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Dimensionally stable cellulosic aerogels functionalized by titania

Authors
  • Postnova, Irina1, 2
  • Khlebnikov, Oleg2
  • Silant’ev, Vladimir2
  • Shchipunov, Yury2
  • 1 Far-East Federal University, Russia , (Russia)
  • 2 Russian Academy of Sciences, Russia , (Russia)
Type
Published Article
Journal
Pure and Applied Chemistry
Publisher
Walter de Gruyter GmbH
Publication Date
Sep 24, 2018
Volume
90
Issue
11
Pages
1755–1771
Identifiers
DOI: 10.1515/pac-2018-0706
Source
De Gruyter
Keywords
License
Yellow

Abstract

The study is aimed at imparting dimensional stability and some functionalities to cellulosic aerogels. The polysaccharide suffers from mechanical strength loss in wetted state that restricts its application. Improvement is achieved by mean of microfibrillation of cellulosic fibers combining intense mechanical treatment with freeze-thawing. Addition of the latter decreases the number of cycles. Aerogels prepared from microfibrillated cellulose by freeze-drying hold their dimensional stability in solutions that makes possible treating them chemically without loss in shape. Here a method of directional sol-gel processing is applied to mineralize such aerogels by titania. Owing to covalent bonds to cellulose macromolecules formed via the condensation reactions, titania coating possesses good adhesion, not separating at heating when it is transferred in anatase form. Its photocatalytic activity results in self-cleaning of cellulose aerogels under outdoor sunlight irradiation. Calcination in air or carbonization in an inert gas atmosphere can serve to prepare metal oxide or composites with carbon of various shape and dimensionality.

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