Northwestern Events Calendar


Colloquium: Petia Vlahovska: Active colloidal fluids

When: Friday, October 4, 2019
4:00 PM - 5:00 PM Central

Where: Technological Institute, L211, 2145 Sheridan Road, Evanston, IL 60208 map it

Audience: Faculty/Staff - Student - Public - Post Docs/Docs - Graduate Students

Contact: Yassaman   (847) 491-7650

Group: Physics and Astronomy Colloquia

Category: Academic


Flocks of birds and schools of fish are familiar examples of emergent collective behavior, where interactions between self-propelled (active) individuals lead to coherent motion on a scale much larger than the isolated unit. Similar phenomena have been observed with active micro-particles such as bacteria and motile colloids.  Recently, the Quincke instability (spontaneous spinning of a dielectric particle in an applied uniform DC field) has attracted great interest as a means of propelling colloids, by simply letting the particles roll on a surface.   In this talk, I will present our experiments showing how Quincke rollers, previously studied mainly as active Brownian particles, can be designed to perform Run-and-Tumble-like locomotion mimicking bacteria such as E. coli. Populations of the Quincke random walkers self-organize and exhibit behaviors reminiscent of bacterial suspensions such as dynamic clusters and mesoscale turbulent-like flows. I will also discuss some novel collective dynamics of Quincke rotors levitating in a bulk fluid: unlike the rollers, the “hovers” form crystals, chains and other dynamical assemblies. 

Seminar Speaker: Petia Vlahovska, Northwestern University

 Host: Tchekhovskoy

Keywords: Physics, Astronomy, Seminar, Colloquium

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