Multiscale probing of colloidal gelation dynamics
Name
1057287046-MIT.pdf
Description
Full printable version
Size
10.68 MB
Format
Adobe PDF
Checksum (MD5)
af04940301e4ecb513bc74a3febd2992
Author(s)
Cho, Jae Hyung(Scientist in mechanical engineering) Massachusetts Institute of Technology
Advisor(s)
Irmgard Bischofberger.
Date Issued
2018
Publisher
Massachusetts Institute of Technology
Abstract
Colloidal gels are viscoelastic materials characterized by the collective behavior of particles that form a space-spanning network. Although the network structure embodies the aggregation process of the particles, the kinetic pathway from a stable suspension to such a complex microstructure remains poorly understood. In this work, we explore the evolution of microscopic structure and dynamics of home-made colloidal particles in the early phase of gelation, by extending the applicability of Differential Dynamic Microscopy (DDM) to non-ergodic media. We demonstrate uncoupled development of the structure and dynamics that reveals an intermediate stage of gel formation, and compare the DDM results with the rheological features of evolving gels. We finally show how understanding the gelation at multiple length and time scales via DDM and rheology opens new ways to tune the mechanical properties of colloidal gels that bear inherent versatility.
Description
Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2018.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 69-71).
Subjects
Mechanical Engineering.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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