Academic literature on the topic 'Colloidal liquid crystals'

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Journal articles on the topic "Colloidal liquid crystals"

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Dierking, Ingo. "From colloids in liquid crystals to colloidal liquid crystals." Liquid Crystals 46, no. 13-14 (August 23, 2019): 2057–74. http://dx.doi.org/10.1080/02678292.2019.1641755.

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Wang, Yiwei, Pingwen Zhang, and Jeff Z. Y. Chen. "Formation of three-dimensional colloidal crystals in a nematic liquid crystal." Soft Matter 14, no. 32 (2018): 6756–66. http://dx.doi.org/10.1039/c8sm01057a.

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Draude, Adam P., and Ingo Dierking. "Lyotropic Liquid Crystals from Colloidal Suspensions of Graphene Oxide." Crystals 9, no. 9 (August 31, 2019): 455. http://dx.doi.org/10.3390/cryst9090455.

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Lyotropic liquid crystals from colloidal particles have been known for more than a century, but have attracted a revived interest over the last few years. This is due to the developments in nanoscience and nanotechnology, where the liquid crystal order can be exploited to orient and reorient the anisotropic colloids, thus enabling, increasing and switching the preferential properties of the nanoparticles. In particular, carbon-based colloids like carbon nanotubes and graphene/graphene–oxide have increasingly been studied with respect to their lyotropic liquid crystalline properties over the recent years. We critically review aspects of lyotropic graphene oxide liquid crystal with respect to properties and behavior which seem to be generally established, but also discuss those effects that are largely unfamiliar so far, or as of yet of controversial experimental or theoretical outcome.
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Mundoor, Haridas, Sungoh Park, Bohdan Senyuk, Henricus H. Wensink, and Ivan I. Smalyukh. "Hybrid molecular-colloidal liquid crystals." Science 360, no. 6390 (May 17, 2018): 768–71. http://dx.doi.org/10.1126/science.aap9359.

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Rahman, Muklesur, and Wei Lee. "Electric-Field Effects in Dilute Suspensions of Carbon Nanotubes Dispersed in Nematic Liquid Crystals." Key Engineering Materials 428-429 (January 2010): 173–81. http://dx.doi.org/10.4028/www.scientific.net/kem.428-429.173.

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Colloids composed of liquid-crystal hydrosols exhibit a rich set of interesting phenomena. The coupling between liquid-crystalline media and colloidal particles plays an essential role leading to an abundant source of new physics. In the last few years, peculiar behaviors of carbon-nanotube-doped calamitic liquid crystals have attracted considerable attention. This paper provides a brief introduction to this alluring subject for its on-going research development in this laboratory. First presented are our current understandings of the nematic colloidal system comprising carbon nanotubes and of their possible orientation and dynamics under the application of an external field. Various electro-optical and electrical properties of a liquid-crystal display rectified by the nanoscale carbonaceous guest are then addressed to a larger extent. Dielectric relaxation obtained from a nematic impregnated with carbon nanotubes is also discussed. With historical significance for the dawn of the liquid-crystal–carbon-nanotube research, several important findings of enhanced nonlinear optical properties in typical nematic mesomaterials consisting of suspended nanotubes are delineated. With the new colloidal systems of elongated nanoscale solids dispersed in anisotropic fluids in the mesophase, many new intriguing phenomena are awaiting theoretical and experimental explorations. Collaborations are called to draw attention of interested theoretical physicists, in particular.
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Skinner, Thomas O. E., Dirk G. A. L. Aarts, and Roel P. A. Dullens. "Real-Space Analysis of Grain Boundary Fluctuations in Two Dimensional Colloidal Crystals." Materials Science Forum 715-716 (April 2012): 901. http://dx.doi.org/10.4028/www.scientific.net/msf.715-716.901.

