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Dissertations / Theses on the topic 'Orientational order of liquids crystals'

Author: Grafiati

Published: 17 September 2021

Last updated: 30 July 2025

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1

Li, Yuzheng. "The mechanisms of orientational order in nematic liquid crystals." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/30019.

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We have analyzed the NMR spectra of a series of 19 di-halobenzenes having Cs or C₂v symmetry dissolved in a special mixture of nematic liquid crystals, i.e., 55 wt% 1132/EBBA-d₂. This mixture has the unique feature that dideuterium dissolved in it experiences a zero average electric field gradient. Therefore one can assume that for this mixture the contribution to the molecular order due to the interaction between the average electric field gradient and the quadrupole moment of the molecule can be neglected. It has been suggested that the orientational order also depends on the size and shape

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2

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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3

Duzgun, Ayhan. "THEORETICAL STUDIES OF NONUNIFORM ORIENTATIONAL ORDER IN LIQUID CRYSTALS AND ACTIVE PARTICLES." Kent State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=kent1513692638617845.

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4

Hughes, Jason R. "NMR studies of macroscopic and microscopic properties of liquid crystals." Thesis, University of Southampton, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285888.

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5

Vishal, Pandya. "Deuteron Nuclear Magnetic Resonance Studies of Orientational Order of Exotic Liquid Crystals." Kent State University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=kent1185221760.

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6

Geng, Jun. "Self-Assembly, Elasticity, and Orientational Order in Soft Matter." Kent State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=kent1334550704.

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7

Neal, Jeremy R. "Orientationally Ordered Particles: Characterization and Applications." [Kent, Ohio] : Kent State University, 2010. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=kent1271696307.

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Thesis (Ph.D.)--Kent State University, 2010.<br>Title from PDF t.p. (viewed May 26, 2010). Advisor: Peter Palffy-Muhoray. Keywords: orientational order; strain alignment; rubber; stretching; elastomer synthesis; liquid crystal elastomer, gold nanoparticle. Includes bibliographical references (p. 183-186).

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8

Kossack, Wilhelm. "Infrared Transition Moment Orientational Analysis on polymeric systems." Doctoral thesis, Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-189315.

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In dieser Arbeit wird ein Verfahren entwickelt (Infrared Transition Moment Orientational Analysis, IR-TMOA) um die dreidimensionale Ordnung auf molekularer Ebene in infrarot-durchlässigen Systemen zu quantifizieren. Es beruht auf der Messung zahlreicher Infrarotspektren, die unter systematisch variierender Polarisation des einfallenden Lichts und Ausrichtung der Probe relativ zur optischen Achse aufgenommen werden. So wird ein repräsentativer Ausschnitt des dreidimensionalen Absorptionsellipsoids gemessen. Die Tensordarstellung dieses Ellipsoids ist äquivalent zum quadratischen Mittel der Vert

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9

Sánchez, Castillo Alberto [Verfasser]. "Polarized micro-Raman spectroscopy: A modern technique to study the molecular orientational order of nematic and smectic liquid crystals / Alberto Sánchez Castillo." München : Verlag Dr. Hut, 2013. http://d-nb.info/1042306931/34.

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10

Di, Pietro Maria Enrica. "RMN dans différents solvants partiellement orientés : pour la détermination de la structure, l’ordre et la conformation de molécules organiques." Thesis, Paris 11, 2013. http://www.theses.fr/2013PA112309/document.

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La spectroscopie RMN alliée à l’utilisation de solvants cristal-liquide fortement et faiblement orientants est une stratégie efficace pour élucider les structures et distributions conformationnelles de petites molécules organiques rigides et flexibles en solution, et déterminer les ordres orientationnel et positionnel des solutés comme des solvants orientés. Dans une première partie, afin d’explorer les différentes contributions aux couplages dipolaires d’un soluté donné, la très faible amplitude de l’ordre orientationnel d’une molécule quasi-sphérique, le tetramethylallène, dissoute dans un n

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11

Bechtold, Ivan Helmuth. ""Efeitos de superfície e de confinamento na ordem orientacional de cristais líquidos"." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-20082004-164756/.

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Neste trabalho investigamos os efeitos de superfícies de contorno e de confinamento na ordem orientacional de cristais líquidos, onde utilizamos cristais líquidos termotrópicos e liotrópicos. A importância deste estudo deve-se à aspectos tanto de interesse tecnológico (formas de alinhamento) como de pesquisa básica. Com relação aos cristais líquidos termotrópicos, determinamos que cargas eletrostáticas superficiais induzidas por esfregamento influenciam as propriedades orientacionais do cristal líquido, essas cargas foram medidas com a técnica de microscopia de força eletrostática (EFM). Estud

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12

Majumdar, Madhabi. "Elastic Constants, Viscosities and Fluctuation Modes of Certain Bent-Core Nematic Liquid Crystals Studied by Dynamic Light Scattering and Magnetic Field Induced Orientational Distortion." Kent State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=kent1321991835.

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13

Park, Min Sang. "Application of polarized Raman spectroscopy for analysis of phase transitions and anisotropic behavior of soft condensed matter." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/47539.

