Computations in Science Seminars
Oct 2017
25
Wed 12:15
Tom Witten, University of Chicago
e-mail:
Organizer: Handan Acar ()
How asymmetric colloidal particles create hyperuniform dispersions.

Hyperuniformity of a many-body system means anomalously small density fluctuations. In an ordinary liquid or solution the mean-squared fluctuations E(N - E(N))^2 of particle number N in a given region are proportional to the average particle number E(N). By contrast, in a hyperuniform system E(N - E(N))^2/E(N) goes to 0 as N goes to infinity. The classic example is the one-component plasma, a gas of charged particles with a uniform neutralizing background charge. Recently granular materials[1] and periodically sheared colloidal dispersions[2] were shown to be hyperuniform. We investigate the question of uniformity in a dilute colloidal dispersion in which particles are settling under gravity. When the particles are of generic shapes, their asymmetry strongly affects their interaction via the coupling between orientation, drag and fluid velocity gradients. Two isolated objects generally separate over time. In one regime hyperuniform and anisotropic behavior of the density correlation function probed by light scattering is inevitable.

[1] S.Torquato, Rev. Mod. Phys, vol.82, 2633-2640 (2010).

[2] D. Hexner and D. Levine, Phys. Rev. Lett., vol.114, 110602 (2015).

Nov 2017
1
Wed 12:15
OPEN
Nov 2017
8
Wed 12:15
Jiwoong Park, University of Chicago
e-mail:
Organizer: Glen Hocky ()
Nov 2017
15
Wed 12:15
Hod Lipson, Columbia University
e-mail:
Host: Heinrich Jaeger ()
Organizer: Yuval Yifat ()
Nov 2017
29
Wed 12:15
Emanuela Del Gado, Georgetown University
e-mail:
Host: Heinrich Jaeger
Dec 2017
6
Wed 12:15
Ilya Nemenman, Emory University
e-mail:
Host: Arvind Murugan ()
Jan 2018
10
Wed 12:15
Heinrich Jaeger, University of Chicago
e-mail:
Jan 2018
17
Wed 12:15
OPEN
Jan 2018
24
Wed 12:15
Alberto Fernandez-Nieves, Georgia Tech
e-mail:
Host: William Irvine ()
Jan 2018
31
Wed 12:15
Jens Eggers , University of Bristol
e-mail:
Host: William Irvine ()
Feb 2018
7
Wed 12:15
Haim Diamant, Tel Aviv University
e-mail:
Host: Tom Witten
Feb 2018
14
Wed 12:15
OPEN
Feb 2018
21
Wed 12:15
Ivan I Smalyukh, University of Colorado Boulder
e-mail:
Host: William Irvine ()
Feb 2018
28
Wed 12:15
OPEN
Mar 2018
14
Wed 12:15
OPEN
Mar 2018
28
Wed 12:15
OPEN
Apr 2018
4
Wed 12:15
OPEN
Apr 2018
11
Wed 12:15
OPEN
Apr 2018
18
Wed 12:15
Alfred Crosby, University of Massachusetts Amherst
e-mail:
Host: Heinrich Jaeger
Apr 2018
25
Wed 12:15
OPEN
May 2018
2
Wed 12:15
Ned Wingreen
e-mail:
Host: Arvind Murugan ()
May 2018
9
Wed 12:15
OPEN
May 2018
16
Wed 12:15
OPEN
May 2018
23
Wed 12:15
Ariel Amir, Harvard
e-mail:
Host: Arvind Murugan ()
May 2018
30
Wed 12:15
OPEN
Jun 2018
6
Wed 12:15
OPEN