ChE SEMINAR: Transport and Dynamics of Soft Materials: Curious Case of Self-assembled Surfactant Micelles


9:00 am-10:00 am
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HPNP 1404
1225 Center Drive
Gainesville, Florida 32611


Title: Transport and Dynamics of Soft Materials: Curious Case of Self-assembled Surfactant Micelles

Bio: Dr. Mohammadigoushki is an Associate Professor in the Department of Chemical and Biomedical Engineering, at FAMU-FSU College of Engineering. He is also an affiliated faculty at the National High Magnetic Field Laboratory since August 2016. He received his PhD in Chemical and Biological Engineering in 2014 from University of British Columbia, Canada and spent two years as a Postdoctoral Researcher in the department of Chemical and Biomolecular Engineering at UC Berkeley. His group conducts experimental and continuum modeling research on transport and dynamics of soft materials with applications in energy, biotechnology, and medicine. His team work on a diverse range of research problems including dynamics and structure of self-assembled surfactant solutions in flows, locomotion in complex fluids, protein interaction with fluid-fluid interfaces and transport of metal salts under magnetic fields. His group uses an array of experimental techniques such as rheology (shear and extensional), Rheo-Optics, Rheo-NMR spectroscopy, and MR Imaging. His research has been supported by NSF, NIH, DARPA, as well as industrial partners.

Abstract: Shear banding, i.e., discontinuities in velocity gradients in flowing materials, has been reported in a host of soft materials including oil-sands, granular materials, emulsions, suspensions, associative polymers, foams, and worm-like micelles (WLMs). The primary focus of our team is on entangled WLMs, which provide a model fluid system for studies of shear banding. These systems show remarkably simple rheological behavior, are easy to prepare and not susceptible to aging or shear mechanical degradation, which make them promising candidates in plethora of applications, including, in household products, oil-gas fields, in biomedicine, cleaning processes, nano-templating, and catalysis. The non-linear rheological and flow response of WLMs has proven to be incredibly rich and complex. In this talk, I will address recent advances made in my lab on flow, dynamics, and microstructure of shear banding WLMs. In particular, in this talk, I will address 1) how a shear banded WLMs flow is formed upon inception of flow, and 2) the molecular origin of shear banding using a combination of optical, and NMR based techniques.


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Department of Chemical Engineering