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Spatially controlled reversible colloidal self-assembly
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DOI：10.1063/1.3243686.png)
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Abstract
En 中文
We studied the localized self-assembly of colloidal crystals on a topographically patterned substrate. A competition between particle and pattern interactions provided the ability to reversibly assemble quasi-two-dimensional colloidal crystals on a periodic landscape. The assembly process was visualized and controlled in real-space and real-time using video microscopy. Independent measurements and computer simulations were used to quantify all interactions controlling self-assembly. Steady-state studies characterized spatially inhomogeneous, coexisting fluid and crystal microstructures at various stages of assembly. Microstructures arise from a balance of local sedimentation equilibria within potential energy features and a tunable pairwise depletion attraction between colloids. Transient colloidal crystal self-assembly occurred via a quasiequilibrium process as characterized by continuously evolving spatial profiles of local density, bond orientational order, and self-diffusivities. (C) 2009 American Institute of Physics. [doi:10.1063/1.3243686]
Keywords:
LENNARD-JONES SYSTEM
POLYMER MIXTURES
PHASE-BEHAVIOR
2 DIMENSIONS
DISPERSIONS
CRYSTALLIZATION
SUSPENSIONS
NUCLEATION
SIMULATION
Journal
IF:
3.1
Papers:
7.2W
Citations:
23.2W