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Colloid and Polymer Science
Erschienen in: Colloid and Polymer Science 3/2015

01.03.2015 | Original Contribution

Transport in droplet-hydrogel composites: response to external stimuli

Erschienen in: Colloid and Polymer Science | Ausgabe 3/2015

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Abstract

Determination of effective transport properties of droplet-hydrogel composites is essential for various applications. The transport of ions through a droplet-hydrogel composite subjected to an electric field is theoretically studied as an initial step toward quantifying the effective transport properties of droplet-hydrogel composites. A three-phase electrokinetic model is used to derive the microscale characteristics of the polyelectrolyte hydrogel, and the droplet is considered an incompressible Newtonian fluid. The droplet-hydrogel interface is modeled as a surface, which encloses the interior fluid. The surface has the thickness of zero and the electrostatic potential ζ. Standard averaging procedures are used to derive the effective governing equation for the current density that captures the macroscopic behavior. The results show that the polymer boundary condition has a modulating impact on the electrical conductivity, and the influence of the boundary condition decreases as the interior fluid viscosity increases. At the limit of the polymer’s no-slip boundary condition, the interior and exterior fluids’ viscosities, Brinkman screening length, and ionic strength have a significant impact on the conductivity. Interestingly, it should be possible to determine the ζ-potential for a droplet-hydrogel composite from measurements of the electrical conductivity with the aid of the formula derived for the conductivity. Finally, the theoretical study for determining the response of droplet-hydrogel composites to an imposed pressure gradient is undertaken, and it is found that the polymer boundary condition has a modulating impact on the response.
Vorheriger Artikel Highly hydrophobic films with high water adhesion by electrodeposition of poly(3,4-propylenedioxythiophene) containing two alkoxy groups
Nächster Artikel Study of Pickering emulsion stabilized by sulfonated cellulose nanowhiskers extracted from sisal fiber

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Metadaten
Titel
Transport in droplet-hydrogel composites: response to external stimuli
Publikationsdatum
01.03.2015
Erschienen in
Colloid and Polymer Science / Ausgabe 3/2015
Print ISSN: 0303-402X
Elektronische ISSN: 1435-1536
DOI
https://doi.org/10.1007/s00396-014-3473-8

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