QUANTITATIVE PHOTOACOUSTIC DEPTH PROFILOMETRY OF MAGNETIC FIELD-INDUCED THERMAL-DIFFUSIVITY INHOMOGENEITY IN THE LIQUID-CRYSTAL OCTYLCYANOBIPHENYL

被引：29

作者：

MANDELIS, A

SCHOUBS, E

PARALTA, SB

THOEN, J

机构：

[1] UNIV TORONTO,PHOTOACOUST & PHOTOTHERMAL SCI LAB,TORONTO M5S 1A4,ONTARIO,CANADA

[2] UNIV TORONTO,ONTARIO LASER & LIGHTWAVE RES CTR,DEPT MECH ENGN,TORONTO M5S 1A4,ONTARIO,CANADA

来源：

JOURNAL OF APPLIED PHYSICS | 1991年 / 70卷 / 03期

关键词：

D O I：

10.1063/1.349492

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

An observed change in the photoacoustic signal frequency response upon the application of a transverse magnetic field across octylcyanobiphenyl samples in the nematic phase at 37-degrees-C and 37.5-degrees-C is reported. The application of a recent thermal-wave theory developed for depth profiling of continuously inhomogeneous condensed phases has given quantitative profiles of thermal diffusivity decreases extending to 20-30-mu-m below the liquid crystal surface. These decaying depth profiles are qualitatively consistent with earlier photoacoustic temperature scans of liquid crystals and are a measure of the extent of bulk reorientational effects due to the magnetic field, as well as the extent of the influence of the surface as a domain reorientation inhibitor in the KG range.

引用

页码：1771 / 1777

页数：7

共 22 条

[1] HEAT PULSE METHOD FOR DETERMINATION OF THERMAL-DIFFUSIVITY OF LIQUID-CRYSTALS
AKAHANE, T
KONDOH, M
HASHIMOTO, K
NAKAGAWA, M
[J]. JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, 1987, 26 (06): : L1000 - L1003
[2] DEGENNES PG, 1974, PHYSICS LIQUID CRYST
[3] STUDIES OF DEFECT STRUCTURE EFFECTS ON THE TRANSPORT-PROPERTIES OF PURE CRYSTALLINE N-CDS VIA THE TEMPERATURE-DEPENDENCE OF PHOTOACOUSTIC AND PHOTOCURRENT SPECTRA
DIOSZEGHY, T
MANDELIS, A
[J]. JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1986, 47 (12) : 1115 - 1128
[4] FAGARD V, 1990, THESIS KATHOLIEKE U, pCH2
[5] PHOTOACOUSTIC CHARACTERIZATION OF LIQUID-CRYSTAL PHASE-TRANSITIONS
GLORIEUX, C
SCHOUBS, E
THOEN, J
[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1989, 122 (01): : 87 - 91
[6] GLORIEUX C, 1990, PHOTOACOUSTIC PHOTOT, V2, P297
[7] CALORIMETRIC STUDY OF THE SMECTIC-A-HEXATIC-B PHASE-TRANSITION OF A LIQUID-CRYSTAL BINARY MIXTURE
HUANG, CC
NOUNESIS, G
GEER, R
GOODBY, JW
GUILLON, D
[J]. PHYSICAL REVIEW A, 1989, 39 (07): : 3741 - 3744
[8] STUDY OF THIN SMECTIC-A SAMPLES BY A PHOTOACOUSTIC TECHNIQUE
LOUIS, G
PERETTI, P
BILLARD, J
MANGEOT, B
[J]. CANADIAN JOURNAL OF PHYSICS, 1986, 64 (09) : 1230 - 1233
[9] PHOTOACOUSTIC FREQUENCY-DOMAIN DEPTH PROFILING OF CONTINUOUSLY INHOMOGENEOUS CONDENSED PHASES - THEORY AND SIMULATIONS FOR THE INVERSE PROBLEM
MANDELIS, A
PERALTA, SB
THOEN, J
[J]. JOURNAL OF APPLIED PHYSICS, 1991, 70 (03) : 1761 - 1770
[10] PHOTOPYROELECTRIC SPECTROSCOPY OF ALPHA-SI-H THIN SEMICONDUCTING-FILMS ON QUARTZ
MANDELIS, A
WAGNER, RE
GHANDI, K
BALTMAN, R
DAO, P
[J]. PHYSICAL REVIEW B, 1989, 39 (08): : 5254 - 5260

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