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- W2028771715 abstract "Symmetric diblock copolymers undergo a weakly first-order microphase separation transition to a lamellar phase. In a thin film of thickness d this transition is altered for two reasons: the film geometry imposes commensurability restrictions on the concentration profiles, and the surface field favors one of the two blocks. The latter effect dominates for d>ensuremath{xi}, where ensuremath{xi} is the correlation length near ${mathit{T}}_{mathit{c}}$. We construct a wetting Hamiltonian, in which the slowly varying amplitude ensuremath{psi}(z) of the composition c(z)=2ensuremath{psi}(z)cos(${mathit{q}}_{0}$z) is the order parameter, and explore the changes in the profile induced by changes in temperature, surface field, and d/ensuremath{xi}. The resulting phase diagram exhibits a line of first-order prewetting transitions ending in a critical point, and a capillary condensation transition to an ordered film. Turning to commensurability effects, we compute the ranges of thickness near half-integer numbers of layers for which the free surface of a copolymer film is unstable to capillary waves, analogous to spinodal decomposition in two dimensions. textcopyright{} 1996 The American Physical Society." @default.
- W2028771715 created "2016-06-24" @default.
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- W2028771715 date "1996-10-01" @default.
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- W2028771715 title "Wetting description of block copolymer thin films" @default.
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- W2028771715 doi "https://doi.org/10.1103/physreve.54.3793" @default.
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