Journal of Colloid and Interface Science 516 (2018) 312–316 Contents lists available at ScienceDirect Journal of Colloid and Interface Science journal homepage: www.elsevier.com/locate/jcis Regular Article Estimation of structural ﬁlm viscosity based on the bubble rise method in a nanoﬂuid Heon Ki Cho, Alex D. Nikolov, Darsh T. Wasan Department of Chemical Biological Engineering, Illinois Institute of Technology, Chicago, IL 60616, United States graphical a bstract ar ti c l e i nf o ab stra ct Article history: When a single bubble moves at a very low capillary number (10 ) through a liquid with dispersed Received 12 December 2017 nanoparticles (nanoﬂuid) inside a vertical tube/capillary, a ﬁlm is formed between the bubble surface Revised 17 January 2018 and the tube wall and the nanoparticles self-layer inside the conﬁned ﬁlm. We measured the ﬁlm thick- Accepted 18 January 2018 ness using reﬂected light interferometry. We calculated the ﬁlm structural energy isotherm vs. the ﬁlm Available online 31 January 2018 thickness from the ﬁlm-meniscus contact angle measurements using the reﬂected light interferometric method. Based on the experimental measurement of the ﬁlm thickness and the calculated values of Keywords: the ﬁlm structural energy barrier, we estimated the structural ﬁlm viscosity vs.
Journal of Colloid and Interface Science – Elsevier
Published: Apr 15, 2018
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