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The characteristics of grain boundary motion and evolution are of fundamental importance in material science. Optical microscopy is used to analyse grain boundary fluctuations in two-dimensional colloidal crystals. Colloidal systems are particles (colloids) on the order of 1µm dispersed in a solvent where they display rich phase behaviour of colloidal 'crystal', liquid' and 'gas' phases. They are widely used as a model system to study many fundamental issues in condensed matter physics and statistical mechanics. The intrinsic slowness and increased length scales of colloidal systems make them an excellent model system to study grain boundaries as an analogy to atomic systems. Static and dynamic correlation functions are compared with capillary wave theory to calculate the grain boundary mobility and stiffness. These fundamental properties of grain boundaries determine the kinetics of curvature-driven grain growth.
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Li, Yunfeng, Elisabeth Prince, Sangho Cho, Alinaghi Salari, Youssef Mosaddeghian Golestani, Oleg D. Lavrentovich, and Eugenia Kumacheva. "Periodic assembly of nanoparticle arrays in disclinations of cholesteric liquid crystals." Proceedings of the National Academy of Sciences 114, no. 9 (February 13, 2017): 2137–42. http://dx.doi.org/10.1073/pnas.1615006114.

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An important goal of the modern soft matter science is to discover new self-assembly modalities to precisely control the placement of small particles in space. Spatial inhomogeneity of liquid crystals offers the capability to organize colloids in certain regions such as the cores of the topological defects. Here we report two self-assembly modes of nanoparticles in linear defects-disclinations in a lyotropic colloidal cholesteric liquid crystal: a continuous helicoidal thread and a periodic array of discrete beads. The beads form one-dimensional arrays with a periodicity that matches half a pitch of the cholesteric phase. The periodic assembly is governed by the anisotropic surface tension and elasticity at the interface of beads with the liquid crystal. This mode of self-assembly of nanoparticles in disclinations expands our ability to use topological defects in liquid crystals as templates for the organization of nanocolloids.
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Mirri, Giorgio, V. S. R. Jampani, George Cordoyiannis, Polona Umek, Paul H. J. Kouwer, and Igor Muševič. "Stabilisation of 2D colloidal assemblies by polymerisation of liquid crystalline matrices for photonic applications." Soft Matter 10, no. 31 (2014): 5797–803. http://dx.doi.org/10.1039/c4sm00358f.

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Frenkel, Daan, Peter Bladon, Peter Bolhuis, and Maarten Hagen. "Liquid-like behavior in colloidal crystals." Physica B: Condensed Matter 228, no. 1-2 (October 1996): 33–39. http://dx.doi.org/10.1016/s0921-4526(96)00332-8.

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Senyuk, Bohdan, Manoj B. Pandey, Qingkun Liu, Mykola Tasinkevych, and Ivan I. Smalyukh. "Colloidal spirals in nematic liquid crystals." Soft Matter 11, no. 45 (2015): 8758–67. http://dx.doi.org/10.1039/c5sm01539a.

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Dissertations / Theses on the topic "Colloidal liquid crystals"

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Yasarawan, Nuttawisit. "Dye-doped colloidal liquid crystals." Thesis, University of Bristol, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.503864.

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This thesis presents three experimental studies using model suspensions of dye-doped colloidal sepiolite clay rods. In all cases, dye molecules adsorbed onto the outer surfaces of the rods were removed by Soxhlet extraction, yielding dye-doped rods which were then sterically stabilised in toluene. The liquid crystalline phase behaviour of these rods was examined and was similar to that observed previously for undyed particles. The isotropic-nematic phase boundary was as expected for hard spherocylinders of the same aspect ratios; however the transition was broadened due to polydispersity of the rods. Aligning the dyedoped rods in a 9 T magnetic field resulted in a single-domain nematic phase with a marked dichroism. This was due to the restricted orientations of the dye molecules within the zeolitic channels of sepiolite. The order parameter of the dye in the aligned colloidal rods was up to 0.5, similar to typical values for dye in aligned molecular liquid crystals.
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Dammone, Oliver James. "Confinement of colloidal liquid crystals." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:f33c315d-263b-47ad-ace8-1658c532a9c3.

