Issue 21, 2022, Issue in Progress

Diffusion of dyes in polyelectrolyte-surfactant hydrogels

Abstract

In this work, hydrogels formed by interaction of biopolymeric electrolytes and oppositely charged surfactants are studied from the point of view of their ability to incorporate model hydrophobic dyes in their micelle-like structure. Two types of hydrogels were investigated. The first type was based on cationized dextran cross-linked by sodium dodecylsulphate. The second type was prepared by interactions of hyaluronan with carbethoxypendecinium bromide (septonex). Nile red and Atto488 were used as model dyes for the diffusion experiments. The dyes were dissolved in two different media: surfactant and physiological saline. The diffusion of dyes into hydrogel was monitored over time. Effective diffusion coefficients were determined. It was found that their values are strongly influenced by the hydrogel character, the types of dye used and the solvent. The obtained effective coefficients were higher in comparison with the values determined for the diffusion in the opposite direction (release from the hydrogel). The dyes are presented as free in physiological saline and in the form of micelles or micelle aggregates in surfactants. During diffusion into the hydrogel, they can be gradually incorporated in a “pearl necklace structure” which suppresses their mobility. In contrast, this partial immobilization of dyes can increase the concentration gradient which is a driving force of diffusion. Also, the gradual incorporation of dyes into hydrogel structures influences the values of the effective diffusion coefficients.

Graphical abstract: Diffusion of dyes in polyelectrolyte-surfactant hydrogels

Article information

Article type
Paper
Submitted
13 Apr 2022
Accepted
25 Apr 2022
First published
03 May 2022
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2022,12, 13242-13250

Diffusion of dyes in polyelectrolyte-surfactant hydrogels

M. Klučáková, M. Havlíková, F. Mravec and M. Pekař, RSC Adv., 2022, 12, 13242 DOI: 10.1039/D2RA02379B

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