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Disorder/reorientation dynamics of 4-methoxybenzylidene-4-n-butylaniline observed by heterodyne transient grating method

Paper ID Volume ID Publish Year Pages File Format Full-Text
26516 43958 2013 5 PDF Available
Title
Disorder/reorientation dynamics of 4-methoxybenzylidene-4-n-butylaniline observed by heterodyne transient grating method
Abstract

•Photo-induced molecular motion of liquid crystal in an oriented cell was observed.•Ordered molecules were disordered and recovered depending on the cell direction.•Molecular response depended on the irradiated light intensity.•Photo-induced domain formation was proposed for high irradiation intensity.

Molecular dynamics of 4-methoxybenzylidene-4-n-butylaniline (MBBA) in a liquid crystal cell after the perturbation of a UV pulse was observed using the polarization dependent heterodyne transient grating (HD-TG) method. The response of a refractive index change showed different signs depending on the probe polarization, and each response was composed of 4 exponential components. These components were assigned to disordering, 2 types of ordering, and molecular diffusion, judged from the sign of the refractive index change and the dependence on the grating spacing and the pump intensity. The time constants for the disordering and the ordering processes drastically increased for the pump intensity above 0.10 mJ/pulse. To explain the threshold, we proposed that disordering/ordering of domains were observed for the higher pump intensities, while an individual molecule is subject to disordering/ordering for the lower pump intensity.

Graphical abstractPump intensity and probe polarization dependent ordering/reorientation processes of MBBA were observed by a heterodyne transient grating method. We proposed light-induced domains by increasing the pump intensity.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Liquid crystal; Transient grating; Dynamics
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Disorder/reorientation dynamics of 4-methoxybenzylidene-4-n-butylaniline observed by heterodyne transient grating method
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 266, 15 August 2013, Pages 1–5
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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