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The behavior of colloidal liquid crystals in confinement is addressed on the single particle level using laser scanning confocal microscopy. We seek to disentangle how equilibrium director fields are controlled by the complex interplay between confinement, elasticity and surface anchoring. First, we study the nematic phase confined to wedge structured channels. Varying the wedge opening angle leads to a splay to bend transition mediated by a defect in the bulk of the wedge. Our results are in quantitative agreement with lattice Boltzmann simulations, and we show that comparison between experiments and simulation yields a new method to obtain the splay-to-bend elasticity ratios of colloidal and biological liquid crystals. Next, we extend our study of the wedge structured channels to the cholesteric phase, and measure a splay to twist transition with increasing wedge angle. We directly visualise the 3D nature of the twisted state, and explain how the transition is intricately determined by the anchoring strength and the splay, bend, and twist elasticities. Next, we investigate the effect of rectangular confinement on the nematic phase. The rectangle aspect ratio is systematically varied and we observe five distinct director fields. Comparison with computations of the Frank-Oseen energies yields the extrapolation length, which we find to be of the order of the rod length. Next, we confine the nematic phase to annular geometries of varying dimensions, and observe the novel director fields that are adopted. We approach a level of confinement which is of the order of the particle size. Interpreting our observations with Monte Carlo simulations, which take into account the finite size of the particles, illuminates the applicability of continuum theories down to microscopic lengthscales. We finish with a study of the isotropic-nematic interface in bulk and confinement. We show that parallel anchoring occurs at the interface, and measure the width of the interface to be of the order of the rod length.
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Stark and Holger. "Physics of Inhomogeneous Nematic Liquid Crystals: Colloidal Dispersions." Thesis, Universitaet Stuttgart, 1999. http://elib.uni-stuttgart.de/opus/volltexte/2001/746/index.html.

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Speranza, Alessandro. "Effects of length polydiversity in colloidal liquid crystals." Thesis, King's College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397810.

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Foffano, Giulia. "Colloidal dispersions in active and passive liquid crystalline fluids : a simulation study." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/11756.

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In this thesis we study the physics of colloidal dispersions in active and passive liquid crystals by computer simulations. Liquid crystals are materials that exhibit long-range orientational order, with characteristics intermediate between the ones of simple, isotropic fluids and the ones of crystalline solids. Active fluids are suspensions of particles that continuously stir their ambient fluid. Like liquid crystals, active fluids undergo phase transitions to orientationally ordered phases. The framework that we apply here to describe them extends hydrodynamic equations for liquid crystals to the active case, in which their constituent particles exert local stresses on the simple fluid in which they are embedded. Studying systems of colloids embedded in these materials can be done with multiple aims. Here we use colloids as probe particles to investigate the rheological properties of active nematics. To do so we apply a constant force to a spherical particle embedded therein and define an effective viscosity, which we determine by measuring the velocity in steady state. We find an important dependence of the effective viscosity on the size of the particle, and a regime characterised by a steady state of negative drag. We also consider collective properties for systems of many colloids and analyse how they are affected by activity. We find that spontaneous flow can either hinder or favour colloidal aggregation, depending mainly on whether a fixed orientation of the liquid crystal is imposed close to the colloidal surface. This remains true independently of the initial condition chosen for the liquid crystal, which only affects the transition to spontaneous flow.
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Fischermeier, Ellen [Verfasser], Klaus [Gutachter] Mecke, and Jens [Gutachter] Harting. "Simulations of Colloidal Liquid Crystals / Ellen Fischermeier ; Gutachter: Klaus Mecke, Jens Harting." Erlangen : FAU University Press, 2016. http://d-nb.info/1120120632/34.

