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Robust urethane-bridged silica aerogels available for water-carved aerosculptures

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Back cover

New Journal of Chemistry Vol - 41 Issue - 4

New Journal of Chemistry Vol - 41 Issue - 3

New Journal of Chemistry Vol - 41 Issue - 2

New Journal of Chemistry Vol - 41 Issue - 1

New Journal of Chemistry Vol -39

New Journal of Chemistry Vol -29

New Journal of Chemistry Vol -0

Robust urethane-bridged silica aerogels available for water-carved aerosculptures

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhang, Xuetong Zhang, Yulu Wei, Yong Wang, Jin
Copyright Year	2017
Abstract	Molecular bridged silica aerogels have received extensive interest in recent years due to their easily controlled mechanical properties varying with different organosilane precursors, and without any further post-modification. In this work, a series of novel and robust molecular bridged silica aerogels were prepared by using a symmetrical urethane-bridged monomer, named N,N-bis(propyltriethoxysilyl)carbamide (bPTSCA), which was synthesized via a solvent-free exothermic reaction between 3-isocyanatopropyltriethoxysilane (IPTES) and 3-aminopropyltriethoxysilane (APTES) for several minutes at normal temperature and pressure. The influence of catalysts on the obtained gels and aerogels was studied in detail. It was found that NH4F aqueous solution showed the most effective catalysis capability, and the corresponding aerogels were intact with slight shrinkages. The mechanical strength of these aerogels could reach as high as 100 times more than that of the native silica aerogels (unbridged), and the strength could be easily adjusted from a rigid region to an elastic region simply by varying the sample density. Moreover, these aerogels possessed an interesting character of regional shrinking when encountering with water, which made it possible to fabricate artistic aerosculptures with water or other polar solvents as a graver.
Starting Page	1953
Ending Page	1958
Page Count	6
File Format	HTM / HTML PDF
ISSN	11440546
Volume Number	41
Issue Number	5
Journal	New Journal of Chemistry
DOI	10.1039/c6nj03414d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Ammonium fluoride Urea Engraving Exothermic process (3-Aminopropyl)triethoxysilane Monomer Silicon dioxide
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry Catalysis

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