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Vacuum-dried flexible hydrophobic aerogels using bridged methylsiloxane as reinforcement: performance regulation with alkylorthosilicate or alkyltrimethoxysilane co-precursors.
- Source :
-
New Journal of Chemistry . 2/7/2019, Vol. 43 Issue 5, p2204-2212. 9p. - Publication Year :
- 2019
-
Abstract
- Aerogels are porous materials with many attractive properties, but their large-scale applications are always restricted by the laborious procedures and poor mechanical properties. Herein, a novel monolithic flexible hydrophobic aerogel was prepared using a new type of bridged methylsiloxane as a precursor and tetraethoxysilane (TEOS), methyltrimethoxysilane (MTMS) or propyltrimethoxysilane (PTMS) as co-precursors in a facile and environmentally friendly procedure. The bridged precursor can not only help construct networks of aerogels but also act as an enhancer for its particular molecular structure. The co-precursors TEOS, MTMS, PTMS can tailor the texture and the properties of the aerogels by controlling the hydrolysis and condensation rates and their molecular structures. Co-precursors with faster reaction rates result in smaller particle size in the skeleton and a larger specific surface area. The obtained aerogels are hydrophobic and exhibit good mechanical properties with deformation as high as 80% and low density (0.078 g cm−3). The excellent properties make the aerogels good candidates for oil/water separation. [ABSTRACT FROM AUTHOR]
- Subjects :
- *HYDROPHOBIC compounds
*SILOXANES
*CHEMICAL precursors
Subjects
Details
- Language :
- English
- ISSN :
- 11440546
- Volume :
- 43
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- New Journal of Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 134331661
- Full Text :
- https://doi.org/10.1039/c8nj04038a