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On the rheology and morphology developments of ternary liquid/liquid/particles system with capillary force

Yang, Junyi (2018) On the rheology and morphology developments of ternary liquid/liquid/particles system with capillary force. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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Abstract

This dissertation is focused on understanding the relationship between rheology and morphology of capillary suspension under various shearing conditions. A model ternary liquid/liquid/particle system is constructed for experimental propose. Particularly in this system, one of the liquid has some preferentiality in wetting towards particles so that liquid meniscus can be formed between particles. Formation of such meniscus can create a network which endows the suspension with a yield stress. Four specific topics are presented: 1) to investigate rheology of pendular network (i.e. only pair-wise connection form between fully wet particles), by examining the dependence of the yielding behavior on flow history, quantify their viscoelasticity, and relate these to the microstructural picture of meniscus rupture; 2) to verify the effect of various wetting conditions on rheology of the capillary suspension. Results show a diminishing solid-like property of such suspension as the particles become less wetting by the minority fluid, which induced particle aggregation; 3) to map the rich variety of morphologies for a model ternary system containing particles which were equally wetted by both polymers, analogous to: Picking emulsions, particle-stabilized foams and bijels 1, 2; 4) to correlate the dynamic morphology of ternary model blend with rheological measurement during creep-recovery via in-situ visualization.


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Details

Item Type: University of Pittsburgh ETD
Status: Unpublished
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Yang, Junyijuy23@pitt.edujuy230000-0002-8232-0416
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairVelankar, Sachin
Committee MemberMcCarthy, John
Committee MemberEnick, Robert
Committee MemberJung-Kun, Lee
Date: 25 September 2018
Date Type: Publication
Defense Date: 10 March 2018
Approval Date: 25 September 2018
Submission Date: 26 June 2018
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 150
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Chemical Engineering
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: emulsion; rheology; interfacial properties
Date Deposited: 25 Sep 2018 15:23
Last Modified: 25 Sep 2018 15:23
URI: http://d-scholarship.pitt.edu/id/eprint/34890

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  • On the rheology and morphology developments of ternary liquid/liquid/particles system with capillary force. (deposited 25 Sep 2018 15:23) [Currently Displayed]

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