Дисертації з теми "Phonon Liquid Electron Crystal"
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Galda, Alexey. "Electronic properties of Luttinger Liquid with electron-phonon interaction." Thesis, University of Birmingham, 2013. http://etheses.bham.ac.uk//id/eprint/4293/.
Повний текст джерелаCarter, Paul James Anthony. "Acoustic phonon scattering by a 2 dimensional electron gas." Thesis, University of Nottingham, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329844.
Повний текст джерелаBakrim, Hassan. "Étude des transitions de Peierls dans les systèmes unidimensionnels et quasi-unidimensionnels." Thèse, Université de Sherbrooke, 2010. http://savoirs.usherbrooke.ca/handle/11143/5140.
Повний текст джерелаBryan, Charles Edward. "An electron beam addressed liquid crystal light valve projector." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235841.
Повний текст джерелаDaga, Kamal Dhulchand. "Extrusion of a thermotropic liquid crystal polymer." Ohio : Ohio University, 1987. http://www.ohiolink.edu/etd/view.cgi?ohiou1183043184.
Повний текст джерелаSpencer, Paul E. "Continuous-time quantum Monte Carlo studies of lattice polarons." Thesis, Loughborough University, 2000. https://dspace.lboro.ac.uk/2134/33799.
Повний текст джерелаSung, Baeckkyoung. "Condensation of DNA by spermine in the bulk and in the bacteriophage capsid : a cryo-electron microscopy study." Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00725394.
Повний текст джерелаMitcov, Dmitri. "Rational functionalization of molecular magnetic materials : towards liquid crystalline phases, improved solubility and modulation of physical properties." Thesis, Bordeaux, 2014. http://www.theses.fr/2014BORD0029/document.
Повний текст джерелаThe work presented in this thesis was focused on the design and investigation of novel hybrid materials via ligand functionalization of the single-molecule magnets (SMMs) and electron transfer complexes. Chapter I contains general information about these two classes of the magnetic systems. In order to illustrate the motivation behind our work, a brief review on previously reported soft hybrid magnetic systems, is presented. Chapter II is dedicated to the functionalization of [Mn12]-based SMMs towards hybrid liquid crystalline systems via two different approaches: (a) the functionalization of peripheral ligands with strongly lipophilic groups (long alkyl chains), or (b) the grafting of mesogenic promoters through flexible aliphatic spacers. Chapters III – V are focused on cyanido-bridged molecular {Fe2Co2} squares that exhibit thermally or photo-induced electron transfer. Thus, in Chapter III, the possibility to modulate the electron transfer properties in {Fe2Co2} molecular squares via the use of different counter-anion is discussed. The functionalization with long aliphatic chains and its influence over the properties of {Fe2Co2} molecular squares in solid state and solutions are discussed in Chapter IV. Finally, the effect of the ligand functionalization with strongly electron density donating groups (methoxy) over the electron transfer properties of {Fe2Co2} molecular squares is investigated in Chapter V
Alameer, Maryam. "Polarization Dependent Ablation of Diamond with Gaussian and Orbital Angular Momentum Laser Beams." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39850.
Повний текст джерелаSiretanu, Diana. "Fonctionnalisation de matériaux moléculaires magnétiques : vers des systèmes soluble et cristaux liquides." Thesis, Bordeaux 1, 2011. http://www.theses.fr/2011BOR14367/document.
Повний текст джерелаIn this thesis, we tried to develop hybrid magnetic material chemistry in order to get soft systems that can be easy-processable. This work deals with functionalization of the organic part of interesting molecule-based magnetic materials by groups known to induce liquid crystal phase or to increase the solubility. We achieved the rational functionalization of molecule-based magnetic materials, like (i) Single-Molecule Magnets (SMM), (ii) Spin Crossover (SC), and (iii) Electron Transfer (ET) systems, towards more soluble systems and liquid crystal phases.Chapter I contains general information about three important classes of magnetic complexes: SMMs, SC and ET systems. In order to illustrate the motivation of our work, a bibliographic study about hybrid magnetic materials is then presented. Rational ligand functionalization of SMMs and SC systems towards liquid crystalline phases are discussed in Chapter II and III, respectively. New functionalized Mn12 complexes, FeII/triazole-based and [FeII(LN2O2)(LN)2] systems were obtained. The conservation of magnetic properties after ligand functionalization was confirmed, but unfortunately, these new compounds do not show mesomorphic behaviour below the decomposition temperature. The Chapter IV is focused on ligand functionalization of ET complexes. Alkyl functionalization of the ligand provides a good solubility to these complexes, and the thermally-induced switchable behaviour observed in solid state has been successfully transferred to dilute solutions
Darbinean, Elena. "Fonctionnalisation rationnelle de matériaux moléculaires : vers des liquides et des cristaux-liquides magnétiques." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0556.
