Yang, Junyi
(2018)
On the rheology and morphology developments of ternary liquid/liquid/particles system with capillary force.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
This is the latest version of this item.
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Unpublished |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: |
|
| ETD Committee: |
| Title | Member | Email Address | Pitt Username | ORCID |
|---|
| Committee Chair | Velankar, Sachin | | | | | Committee Member | McCarthy, John | | | | | Committee Member | Enick, Robert | | | | | Committee Member | Jung-Kun, Lee | | | |
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| 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)
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