Academic literature on the topic 'Liquid crystal colloids'

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Journal articles on the topic "Liquid crystal colloids"

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Smalyukh, Ivan I. "Liquid Crystal Colloids." Annual Review of Condensed Matter Physics 9, no. 1 (March 10, 2018): 207–26. http://dx.doi.org/10.1146/annurev-conmatphys-033117-054102.

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Dierking, Ingo. "Liquid crystal colloids." Liquid Crystals Today 27, no. 2 (April 3, 2018): 22–23. http://dx.doi.org/10.1080/1358314x.2018.1479158.

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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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Muševič, Igor. "Nematic Liquid-Crystal Colloids." Materials 11, no. 1 (December 25, 2017): 24. http://dx.doi.org/10.3390/ma11010024.

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Yuan, Ye, Angel Martinez, Bohdan Senyuk, Mykola Tasinkevych, and Ivan I. Smalyukh. "Chiral liquid crystal colloids." Nature Materials 17, no. 1 (November 27, 2017): 71–79. http://dx.doi.org/10.1038/nmat5032.

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Tasinkevych, M., N. M. Silvestre, and M. M. Telo da Gama. "Liquid crystal boojum-colloids." New Journal of Physics 14, no. 7 (July 13, 2012): 073030. http://dx.doi.org/10.1088/1367-2630/14/7/073030.

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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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Sudha, Devika Gireesan, Jocelyn Ochoa, and Linda S. Hirst. "Colloidal aggregation in anisotropic liquid crystal solvent." Soft Matter 17, no. 32 (2021): 7532–40. http://dx.doi.org/10.1039/d1sm00542a.

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We report on colloidal aggregation in the nematic liquid crystal phase. Luminescent colloids are self-assembled in situ, providing a unique method to study large-scale hierarchical assembly in an anisotropic solvent.
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Shrivastav, Gaurav P., and Sabine H. L. Klapp. "Anomalous transport of magnetic colloids in a liquid crystal–magnetic colloid mixture." Soft Matter 15, no. 5 (2019): 973–82. http://dx.doi.org/10.1039/c8sm02090f.

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Liu, Qingkun, Paul J. Ackerman, Tom C. Lubensky, and Ivan I. Smalyukh. "Biaxial ferromagnetic liquid crystal colloids." Proceedings of the National Academy of Sciences 113, no. 38 (September 6, 2016): 10479–84. http://dx.doi.org/10.1073/pnas.1601235113.

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The design and practical realization of composite materials that combine fluidity and different forms of ordering at the mesoscopic scale are among the grand fundamental science challenges. These composites also hold a great potential for technological applications, ranging from information displays to metamaterials. Here we introduce a fluid with coexisting polar and biaxial ordering of organic molecular and magnetic colloidal building blocks exhibiting the lowest symmetry orientational order. Guided by interactions at different length scales, rod-like organic molecules of this fluid spontaneously orient along a direction dubbed “director,” whereas magnetic colloidal nanoplates order with their dipole moments parallel to each other but pointing at an angle to the director, yielding macroscopic magnetization at no external fields. Facile magnetic switching of such fluids is consistent with predictions of a model based on competing actions of elastic and magnetic torques, enabling previously inaccessible control of light.
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Dissertations / Theses on the topic "Liquid crystal colloids"

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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 director field of the liquid crystals could be imaged in combination with precise observation of the colloid locations. Custom image analysis algorithms are developed to extract the information. In the first system, we create an interface between a cholesteric liquid crystal and an isotropic liquid. Homeotropic anchoring leads to a well aligned cholesteric layer and the formation of the fingerprint texture. Fluorescent colloidal particles with planar surface anchoring are dispersed in the CLC. A majority of these particles decorate the interface. The final distribution of particles perpendicular to the interface has a clear dependence on the particle size. In the plane of the interface, surface defects form a template for the colloids. The second system is a particle dispersion within a short pitch CLC which exhibits a blue phase. The colloidal particles and associated defects act as nucleation sites for the blue phase in the cholesteric to blue phase transition. Colloidal particles cause localised melting from the blue phase to the isotropic phase and lead to a larger temperature range for coexistence between isotropic and blue phases. Furthermore, the isotropic regions can be faceted, their shape and size is controlled by the blue phase elasticity. In the final system, a nematic emulsion is created. Droplets of nematic LC are dispersed in water. Colloidal particles initially mixed into the liquid crystal decorate the interface between the two fluids. The addition of a surfactant switches the liquid crystal alignment at the fluid-fluid interface from planar to homeotropic. This forces a change in defect structure, from two boojums at the poles to a hedgehog defect in the droplet centre. The presence of colloids affects the switching dynamics and alters the final liquid crystal alignment preventing the droplets from forming a central radial defect. There is a symbiotic relationship between the particle properties - size and anchoring at the surface - and the elastic properties of the liquid crystal in the bulk and in the presence of an interface with an isotropic fluid. How the systems respond when the balance of these factors is altered is explored throughout the thesis.
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Lavery, Roan. "Dynamics and structure of liquid crystal colloids." Thesis, University of Edinburgh, 2001. http://hdl.handle.net/1842/11037.

