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Dissertations / Theses on the topic 'Liquid crystal'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Legge, Coulton Heath. "Structural modifications in liquid crystals and liquid crystal polymers." Thesis, University of Reading, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306164.

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2

Wu, Haixia. "Anchoring Behavior of Chiral Liquid Crystal at Polymer Surface: In Polymer Dispersed Chiral Liquid Crystal Films." Thesis, Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-04082004-154054/unrestricted/wu%5Fhaixia%5F200405%5Fmast.pdf.

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Thesis (M.S.)--Textile and Fiber Engineering, Georgia Institute of Technology, 2004.<br>Griffin, Anselm, Committee Member; Srinivasarao, Mohan, Committee Chair; Park, Jung O., Committee Member. Includes bibliographical references (leaves 101-105).

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3

Cosquer, Guirec Yann. "Liquid crystals with novel terminal chains as ferroelectric liquid crystal hosts." Thesis, University of Hull, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322457.

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4

Cronin, Thomas. "Liquid crystal biosensors." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/liquid-crystal-biosensors(428e3ba0-bf7e-4dda-9eae-c44c9713c7bb).html.

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The aim of the thesis was to identify and hence investigate the physical properties of liquid crystals that influence their potential as components of biosensor devices. Silicon surfaces presenting photolithographically fabricated arrays of 50nm thick gold spots were used as the model for a biosensor that detects the surface binding of a biological analyte. The spots ranged in diameter from 2μm to 16μm and their spatial separation varied between 5μm to 40μm. A Self Assembled Monolayer (SAM) of the thiol 3-mercaoptopropionic acid was used to control the surface chemistry of the gold. The respon

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5

Ford, A. D. "Liquid crystal lasers." Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.599106.

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This thesis examines the emission properties of liquid crystal (LC) lasers. The aim is to investigate correlations between the emission properties of the laser, in particular the threshold energy and the slope efficiency, and the macroscopic physical properties of the liquid crystal host. Using the threshold gain term obtained for a distributed feedback laser in the context of the coupled mode theory, an expression for the threshold energy (<i>E</i><sub>th</sub>) is obtained, in the form <i>E<sub>th </sub></i> ∝ <i>d</i> + 1/Δn²d² where <i>d</i> is the cell thickness and Δ<i>n</i> is the biref

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6

Kirby, Neil Andrew. "Liquid crystal polymers." Thesis, University of Sussex, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240445.

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7

Higgenbottom, Morris Scott. "Liquid crystal modulation of retroreflection : a low-power communication/location technology." Thesis, Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/16695.

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8

Liu, Zhijian. "Photo-aligned LC cell with weak anchoring energy and specific profiles : physics & applications /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?ECED%202006%20LIU.

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9

Reznikov, Dmytro. "Effect of surface alignment layer on electro-optical properties of ferroelectric liquid crystal displays." [Kent, Ohio] : Kent State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=kent1227562895.

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Thesis (Ph.D.)--Kent State University, 2008.<br>Title from PDF t.p. (viewed Jan 5, 2010). Advisor: Philip J. Bos. Keywords: liquid crystal, smectic, display, ferroelectric. Includes bibliographical references (p. 190-194).

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10

Dong, Shaosheng. "Liquid Crystal Polymers And Dendritic Liquid Crystals: Synthesis, Morphology, Rheology And Binary Mixtures." online version, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=case1094584392.

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11

Fan, Yun-Hsing. "TUNABLE LIQUID CRYSTAL PHOTONIC DEVICES." Doctoral diss., University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3926.

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Liquid crystal (LC)-based adaptive optics are important for information processing, optical interconnections, photonics, integrated optics, and optical communications due to their tunable optical properties. In this dissertation, we describe novel liquid crystal photonic devices and their fabrication methods. The devices presented include inhomogeneous polymer-dispersed liquid crystal (PDLC), polymer network liquid crystals (PNLC) and phase-separated composite film (PSCOF). Liquid crystal/polymer composites could exist in different forms depending on the fabrication conditions. In Chap. 3, we

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12

Kim, Sang Hwa. "Fast Switching Polymer Stabilized Liquid Crystal Devices: Morphological and Electro-Optical Properties." [Kent, Ohio] : Kent State University, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=kent1101220722.

