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VERSION:2.0
PRODID:icalendar-ruby
CALSCALE:GREGORIAN
X-WR-CALNAME:MEMS Seminar:  Michelle Driscoll\, PhD
X-WR-TIMEZONE:Central Time (US & Canada)
BEGIN:VEVENT
DTSTAMP:20260819T184709Z
UID:tag:localist.com\,2008:EventInstance_51764880676445
DTSTART:20260129T203000Z
DTEND:20260129T213000Z
DESCRIPTION:Microrollers in tight spaces: confinement-induced structuring a
 nd hydrodynamic trapping\n\nAbstract:  Driven suspensions\, where energy i
 s input at a particle scale\, are both models for understanding general pr
 inciples of out-of-equilibrium self-organization\, and also materials with
  enormous near-term applications potential. My work is focused on magnetic
 ally-actuated suspensions\; I study how these materials assemble into dyna
 mical structures\, as well as how they interact with obstacles and boundar
 ies. While the model system we employ is very simple (spinning particles i
 n water)\, the strong hydrodynamic interactions between individual particl
 es and with nearby boundaries lead to a rich array of emergent and dynamic
 ally-assembled structures.   Recently\, we found that even simple modulati
 ons to nearby boundaries can have dramatic consequences: a single post-sha
 ped obstacle can act as a hydrodynamic trap\, and capture a passing partic
 le.  Moreover\, the strength of this trapping can be easily be tuned by ad
 justing either the obstacle curvature or the particle-obstacle repulsive p
 otential. This work demonstrates the complexity of this dynamical system: 
 microrollers can become trapped by an obstacle\, this trapping is stochast
 ic\, and most surprising\, it is enabled by and not destroyed by thermal f
 luctuations. We are currently exploring interactions with more complex str
 ucture\, for example how highly confined structures (channels\, tunnels\, 
 etc) modify the mobility of these driven suspensions.  We find that this s
 trong confinement induces unexpected density fluctuations\, which are the 
 result of large-scale flow recirculation. This work provides fundamental i
 nsights to help us understand suspension transport in more complex structu
 red environments\, for example as found in living systems\, as well as how
  we can use these particles to reconfigure their local environment.
GEO:38.648882;-90.302207
LOCATION:Stephen F. & Camilla T. Brauer Hall\, 012
SUMMARY:MEMS Seminar:  Michelle Driscoll\, PhD
URL;VALUE=URI:https://happenings.washu.edu/event/mems-seminar-michelle-dris
 colle-phd
CATEGORIES:Seminar/Colloquia
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