Stabilizing bubble and droplet interfaces using dipeptide hydrogels

Aviño, F., Matheson, A. B., Adams, D. J. and Clegg, P. S. (2017) Stabilizing bubble and droplet interfaces using dipeptide hydrogels. Organic and Biomolecular Chemistry, 15(30), pp. 6342-6348. (doi: 10.1039/C7OB01053B) (PMID:28703237)

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Hydrophobic dipeptide molecules can be used to create interfacial films covering bubbles and droplets made from a range of oils. At high pH, the dipeptide molecules form micelles which transform into a hydrogel of fibres in response to the addition of salt. We characterize the properties of the hydrogel for two different salt (MgSO4) concentrations and then we use these gels to stabilize interfaces. Under high shear, the hydrogel is disrupted and will reform around bubbles or droplets. Here, we reveal that at low dipeptide concentration, the gel is too weak to prevent ripening of the bubbles; this then reduces the long-term stability of the foam. Under the same conditions, emulsions prepared from some oils are highly stable. We examine the wetting properties of the oil droplets at a hydrogel surface as a guide to the resulting emulsions.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Adams, Dave
Authors: Aviño, F., Matheson, A. B., Adams, D. J., and Clegg, P. S.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Organic and Biomolecular Chemistry
Publisher:Royal Society of Chemistry
ISSN (Online):1477-0539
Published Online:05 July 2017
Copyright Holders:Copyright © 2017 The Royal Society of Chemistry
First Published:First published in Organic and Biomolecular Chemistry 15(30): 6342-6348
Publisher Policy:Reproduced under a Creative Commons license

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
768041Multicomponent Supramolecular HydrogelsDave AdamsEngineering and Physical Sciences Research Council (EPSRC)EP/L021978/2SCHOOL OF CHEMISTRY