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This thesis sets out to investigate the dynamic and structural properties of liquid crystal colloids. In themselves the fields of colloidal and liquid crystal science have been well studied, but the combination of these produces a wealth of new physics which has provoked much interest over the past few years. The research began by investigating the dynamics of dilute suspensions of colloidal particles in the isotropic phase of liquid crystal near the nematic transition. It was found that the particles exhibit an anomalously low diffusion which was explained in terms of the formation of an ordered layer of liquid crystal molecules surrounding the particles even when the bulk phase was disordered. It was also discovered around this time that due to the preparation procedure the particle could become coated with a thin layer of another type of solvent which dramatically affected the particle diffusion and this lead to an offshoot study in this area. It was found that the diffusion of these coated particles was much faster than expected because of a change to the boundary conditions at the particle surface as a solvent coating caused partial slip boundary conditions which altered the diffusion. Latterly the nature of this coating was investigated more and a hydrodynamic model employed to compare experimental results with the predictions given by the theory. It was found that these were in good agreement. The focus of investigation then changed, focusing on more concentrated systems of colloidal particles in liquid crystal solvents as these exhibited unusual structural phenomena. It was seen that a concentrated suspension of particles in liquid crystal shows a huge increase in the rigidity of the material in its nematic phase, compared with the pure liquid crystal. This is due to the creation of a honeycomb-like aggregate particle network, which increases the elastic strength of the material. The network formation was observed using microscopy and the elastic modulus was measured rheologically to be many orders of magnitude higher than the pure liquid crystal alone. The role of cooling rate from the isotropic to nematic phase was also investigated thoroughly as this has a large impact on the final structure of the material.
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Hwang, Hyerim. "Crystal-Liquid Transitions Studied With Colloids in an Electric Bottle." Thesis, Harvard University, 2016. http://nrs.harvard.edu/urn-3:HUL.InstRepos:33493595.

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In this thesis, we have presented the experimental investigations on the crystal-liquid transitions in a colloidal system. Colloids behave as big atoms, thus they are good model systems to study the dynamics of condensed matter. Their phases are determined by the particle concentration which can be controlled by external forces. We studied the transitions such as crystallization and melting in a controlled way. With a confocal microscopy, we were able to obsserve the transitions at single particle level in three-dimension. In Chapters 2-3, we introduced the electric bottle setup which played a significant role to induce the transitions in this thesis. The electric bottle was designed to generate inhomogeneous electric fields, and we were able to employ dielectrophoresis to manipulate the particle concentration using this setup. The colloidal suspension we used here is composed of PMMA particles (Ɛp=2.3), the mixture of cis-decalin and tetrachloroethylene (Ɛm = 2.6$), and surfactant AOT molecules to give repulsive interaction between the particles. We also introduced analysis methods to obtain particle location information from the raw confocal images and to distinguish between the crystal and liquid phases by using their different structures. In Chapters 4-6, we investigated the crystal-liquid transitions and a crystal-crystal transition. We studied the growth kinetics in crystallization and melting in a system which is covalent to the collision-limited growth of pure metals. We measured the attachment and detachment rates, which can be denoted as jump rates. It was found that the process is governed by the Brownian motion of the particles which is dealing with the random walk. The free energy difference between the two phases gives bias to the random walk, thus we insist that the growth process is a biased random walk. We also studied the equilibrated interfaces in a BCC crystal-liquid system. We measured the equilibrium fluctuations of the interface, which gives an interfacial stiffness of the interface. Although the orientation of the interface plane doesn't have high-rotational symmetry, the stiffness was observed to be isotropic in a long wavelength limit. The last transition we observed is the one between crystals, BCC and FCC crystals. We explored the crystal-liquid transitions at single particle level using the combination of the electric bottle and colloids. Instead having multiple samples to study the phase behaviors as a function of volume fraction, we were able to obtain a concentration-dependent phase diagram in a single electric bottle sample. The design of the sample cell can be further developed to induce the various kinds of density gradient. Also, many other phase behaviors resulted from different type of interactions can be studied.
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Cleaver, Julie. "Network formation in mixtures of nematic liquid crystal and colloids." Thesis, University of Edinburgh, 2004. http://hdl.handle.net/1842/14543.