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Fischermeier, Ellen [Verfasser], Klaus R. [Gutachter] Mecke, and Jens [Gutachter] Harting. "Simulations of Colloidal Liquid Crystals / Ellen Fischermeier ; Gutachter: Klaus Mecke, Jens Harting." Erlangen : FAU University Press, 2016. http://d-nb.info/1120120632/34.

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Stark, Holger. "Physics of inhomogeneous nematic liquid crystals colloidal dispersions and multiple scattering of light /." [S.l. : s.n.], 1999. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB8921083.

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Tait, James Robert. "Optical trapping of colloidal core-shell particles in organic solvents and in liquid crystals." Thesis, University of Bristol, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.445881.

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Mirzaei, Javad. "Optical and Electro-optical Properties of Nematic Liquid Crystals with Nanoparticle Additives." The Royal Society of Chemistry, 2011. http://hdl.handle.net/1993/30280.

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Liquid crystals (LCs) are an interesting class of materials that are attracting significant attention due to their ever-growing applications in a wide variety of fields such as liquid crystal display (LCD) technology, materials science and bioscience. In recent years, along with the developments of materials at the nanoscale, doping LCs with nanoparticles (NPs) has emerged as a very promising approach for improving LC properties. Nanoparticle additives can introduce novel effects on optical and electro-optical properties of nematic liquid crystals (N-LCs), such as altered molecular alignment, faster response time and increased efficiency. This thesis studies the impacts that the inclusion of metallic NPs made of gold or semiconductor CdSe quantum dots (QDs), have on optical and electro-optical properties of N-LCs. Using polarized optical microscopy and detailed capacitance and transmittance measurements of nematic mixtures in electro-optic test cells, characteristics such as optical texture, phase transition temperatures, switching voltages and dielectric anisotropy are investigated in pure as well as doped samples. Surface ligands in NPs and their chemical functionalization play an important role in the LC-NP interactions, largely by determining the dispersibility of NPs and stability of the nanocomposites. One important objective of this thesis is to investigate and prepare a series of gold nanoparticles (Au NPs) with specially formulated robust coatings that maximizes solubility and stability in LC medium. Silanization of NPs is developed as a method to overcome the stability challenge. The functionalization of silanized NPs with aliphatic ligands or liquid crystalline molecules, provides chemically and thermally stable NPs with hydrophobic and structurally compatible surfaces required for dispersion in N-LCs. After complete characterization the synthesized particles are used to make the new nematic nanocomposites. By analysis of the structure-property relationships governing LC-nanomaterial composites and by comparison of new results and data from previous studies on other types of NPs, this thesis will further reveal the mechanism of the interrelations between host LC molecules and NP, considering the role of variables such as core composition, size and surface chemistry of NPs (e.g. siloxane shell, aliphatic ligand vs. liquid crystalline ligand) in achieving stable LC composites with desired optical and electro-optical properties.
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Books on the topic "Colloidal liquid crystals"

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Liquid crystals with nano and microparticles. [Hackensack] New Jersey: World Scientific, 2015.

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Muševič, Igor. Liquid Crystal Colloids. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-54916-3.

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Kirsanov, E. A. Techenie dispersnykh i zhidkokristallicheskikh sistem. Ivanovo: Ivanovskiĭ gos. universitet, 2006.

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Kirsanov, E. A. Techenie dispersnykh i zhidkokristallicheskikh sistem. Ivanovo: Ivanovskiĭ gos. universitet, 2006.

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Sensitive matter: Foams, gels, liquid crystals, and other miracles. Cambridge, Mass: Harvard University Press, 2012.

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Hamley, Ian W. Introduction to soft matter: Synthetic and biological self-assembling materials. Chichester, West Sussex, England: John Wiley & Sons, 2007.

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Allen, Michael P., and Dominic J. Tildesley. Computer Simulation of Liquids. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198803195.001.0001.

