Bibliographies thématiques / Liquid Crystal Nanocomposites

Littérature scientifique sur le sujet « Liquid Crystal Nanocomposites »

Auteur : Grafiati
Publié le 7 septembre 2023

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Articles de revues sur le sujet "Liquid Crystal Nanocomposites"

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Lee, H. L., M. Abu Bakar, J. Ismail et A. M. Issam. « SYNTHESIS AND CHARACTERIZATION OF CdS IN DIOL VANILIN LIQUID CRYSTAL MONOMER ». Indonesian Journal of Chemistry 7, no 2 (20 juin 2010) : 128–36. http://dx.doi.org/10.22146/ijc.21687.

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Nanocomposites comprising diol-vanilin and cadmium sulfide (CdS) has been synthesized via chemical precipitation method in ethanol at refluxed temperature (160 oC) for 12 hours. CdCl2. 2.5H2O and thiourea as cadmium and sulfide precursors respectively were employed. Diol vanilin is a thermotropic liquid crystal monomer which exhibits enantiotropic nematic metaphase texture when observed under polarizing microscope and confirmed by DSC thermal stability study. A series of different mass composition of diol vanilin and CdS nanocomposites ranging from 0.1:1.0 till 1.0:1.0(w/w) were prepared and characterized using XRD, TEM, SEM-EDX, POM and DSC. The X-ray diffraction pattern (XRD) showed broad peaks due to the formation of cubic CdS nanoparticles in diol vanilin matrix. The nanocomposites at low mass composition of CdS still maintained their nematic phase. However, the liquid crystal property was affected when the mass composition of CdS in nanocomposite was increased and the liquid crystal characteristic vanished when the mass composition was at 0.6:1.0. . Keywords: CdS, diol vanilin, thermotropic liquid crystal, nanocomposite.
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Kaiser, Andreas, Moritz Winkler, Simon Krause, Heino Finkelmann et Annette M. Schmidt. « Magnetoactive liquid crystal elastomer nanocomposites ». J. Mater. Chem. 19, no 4 (2009) : 538–43. http://dx.doi.org/10.1039/b813120c.

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Roohnikan, Mahdi, Violeta Toader, Alejandro Rey et Linda Reven. « Hydrogen-Bonded Liquid Crystal Nanocomposites ». Langmuir 32, no 33 (9 août 2016) : 8442–50. http://dx.doi.org/10.1021/acs.langmuir.6b02256.

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Rudenko, Valentyn, Anatolii Tolochko, Svitlana Bugaychuk, Dmytro Zhulai, Gertruda Klimusheva, Galina Yaremchuk, Tatyana Mirnaya et Yuriy Garbovskiy. « Probing Optical Nonlinearities of Unconventional Glass Nanocomposites Made of Ionic Liquid Crystals and Bimetallic Nanoparticles ». Nanomaterials 12, no 6 (11 mars 2022) : 924. http://dx.doi.org/10.3390/nano12060924.

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In this paper, we report the synthesis and characterization of unconventional nanocomposites made of bimetallic nanoparticles dispersed in a liquid crystal glass. Core-shell bimetallic nanoparticles (Ag/Au or Au/Ag) and Ag-Au bimetallic nanoalloys are synthesized using cadmium alkanoate glass-forming liquid crystals as nanoreactors. Optical spectra of the produced glassy nanocomposites exhibit a distinctive absorption peak due to a surface plasmon resonance. In addition, these unusual materials demonstrate a strong nonlinear–optical response probed by means of the Z-scan technique. The use of near-infrared (1064 nm) and visible (532 nm) nanosecond laser pulses reveal a variety of nonlinear–optical mechanisms that depend on the composition of the studied nanocomposites. Our results indicate that metal alkanoate-based glass-forming ionic liquid crystals with embedded plasmonic nanoparticles are promising, yet they are overlooked photonic nanomaterials suitable for optical and nonlinear-optical applications.
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Budaszewski, Daniel, Kaja Wolińska, Bartłomiej Jankiewicz, Bartosz Bartosewicz et Tomasz Ryszard Woliński. « Spectral Properties of Photo-Aligned Photonic Crystal Fibers Infiltrated with Gold Nanoparticle-Doped Ferroelectric Liquid Crystals ». Crystals 10, no 9 (4 septembre 2020) : 785. http://dx.doi.org/10.3390/cryst10090785.