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The importance of soft matter research, as a major class of materials including liquid crystals, polymers, colloids, emulsions, and forms, is attributed to the behavior resemblances in each branch of soft matter responding to the external perturbations. Hence, one of the most required inquiries in soft matter physics is understanding how the structures with characteristic length scales evolve in response to external perturbations, and concomitant phase transitions. We have focused on adopting polarized Raman spectroscopy to probe phase transitions in soft materials consisting of anisometric co

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14

Nguyen, Thanh-Son. "STATISTICAL PHYSICS OF ORIENTATIONAL ORDER AND CURVATURE." Kent State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=kent1421895006.

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15

Marchetti, Alessandro. "Sviluppi metodologici per la cristallizzazione e l’analisi strutturale di proteine tramite Risonanza Magnetica Nucleare allo stato solido." Doctoral thesis, Scuola Normale Superiore, 2012. http://hdl.handle.net/11384/85789.

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High-resolution solid-state NMR (ssNMR) has recently emerged as a powerful characterization technique for systems that cannot be investigated by solution NMR or X-ray crystallographic methods, and represents a subtle complementary technique for any atomic-scaled study. This is particularly true in structural biology. There exist nowadays well established protocols for sample preparation, resonance assignment and collection of structural restraints, that have paved the way to the first three-dimensional structure determinations at atomic resolution of biomolecules in the solid state, from micr

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16

Liang, Wenlang. "Imaging long-range orientational order in monolayers of amphiphilic molecules with scanning probe force microscope and liquid crystal optical amplification." Master's thesis, University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/6231.

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Monolayers of amphiphilic molecules at interface provide a unique system for understanding the thermodynamic and rheological properties of quasi two-dimensional systems. They are also an excellent model accessible for studying cell membranes. The feature of long-range organization of molecular tilt azimuth in monolayers at the air/water interface is one of the most interesting findings over the past two decades, which leads to the formation rich and defined textures. By observing the changes in these textures, the transitions between tilted monolayer phases can be detected. We study the boojum

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17

Piovesan, Annie. "Contribution a l'etude de la structure moleculaire de mesogenes thermotropes hautement ordonnes : transitions monocouche-bicouche dans des composes polaires." Clermont-Ferrand 2, 1986. http://www.theses.fr/1986CLF21042.

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Etude de cristaux liquides thermotropes presentant des phases smectiques de type a et b. Etude de l'influence de divers parametres moleculaires sur la stabilite thermique de telles phases. Proposition d'un modele d'organisation des molecules a l'interieur d'une lamelle smectique

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18

Caniparoli, Jean-Philippe. "Etude par resonance magnetique nucleaire des conformations et des interactions moleculaires dans les mesophases lyotropes : application a des problemes de solubilisation." Paris 6, 1988. http://www.theses.fr/1988PA066117.

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Etude par rmn, de l'ordre et de la dynamique moleculaire des phases lyotropes de systemes binaires agent de surface a double chaine/eau: parametres d'ordre eleves, probabilites conformationelles, temps de correlation des mouvements moleculaires tres anisotropes en fonction de la tete polaire (phosphate ou ammonium); faible influence de la longueur de la chaine. Etude de l'ordre et de la dynamique de petites molecules en solution dans le systeme dibutylphosphate de sodium/eau en phase lamellaire: influence importante du caractere hydrophile ou hydrophobe du solute. Localisation des solutes non

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19

Wu, Yih-Chun, and 吳易駿. "Orientational Order Induced by Solid Surface for Mixed Liquid Crystals." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/17554857801179266508.

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碩士<br>國立交通大學<br>電子物理學系<br>85<br>Using the evanescent-wave-ellipsometric technique,we have studied the orientational wetting behavior of isotropic LC to solid interface as T>Tc.The sample is made of 5CB and 7CB on a glass substrate coated with DMOAP.The mixtures are varied by changing mixing ratio and the surface potential can be varied accordingly. The properties of orientational wetting for various surface potentials are studied. The results show

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20

Aguirre, Luis Ever. "Transiciones de orden inducidas en sistemas mesomórficos." Doctoral thesis, 2011. http://hdl.handle.net/11086/162.

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Tesis (Doctor en Física)--Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física, 2011.<br>Experimentos realizados en celdas electro-ópticas sometidas a la aplicación de tensiones alternas (AC) y continuas (DC), conducen a resultados escasamente explorados en la literatura y jamás explicados de manera consistente. Particularmente, se observan patrones celulares que, bajo ciertas condiciones, evolucionan a patrones hexagonales. Teniendo en cuenta que la aplicación de tensiones alternas (AC) y continuas (DC), dan lugar a efectos que pueden ser relevantes en la formación

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21

LIN, SHENG-XIAN, and 林昇賢. "Surface potential and its effect on surface induced orientational order in liquid crystal." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/40742095203915371285.

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22

WANG, JIE-XIAO, and 王介孝. "Wall-induced orientational order of a liquid crystal in the isotropic phase:an evanescent-wave-ellipsometry study." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/95133927612258708761.

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23

Kijatkin, Christian. "Ultrafast Photon Management: The Power of Harmonic Nanocrystals in Nonlinear Spectroscopy and Beyond." Doctoral thesis, 2019. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-201904011323.

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The present work broaches the physics of light-matter interaction, chiefly using nonlinear optical spectroscopy in a newly developed framework termed as Photon Management Concept. This way, existing fragments dealing with specific properties of harmonic and upconversion nanoparticles (HNPs/UCNPs) are consolidated into a full and coherent picture with the primary goal of understanding the underlying physical processes and their impact on the application side, especially in terms of imaging techniques, via suitable experimental and numerical studies. Contemporary optical setups involving cont

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