NDLI: Nanocomposite material with immobilized acid-base dyes conjugated with polysaccharides

Content Provider	Springer Nature Link
Author	Shchipuv, Yu. A. Khlebnikov, O. N.
Copyright Year	2011
Abstract	Water-soluble acid-base dyes xylenol orange and methyl red are linked by covalent bonds to chitosan macromolecules; neutral dye red is bound to carboxymethyl cellulose to prevent their washing-off from silicate matrix. Dye conjugates were then immobilized by modified sol-gel method using silicate precursor compatible with polysaccharides. Synthesized hybrid nanocomposite materials are optically transparent, which makes it possible to apply them to develop sensors for measuring pH. Spectral characteristics of dyes, their conjugates, and prepared nanocomposites with silicate matrix are studied in detail. It is shown that xylenol orange, which is linked with chitosan by covalent bonds, is the most suitable dye for the development of sensor materials because the conjugation by carboxyl groups, which do not directly bound with chromophore center, does not deteriorate the spectral properties of this dye. In the cases of methyl red and neutral red dyes, undesirable changes in their properties in the course of conjugation are caused by the covalent binding by functional groups, which are auxochromes directly affecting all spectral characteristics of dyes. An increase in the solubility of polysaccharide in water can also positively affect the covalent binding of dyes with chitosan that allows polysaccharide to be used in neutral and alkaline media.
Starting Page	418
Ending Page	429
Page Count	12
File Format	PDF
ISSN	1061933X
Journal	Colloid Journal
Volume Number	73
Issue Number	3
e-ISSN	16083067
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2011-06-05
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Surfaces and Interfaces, Thin Films Polymer Sciences
Content Type	Text
Resource Type	Article
Subject	Colloid and Surface Chemistry Physical and Theoretical Chemistry Surfaces and Interfaces

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