Breakdown of Dynamic Scaling in Thin Film Binary Liquids Undergoing Phase Separation

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Chung, Hyun-joong
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The kinetics of phase separation in thin polymer blend films displaying discrete and bicontinuous domain morphologies are examined. For discrete domains, the correlation length ξ grows as t1/3, in agreement with a coalescence model. By plotting ξ/d vs t/ti (initiation time), universal growth behavior is obtained for thickness values (d) from 1000 to 190 nm. In contrast, bicontinuous domains grow with a decreasing exponent, 0.62 to 0.28, as d decreases from 900 to 90 nm (i.e., no universal growth). This slowing down with reduced dimensionality suggests suppression of lateral hydrodynamic pumping.

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2004-05-06
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Copyright American Physical Society. Reprinted from Physical Review Letters, Volume 92, Issue 18, Article 185704, May 2004, 4 pages. Publisher URL: http://dx.doi.org/10.1103/PhysRevLett.92.185704
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