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13

Tadeusiak, Andrezej Jan. "Fluorinated liquid crystal systems." Thesis, Durham University, 2008. http://etheses.dur.ac.uk/2259/.

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Chapter 1. An introduction to the principles of two different types of LC cell and the design of new fluorinated materials for modem LCD applications is presented here. Discussion includes reasons why fluorinated molecules have become the compounds of choice for display devices, and a history of organo-fluorine chemistry from early discovery of the element, through nucleophilic substitution and debromolithiation reactions of bromoperfluorobenzenes, to very recent developments in synthesis.Chapter 2. This chapter presents a brief overview of some of our early ideas as to how new fluorinated LCs

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14

Draper, Michael. "Golden liquid crystal nanoparticles." Thesis, University of York, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.542804.

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15

Verrall, Mark Andrew. "Ferroelectric liquid crystal polymers." Thesis, University of Southampton, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313194.

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16

Springle, Ian David. "Photoluminescent liquid crystal displays." Thesis, University of Cambridge, 1997. https://www.repository.cam.ac.uk/handle/1810/272071.

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17

Xu, Peizhi. "Electrooptical modes of liquid crystal for shutter and display applications /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202005%20XU.

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18

Burnham, Kikue Sugiyama. "Phototriggers for a liquid crystal-based optical switch." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/27900.

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19

Zhang, Zichen. "Phase-only nematic liquid crystal on silicon devices." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610052.

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20

Yeung, Fion Sze Yan. "Variable liquid crystal pretilt angles by nanostructured surfaces and their applications /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?ECED%202007%20YEUNG.

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21

Du, Tao. "Single cell gap transflective liquid crystal displays and the use of photoalignment technology /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?ECED%202009%20DU.

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22

Li, Xihua. "Bi and multi stable ferroelectric liquid crystal displays /." View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?ECED%202008%20LI.

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23

Zhou, Ying. "CHOLESTERIC LIQUID CRYSTAL PHOTONIC CRYSTAL LASERS AND PHOTONIC DEVICES." Doctoral diss., University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2706.

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This dissertation discusses cholesteric liquid crystals (CLCs) and polymers based photonic devices including one-dimensional (1D) photonic crystal lasers and broadband circular polarizers. CLCs showing unique self-organized chiral structures have been widely used in bistable displays, flexible displays, and reflectors. However, the photonic band gap they exhibit opens a new way for generating laser light at the photonic band edge (PBE) or inside the band gap. When doped with an emissive laser dye, cholesteric liquid crystals provide distributed feedback so that mirrorless lasing is hence possi

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24

Bin, Peng. "Liquid crystal polymer brushes and their application as alignment layers in liquid crystal cells." [S.l. : s.n.], 2000. http://ArchiMeD.uni-mainz.de/pub/2000/0094/diss.pdf.

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25

DEY, SONAL. "ELASTICITY OF MAIN CHAIN LIQUID CRYSTAL ELASTOMERS AND ITS RELATIONSHIP TO LIQUID CRYSTAL MICROSTRUCTURE." Kent State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=kent1385403238.

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26

Neupane, Krishna Prasad. "Light Scattering Studies of Orientational Order in Liquid Crystalline Tetrapodes and Lyotropic Chromonic Liquid Crystals." Kent State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=kent1239811255.

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27

Kurz, GuÌˆnter. "Hydrodynamics of defects in nematic liquid crystal films." Thesis, King's College London (University of London), 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313591.

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28

Shi, Lei. "Tunable liquid crystal polarization gratings." [Kent, Ohio] : Kent State University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=kent1258988951.

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Thesis (Ph.D.)--Kent State University, 2009.<br>Title from PDF t.p. (viewed Apr. 22, 2010). Advisor: Philip Bos. Keywords: Liquid crystal; beam steering; polarization gratings; diffraction efficiency; decentered microlens array. Includes bibliographical references (p. 216-219).

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29

Shafran, Matthew S. "Responsive liquid crystal polymer rods." Morgantown, W. Va. : [West Virginia University Libraries], 2008. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5598.

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Thesis (M.S.)--West Virginia University, 2008.<br>Title from document title page. Document formatted into pages; contains viii, 71 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 63-67).