Повний текст джерелаDeveloping efficient methods to process molecular magnetic materials remains a considerable challenge and constitutes one of the critical steps toward possible applications. In this scope, the development magnetic hybrids featuring liquid crystal properties or improved solubility appears as a promising approach. This thesis work aimed to design, synthetize and characterize new hybridmaterials based on the single-molecule magnets (SMMs), spin crossover (SCO) and electrontransfer (ET) complexes. Chapter I contains general information and theoretical concepts on these three classes of magnetic complexes (SMMs, SCO and ET complexes), followed by a bibliographicsurvey on hybrid magnetic materials. Chapter II, rational is focused on the functionalization ofMn12-based SMM towards liquid crystalline phases. In Chapter III, a series of pyridylbenzohydrazone-based Fe(II) SCO complexes is investigated in both crystalline and soft matter phase. Chapter IV is dedicated to the study of cyanido-bridged {Fe2M2} molecular squares(M = Co(II), Ni(II)), which are known to exhibit SMM and thermally- or photo induced ET,respectively with Co(II) and Ni(II). In these three experimental chapters, the influence of ligand functionalization on self-organization, thermal and magnetic properties of the resulting materials is discussed in detail
Bayon, Chloé. "Microlentilles et micro-miroirs en cristal liquide cholestérique." Thesis, Toulouse 3, 2015. http://www.theses.fr/2015TOU30289/document.
Повний текст джерелаThe molecular structure of a cholesteric liquid crystal (CLC) is helical and gives rise to outstanding optical properties like the selective reflection of the light. Cholesteric structure raises fundamental questions such as the relationship between molecular chirality and mesoscopic chirality, and its impact on optical properties. It is omnipresent in biology (organisation of chitin, cellulose, collagen or chromatin). It is also used in technology: cosmetology, super-twisted nematic displays, reflective screens, temperature or pressure sensors, materials for photonic applications in general. The purpose of this work is to describe and understand the interaction of light with different types of non-monotonous helical structures elaborated in this thesis - synthetic cholesteric films (single-component or hybrid i.e. doped with gold nanoparticles) - or in a biological material (Chrysina gloriosa beetle). Several optical characterisation techniques have been used, depending on the sample to study and the questions which are rised. The main part of the manuscript is dedicated to cholesteric microlenses and micro-mirrors. We studied the cholesteric polygonal texture and highlighted that it acts as a chiral microlens array by using confocal microscopy coupled to spectrophotometry. These organic microlenses, developed in a two-step process by self-assembly, have the specificity of being wavelength-selective. We then showed that the polygonal texture of Chrysina gloriosa, as a biological analogous, is an array of spherical micro-mirrors and convergent microlenses. The second part of the manuscript is devoted to the elaboration of hybrid materials composed of CLC and gold nanoparticules and the study of their optical properties. Optical properties of these nanocomposites were probed using various techniques (plasmon resonance, Raman spectroscopy etc)
Farrell, Jason. "The influence of cation doping on the electronic properties of Sr₃Ru₂O₇." Thesis, St Andrews, 2008. http://hdl.handle.net/10023/689.
Повний текст джерелаCorkery, Robert, and robert corkery@anu edu au. "Artificial biomineralisation and metallic soaps." The Australian National University. Research School of Physical Sciences and Engineering, 1998. http://thesis.anu.edu.au./public/adt-ANU20080124.190014.
Повний текст джерелаPETIT, PIERRE. "Magnetisme et proprietes de conduction des derives cristallins et liquides cristallins de la bisphtalocyanine de lutecium : effet de dimensionnalite." Université Louis Pasteur (Strasbourg) (1971-2008), 1987. http://www.theses.fr/1987STR13163.
Повний текст джерелаMukherjee, Shriparna. "Development of Copper Telluride based Thermoelectric Materials Synthesis, Microstructure and Properties." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/4403.
Повний текст джерелаShih-WeiKo and 葛士瑋. "Electro-optical Properties of Axially Symmetrical Liquid Crystal Films based on Photo-alignment and Their Applications." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/96207570322440719080.
