The molecular dynamics of nematic liquid crystal confined in porous membranes treated by different surfactants

被引:1
|
作者
Rozanski, S. A. [1 ]
机构
[1] Stanislaw Staszic Univ Appl Sci Pila, 10 Podchorazych St, PL-64920 Pila, Poland
关键词
Dielectric spectroscopy; Molecular dynamics; Confinement; Nematic liquid crystal; Porous membranes; Surfactants; PHASE-TRANSITIONS; RELAXATION; ORDER; BEHAVIOR; MODES;
D O I
10.1016/j.opelre.2019.11.004
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The molecular dynamics of the well-known nematic liquid crystal 4-n-pentyl-4'-cyanobiphenyl geometrically restricted in Anopore and Synpor porous membranes with various pore structure and treated by different surfactants (namely decanoic acid and lecithin) is compared. In the Anopore membrane the chosen surfactants induce the homeotropic orientation of the molecules on the walls of the cylindrical pores and observed corresponding relaxation processes (librational modes) are practically the same. The dielectric measurements of lecithin treated Synpor membranes reveals the reorientation of the molecules from planar to homeotropic on the complex multilayer structure present in their volume. The dielectric strengths of the observed two molecular processes (delta-process and librational mode) are inversed in the ratio compared to the untreated membranes. The observed differences in molecular dynamics results from the orientation of the liquid crystal molecules in untreated and treated membranes and the structure of the membranes themselves. (C) 2019 Association of Polish Electrical Engineers (SEP). Published by Elsevier B.V. All rights reserved.
引用
收藏
页码:339 / 344
页数:6
相关论文
共 50 条
  • [1] Dynamics of molecular motion of nematic liquid crystal confined in cylindrical pores
    Batalla, B
    Sinha, G
    Aliev, F
    MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 1999, 331 : 1981 - 1988
  • [2] Dielectric relaxation of nematic liquid crystal confined in porous matrices
    Sinha, GP
    Aliev, FM
    MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 1997, 304 : 309 - 314
  • [3] The dielectric properties of nematic liquid crystal 5CB confined to treated and untreated anopore membranes
    Rozanski, SA
    Kremer, F
    Groothues, H
    Stannarius, R
    MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 1997, 303 : 319 - 324
  • [4] Determination of the order parameter in nematic liquid crystal confined to anopore membranes
    Rozanski, SA
    Kremer, F
    Stannarius, R
    Groothues, H
    DIELECTRIC AND RELATED PHENOMENA: MATERIALS PHYSICO-CHEMISTRY, SPECTROMETRIC INVESTIGATIONS, AND APPLICATIONS, 1997, 3181 : 119 - 122
  • [5] Dielectric spectroscopy of nematic liquid crystal confined in random porous matrices
    Aliev, FM
    Sinha, GP
    ELECTRICALLY BASED MICROSTRUCTURAL CHARACTERIZATION, 1996, 411 : 413 - 418
  • [6] Slow molecular processes in a nematic liquid crystal confined to random porous network formed by aerosil particles
    Rajeswari, M.
    Dhara, S.
    Venu, K.
    Sastry, V. S. S.
    Dabrowski, R.
    PHASE TRANSITIONS, 2012, 85 (04) : 322 - 336
  • [7] Dynamics of librational mode of nematic liquid crystal confined in cylindrical pores
    Nazario, Z
    Sinha, G
    Aliev, F
    MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 2001, 367 : 3121 - 3128
  • [8] Orientational order and dynamics of a nematic liquid crystal in porous media
    Fehr, C
    Goze-Bac, C
    Anglaret, E
    Benoit, C
    Hasmy, A
    EUROPHYSICS LETTERS, 2006, 73 (04): : 553 - 559
  • [9] Polarizing Optical Microscopic Characterization of Nematic Liquid Crystal Confined in Porous Silicon
    Huang, Yuan Ming
    Ma, Qing-lan
    Zhai, Bao-gai
    LIQUID CRYSTALS AND RELATED MATERIALS II, 2012, 181-182 : 83 - 87
  • [10] Influence of surfactants in nematic liquid crystal droplets
    Hirankittiwong, Pemika
    Thongta, Jirote
    Hongkanchanakul, Natthawat
    Chattham, Nattaporn
    MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 2024, 768 (18) : 1129 - 1136