A Novel Esr Approach to Accurately Probe Transition Temperatures in Liquid Crystalline Systems

G. A. Oweimreen; M. A. Morsy; J. S. Hwang

doi:10.1080/10587259508041692

A Novel Esr Approach to Accurately Probe Transition Temperatures in Liquid Crystalline Systems

G. A. Oweimreen
, M. A. Morsy
, J. S. Hwang

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

Using the spin probe predeuterated-2, 2, 6, 6-tetramethyl-,4-piperidone-N-oxide (PD-Tempone) at mole fractions about 10”5 the transition temperatures of 'pure' 4-cyano-4'-n-pentylbiphenyl (5CB) and four dilute solutions of 3,3-diethylpentane (Et4C) at mole fractions between 0.02 and 0.08 in 5CB were determined. This fast approach relies on the smaller coupling constant obtained for the spin probe in the orientationaly ordered nematic phase relative to the isotropic phase. Using an especially designed sample holder in conjunction with a temperature control and monitoring system the temperatures of our samples were controlled to within + 0.02 °C. The results were used to obtain the phase diagram for the 5CB-Et4C system in the concentration range studied.

Original language	English
Pages (from-to)	197-208
Number of pages	12
Journal	Molecular Crystals and Liquid Crystals Science and Technology, Section A: Molecular Crystals and Liquid Crystals
Volume	265
Issue number	1
DOIs	https://doi.org/10.1080/10587259508041692
State	Published - 1 Jun 1995

Bibliographical note

Funding Information:
This research was supported by King Fahd University of Petroleum and minerals.

ASJC Scopus subject areas

Condensed Matter Physics

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10.1080/10587259508041692

Cite this

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title = "A Novel Esr Approach to Accurately Probe Transition Temperatures in Liquid Crystalline Systems",

abstract = "Using the spin probe predeuterated-2, 2, 6, 6-tetramethyl-,4-piperidone-N-oxide (PD-Tempone) at mole fractions about 10”5 the transition temperatures of 'pure' 4-cyano-4'-n-pentylbiphenyl (5CB) and four dilute solutions of 3,3-diethylpentane (Et4C) at mole fractions between 0.02 and 0.08 in 5CB were determined. This fast approach relies on the smaller coupling constant obtained for the spin probe in the orientationaly ordered nematic phase relative to the isotropic phase. Using an especially designed sample holder in conjunction with a temperature control and monitoring system the temperatures of our samples were controlled to within + 0.02 °C. The results were used to obtain the phase diagram for the 5CB-Et4C system in the concentration range studied.",

author = "Oweimreen, \{G. A.\} and Morsy, \{M. A.\} and Hwang, \{J. S.\}",

note = "Funding Information: This research was supported by King Fahd University of Petroleum and minerals.",

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doi = "10.1080/10587259508041692",

language = "English",

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T1 - A Novel Esr Approach to Accurately Probe Transition Temperatures in Liquid Crystalline Systems

AU - Oweimreen, G. A.

AU - Morsy, M. A.

AU - Hwang, J. S.

N1 - Funding Information: This research was supported by King Fahd University of Petroleum and minerals.

PY - 1995/6/1

Y1 - 1995/6/1

N2 - Using the spin probe predeuterated-2, 2, 6, 6-tetramethyl-,4-piperidone-N-oxide (PD-Tempone) at mole fractions about 10”5 the transition temperatures of 'pure' 4-cyano-4'-n-pentylbiphenyl (5CB) and four dilute solutions of 3,3-diethylpentane (Et4C) at mole fractions between 0.02 and 0.08 in 5CB were determined. This fast approach relies on the smaller coupling constant obtained for the spin probe in the orientationaly ordered nematic phase relative to the isotropic phase. Using an especially designed sample holder in conjunction with a temperature control and monitoring system the temperatures of our samples were controlled to within + 0.02 °C. The results were used to obtain the phase diagram for the 5CB-Et4C system in the concentration range studied.

AB - Using the spin probe predeuterated-2, 2, 6, 6-tetramethyl-,4-piperidone-N-oxide (PD-Tempone) at mole fractions about 10”5 the transition temperatures of 'pure' 4-cyano-4'-n-pentylbiphenyl (5CB) and four dilute solutions of 3,3-diethylpentane (Et4C) at mole fractions between 0.02 and 0.08 in 5CB were determined. This fast approach relies on the smaller coupling constant obtained for the spin probe in the orientationaly ordered nematic phase relative to the isotropic phase. Using an especially designed sample holder in conjunction with a temperature control and monitoring system the temperatures of our samples were controlled to within + 0.02 °C. The results were used to obtain the phase diagram for the 5CB-Et4C system in the concentration range studied.

UR - https://www.scopus.com/pages/publications/84972927933

U2 - 10.1080/10587259508041692

DO - 10.1080/10587259508041692

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AN - SCOPUS:84972927933

SN - 1058-725X

VL - 265

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EP - 208

JO - Molecular Crystals and Liquid Crystals Science and Technology, Section A: Molecular Crystals and Liquid Crystals

JF - Molecular Crystals and Liquid Crystals Science and Technology, Section A: Molecular Crystals and Liquid Crystals

IS - 1

ER -

A Novel Esr Approach to Accurately Probe Transition Temperatures in Liquid Crystalline Systems

Abstract

Bibliographical note

ASJC Scopus subject areas

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