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This paper describes our recent results on light propagation in photonic crystal fibers (PCFs) partially infiltrated with W212 ferroelectric liquid crystal (FLC) doped with 1–3 nm gold nanoparticles (NPs) with a concentration in the range of 0.1–0.5% wt. Based on our previous results devoted to PCFs infiltrated with nematic liquid crystals (NLCs) doped with gold NPs (GNPs), we extend our research line with FLCs doped with these NPs. To enhance the proper alignment of the NP-FLC nanocomposites inside PCFs, we applied an additional photo-aligning layer of SD-1 azo-dye material (DIC, Japan). Electro-optical response times and thermal tuning were studied in detail. We observed an improvement in response times for NP-FLC nanocomposites in comparison to the undoped FLC.
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Kempaiah, Ravindra, Yijing Liu, Zhihong Nie et Rajratan Basu. « Giant soft-memory in liquid crystal nanocomposites ». Applied Physics Letters 108, no 8 (22 février 2016) : 083105. http://dx.doi.org/10.1063/1.4942593.

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Pushpavathi, N., et K. L. Sandhya. « Photoluminescence study of liquid crystal-ZnO nanocomposites ». Journal of Molecular Liquids 274 (janvier 2019) : 724–29. http://dx.doi.org/10.1016/j.molliq.2018.11.037.

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Kausar, Ayesha. « Review of fundamentals and applications of polyester nanocomposites filled with carbonaceous nanofillers ». Journal of Plastic Film & ; Sheeting 35, no 1 (20 juin 2018) : 22–44. http://dx.doi.org/10.1177/8756087918783827.

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Polyester is a versatile commercially significant polymer (thermoplastic/thermoset) well-known for its biodegradability and excellent thermal, mechanical, and chemical properties. Synthetic aromatic polyester resins usually have better moisture resistance, nonflammability, liquid crystal, strength, thermal, and environmental features compared with natural/aliphatic polyesters. Nanofillers can reinforce these important polymers to further enhance the final nanocomposite structural and physical characteristics. This review presents research devoted to polyester nanocomposites with essential nanofillers such as; nanodiamond, fullerene, carbon nanotube, graphene, and graphene oxide. High-performance polyester/nanocomposites have been developed based on modified polyester design, nanofiller functionality, and optimized interaction between matrix and nanofiller. This article also presents state-of-the-art technological development in the field of polyester/nanocomposites predominantly in supercapacitors, fuel cells, shape memory materials, electromagnetic shielding materials, textiles, and biomedical appliances. Furthermore, future scenarios in scientific development of these nanocomposites are discussed.
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Basta, Altaf H., Vivian F. Lotfy, Jehane A. Micky et Aya M. Salem. « Cellulose Ether-Based Liquid Crystal Materials : Review Article ». Journal of Research Updates in Polymer Science 10 (29 novembre 2021) : 69–83. http://dx.doi.org/10.6000/1929-5995.2021.10.9.

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The development of liquid crystal materials via nanotechnology has become an interesting subject of research in optical material chemistry. One of the significant nanomaterials is cellulose-based nanoparticles. In this review article, we highlighted the classification of liquid crystal materials (LCs), and types of cellulose-NPs and their characterization as LCs materials. Finally, we present our promising data on the synergistic effect of cellulose-NPs on liquid crystal behavior of ethyl cellulose- and hydroxypropyl cellulose- nanocomposites.
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Chausov, D. N., A. D. Kurilov et V. V. Belyaev. « Liquid Crystal Nanocomposites Doped with Rare Earth Elements ». Liquid Crystals and their Application 20, no 2 (30 juin 2020) : 6–22. http://dx.doi.org/10.18083/lcappl.2020.2.6.

