Journal Article

FZJ-2014-05657

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Local Interfacial Migration of Clay Particles within an Oil Droplet in an Aqueous Environment

Kang, K. (Corresponding Author)FZJ* ; Hong, J. S. ; Dhont, J. K. G.FZJ*

2014
Soc. Washington, DC

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Please use a persistent id in citations: http://hdl.handle.net/2128/8077  doi:10.1021/jp508333u

Abstract: We discuss the interfacial migration due to Marangoni forces of clay particles within an oil droplet that is immersed in water, which is relevant for the formation kinetics of Pickering emulsions. Hydrophilic (MMT) and hydrophobic (OMT) clays are studied, where the hydrophilic clay particles adsorb in the oil–water interface, contrary to the hydrophobic clays. The feasibility of an “image–time correlation technique” is discussed, in order to probe the local interfacial migration velocities of clay particles in the oil droplet. Here, correlation functions are constructed from time-resolved images, in order to quantify the local migration of clay particles. Correlation functions are measured at different waiting times, that is, the time after formation of the droplet. The initial decay rate and the baseline of these correlation functions depend on the waiting time in a qualitatively different way for the two clays, which is attributed to the different interfacial migration behavior for the hydrophilic, adsorbing clays and the nonadsorbing, hydrophobic clays as a result of the Marangoni effect.

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Contributing Institute(s):

1. Weiche Materie (ICS-3)

Research Program(s):

1. 451 - Soft Matter Composites (POF2-451) (POF2-451)

Appears in the scientific report 2014

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Database coverage:
; ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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