Molecular orientation and dielectric anisotropy properties of 4-cyano-4′-n-heptylbiphenyl-TiO2 liquid crystal composite

M. Okutan; F. Yakuphanoglu; O. Köysal; S. E. San; G. A. Oweimreen

doi:10.1016/j.jnoncrysol.2008.03.036

Molecular orientation and dielectric anisotropy properties of 4-cyano-4′-n-heptylbiphenyl-TiO₂ liquid crystal composite

M. Okutan^*
, F. Yakuphanoglu
, O. Köysal
, S. E. San
, G. A. Oweimreen

^*Corresponding author for this work

King Fahd University of Petroleum & Minerals

Research output: Contribution to journal › Review article › peer-review

9 Scopus citations

Abstract

The molecular orientation and the dielectric anisotropy of the nematic liquid crystal (LC) 4-cyano-4′-n-heptylbiphenyl (7CB) and of TiO₂-doped 7CB have been investigated. The dielectric properties of the LCs exhibit a relaxation peak that shifts to lower frequencies with increasing voltages. The relaxation frequencies of 7CB and 7CB/TiO₂ liquid crystals were calculated and found to decrease as the bias voltage increases. This is attributed to molecular reorientation. The dielectric anisotropy of the LCs changes from the positive type to negative type and the static electric permittivity and dielectric anisotropy values were found to be lower for the 7CB/TiO₂ system.

Original language	English
Pages (from-to)	3529-3532
Number of pages	4
Journal	Journal of Non-Crystalline Solids
Volume	354
Issue number	30
DOIs	https://doi.org/10.1016/j.jnoncrysol.2008.03.036
State	Published - 15 Jul 2008

Bibliographical note

Funding Information:
This work was partially supported by The Management Unit of Scientific Research Projects of Firat University (FÜ BAP) under Project 1230 and Turkish Scientific and Technical Research Council (TUBITAK) via Grant No. TBAG-2400(103T186). Also, one of us, GAO, acknowledges support from King Fahd University of Petroleum and Minerals.

Keywords

Dielectric properties, relaxation, electric modulus
Liquid crystals and molecular liquids

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Materials Chemistry

Access to Document

10.1016/j.jnoncrysol.2008.03.036

Cite this

@article{fe78bf258d9d4d1eb7182c7b55e2f51b,

title = "Molecular orientation and dielectric anisotropy properties of 4-cyano-4′-n-heptylbiphenyl-TiO2 liquid crystal composite",

abstract = "The molecular orientation and the dielectric anisotropy of the nematic liquid crystal (LC) 4-cyano-4′-n-heptylbiphenyl (7CB) and of TiO2-doped 7CB have been investigated. The dielectric properties of the LCs exhibit a relaxation peak that shifts to lower frequencies with increasing voltages. The relaxation frequencies of 7CB and 7CB/TiO2 liquid crystals were calculated and found to decrease as the bias voltage increases. This is attributed to molecular reorientation. The dielectric anisotropy of the LCs changes from the positive type to negative type and the static electric permittivity and dielectric anisotropy values were found to be lower for the 7CB/TiO2 system.",

keywords = "Dielectric properties, relaxation, electric modulus, Liquid crystals and molecular liquids",

author = "M. Okutan and F. Yakuphanoglu and O. K{\"o}ysal and San, \{S. E.\} and Oweimreen, \{G. A.\}",

note = "Funding Information: This work was partially supported by The Management Unit of Scientific Research Projects of Firat University (F{\"U} BAP) under Project 1230 and Turkish Scientific and Technical Research Council (TUBITAK) via Grant No. TBAG-2400(103T186). Also, one of us, GAO, acknowledges support from King Fahd University of Petroleum and Minerals.",

year = "2008",

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day = "15",

doi = "10.1016/j.jnoncrysol.2008.03.036",

language = "English",

volume = "354",

pages = "3529--3532",

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TY - JOUR

T1 - Molecular orientation and dielectric anisotropy properties of 4-cyano-4′-n-heptylbiphenyl-TiO2 liquid crystal composite

AU - Okutan, M.

AU - Yakuphanoglu, F.

AU - Köysal, O.

AU - San, S. E.

AU - Oweimreen, G. A.

N1 - Funding Information: This work was partially supported by The Management Unit of Scientific Research Projects of Firat University (FÜ BAP) under Project 1230 and Turkish Scientific and Technical Research Council (TUBITAK) via Grant No. TBAG-2400(103T186). Also, one of us, GAO, acknowledges support from King Fahd University of Petroleum and Minerals.

PY - 2008/7/15

Y1 - 2008/7/15

N2 - The molecular orientation and the dielectric anisotropy of the nematic liquid crystal (LC) 4-cyano-4′-n-heptylbiphenyl (7CB) and of TiO2-doped 7CB have been investigated. The dielectric properties of the LCs exhibit a relaxation peak that shifts to lower frequencies with increasing voltages. The relaxation frequencies of 7CB and 7CB/TiO2 liquid crystals were calculated and found to decrease as the bias voltage increases. This is attributed to molecular reorientation. The dielectric anisotropy of the LCs changes from the positive type to negative type and the static electric permittivity and dielectric anisotropy values were found to be lower for the 7CB/TiO2 system.

AB - The molecular orientation and the dielectric anisotropy of the nematic liquid crystal (LC) 4-cyano-4′-n-heptylbiphenyl (7CB) and of TiO2-doped 7CB have been investigated. The dielectric properties of the LCs exhibit a relaxation peak that shifts to lower frequencies with increasing voltages. The relaxation frequencies of 7CB and 7CB/TiO2 liquid crystals were calculated and found to decrease as the bias voltage increases. This is attributed to molecular reorientation. The dielectric anisotropy of the LCs changes from the positive type to negative type and the static electric permittivity and dielectric anisotropy values were found to be lower for the 7CB/TiO2 system.

KW - Dielectric properties, relaxation, electric modulus

KW - Liquid crystals and molecular liquids

UR - https://www.scopus.com/pages/publications/44949130559

U2 - 10.1016/j.jnoncrysol.2008.03.036

DO - 10.1016/j.jnoncrysol.2008.03.036

M3 - Review article

AN - SCOPUS:44949130559

SN - 0022-3093

VL - 354

SP - 3529

EP - 3532

JO - Journal of Non-Crystalline Solids

JF - Journal of Non-Crystalline Solids

IS - 30

ER -