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Thèses sur le sujet "Liquid Crystal Nanocomposites"

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Fox, Anna E. Fontecchio Adam. « A study of optical propagation in polymer liquid crystal nanocomposites for photolithography applications / ». Philadelphia, Pa. : Drexel University, 2009. http://hdl.handle.net/1860/3106.

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Lu, Xiaoyun. « Design and study of lyotropic liquid crystal-butyl rubber nanocomposites for chemical agent vapor barrier applications ». Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3284451.

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Alqahtany, Faleh. « From water soluble mesogens to liquid crystal gold nanocomposites : synthesis and investigation of flexible chain variation in rod-shaped mesogens ». Thesis, University of Hull, 2015. http://hydra.hull.ac.uk/resources/hull:13218.

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A number of new liquid crystalline systems were synthesized and the liquid crystal phase behaviour was investigated. The investigation of the liquid crystal properties involved the characterisation of the neat substances by optical polarizing microscopy (OPM), differential scanning calorimetry (DSC) and for selected samples by x-ray diffraction (XRD) of magnetically aligned sample. The molecular architectures explored are based on a number of rod shaped architectures functionalized with either alkyl groups or ethylenoxy groups, at both ends of the central aromatic core, or at one terminus. The number was increased to three ethylenoxy chains. Additionally, for selected mesogen the results of the LC behaviour on the attachment gold nanoparticles was investigated. For the materials bearing ethylenoxy chains the mesomorphic phase behaviour on mixing with water was investigated by OPM of a number of selected mixtures.
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Bandyopadhyay, Jayita. « Effects of nano-clay on the structure and properties of thermotropic liquid crystal polymer an its blends with poly (ethylene terephthalate) ». Thesis, Université Laval, 2011. http://www.theses.ulaval.ca/2011/28280/28280.pdf.

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Xu, Peicheng. « Self-assembly of surface-modified clays for functional biomimetic materials ». Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/289449.

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Synthetic Laponite-clay particles with a platelet-like shape display strong gelation when dispersed in aqueous solutions because of their positively charged rims and negatively charged flat surfaces. In this thesis, my aim was to modify the surfaces of these clay particles such that we can both access their liquid crystalline (LC) discotic phase and further build transparent and mechanically resilient coatings with a 3D "brick-and-mortar" structure that is similar to that observed in natural mother of pearl (nacre). I first introduce a simple strategy that successfully suppresses Laponite's ageing phenomenon and enables the system's isotropic-to-LC phase transition. By grafting Laponite particle surfaces with comb-like polymers, poly (L-lysine)-g-poly (ethylene glycol) (PLL-PEG), I was able to screen negative surface charges and ensure steric stabilisation. Besides using long-chain polymers, I also coated the positively charged Laponite rims with small, barrel-shaped molecules cucurbit[7]uril (CB[7]). By carefully tuning the ratio between CB[7] and Laponite, the system experienced a macroscopic phase separation into a Laponite-poor suspension and a birefringent LC gel. Inspired by the hierarchical structure of nacre, here I also demonstrate a simple approach to fabricate polymer-clay hybrid films via a water-evaporation process. In this third method, Laponite platelets were bridged by natural abundant polymers (carboxymethyl cellulose) through hydrogen bonding. This hybrid material possesses high transparency, flexibility and an outstanding fire-retardant property. After Ca2+ ion-coordination of these cellulose-Laponite composite films, the interface between the polymers and clays was further strengthened, leading to enhanced mechanical properties along with improved thermal- and water-resistance. I also present that using Dextran as a depletant, sterically stabilised Laponite can access its liquid crystal phase under low clay concentration. Finally, I show that Laponite can be coated with various polymers (PEO, chitosan, sodium alginate) for the purpose of obtaining LC gels and hybrid films. I believe that our findings on surface-modification of clay particles can open new routes to large-scale and inexpensive production of bio-inspired functional materials.
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Kalakonda, Parvathalu. « Thermal Physical Properties Of Nanocomposites Of Complex Fluids ». Digital WPI, 2013. https://digitalcommons.wpi.edu/etd-dissertations/301.

