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Compartmentalization and separation of aqueous reagents in the water droplets of water-in-oil high internal phase emulsions

Dunstan, Timothy S.; Fletcher, Paul D. I.

Authors

Paul D. I. Fletcher



Abstract

We have compartmentalised aqueous reagents and indicator species within the micron-sized water droplets of mixed high internal phase emulsions (HIPEs). Mass transport of the reagents across the micron-thickness oil films separating the water droplets followed by reaction with the indicator species produces a visible color change which provides a simple method to measure the trapping times of the reagents. Trapping times have been measured for an uncharged reagent (hydrogen peroxide) and charged reagents (HCl and NaClO) in different HIPEs. The trapping times are discussed in terms of a model in which the transferring species partitions from the water to the oil film followed by a rate-determining step of diffusion across the oil film. Rather surprisingly, it is found that trapping times are of similar orders of magnitude for both uncharged and charged aqueous species transferring across liquid oil films.

Citation

Dunstan, T. S., & Fletcher, P. D. I. (2011). Compartmentalization and separation of aqueous reagents in the water droplets of water-in-oil high internal phase emulsions. Langmuir : the ACS journal of surfaces and colloids, 27(7), 3409-3415. https://doi.org/10.1021/la200058d

Journal Article Type Article
Acceptance Date Feb 11, 2011
Publication Date Apr 5, 2011
Deposit Date Nov 13, 2014
Publicly Available Date Mar 29, 2024
Journal Langmuir
Print ISSN 0743-7463
Electronic ISSN 1520-5827
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 27
Issue 7
Pages 3409-3415
DOI https://doi.org/10.1021/la200058d
Keywords Spectroscopy; Electrochemistry; General Materials Science; Surfaces and Interfaces; Condensed Matter Physics
Public URL https://hull-repository.worktribe.com/output/466540
Publisher URL https://pubs.acs.org/doi/abs/10.1021/la200058d
Additional Information Sherpa: can archive post-print (ie final draft post-refereeing) Restrictions: If mandated by funding agency or employer/ institution