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    Spontaneous planarization of nanoscale phase separated thin film

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    Downloads: 268
    Date
    2002-06-01
    Author
    Saraf, Ravi F.
    Niu, S.
    Stumb, Eric
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    Abstract
    Structure of complex fluid at mesoscales is influenced by interfacial effects. We describe the dynamic response in such films to sudden change in interfacial tension. In a self-assembled block copolymer film, the monolayer of 15 nm diam cylindrical discrete phases close to the surface commence to sink at an average rate of 0.16 nm/day in response to the interfacial tension change. Surprisingly, this spontaneous planarization occurs, even though the cylinders are covalently stitched to the matrix. A simple model explains the observed behavior. The observation may lead to approaches to tailor the structure of mesoscale thin films of complex fluids for long-range order that are desirable for nanoscale device fabrication. (C) 2002 American Institute of Physics.
    URI
    http://hdl.handle.net/10919/25276
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    • Scholarly Works, Chemical Engineering [141]

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