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30

Walker, David B. "Ferroelectric liquid crystal waveguide modulators." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/13277.

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31

Lee, Michael Siew Khay. "Side chain liquid crystal polysiloxanes." Thesis, University of Hull, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384846.

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32

Gillespie, C. "Dye doped liquid crystal lasers." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.599422.

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This thesis examines the emission properties of dye-doped liquid crystal lasers, which are of interest because they have the potential to provide compact, low threshold, tunable laser sources for applications ranging from medicine to displays. The primary aim is to provide the first detailed study of the interactions between liquid crystals (LCs) and laser dyes and to examine their effect upon the emission properties of dye-doped liquid crystal lasers. Five different dyes are examined and, in all cases, the LC host (a nematic mixture, E49) is shown to have a significant effect upon the propert

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33

Kim, Wook Sung. "Scattering in liquid crystal displays." Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.526470.

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34

Wu, Yung-Hsun. "FAST RESPONSE LIQUID CRYSTAL DEVICES." Doctoral diss., University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3111.

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Liquid crystal (LC) has been widely used for displays, spatial light modulators, variable optical attenuators (VOAs) and other tunable photonic devices. The response time of these devices is mainly determined by the employed liquid crystal material. How to obtain fast response for the LC devices is a fundamentally important and technically challenging task. In this dissertation, we investigate several methods to improve liquid crystal response time, for examples, using dual-frequency liquid crystals, polymer stabilized liquid crystals, and sheared polymer network liquid crystals. We discover a

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35

Lin, Yi-Hsin. "POLARIZATION-INDEPENDENT LIQUID CRYSTAL DEVICES." Doctoral diss., University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4199.

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Liquid crystal (LC) devices can be operated as amplitude modulators and phase modulators. LC amplitude modulation is commonly used in liquid crystal display (LCD) while phase-only modulation is useful for laser beam steering, tunable grating, prism, lens, and other photonic devices. Most LC devices are polarization dependent and require at least one polarizer. As a result, the optical efficiency is low. To enhance display brightness, a power hungry backlight has to be used leading to a high power consumption and short battery life. In a LC phase modulator, the polarization dependent property c

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36

Jiao, Meizi. "Fast-response liquid crystal displays." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4580.

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After about five decades of extensive material research and device development, followed by massive investment in manufacturing technology, thin-film-transistor liquid-crystal-display (TFT-LCD) has finally become the dominant flat panel display technology. Nowadays, LCD performances, such as viewing angle, contrast ratio, and resolution, have reached acceptable levels. The remaining major technical challenges are response time, light efficiency, and sunlight readability. Fast response time is desired to reduce motion blur and to enable field sequential color displays using red (R), green (G),

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37

Blatch, Andrew. "Non-symmetric liquid crystal dimers." Thesis, University of Southampton, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246224.

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38

Pawsey, Anne Claire. "Colloids at liquid crystal interfaces." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/8969.

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This thesis presents a study of colloidal particles dispersed in thermotropic liquid crystals. It has a specific focus on colloids in the presence of an interface between the liquid crystal and an isotropic fluid. Three systems are studied: colloids trapped at a planar interface between a cholesteric liquid crystal (CLC) and an isotropic oil, nematic emulsions with interfacial colloids and the influence of colloids on the phase transition kinetics of the cholesteric blue phase. Experiments are carried out using polarising optical and confocal microscopy. By combining these techniques, the dire

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39

Everitt, David R. R. "Cyclic polymer liquid crystal structures." Thesis, Sheffield Hallam University, 1990. http://shura.shu.ac.uk/19634/.

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Recent advances in liquid crystal research have included the synthesis of polymeric materials which contain liquid crystalline moieties. The work presented here concerns the study of the structure-property relationships of a particular group of liquid crystalline polymers in which the polymer backbone is cyclic, with the mesogenic moieties attached as side-chains. We have observed mesogenic phases above room temperature for materials comprising cyclic poly(dimethylsiloxane) backbones with mesogenic moieties attached by alkyl spacer units. Dielectric relaxations have been observed in the mesoph

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40

Venkataraman, Nithya Leela. "Photosensitive Cholesteric Liquid Crystal Materials." Kent State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=kent1248110797.

