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Molecules. 2018 Apr 18;23(4). pii: E945. doi: 10.3390/molecules23040945.

Facile Synthesis of Flexible Methylsilsesquioxane Aerogels with Surface Modifications for Sound- Absorbance, Fast Dye Adsorption and Oil/Water Separation.

Author information

1
School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China. msewj01@zju.edu.cn.
2
School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China. 21626008@zju.edu.cn.
3
School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China. 3150102792@zju.edu.cn.
4
Pan Asia Microvent Tech (Jiangsu) Coporation & Zhejiang University Micro-nano-porous Materials Joint Research Development Center, Changzhou 213100, China. leiwei@microwent.com.cn.
5
Pan Asia Microvent Tech (Jiangsu) Coporation & Zhejiang University Micro-nano-porous Materials Joint Research Development Center, Changzhou 213100, China. dingronghua@microvent.com.cn.
6
Pan Asia Microvent Tech (Jiangsu) Coporation & Zhejiang University Micro-nano-porous Materials Joint Research Development Center, Changzhou 213100, China. zhangyun@microvent.com.cn.
7
School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China. yanghui@zju.edu.cn.

Abstract

New flexible methylsilsesquioxane (MSQ) aerogels have been facilely prepared by a sol-gel process with methyltrimethoxysilane (MTMS) and dimethyldimethoxysilane (DMDMS) as co-precursors, followed by surface modification and ambient pressure drying. The microstructure, mechanical properties and hydrophobicity of these MSQ aerogels after surface modifications of hexamethyldisiloxane (HMDSO) and/or hexamethyldisilazane (HMDS) were investigated in detail, and the applications of surface-modified MSQ aerogels in sound-absorbance, fast dye adsorption and oil/water separation were evaluated, respectively. The MSQ aerogels surface-modified by HMDS possess flexibility, elasticity and superhydrophobicity, and demonstrate good performance in the mentioned applications. The resultant MSQ aerogel used in sound-absorbance has high frequency (about 6 kHz) acoustic absorptivity of up to 80%, benefiting from its macroporous structure and porosity of 94%, and it also possesses intermediate frequency acoustic absorptivity (about 1 kHz) up to 80% owing to its elasticity. This MSQ aerogel can selectively separate oil from oil/water mixtures with high efficiency due to its superhydrophobicity and superlipophilicity, resulting from a lot of methyl groups, density as low as 0.12 cm³·g-1 and a water contact angle as high as 157°. This MSQ aerogel can be assembled to be a monolithic column applied for fast dye adsorption, and shows selective adsorption for anionic dyes and removal efficiency of methyl orange of up to 95%.

KEYWORDS:

MSQ aerogel; dye adsorption; flexibility; oil/water separation; sol-gel; sound-absorbing; surface modification

PMID:
29670068
PMCID:
PMC6017823
DOI:
10.3390/molecules23040945
[Indexed for MEDLINE]
Free PMC Article

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