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
No Thumbnail Available
Authors
Lin, Zhiqun
Authors
Advisors
Advisors
Associated Organizations
Organizational Unit
Series
Series
Collections
Supplementary to
Permanent Link
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.
Sponsor
Date Issued
2015-10-14
Extent
56:27 minutes
Resource Type
Moving Image
Resource Subtype
Lecture