APS March Meeting 2017
Volume 62, Number 4
Monday–Friday, March 13–17, 2017;
New Orleans, Louisiana
Session S53: Assembly of Particles on Fluid Interfaces
11:15 AM–2:15 PM,
Thursday, March 16, 2017
Room: 287
Sponsoring
Units:
GSOFT DFD
Chair: Emilie Dressaire, New York University
Abstract ID: BAPS.2017.MAR.S53.2
Abstract: S53.00002 : Feedback Controlled Colloidal Assembly at Fluid Interfaces
11:51 AM–12:27 PM
Preview Abstract
Abstract
Author:
Michael Bevan
(Johns Hopkins University)
The autonomous and reversible assembly of colloidal nano- and micro- scale
components into ordered configurations is often suggested as a scalable
process capable of manufacturing meta-materials with exotic electromagnetic
properties. As a result, there is strong interest in understanding how
thermal motion, particle interactions, patterned surfaces, and external
fields can be optimally coupled to robustly control the assembly of
colloidal components into hierarchically structured functional
meta-materials.
We approach this problem by directly relating equilibrium and dynamic
colloidal microstructures to kT-scale energy landscapes mediated by
colloidal forces, physically and chemically patterned surfaces, multiphase
fluid interfaces, and electromagnetic fields. 3D colloidal trajectories are
measured in real-space and real-time with nanometer resolution using an
integrated suite of evanescent wave, video, and confocal microscopy methods.
Equilibrium structures are connected to energy landscapes via statistical
mechanical models. The dynamic evolution of initially disordered colloidal
fluid configurations into colloidal crystals in the presence of tunable
interactions (electromagnetic field mediated interactions,
particle-interface interactions) is modeled using a novel approach based on
fitting the Fokker-Planck equation to experimental microscopy and computer
simulated assembly trajectories. This approach is based on the use of
reaction coordinates that capture important microstructural features of
crystallization processes and quantify both statistical mechanical (free
energy) and fluid mechanical (hydrodynamic) contributions. Ultimately, we
demonstrate real-time control of assembly, disassembly, and repair of
colloidal crystals using both open loop and closed loop control to produce
perfectly ordered colloidal microstructures. This approach is demonstrated
for close packed colloidal crystals of spherical particles at fluid-solid
interfaces and is being extended to anisotropic particles and multiphase
fluid interfaces.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2017.MAR.S53.2