Computations in Science Seminars
Sep 2015
30
Wed 12:15
Sarah Cobey, University of Chicago
e-mail:
Host: Michael Rust ()
Oct 2015
7
Wed 12:15
Zvonimir Dogic, Brandeis University
e-mail:
Host: William Irvine ()
Autonomous motility in soft active matter

The laws of equilibrium statistical mechanics impose severe constraints on the properties of conventional materials assembled from inanimate building blocks. Consequently, such materials cannot exhibit spontaneous motion or perform macroscopic work. Inspired by biological phenomena such Drosophilacytoplasmic streaming, our goal is to develop a new category of soft active materials assembled from the bottom-up using animate, energy-consuming building blocks. Released from the constraints of the equilibrium, such internally driven active gels, liquid crystals and emulsions are able to change-shape, crawl, flow, swim, and exert forces on their boundaries to produce macroscopic work. Active matter can serve as a platform for developing novel applications, testing theoretical models of non-equilibrium statistical mechanics and potentially even shedding light on self-organization of living cells.

Oct 2015
14
Wed 12:15
Michael Oppenheimer, Princeton
e-mail:
Host: Daniel Holz ()
Oct 2015
21
Wed 12:15
Kathleen Stebe, University of Pennsylvania
e-mail:
Host: Leo Kadanoff ()
Curvature driven assembly of colloids

Colloidal particles are often directed to assemble by applying external fields to steer them into well-defined structures at given locations. We are developing alternative strategies based on fields that arise when a colloid is placed within soft matter to form an inclusion that generates a potential field. For example, a particle adsorbed on a fluid interface can distort that interface to satisfy its wetting boundary conditions. The distortion has an associated energy field given by the product of its interfacial area and the surface tension. Fields generated by neighboring particles interact to drive assembly; preferred orientations for anisotropic objects emerge. Interface curvature couples to the particle’s capillary energy. By molding the interface to impose well defined curvature fields, we drive microparticles along pre-determined paths to well defined locations with deterministic energies. This example captures the emergent nature of the interactions, and their potential importance in schemes to make reconfigurable materials, since interfaces and their associated capillary energy landscapes can be readily reconfigured. We explore analogies in other reconfigurable soft matter systems. Liquid crystals are one important host medium. Particles immersed in liquid crystals distort the director field to elicit an elastic energy response. Preferred paths and locations for assembly can be defined by molding the director field and its associated defect structures. Particles adhered to lipid bilayer vesicles are another system in which such fields can be generated and exploited. These example systems have important analogies and pronounced differences which we seek to understand and exploit.

Oct 2015
28
Wed 12:15
Tom Lubensky, University of Pennsylvania
e-mail:
Host: Leo Kadanoff ()
Nov 2015
4
Wed 12:15
Eric Siggia, Rockefeller University
e-mail:
Host: Greg Voth
Nov 2015
11
Wed 12:15
David Schuster, University of Chicago
e-mail:
Host: Leo Kadanoff ()
Nov 2015
18
Wed 12:15
Daniel Rothman, MIT
e-mail:
Host: Leo Kadanoff ()
Earth-System Stability through Geologic Time
Dec 2015
2
Wed 12:15
Carlo Graziani, University of Chicago
e-mail:
Host: Daniel Holz
The Biermann Catastrophe in Numerical MHD
Dec 2015
9
Wed 12:15
Charles Kane, University of Pennsylvania
e-mail:
Host: Leo Kadanoff ()
Dec 2015
16
Wed 12:15
Jeremie Palacci, New York University
e-mail:
Host: William Irvine ()
Jan 2016
5
Tue 4:00 PM
Seth Lloyd, MIT
e-mail:
JFI COLLOQUIUM - ROOM W301 - 4:00 PM
Jan 2016
6
Wed 12:15
Seth Lloyd, MIT
e-mail:
Host: Leo Kadanoff ()
Jan 2016
13
Wed 12:15
Eleni Katifori, University of Pennsylvania
e-mail:
Host: David Biron ()
Jan 2016
20
Wed 12:15
OPEN
Jan 2016
27
Wed 12:15
Jeffrey Harvey, University of Chicago
e-mail:
Host: Daniel Holz ()
Feb 2016
3
Wed 12:15
OPEN
Feb 2016
10
Wed 12:15
Mark Bowick, Syracuse University
e-mail:
Host: William Irvine ()
Feb 2016
17
Wed 12:15
Chris Fang-Yen, University of Pennsylvania
e-mail:
Host: David Biron ()
Feb 2016
24
Wed 12:15
OPEN
Mar 2016
2
Wed 12:15
OPEN
Mar 2016
9
Wed 12:15
John Novembre, University of Chicago
e-mail:
Host: Leo Kadanoff ()
Mar 2016
16
Wed 12:15
Randy H. Ewoldt, University of Illinois Urbana-Champain
e-mail:
Host: Leo P. Kadanoff ()
Mar 2016
30
Wed 12:15
OPEN
Apr 2016
6
Wed 12:15
OPEN
Apr 2016
13
Wed 12:15
OPEN
Apr 2016
20
Wed 12:15
OPEN
Apr 2016
27
Wed 12:15
OPEN
May 2016
4
Wed 12:15
OPEN
May 2016
11
Wed 12:15
OPEN
May 2016
18
Wed 12:15
OPEN
May 2016
25
Wed 12:15
OPEN
Jun 2016
1
Wed 12:15
OPEN
Jun 2016
8
Wed 12:15
OPEN