Investigation of Dynamic Orientation Process of Nematic Liquid Crystals Triggered by Conformational Change of Surface Monolayer

Yutaka MAJIMA; Keisuke KATO; Mitsumasa IWAMOTO; Kunihiro ICHIMURA

Investigation of Dynamic Orientation Process of Nematic Liquid Crystals Triggered by Conformational Change of Surface Monolayer

Yutaka MAJIMA, Keisuke KATO, Mitsumasa IWAMOTO, Kunihiro ICHIMURA

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We developed a measuring system that measures both capacitance and transmittance of a liquid crystal (LC) cell simultaneously. We then studied the dynamic orientation process of nematic LC molecules between two-photochromic command surfaces. The command surfaces consist of a polymer monolayer bearing azobenzene side chains and they are deposited on glass substrate coated with indium-tin-oxide by using the Langmuir-Blodgett technique. The capacitance of LC cells increased and decreased alternately due to orientation transition in LC molecules by irradiating ultraviolet (UV) and visible light, respectively. Similarly, with the alternating irradiation of UV and visible lights, the transmittance of the LC cell changed periodically. Mean tilt angles of LC molecules under irradiation of UV and visible lights were evaluated from the results of capacitance and transmittance. It was found that the transient transmittance response was delayed to the transient capacitance under the UV irradiation. This result corresponds to that the LC molecules in homeotropic mode tend to remain the optical alignment.

Publication: IEICE TRANSACTIONS on Electronics Vol.E81-C No.7 pp.1070-1076

Publication Date: 1998/07/25

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Type of Manuscript: Special Section PAPER (Special Issue on Organic Materials for Optics and Electronics)

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Yutaka MAJIMA, Keisuke KATO, Mitsumasa IWAMOTO, Kunihiro ICHIMURA, "Investigation of Dynamic Orientation Process of Nematic Liquid Crystals Triggered by Conformational Change of Surface Monolayer" in IEICE TRANSACTIONS on Electronics, vol. E81-C, no. 7, pp. 1070-1076, July 1998, doi: .
Abstract: We developed a measuring system that measures both capacitance and transmittance of a liquid crystal (LC) cell simultaneously. We then studied the dynamic orientation process of nematic LC molecules between two-photochromic command surfaces. The command surfaces consist of a polymer monolayer bearing azobenzene side chains and they are deposited on glass substrate coated with indium-tin-oxide by using the Langmuir-Blodgett technique. The capacitance of LC cells increased and decreased alternately due to orientation transition in LC molecules by irradiating ultraviolet (UV) and visible light, respectively. Similarly, with the alternating irradiation of UV and visible lights, the transmittance of the LC cell changed periodically. Mean tilt angles of LC molecules under irradiation of UV and visible lights were evaluated from the results of capacitance and transmittance. It was found that the transient transmittance response was delayed to the transient capacitance under the UV irradiation. This result corresponds to that the LC molecules in homeotropic mode tend to remain the optical alignment.
URL: https://globals.ieice.org/en_transactions/electronics/10.1587/e81-c_7_1070/_p

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@ARTICLE{e81-c_7_1070,
author={Yutaka MAJIMA, Keisuke KATO, Mitsumasa IWAMOTO, Kunihiro ICHIMURA, },
journal={IEICE TRANSACTIONS on Electronics},
title={Investigation of Dynamic Orientation Process of Nematic Liquid Crystals Triggered by Conformational Change of Surface Monolayer},
year={1998},
volume={E81-C},
number={7},
pages={1070-1076},
abstract={We developed a measuring system that measures both capacitance and transmittance of a liquid crystal (LC) cell simultaneously. We then studied the dynamic orientation process of nematic LC molecules between two-photochromic command surfaces. The command surfaces consist of a polymer monolayer bearing azobenzene side chains and they are deposited on glass substrate coated with indium-tin-oxide by using the Langmuir-Blodgett technique. The capacitance of LC cells increased and decreased alternately due to orientation transition in LC molecules by irradiating ultraviolet (UV) and visible light, respectively. Similarly, with the alternating irradiation of UV and visible lights, the transmittance of the LC cell changed periodically. Mean tilt angles of LC molecules under irradiation of UV and visible lights were evaluated from the results of capacitance and transmittance. It was found that the transient transmittance response was delayed to the transient capacitance under the UV irradiation. This result corresponds to that the LC molecules in homeotropic mode tend to remain the optical alignment.},
keywords={},
doi={},
ISSN={},
month={July},}

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TY - JOUR
TI - Investigation of Dynamic Orientation Process of Nematic Liquid Crystals Triggered by Conformational Change of Surface Monolayer
T2 - IEICE TRANSACTIONS on Electronics
SP - 1070
EP - 1076
AU - Yutaka MAJIMA
AU - Keisuke KATO
AU - Mitsumasa IWAMOTO
AU - Kunihiro ICHIMURA
PY - 1998
DO -
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E81-C
IS - 7
JA - IEICE TRANSACTIONS on Electronics
Y1 - July 1998
AB - We developed a measuring system that measures both capacitance and transmittance of a liquid crystal (LC) cell simultaneously. We then studied the dynamic orientation process of nematic LC molecules between two-photochromic command surfaces. The command surfaces consist of a polymer monolayer bearing azobenzene side chains and they are deposited on glass substrate coated with indium-tin-oxide by using the Langmuir-Blodgett technique. The capacitance of LC cells increased and decreased alternately due to orientation transition in LC molecules by irradiating ultraviolet (UV) and visible light, respectively. Similarly, with the alternating irradiation of UV and visible lights, the transmittance of the LC cell changed periodically. Mean tilt angles of LC molecules under irradiation of UV and visible lights were evaluated from the results of capacitance and transmittance. It was found that the transient transmittance response was delayed to the transient capacitance under the UV irradiation. This result corresponds to that the LC molecules in homeotropic mode tend to remain the optical alignment.
ER -