymeric phase from structure of reinforced network. A proper specific surface area, good density, and high porosity were achieved about 503 m 2 /g, 0.23 g/cm 3 , and 89%, respectively. Furthermore, the obtained interconnected structure along whit large numbers of open mesopores confirms the acceptable efficiency of introduced facilitated technique.

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Section: Resultsmentioning

confidence: 95%

Section: Physical Propertiesmentioning

confidence: 99%

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Efficient reinforcement of wet gel by embedded polymer as newly approach for silica aerogel

Bananifard

Ashjari

Niazi

et al. 2020

Polymers for Advanced Techs

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“…This organosilane precursor has an alkyl group that cannot be hydrolyzed during the sol–gel process and is hydrophobic, and this process is called silylation. Conventional silylates such as tetraethylorthosilicate (TEOS) can be reacted with trimethylchlorosilane (TMCS) as a silylating agent because TMCS can react with Si–OH and form –OSi (CH 3 ) 3 groups, which can provide hydrophobicity to the resulting silica 7,8 …”

Section: Introductionmentioning

confidence: 99%

“…Conventional silylates such as tetraethylorthosilicate (TEOS) can be reacted with trimethylchlorosilane (TMCS) as a silylating agent because TMCS can react with Si-OH and form -OSi (CH 3 ) 3 groups, which can provide hydrophobicity to the resulting silica. 7,8 Previously, research on the superhydrophobic layer was carried out by Mahadik, Pedraza, and Vhatkar, 9,10 which used methyltriethoxysilane and methoxytrimethylsilane precursors with the aid of TMCS using methanol and NH 4 OH base catalysts. The solution was coated on a glass substrate with deposition time varied from 5 to 25 h and produced the highest contact angle of 172 at the deposition time of 25 h. The silica thin layers also had excellent thermal stability with superhydrophobicity conditions up to 550 C.…”

Section: Introductionmentioning

confidence: 99%

Modification of the glass surface with hydrophobic silica thin layers using tetraethylorthosilicate (TEOS) and trimethylchlorosilane (TMCS) precursors

Darmawan

Rasyid

Astuti

2020

Surface & Interface Analysis

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The synthesis of the hydrophobic silica layer was conducted using the sol–gel method by reacting silica precursor trimethylchlorosilane (TMCS) and tetraethylorthosilicate (TEOS) with variations in the precursor composition ratio (TMCS:TEOS) of 10:90, 25:75, 50:50, 75:25, and 90:10 and then calcined at various temperatures. The TMCS‐TEOS silica thin layer has a significant influence on the surface hydrophobicity of the glass. The higher the number of TMCS precursors, the greater the contact angle produced. The highest contact angle produced was 98° at a TMCS‐TEOS ratio of 75:25 and without calcination. The TMCS‐TEOS silica thin layer contact angle decreased with increasing calcination temperature. The hydrophobicity of the TMCS‐TEOS silica thin layer could withstand temperatures up to 300°C. Quantitative analysis of FTIR spectra's peak area shows that with the increasing TMCS, the ratio of silanol/siloxane decreases. Gas sorption analysis shows that the TMCS‐TEOS thin layers' pore sizes are in the mesoporous region, and the pore shapes are cylindrical at all TMCS:TEOS ratios and calcination temperatures.

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Hybrid Aerogels for Energy Saving Applications

Gizli,

Sert Çok

2024

Aerogels for Energy Saving and Storage

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Facile synthesis of flexible and hydrophobic polymethylsilsesquioxane based silica aerogel via the co-precursor method and ambient pressure drying technique

Cited by 42 publications

References 41 publications

Efficient reinforcement of wet gel by embedded polymer as newly approach for silica aerogel

Efficient reinforcement of wet gel by embedded polymer as newly approach for silica aerogel

Modification of the glass surface with hydrophobic silica thin layers using tetraethylorthosilicate (TEOS) and trimethylchlorosilane (TMCS) precursors

Hybrid Aerogels for Energy Saving Applications

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