Повний текст джерела國立成功大學
光電科學與工程學系
100
In recent years, axially symmetric optical technology has been widely used in laser and optical systems, and has also been increasingly developed in communication, display, optoelectronics, and bio-photonics fields. However, building complex optical components are challenging in the design of axially symmetric optical systems. With the development of the optical and electrical properties of liquid crystal materials, liquid crystal is gradually used in the production of axially symmetric components. The axially symmetric liquid crystal device fabrication technology has been well developed, breaking through the traditional contact fabricating method using new non-contact production methods such as photo-alignment. This technique involves the doping of azo derivatives (e.g., azobenzene, azo dyes) in liquid crystal materials. The adsorption of azo dyes in a dye-doped liquid crystal (DDLC) film is achieved through a single pump beam. Light-induced dye adsorption is the main mechanism of liquid crystal photo-alignment, which conclusively results from the positive/negative torque effect, photoisomerization effect, and adsorption/desorption. Single-sided and double-side axially symmetric photo-alignment liquid crystal devices were produced via the method described above. This study consists of three experiments based on the fabricating technique of axially symmetric photo-alignment liquid crystal devices. (1) Using the optical properties of a single side axially symmetric photo-alignment liquid crystal device (homogeneous-radial device), we detected the variations of the disclination line in the spiral structure formed by liquid crystal molecules to measure the helical twisting power (HTP) of a chiral dopant in liquid crystal materials. The HTP measured using an axially symmetrical liquid crystal film is more accurate than that using other methods such as the Cano wedge cell and the reflective spectrum of a cholesteric liquid crystal. In addition, this novel method can be used for measuring very low doping concentrations of the chiral dopant in liquid crystal materials. (2) The special polarization converter, which is formed by combining these axially symmetric photo-alignment liquid crystal devices, can be applied to the axially symmetric optical system. The axially symmetric polarization converter can generate a special optical field and polarization for axially symmetric optics. Such axially symmetric liquid crystal devices can be modulated by applying voltage. These devices are useful for simplifying complex axially symmetric optical systems. Moreover, the special design of axially symmetric devices can be utilized for applications of laser systems. (3) The axially symmetric liquid crystal device can convert a Gaussian laser beam into a donut-shaped laser beam. Moreover, it can modulate the shape of a laser beam by applying voltage. Notably, this device can be used for infrared wavelength applied for biophotonics application, and can also be tuned by applying voltage. In addition, this novel liquid crystal device can be utilized in a simple optical system for converting a differently shaped laser beam (e.g., petal-type). The device developed in this study has substantially increased the value of the application and will contribute to the development of an optical tweezer system.
Che-JuHsu and 許哲儒. "Using photo-polymerization to improve electro-optical performance and realize polarization-independence in liquid crystal lenses." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/37484884161244610674.
Повний текст джерела國立成功大學
光電科學與工程學系
101
The hole-patterned LC lens possesses the advantages of simple fabrication and strong tunable-focus capability. However, because of non-uniform symmetrical electrical fields produced from a circular-hole electrode, the LC molecules in the hole-region easily orient along two opposite directions for homogeneous LC cells, leading to the formation of a disclination line. The disclination line will slow down the response time and lower the image quality. Based on our initial study on the large apertures of LC lenses, disclination lines and zigzag lines typically occur in cells. Unfortunately, zigzag lines and disclination lines will possibly link to each other and permanently stay in the cells to degrade the performance of LC lenses. Therefore, we experimentally study and conclude that suitable rubbing conditions in cells will effectively prevent the problem of linked lines. For convenient operation of the hole-patterned LC lens, we use the method of polymer stabilization to successfully prevent disclination lines in LC lenses. After successfully using the polymer stabilization method to prevent the occurrence of disclination lines, we further increase the concentration of monomers to fabricate coaxially bifocal (CB) LC lenses, and this method is called photo-polymerization. The characteristics of a tunable CB are clearly exhibited when the voltage applied is continuously increased, eventually disappearing until only one focus is left when significantly higher voltages are applied. We simultaneously demonstrate two types of tunable CB LC lenses fabricated via different photocurable processes, and then determine their optical functions. The study in the dissertation is based on LC lenses with a hole-patterned electrode. To effectively exploit the incident light, a dropping-flow alignment method is used to achieve radially symmetric LC distributions in the cell, through which tunable LC lenses can be made as linearly polarization independent. A 7 mm-diameter LC lens is fabricated with a circular hole-patterned electrode; its focal lengths are tunable from infinite to 27.5 cm when voltages from 0 Vrms to 80 Vrms are applied.
Gharleghi, Ahmad, and 阿美德. "Wet chemicals synthesis and thermoelectric properties of cobalt skutterudites semiconductors towards the electron-crystal phonon-glass materials." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/4emj24.
