A Videomicroscopic Investigation of Coupled Reversible Flocculation and Coalescence at Singlet-Doublet Equilibrium in an O/W Emulsion of Low Density Contrast
作者:
Øystein Saether,
Johan Sjöblom,
SvetlanaV. Verbich,
StanislavS. Dukhin,
期刊:
Journal of Dispersion Science and Technology
(Taylor Available online 1999)
卷期:
Volume 20,
issue 1-2
页码: 295-314
ISSN:0193-2691
年代: 1999
DOI:10.1080/01932699908943793
出版商: Taylor & Francis Group
关键词: emulsion destabilization;combined flocculation and coalescence;disaggregation;floc fragmentation;doublet lifetime;singlet-doublet equilibrium;reversible coagulation;time of the elementary act of coalescence
数据来源: Taylor
摘要:
Video enhanced microscopy (VEM) enables direct investigation of dilute emulsions. A practical and effective preparative technique utilizes microslides, which are flat, rectangular microcapillaries made from borosilicate glass. Experimental difficulties due to droplet sedimentation and droplet-microslide wall interaction can be drastically reduced, even eliminated, by the use of low density contrast emulsions, i.e. emulsions where the densities of the dispersed and continuous phases are not very different. The dichlorodecane (DCD)-in-water emulsion is an example of such a system. This system.can as such be used for measurement of the time of theelementary act of coalescence, calculated from the evolution in the droplet size distribution. The developing distributions can be determined through automated VEM.
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