A specialized apparatus for the study of liquid crystals at high pressures

C. Carboni, H. F. Gleeson, J. W. Goodby, A. J. Slaney

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A pressure system specially designed for the study of liquid crystal materials at high pressures up to 4kbar is presented. The pressure system is based on a hydrostatic screw injector and uses either oil or gas as the pressure transmitting medium. The type of measurements which can be performed with the instrument include polarized microscopy, optical spectroscopy, electrooptic and electrical measurements. The different measurements performed place specific constraints on the design of the apparatus and the pressure cells, and details are given. A preliminary study of the smectic A modification of the twist grain boundary phase (TGBA) at high pressures is presented. The pressure versus temperature phase diagram shows (i) a negative gradient of the TGBA/isotropic phase boundary line and (ii) that the TGBA phase does not exist at pressures above about 250 bar. Following Lubensky’s analogy between the TGBA phase and type II superconductors, the disappearance of the TGBA phase at high pressure may imply that the Landau-Ginsburg parameter K decreases with pressure.

Original languageEnglish
Pages (from-to)1991-2000
Number of pages10
JournalLiquid Crystals
Volume14
Issue number6
DOIs
Publication statusPublished - 1993

Fingerprint

Liquid Crystals
Liquid crystals
liquid crystals
grain boundaries
Grain boundaries
screws
hydrostatics
injectors
electrical measurement
electro-optics
oils
Phase boundaries
phase diagrams
Electrooptical effects
microscopy
Superconducting materials
Phase diagrams
gradients
Microscopic examination
Oils

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

A specialized apparatus for the study of liquid crystals at high pressures. / Carboni, C.; Gleeson, H. F.; Goodby, J. W.; Slaney, A. J.

In: Liquid Crystals, Vol. 14, No. 6, 1993, p. 1991-2000.

Research output: Contribution to journalArticle

Carboni, C. ; Gleeson, H. F. ; Goodby, J. W. ; Slaney, A. J. / A specialized apparatus for the study of liquid crystals at high pressures. In: Liquid Crystals. 1993 ; Vol. 14, No. 6. pp. 1991-2000.
@article{cb31afd578174b6cb9fb362078516c26,
title = "A specialized apparatus for the study of liquid crystals at high pressures",
abstract = "A pressure system specially designed for the study of liquid crystal materials at high pressures up to 4kbar is presented. The pressure system is based on a hydrostatic screw injector and uses either oil or gas as the pressure transmitting medium. The type of measurements which can be performed with the instrument include polarized microscopy, optical spectroscopy, electrooptic and electrical measurements. The different measurements performed place specific constraints on the design of the apparatus and the pressure cells, and details are given. A preliminary study of the smectic A modification of the twist grain boundary phase (TGBA) at high pressures is presented. The pressure versus temperature phase diagram shows (i) a negative gradient of the TGBA/isotropic phase boundary line and (ii) that the TGBA phase does not exist at pressures above about 250 bar. Following Lubensky’s analogy between the TGBA phase and type II superconductors, the disappearance of the TGBA phase at high pressure may imply that the Landau-Ginsburg parameter K decreases with pressure.",
author = "C. Carboni and Gleeson, {H. F.} and Goodby, {J. W.} and Slaney, {A. J.}",
year = "1993",
doi = "10.1080/02678299308027735",
language = "English",
volume = "14",
pages = "1991--2000",
journal = "Liquid Crystals",
issn = "0267-8292",
publisher = "Taylor and Francis Ltd.",
number = "6",

}

TY - JOUR

T1 - A specialized apparatus for the study of liquid crystals at high pressures

AU - Carboni, C.

AU - Gleeson, H. F.

AU - Goodby, J. W.

AU - Slaney, A. J.

PY - 1993

Y1 - 1993

N2 - A pressure system specially designed for the study of liquid crystal materials at high pressures up to 4kbar is presented. The pressure system is based on a hydrostatic screw injector and uses either oil or gas as the pressure transmitting medium. The type of measurements which can be performed with the instrument include polarized microscopy, optical spectroscopy, electrooptic and electrical measurements. The different measurements performed place specific constraints on the design of the apparatus and the pressure cells, and details are given. A preliminary study of the smectic A modification of the twist grain boundary phase (TGBA) at high pressures is presented. The pressure versus temperature phase diagram shows (i) a negative gradient of the TGBA/isotropic phase boundary line and (ii) that the TGBA phase does not exist at pressures above about 250 bar. Following Lubensky’s analogy between the TGBA phase and type II superconductors, the disappearance of the TGBA phase at high pressure may imply that the Landau-Ginsburg parameter K decreases with pressure.

AB - A pressure system specially designed for the study of liquid crystal materials at high pressures up to 4kbar is presented. The pressure system is based on a hydrostatic screw injector and uses either oil or gas as the pressure transmitting medium. The type of measurements which can be performed with the instrument include polarized microscopy, optical spectroscopy, electrooptic and electrical measurements. The different measurements performed place specific constraints on the design of the apparatus and the pressure cells, and details are given. A preliminary study of the smectic A modification of the twist grain boundary phase (TGBA) at high pressures is presented. The pressure versus temperature phase diagram shows (i) a negative gradient of the TGBA/isotropic phase boundary line and (ii) that the TGBA phase does not exist at pressures above about 250 bar. Following Lubensky’s analogy between the TGBA phase and type II superconductors, the disappearance of the TGBA phase at high pressure may imply that the Landau-Ginsburg parameter K decreases with pressure.

UR - http://www.scopus.com/inward/record.url?scp=0003573950&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0003573950&partnerID=8YFLogxK

U2 - 10.1080/02678299308027735

DO - 10.1080/02678299308027735

M3 - Article

AN - SCOPUS:0003573950

VL - 14

SP - 1991

EP - 2000

JO - Liquid Crystals

JF - Liquid Crystals

SN - 0267-8292

IS - 6

ER -