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• W2073879905 startingPage "4305" @default.
• W2073879905 abstract "We present the results of a systematic ac calorimetric study on the smectic-$A$ to nematic ($mathrm{Sm}ensuremath{-}A--N$) phase transition for the alkylcyanobiphenyl liquid crystals, 8CB and 9CB, imbedded in the randomly interconnected voids of Millipore cellulose membranes. The confining void size ranged from 5 to 0.025 ensuremath{mu}m, which, although large, introduces substantial changes compared to the bulk behavior. The heat capacity peak at the $mathrm{Sm}ensuremath{-}A--N$ transition temperature changes from sharp and prominent to broad and small with increased confinement. Concomitant with the heat capacity peak shape change, critical behavior analysis reveals that the random confinement drives the heat capacity critical exponent from its bulk value towards zero, approaching the three-dimensional $mathrm{XY}$ universality class value prediction of $ensuremath{-}0.007.$ This change in the critical exponent is liquid-crystal material and voids size dependent, and is equivalent to what occurs with increasing nematic range that weakens the coupling between smectic and nematic order parameters. The Millipore confinement does not alter the nematic range; it is the randomness it introduces that changes the nature of the coupling. In addition, but in a manner not fully consistent with finite size effects, transition temperatures are shifted down from bulk and the transition enthalpy is suppressed. Supporting results are found in a study of binary mixtures of 9CB and 10CB." @default.
• W2073879905 created "2016-06-24" @default.
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• W2073879905 creator A5018809170 @default.
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• W2073879905 date "1998-04-01" @default.
• W2073879905 modified "2023-09-25" @default.
• W2073879905 title "Critical behavior of a smectic-<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>A</mml:mi></mml:math>to nematic phase transition imbedded in a random network of voids" @default.
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• W2073879905 doi "https://doi.org/10.1103/physreve.57.4305" @default.
• W2073879905 hasPublicationYear "1998" @default.
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