Journal
NANO LETTERS
Volume 15, Issue 8, Pages 5221-5228Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b01463
Keywords
Block copolymer; self-assembly; nonequilibrium; shear; photothermal
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Funding
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-SC0012704]
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Block copolymers spontaneously form well-defined nanoscale morphologies during thermal annealing. Yet, the structures one obtains can be influenced by nonequilibrium effects, including processing history or pathway-dependent assembly. Here, we explore various pathways, for ordering of block copolymer thin films, using oven-annealing, as well as newly disclosed methods for rapid photothermal annealing and photothermal shearing. We report the discovery of an efficient pathway for ordering self-assembled films: ultrarapid shearing of as-cast films induces latent alignment in the disordered morphology. Subsequent thermal processing can then develop this directly into a uniaxially aligned morphology with low defect density. This deeper understanding of pathway-dependence may have broad implications in self-assembly.
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