Повний текст джерела國立彰化師範大學
物理學系
102
This dissertation presents experimental practices conducted to study the effect of synthesis methods on the thermoelectric properties of n-type cobalt skutterudite. In this effort, wet chemical preparation procedures are adopted. The produced powders are characterized using x-ray diffraction pattern, scanning electron microscopy, Hall and density measurements. The Seebeck coefficient (thermopower), electrical and thermal conductivity measurements are performed for all the fabricated samples. Various reaction conditions have been carried out to stabilize the CoSb3 phase by modified polyol processes. The power factor of the parent CoSb3 is significantly enhanced via Ni substituting in Co site of Co4-xNixSb12 compounds (x= 0.0, 1.5ε, 2.5ε, 3.0ε, 4.0ε, and ε= 0.03125) synthesized by a rapid preparation procedure using modified polyol process. We have succeeded also in producing n-type CoSb3 using hydrothermal synthesis method. Different synthesis temperatures with reaction duration of time of 12 h are investigated to obtain the single phase of CoSb3. The remarkable low thermal conductivity of 1.33 - 1.46 Wm-1K-1 at room temperature is attained for the pristine CoSb3, which is comparable with or even lower than the filled CoSb3 obtained from solid state reaction. Enhancement of the power factor of CoSb3 samples synthesized using hydrothermal method is practiced via Ni-doping into the Co1-xNixSb3 structure with x=0.03215, 0.07 and 0.125. To study the effect of simultaneously electrons and holes doping on thermoelectric properties of CoSb3, we have succeeded in hydrothermally synthesizing co-doped Co1-x-yNixFeySb3 compounds with weighted compositions of {(x,y)}={(0.07,0.0), (0.07,0.03), (0.07,0.05), (0.14,0.10), (0.14,0.12), (0.14,0.14)}. The obtained results show thermal conductivity can be more reduced by co-doping of Ni and Fe, while the power factor is also enhanced. We have used solid state reaction to produce tungsten ditelluride. Based on the measured thermoelectric properties of produced WTe2 samples, we found it suitable candidate for investigating the thermoelectric properties of CoSb3 composite. As a result, the largest zT value of about 0.5 is achieved at 562 K for CoSb3 +yWTe2 composites for simultaneously y=3 and 12 wt. %. The In-filled InxCo4Sb12 compounds (x=0.25 and 0.50) are successfully produced using hydrothermal process combined with solid vapor reaction procedure. The largest room-temperature zT of 0.39 is attained for indium content, x=0.25. The thermal conductivity is reduced with increasing indium fillers. The density of InxCo4Sb12 bulks is increased markedly, which can confirm the insertion of In ions into the Sb-icosahedrons of Co4Sb12.
Shao, Hwang Sia. "Fabrication of Alignment Layer of Liquid Crystal Display by Electron Beam Lithography." 2005. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2707200512540900.
Повний текст джерелаSia, Shao Hwang, and 佘紹煌. "Fabrication of Alignment Layer of Liquid Crystal Display by Electron Beam Lithography." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/86532730581059262239.
Повний текст джерела國立臺灣大學
物理研究所
93
In the liquid crystal display (LCD) industry, alignment of liquid crystal is done by conventionally rubbing method. Although this method is very simple and convenient, there will be dust particle and electric static charge left on polymer. Also the mechanism is still unknown. In 1972, Berreman suggested that the alignment of liquid crystal after rubbing treatment to the surface is because of the ultrafine grooving structure formed and alignment along the grooving structure would reach a minimum energy. In the thesis, we try to create a new liquid crystal alignment method based on Berreman’s theoretical model to produce ultrafine grooving structure to be the alignment layer of liquid crystal by electron beam lithography. This would also avoid problems induced during rubbing. It is shown that the newly-developed alignment method has great behavior of liquid crystal alignment. Then we try to measure the azimuthal anchoring energy of a liquid crystal cell made by such method to quantitatively judge the degree of alignment, and observe the relation between the grating pitch and the azimuthal anchoring energy. We also measure the optical properties such as V-T curves and the response time of the LC aligned by different pitches of grooves to characterize the groove alignment method.
Wang, Li-shan, and 王儷珊. "Phase-Transition Behaviors and Electro-Optical characteristics of the Liquid Crystal Mixtures System with Ultra-Violet Photo-alignment Process." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/26406629650964095392.