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This book provides a practical guide to molecular dynamics and Monte Carlo simulation techniques used in the modelling of simple and complex liquids. Computer simulation is an essential tool in studying the chemistry and physics of condensed matter, complementing and reinforcing both experiment and theory. Simulations provide detailed information about structure and dynamics, essential to understand the many fluid systems that play a key role in our daily lives: polymers, gels, colloidal suspensions, liquid crystals, biological membranes, and glasses. The second edition of this pioneering book aims to explain how simulation programs work, how to use them, and how to interpret the results, with examples of the latest research in this rapidly evolving field. Accompanying programs in Fortran and Python provide practical, hands-on, illustrations of the ideas in the text.
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Muševič, Igor. Liquid Crystal Colloids. Springer, 2018.

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Hamley, Ian W. Introduction to Soft Matter: Polymers, Colloids, Amphiphiles and Liquid Crystals. Wiley, 2000.

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Introduction to Soft Matter: Polymers, Colloids, Amphiphiles and Liquid Crystals. Wiley, 2000.

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Book chapters on the topic "Colloidal liquid crystals"

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Vroege, Gert Jan. "Colloidal Systems." In Biaxial Nematic Liquid Crystals, 305–18. Chichester, UK: John Wiley & Sons, Ltd, 2015. http://dx.doi.org/10.1002/9781118696316.ch12.

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Stark, H., A. Borštnik, and S. Žumer. "Liquid Crystal Colloidal Dispersions." In Defects in Liquid Crystals: Computer Simulations, Theory and Experiments, 37–85. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-0512-8_3.

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Bleasdale, T. A., and G. J. T. Tiddy. "Surfactant Liquid Crystals." In The Structure, Dynamics and Equilibrium Properties of Colloidal Systems, 397–414. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-011-3746-1_27.

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Muševič, Igor. "2D and 3D Colloidal Crystals and Superstructures." In Liquid Crystal Colloids, 119–48. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-54916-3_4.

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Tovkach, O. M., S. B. Chernyshuk, and B. I. Lev. "Colloidal Particles in Confined and Deformed Nematic Liquid Crystals: Electrostatic Analogy and Its Implications." In Springer Proceedings in Physics, 113–60. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-80924-9_5.

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Muševič, Igor. "Colloidal Particles of Complex Topology in Nematics." In Liquid Crystal Colloids, 185–212. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-54916-3_6.

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Muševič, Igor. "Entanglement of Nematic Colloids." In Liquid Crystal Colloids, 149–84. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-54916-3_5.

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Muševič, Igor. "Introduction." In Liquid Crystal Colloids, 1–23. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-54916-3_1.

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Muševič, Igor. "Dipolar and Quadrupolar Nematic Colloids." In Liquid Crystal Colloids, 25–97. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-54916-3_2.

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Muševič, Igor. "Optical Trapping and Manipulation of Nematic Colloids." In Liquid Crystal Colloids, 99–118. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-54916-3_3.

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Conference papers on the topic "Colloidal liquid crystals"

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Evans, Julian S., Nan Wang, and Sailing He. "Biphasic and colloidal liquid crystal systems." In Liquid Crystals XXII, edited by Iam Choon Khoo. SPIE, 2018. http://dx.doi.org/10.1117/12.2323487.

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Kaczmarek, Malgosia, Ingrid A. Membrillo Solis, Tetiana Orlova, Karolina Bednarska, Piotr Lesiak, Tomasz R. Wolinski, Giampaolo D'Alessandro, and Jacek Brodzki. "From optical to topological data analysis of colloidal and structured liquid crystals." In Liquid Crystals XXV, edited by Iam Choon Khoo. SPIE, 2021. http://dx.doi.org/10.1117/12.2594168.

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Löwen, H., H. H. Wensink, M. Rex, Michio Tokuyama, Irwin Oppenheim, and Hideya Nishiyama. "Driven Colloidal Mixtures and Colloidal Liquid Crystals." In COMPLEX SYSTEMS: 5th International Workshop on Complex Systems. AIP, 2008. http://dx.doi.org/10.1063/1.2897801.