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41

Lazo-Martinez, Israel Esteban. "Liquid Crystal Enabled Electrokinetic Phenomena." Kent State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=kent1397725003.

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42

Gimenez, Pinto Vianney Karina. "MODELING LIQUID CRYSTAL POLYMERIC DEVICES." Kent State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=kent1398039813.

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43

Li, Yuet Wing. "Liquid crystal pretilt angle measurement /." View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202003%20LIY.

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44

Mang, Xiaobin. "Self-assembled liquid crystal nanostructures." Thesis, University of Sheffield, 2012. http://etheses.whiterose.ac.uk/2041/.

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Self-assembly of liquid crystalline molecules has been a highly interesting research area over the past few decades. The modification of traditional rod-like liquid crystalline molecules by adding additional functional groups is an effective way to obtain novel liquid crystal phases due to the segregation of incompatible molecular components, and this has been proved by various mesophases obtained from molecules which possess special shapes and structures. More recently, liquid crystalline molecules have been introduced to functionalize metallic nanoparticles to arrange these spherical particl

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45

Mercer, Carolyn Regan. "Liquid crystal point diffraction interferometer." Diss., The University of Arizona, 1995. http://hdl.handle.net/10150/187127.

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A new instrument, the liquid crystal point diffraction interferometer (LCPDI), has been developed for the measurement of phase objects. This instrument maintains the compact, robust design of Linnik's point diffiaction interferometer (PDI) and adds to it phase stepping capability for quantitative interferogram analysis. The result is a compact, simple to align, environmentally insensitive interferometer capable of accurately measuring optical wavefronts with very high data density and with automated data reduction. This dissertation describes the theory of both the PDI and liquid crystal phase

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46

Haddock, Joshua Naaman. "Liquid Crystal Based Electro-Optic Diffractive Spectacle Lenses and Low Operating Voltage Nematic Liquid Crystals." Diss., Tucson, Arizona : University of Arizona, 2005. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu%5Fetd%5F1304%5F1%5Fm.pdf&type=application/pdf.

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47

Gopalanarayanan, Bhaskar. "Analysis of Thermoplastic Polyimide + Polymer Liquid Crystal Blends." Thesis, University of North Texas, 1998. https://digital.library.unt.edu/ark:/67531/metadc279285/.

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Thermoplastic polyimides (TPIs) exhibit high glass transition temperatures (Tgs), which make them useful in high performance applications. Amorphous and semicrystalline TPIs show sub-Tg relaxations, which can aid in improving strength characteristics through energy absorption. The a relaxation of both types of TPIs indicates a cooperative nature. The semicrystalline TPI shows thermo-irreversible cold crystallization phenomenon. The polymer liquid crystal (PLC) used in the blends is thermotropic and with longitudinal molecular structure. The small heat capacity change (ACP) associated with the

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48

Debnath, Asim. "Formulation and characterization of room temperature ferroelectric and antiferroelectric liquid crystal mixtures." Thesis, University of North Bengal, 2018. http://hdl.handle.net/123456789/2783.

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49

De, Vos Thierri. "Etude théorique et par simulations d'une phase nématique confinée et torsadée de molécules discotiques." Doctoral thesis, Universite Libre de Bruxelles, 2008. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210483.

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Il est actuellement bien connu que les molécules non sphériques peuvent former des mésophases (ou cristaux liquides), c'est-à-dire des phases dont les propriétés sont intermédiaires entre celles des liquides et celles des cristaux. La mésophase la plus connue est la phase nématique. Il s'agit d'une phase caractérisée par une distribution aléatoire des centres de masse des molécules, mais dans laquelle l'orientation des molécules présente une direction préférentielle, désignée par un vecteur unité appelé le directeur du nématique. Une telle phase possède donc la fluidité d'un liquide tout en pr

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50

Wang, Xinghua. "Liquid Crystal Diffractive Optical Elements: Applications and Limitations." [Kent, Ohio] : Kent State University, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=kent1122499777.

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Thesis (Ph.D.)--Kent State University, 2005.<br>Title from PDF t.p. (viewed Sept. 14, 2006). Advisor: Philip J. Bos. Keywords: liquid crystal; diffractive optical element; optical phased array; spatial light modulator; high resolution wavefront control; aberration correction. Includes bibliographical references (p. 206-213).

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