X-RAY REFLECTIVITY MEASUREMENTS AND LANDAU THEORY OF SMECTIC WETTING IN LIQUID CRYSTAL-BENZYL ALCOHOL MIXTURES

被引:37
作者
KELLOGG, GJ
PERSHAN, PS
KAWAMOTO, EH
FOSTER, WF
DEUTSCH, M
OCKO, BM
机构
[1] HARVARD UNIV,DEPT PHYS,CAMBRIDGE,MA 02138
[2] HARVARD UNIV,DIV APPL SCI,CAMBRIDGE,MA 02138
[3] BAR ILAN UNIV,DEPT PHYS,IL-52100 RAMAT GAN,ISRAEL
[4] BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973
来源
PHYSICAL REVIEW E | 1995年 / 51卷 / 05期
关键词
D O I
10.1103/PhysRevE.51.4709
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
Smectic layering has been observed at the free surface of decylcyanobiphenyl (10CB) and dodecylcyanobiphenyl (12CB) and mixtures of 10CB and 12CB with benzyl alcohol (BA). The effect of BA is to suppress the bulk isotropic-smectic transition temperature TIA and surface layer ''transition'' temperatures Tj, as well as sharpening these surface transitions by reducing the temperature range ΔT over which layers grow. The observed sharpening appears to saturate for concentrations x0.118. A Landau theory for the growth of a single layer j has been developed, in which the free energy contains a term coupling the concentration x to the local smectic order parameter ψj such that Fj∼xψj2. Applying this theory to pure 12CB and eight mixtures of 12CB-BA, we find that the j=1->j=2 transition is continuous in pure 12CB, but that the addition of small amounts of impurity drives the transition first order. © 1995 The American Physical Society.
引用
收藏
页码:4709 / 4726
页数:18
相关论文
共 45 条
  • [1] ADAMSON AW, 1990, PHYSICAL CHEM SURFAC
  • [2] SMECTIC-A ORDER AT THE SURFACE OF A NEMATIC LIQUID-CRYSTAL - SYNCHROTRON X-RAY-DIFFRACTION
    ALSNIELSEN, J
    CHRISTENSEN, F
    PERSHAN, PS
    [J]. PHYSICAL REVIEW LETTERS, 1982, 48 (16) : 1107 - 1110
  • [3] THICKNESS OF FLUID INTERFACES NEAR THE CRITICAL-POINT FROM OPTICAL REFLECTIVITY MEASUREMENTS
    BEYSENS, D
    ROBERT, M
    [J]. JOURNAL OF CHEMICAL PHYSICS, 1987, 87 (05) : 3056 - 3061
  • [4] 3D XY BEHAVIOR OF A NEMATIC-SMECTIC-A PHASE-TRANSITION - CONFIRMATION OF THE DEGENNES MODEL
    BOUWMAN, WG
    DEJEU, WH
    [J]. PHYSICAL REVIEW LETTERS, 1992, 68 (06) : 800 - 803
  • [5] CAPILLARY WAVES ON THE SURFACE OF SIMPLE LIQUIDS MEASURED BY X-RAY REFLECTIVITY
    BRASLAU, A
    PERSHAN, PS
    SWISLOW, G
    OCKO, BM
    ALSNIELSEN, J
    [J]. PHYSICAL REVIEW A, 1988, 38 (05): : 2457 - 2470
  • [6] BRASLAU A, 1988, THESIS HARVARD U
  • [7] DYNAMICAL TEST OF PHASE-TRANSITION ORDER
    CLADIS, PE
    VANSAARLOOS, W
    HUSE, DA
    PATEL, JS
    GOODBY, JW
    FINN, PL
    [J]. PHYSICAL REVIEW LETTERS, 1989, 62 (15) : 1764 - 1767
  • [8] ANALOGY BETWEEN SUPERCONDUCTORS AND SMECTICS-A
    DEGENNES, PG
    [J]. SOLID STATE COMMUNICATIONS, 1972, 10 (09) : 753 - &
  • [9] FINITE-SIZE EFFECTS IN FLUID INTERFACES
    GELFAND, MP
    FISHER, ME
    [J]. PHYSICA A, 1990, 166 (01): : 1 - 74
  • [10] GRAMSBERGEN EF, 1988, J PHYS-PARIS, V49, P363, DOI 10.1051/jphys:01988004902036300