Location
Diamond 341
Start Date
1-5-2014 9:00 AM
End Date
1-5-2014 10:50 AM
Project Type
Presentation
Description
Soft matter systems are known to exhibit a range of phase behaviors when driven out of thermodynamic equilibrium. Using a confocal rheoscope, we investigated configurations of monodisperse colloidal particles under oscillatory shear. In the absence of shear, colloids, like other soft matter particles, exhibit equilibrium behavior, dominated by random Brownian motion. When colloidal suspensions get sheared, various ordered structures emerge. By modifying shear cell gap width and shear frequency and amplitude, we observed HCP crystalline structure and buckled phase, as well as unexpected density fluctuations. Namely, there were crystalline structured stripes of particles arranged perpendicular to the shear direction. This talk will review the experimental techniques and properties of above mentioned structures.
Faculty Sponsor
Duncan Tate; Liz McGrath
Sponsoring Department
Colby College. Physics and Astronomy Dept.
CLAS Field of Study
Natural Sciences
Event Website
http://www.colby.edu/clas
ID
556
Shear-Induced Structures in Colloidal Suspensions
Diamond 341
Soft matter systems are known to exhibit a range of phase behaviors when driven out of thermodynamic equilibrium. Using a confocal rheoscope, we investigated configurations of monodisperse colloidal particles under oscillatory shear. In the absence of shear, colloids, like other soft matter particles, exhibit equilibrium behavior, dominated by random Brownian motion. When colloidal suspensions get sheared, various ordered structures emerge. By modifying shear cell gap width and shear frequency and amplitude, we observed HCP crystalline structure and buckled phase, as well as unexpected density fluctuations. Namely, there were crystalline structured stripes of particles arranged perpendicular to the shear direction. This talk will review the experimental techniques and properties of above mentioned structures.
https://digitalcommons.colby.edu/clas/2014/program/168