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Mixtures of thermotropic liquid crystal (5CB) and colloid (polymethylmethacrylate) particles have been studied. When these composites are cooled through the isotropic-nematic (IN) phase transition an optically switchable material is formed with an unusually high storage modulus. Previous studies have shown that the particles form into an interconnected network. In this thesis the mechanism of network formation, and the morphological and mechanical properties of the network are explored. Time-resolved laser scanning confocal microscopy (LSCM) is used to achieve near-single-particle resolution and observe the kinetics of the network formation upon cooling from the initial isotropic dispersion. As the mixture is cooled below the IN transition temperature (TIN), the particles are expelled by growing droplets of nematic liquid crystal to form the walls of a three dimensional network. This process takes the order of 30 seconds (dependent upon cooling rate), but the IN transition of the pure liquid crystal is much quicker. The presence of impurities adsorbed onto the particles before they are dispersed in liquid crystal could be responsible for this. These impurities open up a biphasic region in the phase diagram and slow down interface movement. Calorimetric data are consistent with this interpretation. Microscopy observations show that upon heating above TIN single particles become free and exhibit Brownian motion. As the sample is heated deep into the isotropic phase the network is broken up but clusters of particles remain. Sedimentation of these clusters causes a density gradient of particles to form across the sample with varying height and upon cooling a new network of particles or ‘clusters of particles’ is formed.
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Zhang, Ke. "Microparticles as a new analytical method to study liquid crystal colloids." [Kent, Ohio] : Kent State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=kent1145051154.

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Thesis (Ph.D.)--Kent State University, 2006.
Title from PDF t.p. (viewed Sept. 19, 2006). Advisor: John L. West. Keywords: nematic isotropic interface, liquid crystal colloids, dielectrophoresis, microparticle, drag effect, Raman mapping, IR imaging. Includes bibliographical references (p. 152-164).
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Zarubin, Grigorii [Verfasser], and Siegfried [Akademischer Betreuer] Dietrich. "Ferromagnetic colloids in liquid crystal solvents / Grigorii Zarubin ; Betreuer: Siegfried Dietrich." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2018. http://d-nb.info/118548759X/34.

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ZHANG, KE. "Microparticles as a new analytical method to study liquid crystal colloids." Kent State University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=kent1145051154.

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Sigdel, Krishna P. "Phase transition studies of liquid crystal colloids with solvents and nano-solids." Digital WPI, 2011. https://digitalcommons.wpi.edu/etd-dissertations/137.

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Liquid crystals (LCs) are anisotropic fluids that exhibit numerous thermodynamically stable phases in between an isotropic liquid and a three-dimensionally ordered solid. In their simplest ordered phase, the nematic, LCs show orientational order due to molecular self assembly and at the same time maintaining fluid flow properties. In the smectic phase, they show both orientational and partial translational order characterized by a 1-d density wave. Liquid crystalline substances have been extensively studied due to their applications and as important physical models of self-assembly. The effect of the disorder and impurities on LC systems is an important and challenging problem to the fundamental understanding of phases ordering or self-assembly and continually attracts the attention of researchers. The disordered systems often display complex and rich phenomena, being the generalization of the pure (ideal) systems. Disorder can dramatically alter the physical properties of multi-component, composite systems. In particular, the effect of disorder on phase transitions is important as the disorder typically couples to the order parameter, which can be usefully described as a random local field that is conjugate to the order parameter. This is usually realized in systems with random inclusions in a phase ordering media, e.g., a colloidal dispersion of solids in a complex fluid. Another form of disorder is presented by dilution effects, which imposes instead the random breaking or weakening of intermolecular bonds or interactions responsible for the phase ordering. Exploring a good physical system representing random dilution effects in a controlled manner offers a physical probe to unresolved problems in the understanding of mesophasic order. This Dissertation presents a series of studies of dilution and different form of disorder effect on liquid crystal phase transitions. We have used high-resolution AC-calorimetry, dielectric spectroscopy as well as polarizing microscopy to characterize the effects of solvent such as hexane, acetone, decane, and nanomaterials such as multiwall carbon nanotubes and ferroelectric nanoparticles on the phase transitions of several liquid crystals. The liquid crystals of interest are: pentylcyanobiphenyl (5CB), octylcyanobiphenyl (8CB), and decylcyanobiphenyl (10CB). Studies have been carried out as a function of solvent, nanotube, and nanoparticles concentration and temperature spanning the isotropic to nematic (I-N), nematic to smectic-A (N-SmA), and isotropic to smectic-A (I-SmA) phase transitions.
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Sengupta, Anupam. "Nematic Liquid Crystals and Nematic Colloids in Microfluidic Environment." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2012. http://hdl.handle.net/11858/00-1735-0000-000E-00FA-B.

