Effect of Surfactants on Stability of Colloidal Sols as Precursors in Sol-Gel Encapsulation

Abstract:

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This paper aims to study the effect of three alkyl quaternary salts on stability of colloidal sols further used as water-insoluble oligomers for encapsulation of an active flavonoid compound – quercitin. The preparation procedure is described and practical remarks on silica-based sol-gels are included. It is also demonstrated how to exploit the sol-gel preparation route in order to improve the thermal resistance of quercitin and to increase an optical function - fluorescence. The evolution in time of competitive hydrolysis and condensation processes has been observed by dynamic light scattering measurements. The sol-gel materials with entrapped quercitin molecule have been characterised by spectral methods (FT-IR, UV-VIS-NIR), fluorescence and by thermal analysis as well. Sol-gel materials doped with active flavonoid compound may be used in preparation of some functional materials with bioactive properties.

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Periodical:

Edited by:

Daniela Ionita

Pages:

57-60

DOI:

10.4028/www.scientific.net/KEM.415.57

Citation:

I. Lacatusu et al., "Effect of Surfactants on Stability of Colloidal Sols as Precursors in Sol-Gel Encapsulation", Key Engineering Materials, Vol. 415, pp. 57-60, 2009

Online since:

September 2009

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$35.00

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