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Surface force studies on a smectic A...

University of Colorado at Boulder.

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Surface force studies on a smectic A liquid crystal.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Surface force studies on a smectic A liquid crystal./
Author:	Herke, Richard Alan.
Description:	165 p.
Notes:	Director: Noel A. Clark.
Contained By:	Dissertation Abstracts International54-10B.
Subject:	Physics, General. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9406772

Surface force studies on a smectic A liquid crystal.
Herke, Richard Alan.

Surface force studies on a smectic A liquid crystal. - 165 p.

Director: Noel A. Clark.

Thesis (Ph.D.)--University of Colorado at Boulder, 1993.

A force applied normal to the layers of a smectic A liquid crystal aligned between the two surfaces of a spherical wedge can induce the exclusion in compression or inclusion in dilation of a single smectic layer. This is evidenced by jumps in surface separation with the size of the smectic layers. This thesis reports the study of the dynamics of these events. A novel surface forces apparatus, in which distances are sensed capacitively, has been constructed and used for the examination of these layer events. These experiments reveal an interesting avalanche like yield characteristic. Though the majority of the surface separation change occurs in a jump of short duration, typically about a second, there is a slow precursor acceleration which may last a hundred seconds or more and a slowly decaying tail which may last several hundred seconds. Multiple layer events are also observed in which the individual layer jumps are separated by short periods of reduced separation change, and the duration of each succeeding jump becomes significantly longer. Computer modeling based on the movement of edge dislocations in the sample fails to simulate these events, however, a model based on the helical instability of screw dislocations does indeed reproduce the dynamic features. The picture which emerges is of a cascade of helical instabilities of screw dislocation lines moving out from the center of the spherical wedge.Subjects--Topical Terms:

1018488
Physics, General.

Surface force studies on a smectic A liquid crystal.
LDR:02240nam 2200253 a 45 001 969306
005 20110920
008 110921s1993 eng d
035 $a (UMI)AAI9406772
035 $a AAI9406772
040 $a UMI $c UMI
100 1 $a Herke, Richard Alan. $3 1293360
245 1 0 $a Surface force studies on a smectic A liquid crystal.
300 $a 165 p.
500 $a Director: Noel A. Clark.
500 $a Source: Dissertation Abstracts International, Volume: 54-10, Section: B, page: 5198.
502 $a Thesis (Ph.D.)--University of Colorado at Boulder, 1993.
520 $a A force applied normal to the layers of a smectic A liquid crystal aligned between the two surfaces of a spherical wedge can induce the exclusion in compression or inclusion in dilation of a single smectic layer. This is evidenced by jumps in surface separation with the size of the smectic layers. This thesis reports the study of the dynamics of these events. A novel surface forces apparatus, in which distances are sensed capacitively, has been constructed and used for the examination of these layer events. These experiments reveal an interesting avalanche like yield characteristic. Though the majority of the surface separation change occurs in a jump of short duration, typically about a second, there is a slow precursor acceleration which may last a hundred seconds or more and a slowly decaying tail which may last several hundred seconds. Multiple layer events are also observed in which the individual layer jumps are separated by short periods of reduced separation change, and the duration of each succeeding jump becomes significantly longer. Computer modeling based on the movement of edge dislocations in the sample fails to simulate these events, however, a model based on the helical instability of screw dislocations does indeed reproduce the dynamic features. The picture which emerges is of a cascade of helical instabilities of screw dislocation lines moving out from the center of the spherical wedge.
590 $a School code: 0051.
650 4 $a Physics, General. $3 1018488
690 $a 0605
710 2 0 $a University of Colorado at Boulder. $3 1019435
773 0 $t Dissertation Abstracts International $g 54-10B.
790 $a 0051
790 1 0 $a Clark, Noel A., $e advisor
791 $a Ph.D.
792 $a 1993
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9406772