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Dündar, Mehmet A., Christina Christova, Andrei Y. Silov, Fouad Karouta, Richard Nötzel, Martijn Wienk, Huub Salemink, and Rob W. van der Heijden. "Activating photonic crystal membrane nanocavities by infiltrating with liquid crystals or luminescent colloidal nanocrystals." In SPIE Photonics Europe, edited by Hernán R. Míguez, Sergei G. Romanov, Lucio C. Andreani, and Christian Seassal. SPIE, 2010. http://dx.doi.org/10.1117/12.854211.

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Gupta, Man Prakash, and Satish Kumar. "A Dissipative Particle Dynamics Study of Liquid Crystals Under Electric Field." In ASME 2013 4th International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/mnhmt2013-22125.

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We study the equilibrium and dynamic behavior of liquid crystals (LCs) under dc and ac electric field using a mesoscopic simulation technique, Dissipative Particle Dynamics (DPD). We quantify the reorientation of LC molecules and the change in their anisotropic character under external perturbation by an order parameter. We find that the electric field magnitude has to be above a critical value to initiate the reorientation of the director of the LC system along the applied electric field, which is consistent with the experimental observations. The response time of the reorientation process decreases as the magnitude of the electric increases for the dc fields. The effect of ac field frequency on the order parameter is correlated with the field amplitude. The cyclic variation in the order parameter follows the ac field when the oscillation period is greater than the response time of the system and the amplitude is greater than the critical value. Results suggest that the DPD technique can provide important insights in to the dynamic behavior of LC system under both dc and ac electric fields. This technique can further be applied to examine the properties of colloidal LCs which can be very useful for many practical applications.
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Lavrentovich, Oleg D., Chenhui Peng, Yubing Guo, Sergij V. Shiyanovskii, and Qi-Huo Wei. "Controlling statics and dynamics of colloids by photo-patterned liquid crystals (Conference Presentation)." In Liquid Crystals XX, edited by Iam Choon Khoo. SPIE, 2016. http://dx.doi.org/10.1117/12.2236421.

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Yamamoto, T., Y. Tabe, and H. Yokoyama. "Photochemical manipulation of colloidal structures in liquid-crystal colloids." In International Congress on Optics and Optoelectronics, edited by Milada Glogarova, Peter Palffy-Muhoray, and Martin Copic. SPIE, 2007. http://dx.doi.org/10.1117/12.722656.

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Davidson, Patrick, Samir Abbas, Laurent M. Dupont, Ivan N. Dozov, and Corinne Chanéac. "Optical filter based on Fabry-Perot structure using a colloidal suspension of goethite ([alpha]-FeOOH) nanorods as electro-optic material." In Emerging Liquid Crystal Technologies XIII, edited by Igor Muševič, Liang-Chy Chien, Dirk J. Broer, and Vladimir G. Chigrinov. SPIE, 2018. http://dx.doi.org/10.1117/12.2301290.

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Nag, Okhil K., James B. Delehanty, and Jawad Naciri. "Liquid crystal nanoparticles for delivery of photosensitizers for photodynamic therapy." In Colloidal Nanoparticles for Biomedical Applications XIII, edited by Xing-Jie Liang, Wolfgang J. Parak, and Marek Osiński. SPIE, 2018. http://dx.doi.org/10.1117/12.2289970.

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Figueiredo Neto, Antônio M., Daniel Espinosa, Dennys Reis, and Cristiano L. P. de Oliveira. "Influence of an external magnetic field in the two-photon absorption coefficient of magnetite nanoparticles in colloids and thin films (Conference Presentation)." In Emerging Liquid Crystal Technologies XIV, edited by Liang-Chy Chien. SPIE, 2019. http://dx.doi.org/10.1117/12.2502912.

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