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Seminars & Lectures

* TITLE

Confinement-induced transition of topological defects in smectic liquid crystals: From a point to a line and pearls

* SPEAKERS

Name	Affiliation	E-mail
Mahn Won Kim	KAIST

* HOST(Applicant)

Name	Affiliation	E-mail
Yongseok Jho	APCTP	ysjho(at)apctp.org

* DATE / TIME

2012-05-17, 16:00

* PLACE

512 Conference room, APCTP Headquarters, Pohang

* ABSTRACT

We report the first study on the confinement-induced transition of
the topological defects of liquid crystals (LCs) using smectic-A LCs
confined in prolate spheroids with homeotropic anchoring. Upon
increasing the aspect ratio of a LC droplet, dispersed in a stretched
elastomer film, the topological defect undergoes a transition from a
point to a line of which the length is a function of the aspect
ratio.
Additionally, when the size of a droplet is larger than a certain
value, the defect has a pearl-necklace-like texture. We propose a
simple model to understand the formation of these defects in terms of
the misorientation and undulation instability of the smectic layers.
In addition, I\\\'ll present the current activities in my soft matter
physics research lab. at KAIST.

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