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Buyuktanir, Ebru Aylin. "Electro-optical Characterization of Bistable Smectic A Liquid Crystal Displays." Kent State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=kent1207869606.

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Books on the topic "Liquid crystal colloids"

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

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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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Muševič, Igor. Liquid Crystal Colloids. Springer, 2018.

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Hiroshi, Watanabe, and International Symposium on Dynamics of Macromolecules by Electric and Optical Methods. 1988 : Tokyo, Japan), eds. Dynamic behavior of macromolecules, colloids, liquid crystals and biological systems by optical and electro-optical methods. Tokyo: Hirokawa Publishing Company, 1988.

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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 "Liquid crystal colloids"

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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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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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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. "Nematic Microdroplets, Shells and Handlebodies." In Liquid Crystal Colloids, 213–47. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-54916-3_7.

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Muševič, Igor. "Topological Particle-Like Structures in Chiral Nematics." In Liquid Crystal Colloids, 249–56. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-54916-3_8.

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Muševič, Igor. "Photonic Properties of Nematic Microdroplets." In Liquid Crystal Colloids, 257–84. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-54916-3_9.

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Vollmer, D., A. B. Schofield, and G. Hinze. "Network formation in suspensions of colloids and liquid crystal: reversibility – memory effects." In Mesophases, Polymers, and Particles, 76–81. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/b100306.

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Conference papers on the topic "Liquid crystal colloids"

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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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Wang, Mengfei, Everett Rhinehalt, Emine Kemiklioglu, Jeoung-Yeon Hwang, and Liang-Chy Chien. "Colloids mediated liquid crystal blue phases." In SPIE OPTO, edited by Liang-Chy Chien, Dick J. Broer, Vladimir Chigrinov, and Tae-Hoon Yoon. SPIE, 2013. http://dx.doi.org/10.1117/12.2009513.

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Glushchenko, Anatoliy, Chae Il Cheon, John West, and Yuri Reznikov. "Applications of ferroelectric particles/liquid crystal colloids." In Integrated Optoelectronic Devices 2007, edited by Liang-Chy Chien. SPIE, 2007. http://dx.doi.org/10.1117/12.703688.

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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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Oh-e, Masahito, Hiroshi Yokoyama, Mattijs Koeberg, Euan Hendry, and Mischa Bonn. "THz time-domain spectroscopy of liquid crystal colloids." In Integrated Optoelectronic Devices 2007, edited by Liang-Chy Chien. SPIE, 2007. http://dx.doi.org/10.1117/12.712004.

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Noh, JungHyun, Irena Drevensek-Olenik, Jun Yamamoto, and Jan P. F. Lagerwall. "Dynamic and complex optical patterns from colloids of cholesteric liquid crystal droplets." In SPIE OPTO, edited by Liang-Chy Chien, Harry J. Coles, Hirotsugu Kikuchi, and Ivan I. Smalyukh. SPIE, 2015. http://dx.doi.org/10.1117/12.2180516.

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Ibragimov, T. D., A. R. Imamaliyev, and G. M. Bayramov. "Peculiarities of electro-optic properties of the ferroelectric particles-liquid crystal colloids." In REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION: Proceedings of the 35th Annual Review of Progress in Quantitative Nondestructive Evaluation. American Institute of Physics, 2016. http://dx.doi.org/10.1063/1.4945966.

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Putin, Gennady F., and Alexandra A. Bozhko. "Gravitational and Magnetic Convection in Magnetic Colloids." In ASME 2005 Fluids Engineering Division Summer Meeting. ASMEDC, 2005. http://dx.doi.org/10.1115/fedsm2005-77242.

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Experiments were performed to examine the influence of homogeneous magnetic field on convection instability and flows in a layer of magnetic fluid heated from one wide side and cooled from another. The temperature sensors were used for measurement of heat transport across the layer. Visualization of flow patterns was provided by a liquid crystal sheet. The results indicate that with the help of a magnetic field it is possible to control the convection stability, intensity of the heat transfer and the form of convection motions. The interaction of gravitational and magnetic convection mechanisms for different orientations of the layer and magnetic field were studied. The essential influence of gravitational sedimentation of magnetic particles and their aggregates on convection in magnetic colloids is shown. A number of non-linear regimes of convection, including localized states and repeated long-wave transients from convection to conduction were observed.
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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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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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