Extending yield-stress fluid paradigms

In this thesis, we present two new paradigms for yield-stress fluids; the first organizes the existing understanding of the various ways to achieve a yield-stress fluid into a useful methodology for the design of rheologically complex materials; the second is based on the discrepancy in the behavior in extension of model yield-stress fluids versus application-relevant materials. Through implementation of material design principles of selection and synthesis, yield-stress fluid microstructures are organized according to the two known mechanical interactions capable of producing them (jamming and attraction). This rheology-to-structure inverse problem reveals trade-offs in designing yield-stress fluids, demonstrating that multiple material classes can achieve a target yield stress, providing the opportunity for creative design to achieve both the yield stress and other secondary design criteria. A secondary design criteria that is investigated in depth here is extensibility. We introduce a method for characterizing the extensibility of yield-stress fluids, demonstrate the extent to which existing model materials differ from the high extensibility seen in real yield-stress fluids (commercial products, biomaterials), and introduce an attempt at creating a model material for highly-extensible yield-stress fluids.

Name thesis:degree_name

M.S.

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Mechanical Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2016

Author dc:creator

• Nelson, Arif Zainuddin

Contributors dc:contributor

• Ewoldt, Randy H

• Rheology
• Design
• Yield-Stress Fluid
• Bingham
• Extensibility
• Materials Selection
• Materials Synthesis

Statement dc:rights

• Copyright 2015 Arif Nelson

Language dc:language

en

Handle dc:identifier

http://hdl.handle.net/2142/88968

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/88968