Nematic-smectic-A phase transition in porous media

被引：15
|
作者：
Popa-Nita, V
Romano, S
机构：
[1] Univ Pavia, Ist Nazl Fis Mat, I-27100 Pavia, Italy
[2] Univ Pavia, Dipartimento Fis A Volta, I-27100 Pavia, Italy
[3] Univ Bucharest, Fac Phys, Bucharest 76900, Romania
来源：
CHEMICAL PHYSICS | 2001年 / 264卷 / 01期
关键词：
D O I：
10.1016/S0301-0104(00)00340-2
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We study the effects of both orientational and translational disorder on the nematic-smectic-A (NA) phase transition, using the Landau-de Gennes treatment. The only influence of random-field orientational disorder is to slightly increase the NA transition temperature, whereas the translational randomness has four important effects. (i) The NA transition temperature is decreased by the randomness. (ii) The bulk second-order NA phase transition is transformed into a first-order one. (iii) There is a small degree of translational order even in the high-temperature phase. (iv) The strict long-range smectic-A order is converted into a quasi-long-range order by any finite amount of disorder. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：91 / 99
页数：9
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