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Monday, January 06, 2014
3:00 PM - 4:00 PM
CNLS Conference Room (TA-3, Bldg 1690)


Colloids, Coffee Rings, and Phonons

Arjun Yodh
University of Pennsylvania

I will discuss findings from recent experiments with colloidal suspensions which reveal new phenomena associated with a surprisingly broad range of problems. The first set of experiments employ temperature-sensitive microgel particles to study soft phonons in colloidal glasses which appear to be relevant to the mechanical responses of disordered solids [1]. The second set explores the role of particle shape in affecting particle deposition during evaporation, i.e., the affect of particle shape on the coffee ring effect [2].


[1] Chen, K., Ellenbroek, W.G., Zhang, Z.X., Chen, D.T.N., Yunker, P.J., Henkes, S., Brito, C., Dauchot, O., van Saarloos, W., Liu, A.J., and Yodh, A.G., Physical Review Letters 105, 025501 (2010); Chen, K., Manning, M.L., Yunker, P.J., Ellenbroek, W.G., Zhang, Z., Liu, A.J., and Yodh, A.G., Physical Review Letters 107, 108301 (2011).

[2]Yunker, P.J., Still, T., Lohr, M.A., and Yodh, A.G., Nature 476, 308--311 (2011); Yunker, P.J., Gratale, M., Lohr, M.A., Still, T., Lubensky, T.C., and Yodh, A.G., Physical Review Letters 108, 228303 (2012); Yunker, P.J., Lohr, M.A., Still, T., Borodin, A., Durian, D.J., and Yodh, A.G., Phys. Rev. Lett. 110, 035501 (2013).

Host: Lena Lopatina