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Title: Synthesis and properties of Chitosan-silica hybrid aerogels

Abstract

Chitosan, a polymer that is soluble in dilute aqueous acid, is derived from chitin, a natural polyglucosamide. Aquagels where the solid phase consists of both chitosan and silica can be easily prepared by using an acidic solution of chitosan to catalyze the hydrolysis and condensation of tetraethylorthosilicate. Gels with chitosan/TEOS mass ratios of 0.1-1.1 have been prepared by this method. Standard drying processes using CO{sub 2} give the corresponding aerogels. The amount of chitosan in the gel plays a role in the shrinkage of the aerogel during drying. Gels with the lowest chitosan/silica ratios show the most linear shrinkage, up to 24%, while those with the highest ratios show only a 7% linear shrinkage. Pyrolysis at 700 C under nitrogen produces a darkened aerogel due to the thermal decomposition of the chitosan, however, the aerogel retains its monolithic form. The pyrolyzed aerogels absorb slightly more infrared radiation in the 2-5 {micro}m region than the original aerogels. B.E.T. surface areas of these aerogels range from 470-750 m{sup 2}/g. Biocompatibility screening of this material shows a very high value for hemolysis, but a low value for cytotoxicity.

Authors:
;
Publication Date:
Research Org.:
Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
Sponsoring Org.:
USDOE. Office of the Chief Financial Officer. Other Costsand Credits
OSTI Identifier:
918654
Report Number(s):
LBNL-48426
Journal ID: ISSN 0022-3093; JNCSBJ; R&D Project: 0; BnR: YN0100000; TRN: US200819%%378
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
Journal of Non-Crystalline Solids
Additional Journal Information:
Journal Volume: 285; Journal Issue: 1; Related Information: Journal Publication Date: 06/2001; Journal ID: ISSN 0022-3093
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; CHITIN; DRYING; HEMOLYSIS; HYDROLYSIS; INFRARED RADIATION; NITROGEN; POLYMERS; PYROLYSIS; SHRINKAGE; SILICA; SURFACE AREA; SYNTHESIS

Citation Formats

Ayers, Michael R, and Hunt, Arlon J. Synthesis and properties of Chitosan-silica hybrid aerogels. United States: N. p., 2001. Web. doi:10.1016/S0022-3093(01)00442-2.
Ayers, Michael R, & Hunt, Arlon J. Synthesis and properties of Chitosan-silica hybrid aerogels. United States. https://doi.org/10.1016/S0022-3093(01)00442-2
Ayers, Michael R, and Hunt, Arlon J. Fri . "Synthesis and properties of Chitosan-silica hybrid aerogels". United States. https://doi.org/10.1016/S0022-3093(01)00442-2. https://www.osti.gov/servlets/purl/918654.
@article{osti_918654,
title = {Synthesis and properties of Chitosan-silica hybrid aerogels},
author = {Ayers, Michael R and Hunt, Arlon J},
abstractNote = {Chitosan, a polymer that is soluble in dilute aqueous acid, is derived from chitin, a natural polyglucosamide. Aquagels where the solid phase consists of both chitosan and silica can be easily prepared by using an acidic solution of chitosan to catalyze the hydrolysis and condensation of tetraethylorthosilicate. Gels with chitosan/TEOS mass ratios of 0.1-1.1 have been prepared by this method. Standard drying processes using CO{sub 2} give the corresponding aerogels. The amount of chitosan in the gel plays a role in the shrinkage of the aerogel during drying. Gels with the lowest chitosan/silica ratios show the most linear shrinkage, up to 24%, while those with the highest ratios show only a 7% linear shrinkage. Pyrolysis at 700 C under nitrogen produces a darkened aerogel due to the thermal decomposition of the chitosan, however, the aerogel retains its monolithic form. The pyrolyzed aerogels absorb slightly more infrared radiation in the 2-5 {micro}m region than the original aerogels. B.E.T. surface areas of these aerogels range from 470-750 m{sup 2}/g. Biocompatibility screening of this material shows a very high value for hemolysis, but a low value for cytotoxicity.},
doi = {10.1016/S0022-3093(01)00442-2},
url = {https://www.osti.gov/biblio/918654}, journal = {Journal of Non-Crystalline Solids},
issn = {0022-3093},
number = 1,
volume = 285,
place = {United States},
year = {2001},
month = {6}
}