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Division of Chemistry & Chemical Engineering and Engineering & Applied Science Caltech
Mon 26 Sep 2016, 3:00pm
Institute of Applied Mathematics
ESB 2012
The Swim Pressure of Active Matter
ESB 2012
Mon 26 Sep 2016, 3:00pm-4:00pm


One of the distinguishing features of many living systems is their ability to move, to self-propel, to be active. Through their motion, either voluntarily or involuntarily, living systems are able self-assemble: birds flock, fish school, bacteria swarm, etc. But such behavior is not limited to living systems. Recent advances in colloid chemistry have led to the development of synthetic, nonliving particles that are able to undergo autonomous motion by converting chemical energy into mechanical motion and work – chemical swimming. This swimming or intrinsic activity imparts new behaviors to active matter that distinguish it from equilibrium condensed matter systems. For example, active matter generates its own internal pressure (or stress), which can drive it far from equilibrium and free it from conventional thermodynamic constraints, and by so doing active matter can control and direct its own behavior and that of its surroundings. In this talk I will discuss our recent work on swimmers and on the origin of a new source for stress that is responsible for self-assembly and pattern formation in active matter.

Note for Attendees

Tea beforehand in the PIMS lounge (ESB 4133)