Facilitated fabrication of high strength silica aerogels using cellulose nanofibrils as scaffold

Facilitated fabrication of high strength silica aerogels using cellulose nanofibrils as scaffold Article history: Monolithic cellulose nanofibrils (CNF)-silica composite aerogels were successfully prepared by immers- Received 13 November 2015 ing CNF aerogels into a silica solution in a two-step sol-gel process (initial hydrolysis of tetraethyl Received in revised form 16 March 2016 orthosilicate (TEOS) followed by condensation of silica particles). Aerogels were characterized by SEM, Accepted 17 March 2016 BET surface area test, bulk density and silica content analysis, FTIR spectroscopy, and compression test. Available online 24 March 2016 The form of SiO existing in the composite aerogel was the spherical individual particles coated on CNF fibrils. The pH value of condensation solution was found to have great influence on the properties of the Keywords: composite aerogels. By varying the pH value of condensation atmosphere from 8 to 12, the bulk densities Aerogels −3 −3 of composite aerogels were able to be linearly increased from 0.059 g cm to 0.29 g cm , and the silica Cellulose content in the matrix sharply jumped from 3 wt% to 79 wt%. The porosities of the aerogels remained very Silica 2 −1 high, between 85 and 96%, and the surface area of the composite aerogel reached up to 700.1 m g . Compression properties http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Carbohydrate Polymers Elsevier

Facilitated fabrication of high strength silica aerogels using cellulose nanofibrils as scaffold

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Publisher
Elsevier
Copyright
Copyright © 2016 Elsevier Ltd
ISSN
0144-8617
D.O.I.
10.1016/j.carbpol.2016.03.048
Publisher site
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Abstract

Article history: Monolithic cellulose nanofibrils (CNF)-silica composite aerogels were successfully prepared by immers- Received 13 November 2015 ing CNF aerogels into a silica solution in a two-step sol-gel process (initial hydrolysis of tetraethyl Received in revised form 16 March 2016 orthosilicate (TEOS) followed by condensation of silica particles). Aerogels were characterized by SEM, Accepted 17 March 2016 BET surface area test, bulk density and silica content analysis, FTIR spectroscopy, and compression test. Available online 24 March 2016 The form of SiO existing in the composite aerogel was the spherical individual particles coated on CNF fibrils. The pH value of condensation solution was found to have great influence on the properties of the Keywords: composite aerogels. By varying the pH value of condensation atmosphere from 8 to 12, the bulk densities Aerogels −3 −3 of composite aerogels were able to be linearly increased from 0.059 g cm to 0.29 g cm , and the silica Cellulose content in the matrix sharply jumped from 3 wt% to 79 wt%. The porosities of the aerogels remained very Silica 2 −1 high, between 85 and 96%, and the surface area of the composite aerogel reached up to 700.1 m g . Compression properties

Journal

Carbohydrate PolymersElsevier

Published: Aug 20, 2016

References

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