Liquid crystalline behaviour of chitosan in formic, acetic, and monochloroacetic acid solutions

M. Prabaharan, J. P. Borges, M. H. Godinho, J. F. Mano

Research output: Chapter in Book/Report/Conference proceedingConference contribution

24 Citations (Scopus)

Abstract

The objective of this work was to prepare polysaccharide-based gels exhibiting liquid crystalline properties. Such systems may be used in some optical or in biomedical applications, where biodegradability is required. Chitosan is a derivative of chitin, widely used in a series of medical applications. Due to its rigid structure, chitosan or its derivatives may show lyotropic mesophases in certain conditions. In this work, chitosan solutions were prepared by mixing completely the polysaccharide with different concentration of formic, acetic and monochloroacetic acids at room temperature. X-ray diffraction patterns of the gels did not show the existence of a crystalline structure. Finger-prints texture observed by polarised optical microscopy was attributed to a cholesteric liquid crystalline phase that usually develops in concentrated solutions. Values of the nematic chiral pitch (P) were determined in function of acid solution concentration. The critical concentrations (C*) to form a lyotropic liquid crystalline phase in formic, acetic and monochloroacetic acids were determined, and the obtained values were confronted with the expected critical concentration based on the Flory formalism. The critical concentration values were found to be dependent upon the acid used.

Original languageEnglish
Title of host publicationFast Software Encryption - 14th International Workshop, FSE 2007, Revised Selected Papers
PublisherTrans Tech Publications Ltd
Pages1010-1014
Number of pages5
EditionPt. 2
ISBN (Print)978-087849402-6
DOIs
Publication statusPublished - 1 Dec 2006
Event3rd International Materials Symposium and 12th Portuguese Materials Society Meeting 2005 - Aveiro, Portugal
Duration: 20 Mar 200523 Mar 2005

Publication series

NameMaterials Science Forum
PublisherTrans Tech Publications Ltd
NumberPART 2
Volume514-516
ISSN (Print)0255-5476

Conference

Conference3rd International Materials Symposium and 12th Portuguese Materials Society Meeting 2005
CountryPortugal
CityAveiro
Period20/03/0523/03/05

Keywords

  • Birefringence
  • Chitosan
  • Critical concentration
  • Mesophases

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    Prabaharan, M., Borges, J. P., Godinho, M. H., & Mano, J. F. (2006). Liquid crystalline behaviour of chitosan in formic, acetic, and monochloroacetic acid solutions. In Fast Software Encryption - 14th International Workshop, FSE 2007, Revised Selected Papers (Pt. 2 ed., pp. 1010-1014). (Materials Science Forum; Vol. 514-516, No. PART 2). Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/MSF.514-516.1010