Title:
Learning From "Coffee Rings": Ordered Structures Crafted by Controlled Evaporative Self‐Assembly and Flow‐Enabled Self‐Assembly
Learning From "Coffee Rings": Ordered Structures Crafted by Controlled Evaporative Self‐Assembly and Flow‐Enabled Self‐Assembly
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Author(s)
Lin, Zhiqun
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Abstract
Self-assembly of micro- and nano-scale materials to form well-ordered structures
promises new opportunities for developing miniaturized electronic, optoelectronic, and magnetic
devices. In this regard, several elegant methods based upon self-assembly have emerged, for
example, self-directed self-assembly and electrostatic self-assembly. Dynamic self-assembly of
nonvolatile solutes via irreversible solvent evaporation has been recognized as an extremely simJ
route to intriguing structures. However, these dissipative structures are often randomly organized
this presentation, I will show two simple yet robust techniques based on very familiar "coffee ring''
phenomena to produce a large variety of intriguing structures (e.g., concentric rings, fingers, spo~
squares, triangular contour lines, ellipses, etc.) consisting of polymers or nanocrystals (NCs) with
unprecedented regularity by allowing a drop of polymer or NC solution to evaporate in curve-on-fl
geometries and two-parallel-plate geometry, respectively. These techniques, which dispense with
need for lithography and external fields, are fast and cost-effective. As such, they represent powe
strategies for creating highly structured, multifunctional materials and devices.
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Date Issued
2015-10-14
Extent
56:27 minutes
Resource Type
Moving Image
Resource Subtype
Lecture