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.

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
• Journal: Langmuir
• Print ISSN: 0743-7463
• 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
• Contract Date: Nov 23, 2017