Viscosity coefficients of nematic liquid crystals: I. Oscillating plate viscometer measurements and rotational viscosity measurements: K15

Robert Orr, R. A. Pethrick

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Improvements in the oscillating plate and rotational viscosity measurements are described and data presented for 4-n-pentyl-4-cyanobiphenyl (K15). The influence of the magnitude of the magnetic field on the viscosity coefficients is explored and the limiting field which has to be achieved for field-independent values is identified. The field dependence of the viscosity coefficients is compared with theoretical prediction. Comparison of this data with earlier measurements indicates the limitations of the use of lower field strengths. Combining the data from the measured viscosities, the Leslie–Ericksen coefficients are calculated.
LanguageEnglish
Pages1169-1181
Number of pages13
JournalLiquid Crystals
Volume38
Issue number9
Early online date9 Sep 2011
DOIs
Publication statusPublished - 2011

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viscometers
Viscometers
Nematic liquid crystals
Viscosity measurement
liquid crystals
Viscosity
viscosity
coefficients
Magnetic fields
field strength
predictions
magnetic fields

Keywords

  • 4-n-pentyl-4 -cyanobiphenyl
  • rotational viscosity measurements
  • shear viscosity
  • Leslie-Ericksen coefficients
  • oscillating plate viscometer

Cite this

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title = "Viscosity coefficients of nematic liquid crystals: I. Oscillating plate viscometer measurements and rotational viscosity measurements: K15",
abstract = "Improvements in the oscillating plate and rotational viscosity measurements are described and data presented for 4-n-pentyl-4-cyanobiphenyl (K15). The influence of the magnitude of the magnetic field on the viscosity coefficients is explored and the limiting field which has to be achieved for field-independent values is identified. The field dependence of the viscosity coefficients is compared with theoretical prediction. Comparison of this data with earlier measurements indicates the limitations of the use of lower field strengths. Combining the data from the measured viscosities, the Leslie–Ericksen coefficients are calculated.",
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Viscosity coefficients of nematic liquid crystals : I. Oscillating plate viscometer measurements and rotational viscosity measurements: K15. / Orr, Robert; Pethrick, R. A.

In: Liquid Crystals, Vol. 38, No. 9, 2011, p. 1169-1181.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Viscosity coefficients of nematic liquid crystals

T2 - Liquid Crystals

AU - Orr, Robert

AU - Pethrick, R. A.

PY - 2011

Y1 - 2011

N2 - Improvements in the oscillating plate and rotational viscosity measurements are described and data presented for 4-n-pentyl-4-cyanobiphenyl (K15). The influence of the magnitude of the magnetic field on the viscosity coefficients is explored and the limiting field which has to be achieved for field-independent values is identified. The field dependence of the viscosity coefficients is compared with theoretical prediction. Comparison of this data with earlier measurements indicates the limitations of the use of lower field strengths. Combining the data from the measured viscosities, the Leslie–Ericksen coefficients are calculated.

AB - Improvements in the oscillating plate and rotational viscosity measurements are described and data presented for 4-n-pentyl-4-cyanobiphenyl (K15). The influence of the magnitude of the magnetic field on the viscosity coefficients is explored and the limiting field which has to be achieved for field-independent values is identified. The field dependence of the viscosity coefficients is compared with theoretical prediction. Comparison of this data with earlier measurements indicates the limitations of the use of lower field strengths. Combining the data from the measured viscosities, the Leslie–Ericksen coefficients are calculated.

KW - 4-n-pentyl-4 -cyanobiphenyl

KW - rotational viscosity measurements

KW - shear viscosity

KW - Leslie-Ericksen coefficients

KW - oscillating plate viscometer

U2 - 10.1080/02678292.2011.602121

DO - 10.1080/02678292.2011.602121

M3 - Article

VL - 38

SP - 1169

EP - 1181

JO - Liquid Crystals

JF - Liquid Crystals

SN - 0267-8292

IS - 9

ER -