Photoisomerization-induced orientational wave generation in two-dimensional liquid crystals at the air-water interface

Yuka Tabe, H. Yokoyama

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Certain class of amphiphilic derivatives of azobenzene form a stable monolayer analog of single-layer smectic-C (SmC) phase at the air-water interface. Due to the broken up-down symmetry, this two-dimensional liquid crystal shows intriguing static orientation structures such as the stripe and higher-order point defects in equilibrium. We found that weak excitation of isomerization reaction of azobenzene core results in a persistent generation of orientational waves and solitons propagating in the plane of the monolayer. This is the first example of purely light-driven nonequilibrium pattern formation. Analysis of the static structures has revealed the essential significance of the coupling between the orientational order and molecular density. Although no definite explanation as yet exists for the dynamic behavior, we believe the density-orientation coupling should play an important role.

Original languageEnglish
Pages (from-to)125-137
Number of pages13
JournalMolecular Crystals and Liquid Crystals Science and Technology, Section A: Molecular Crystals and Liquid Crystals
Volume358
Publication statusPublished - 2001
Externally publishedYes

Fingerprint

Photoisomerization
Liquid Crystals
Azobenzene
wave generation
Liquid crystals
Monolayers
liquid crystals
Water
air
Crystal symmetry
Point defects
Isomerization
Air
Solitons
Crystal orientation
point defects
water
isomerization
solitary waves
analogs

Keywords

  • 2D smectic-C phase
  • Langmuir monolayer
  • Nonequilibrium pattern
  • Orientational wave
  • Photo-isomerization

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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abstract = "Certain class of amphiphilic derivatives of azobenzene form a stable monolayer analog of single-layer smectic-C (SmC) phase at the air-water interface. Due to the broken up-down symmetry, this two-dimensional liquid crystal shows intriguing static orientation structures such as the stripe and higher-order point defects in equilibrium. We found that weak excitation of isomerization reaction of azobenzene core results in a persistent generation of orientational waves and solitons propagating in the plane of the monolayer. This is the first example of purely light-driven nonequilibrium pattern formation. Analysis of the static structures has revealed the essential significance of the coupling between the orientational order and molecular density. Although no definite explanation as yet exists for the dynamic behavior, we believe the density-orientation coupling should play an important role.",
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AB - Certain class of amphiphilic derivatives of azobenzene form a stable monolayer analog of single-layer smectic-C (SmC) phase at the air-water interface. Due to the broken up-down symmetry, this two-dimensional liquid crystal shows intriguing static orientation structures such as the stripe and higher-order point defects in equilibrium. We found that weak excitation of isomerization reaction of azobenzene core results in a persistent generation of orientational waves and solitons propagating in the plane of the monolayer. This is the first example of purely light-driven nonequilibrium pattern formation. Analysis of the static structures has revealed the essential significance of the coupling between the orientational order and molecular density. Although no definite explanation as yet exists for the dynamic behavior, we believe the density-orientation coupling should play an important role.

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