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231224s2012 xx |||||o 00| ||eng c |
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|a 10.1021/la302945b
|2 doi
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|a eng
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|a Duan, Yannan
|e verfasserin
|4 aut
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|a Surface modification and reinforcement of silica aerogels using polyhedral oligomeric silsesquioxanes
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|c 2012
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|a Text
|b txt
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Completed 26.03.2013
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|a Date Revised 30.10.2012
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a This study evaluated polyhedral oligomeric silsesquioxane (POSS) molecules as useful, multifunctional reinforcing agents of silica aerogels. Silica aerogels have low-density and high surface area, although their durability is often compromised by the inherent fragility and strong moisture absorption behavior of the silica networks. POSS molecules carrying phenyl, iso-butyl, and cyclohexyl organic side groups, and several Si-OH functionalities were incorporated into silica networks via reactions between Si-OH functionalities in POSS molecules and silanes. Solid state (13)C and (29)Si NMR spectra established that greater than 90% of POSS molecules grafted onto silica networks and led to an increase in fractal dimensions. An almost 6-fold increase in compressive modulus was achieved with less than 5 wt % trisilanol phenyl POSS, and a 50-fold decrease in polarity with negligible changes in density were seen in aerogels modified with less than 5 wt % trisilanol isobutyl POSS
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|a Journal Article
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|a Jana, Sadhan C
|e verfasserin
|4 aut
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|a Reinsel, Anna M
|e verfasserin
|4 aut
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|a Lama, Bimala
|e verfasserin
|4 aut
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| 700 |
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|a Espe, Matthew P
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 28(2012), 43 vom: 30. Okt., Seite 15362-71
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|g year:2012
|g number:43
|g day:30
|g month:10
|g pages:15362-71
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