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Application-Driven Studies of Photom...

Bernhardt, Elizabeth Adeline.

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Application-Driven Studies of Photomechanical Materials.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Application-Driven Studies of Photomechanical Materials./
作者:	Bernhardt, Elizabeth Adeline.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
面頁冊數:	221 p.
附註:	Source: Dissertation Abstracts International, Volume: 79-11(E), Section: B.
Contained By:	Dissertation Abstracts International79-11B(E).
標題:	Physics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10750959
ISBN:	9780438103924

Application-Driven Studies of Photomechanical Materials.
Bernhardt, Elizabeth Adeline.

Application-Driven Studies of Photomechanical Materials. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 221 p.

Source: Dissertation Abstracts International, Volume: 79-11(E), Section: B.

Thesis (Ph.D.)--Washington State University, 2018.

Deep brain stimulation therapy is a well-established medical procedure with well-documented benefits, but this procedure would be enhanced by a flexible therapy device that could bend when photoactivated. To this end, two types of materials, which respond to light by inducing a stress and strain, show promise and are therefore selected to be characterized: photomechanical dye-doped glassy polymer fibers and liquid crystal elastomers. A custom designed and built apparatus, the photorheometer, measures the force created by these materials during photostimulation. Using the developed theory, it is found that the liquid crystal elastomers produce a large strain but small stress while dye-doped glassy polymer fibers produce a large stress but small strain.

ISBN: 9780438103924Subjects--Topical Terms:

516296
Physics.

Application-Driven Studies of Photomechanical Materials.
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500 $a Source: Dissertation Abstracts International, Volume: 79-11(E), Section: B.
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520 $a Deep brain stimulation therapy is a well-established medical procedure with well-documented benefits, but this procedure would be enhanced by a flexible therapy device that could bend when photoactivated. To this end, two types of materials, which respond to light by inducing a stress and strain, show promise and are therefore selected to be characterized: photomechanical dye-doped glassy polymer fibers and liquid crystal elastomers. A custom designed and built apparatus, the photorheometer, measures the force created by these materials during photostimulation. Using the developed theory, it is found that the liquid crystal elastomers produce a large strain but small stress while dye-doped glassy polymer fibers produce a large stress but small strain.
520 $a Photoisomerization in dyes, a mechanism where a molecule changes shape in response to photostimulation, is investigated in dye-doped glassy polymer fibers. Results show glassy polymer fibers doped with isomerizable dyes have a notable polarization dependence, but this dependence cannot be fully explained by isomerization alone, as non-isomerizable dyes also have a polarization dependence.
520 $a Liquid crystal elastomers from two synthesis methods are characterized. The first method creates side-chain end-on siloxane-based liquid crystal elastomers, and the second method is a two-stage procedure creating main-chain acrylate-based liquid crystal elastomers. Using the photorheometer, materials made with the different synthesis methods are charactered with various liquid crystalline order. The materials made with the two-stage procedure are also characterized as a function of pre-strain, dye concentration, and crosslink density. Results show monodomain (highly ordered liquid crystal elastomer), low dye concentration, and crosslinked liquid crystal elastomers have a larger photomechanical response than polydomain, high dye concentration (0.25%mol--1% mol), non-crosslinked liquid crystal elastomers.
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