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
Carbohydrate Polymers – Elsevier
Published: Aug 20, 2016
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