Повний текст джерела國立臺灣科技大學
高分子系
98
This study of the use of synthetic lactic acid structures with double chiral centres liquid crystal (LC) material, in the experiment with polarized optical microscopy (POM) observation of the liquid crystal material from the isotropic temperature down to appear chiral smectic A phase (SmA*), it will produce the homeotropic texture of the LC phase; So, we hope that the SmA* phase LC materials by mixing photo-induced vertical alignment (VA) of the negative dielectric anisotropy LC (Nematic type LC)/acrylic monomer mixture systems, in order to auxiliary LC molecules to achieve the overall effect of the vertical arrangement of one of the main purpose of this experiments. The LC mixture systems in this VA mode, we observe the LC molecules arrangement condition by POM and the use of differential scanning calorimeter (DSC) to investigate the LC phase-transition behaviors. Finally, for the preliminary gray-scale characteristics of the LC mixture systems is also being explored.
Wu, Sheng-Ming, and 吳聲明. "The Electro-optical Characteristics of Optically Compensated Bend Liquid Crystal Display Mode with Controllable Pretilt Angle by Photo-curable Monomer." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/5vjhdw.
Повний текст джерела國立臺北科技大學
光電工程系研究所
95
In this study, the photo-curable monomer, which was used to form vertical alignment, was doped into liquid crystal (E7) at various proper concentrations and injected into empty parallel-aligned cell, so called “OCB Cell” or “π-cell”. In order to accomplish the initial bend or twist configuration to reduce the “Warm Up Time” of the π-cell, it was suffered from UV irradiation to stabilized at high pretilt angle. Four parts were presented to discuss. Besides, due to the characteristics of the polymer, the polymer bundles mostly existed near the substrate. Therefore, there is good optical contrast because of light scattering free. We study the LC molecular alignment and electro-optical characteristics by observing the polarizing optical microscopy, voltage to transmission curve, phase retardation, response time and horizontal viewing angle. In addition, we verified the experimental results by simulation software “DIMOS”. We found that the higher pretilt angle could be accomplished by more curing time, larger curing voltage and higher polymer concentration. And we also discuss the electro-optical characteristics of the twist-π configuration. Although the experimental result were not we expected, it proved that LC molecules could be stabilized at various alignment configuration, including splay, twist and bend state.
WU, JUI-CHE, and 吳睿哲. "Electro-Optical Characteristics of High Contrast Ratio Liquid Crystal Device with Copolymer Films Photo Induce Vertical Alignment Novel Copolymer Films." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/2re3ds.
Повний текст джерела國立臺灣科技大學
材料科學與工程系
104
The optimal preparation methods and the electro-optical properties of high contrast liquid crystal device by photo induce vertical alignment will be studied. In the study, the research use non-contact photo-polymerization induced liquid crystal (LC) and pre-polymer to form a vertical alignment (VA) effect of pseudo-Polymer thin film after the phase separation. In the molecular structure design, the research utilize photo-curable acrylic pre-polymer, (alkyl long carbon chain and main chain biphenol type etc.) and mix photo-initiator and negative dielectric anisotropy type liquid crystal (NLC) etc. component together. Forming the homogeneous LC mixture solution (NLC/photo-curable acrylic pre-polymer mixture systems) is via enough stirred and ultrasonic vibration. The research use photo-polymerization induced phase separation (PIPS) effect, and to make the NLC and the photo-curable acrylic pre-polymer generate composite layer structure of the vertical alignment copolymer film (VACOF) after the Ultra-Violet (UV) light irradiation process. The photo alignment of this novel technology can not only improve the traditional rubbing alignment shortcoming but also promote yield of the process. Our goal is expecting toward shortening the process for manufacture and decreasing the cost of the panel.
Kiyono, Hajime. "Structural studies of 2-, 3- and 4-pyridinecarboxylic acid methyl esters by gas-phase electron diffraction and 1H-NMR using a liquid crystal solvent." Doctoral thesis, 1997. http://hdl.handle.net/2115/32569.
Повний текст джерелаDas, Subhadip. "Raman Study of gated devices in two-dimensional materials and pressure effects." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5312.
Повний текст джерелаChaudhury, Srabanti. "Modelling Stochasticity In Selected Biological Processes." Thesis, 2008. https://etd.iisc.ac.in/handle/2005/821.
Повний текст джерелаChaudhury, Srabanti. "Modelling Stochasticity In Selected Biological Processes." Thesis, 2008. http://hdl.handle.net/2005/821.
Повний текст джерелаCorkery, Robert. "Artificial biomineralisation and metallic soaps." Phd thesis, 1998. http://hdl.handle.net/1885/46251.
Повний текст джерела