Eco-Friendly Fabrication of Highly Stable Silica Aerogel Microspheres with Core-Shell Structure

Silica aerogel microspheres show great potential in various fields as fillings in different materials. It is important to diversify and optimize the fabrication methodology for silica aerogel microspheres (SAMS). This paper presents an eco-friendly synthetic technique for producing functional silica...

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Veröffentlicht in:Polymers 2023-04, Vol.15 (8), p.1882
Hauptverfasser: Cai, Gao, Ni, Haisong, Li, Xunzhang, Wang, Yangxin, Zhao, Huaixia
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container_title Polymers
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creator Cai, Gao
Ni, Haisong
Li, Xunzhang
Wang, Yangxin
Zhao, Huaixia
description Silica aerogel microspheres show great potential in various fields as fillings in different materials. It is important to diversify and optimize the fabrication methodology for silica aerogel microspheres (SAMS). This paper presents an eco-friendly synthetic technique for producing functional silica aerogel microspheres with a core-shell structure. Mixing silica sol with commercial silicone oil containing olefin polydimethylsiloxane (PDMS) resulted in a homogeneous emulsion with silica sol droplets dispersed in the oil. After gelation, the droplets were transformed into silica hydrogel or alcogel microspheres and coated with the polymerization of the olefin groups. Microspheres with silica aerogel as their core and polydimethylsiloxane as their shell were obtained after separation and drying. The sphere size distribution was regulated by controlling the emulsion process. The surface hydrophobicity was enhanced by grafting methyl groups onto the shell. The obtained silica aerogel microspheres have low thermal conductivity, high hydrophobicity, and excellent stability. The synthetic technique reported here is expected to be beneficial for the development of highly robust silica aerogel material.
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subjects Aqueous solutions
Contact angle
Core-shell structure
Dimethylpolysiloxane
Droplets
Emulsion polymerization
Ethanol
Hydrogels
Hydrophobic surfaces
Hydrophobicity
Methods
Microspheres
Olefins
Polydimethylsiloxane
Polymerization
Silica
Silica aerogels
Size distribution
Solvents
Thermal conductivity
title Eco-Friendly Fabrication of Highly Stable Silica Aerogel Microspheres with Core-Shell Structure
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