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"Composites of nanoparticles with complex fluids represent a unique physical system where thermal physical properties of the components partially or fully mix and new behavior can emerge. Traditional composites are relatively well understood as the superposition, weighted by volume or mass, of the components properties and the interfacial interactions play the role of holding the composite together. As the filler component, nanoparticle, decreases in size, the surface area begins to dominate, leading to unique behavior of the nanocomposites. The richness of the nanocomposites that can be designed by coupling various nanoparticles and complex fluid materials opens a wide field of active research. This dissertation presents a series of experimental studies on various nanocomposites using modulated differential scanning calorimetry, spectroscopic ellipsometry, dielectric spectroscopy, polarizing microscopy, and conductivity measurements of nanoparticles such as multi-wall carbon nanotubes and quantum dots on the phase transitions of several liquid crystals and polymers. The liquid crystals (LCs) and liquid crystalline polymer (LCP) of interest are: negative dielectric anisotropy alkoxyphenylbenzoate (9OO4), octylcyanobiphenyl (8CB), decylcyanobiphenyl (10CB), and isotactic polypropylene (iPP) which can form smectic liquid crystal (LC) phase. Studies have been carried out as a function of concentration and temperature spanning through various ordered phases. The results indicate a mixture of ordering and disordering effects of the nanoparticles on the phases of the complex fluids. In 9OO4/CNT system, dipole moment of liquid crystal and graphene like surface can allow a random dispersion of CNT to promote both orientational and positional order. For nCB/CNT, nCB/Quantum dot (QD) systems, nanoparticles induce net disordering effect in LC media. The effect of QDs on LC depends on the anchoring conditions and the QDs size. The results clearly demonstrate that the nematic phase imposes self-assembly on QDs to form one dimensional arrays. This leads to net disordering effect. The thermal/electrical conductivity changes in thin films of iPP/CNT sheared/un-sheared samples and it also varies with temperature for the purpose of inducing anisotropy of those properties in parallel and perpendicular to average orientation. The percolation threshold is clearly pronounced in both conductivities due to pressing and shearing treatment of the films. This will further our abilities to nano-engineer material for many important applications."
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Gutierrez, Cuevas Karla Guadalupe Gutierrez. « LIQUID CRYSTALLINE NANOCOMPOSITES : FROM ACHIRAL TO CHIRAL SYSTEMS ». Kent State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=kent1500998489695319.

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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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Pin, Jean-Mathieu. « Matrices thermodurcissables époxydes et furaniques biosourcées – conception d’assemblages macromoléculaires ». Thesis, Nice, 2015. http://www.theses.fr/2015NICE4027/document.

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Le travail de recherche présenté dans cette thèse s’est orienté vers l’élaboration de matériaux avancés et la conception de polymères/composites biosourcés. Ce dernier sujet a été entrepris à travers la combinaison de différentes matières premières biosourcées qui sont connues comme ayant un grand potentiel de substitution des monomères pétrosourcés. Tout d’abord, un travail fondamental a été exécuté en combinant l’huile de lin epoxydée (ELO) avec des dérivés d’anhydrides d’acides comme agents de réticulation, afin de relier la réactivité chimique de polymérisation à la structure du réseau formé et aux propriétés thermomécaniques. Afin de devenir économiquement viable, les bio-raffineries doivent urgemment valoriser les sous-produits issus de la conversion de la biomasse. Fort de ce constat, une deuxième étude sur l’incorporation et la copolymérisation d’une quantité importante d’humins (résidu hétérogène obtenu durant la conversion des sucres en hydroxymethylfurfural (HMF)) avec de l’alcool furfurylique (FA) a été réalisée avec succès afin de créer de nouvelles résines thermodures. Une autre voie proposée consiste en la combinaison de ELO et de FA à travers une polymérisation cationique, dans l’idée de créer de nouvelles résines totalement biosourcées, générant ainsi une gamme de matériaux aux propriétés mécaniques modulables
The research work presented in this thesis was oriented on advanced thermoset materials and also on the conception of bio-based polymers and composites. This last topic has been investigated by the combination of different bio-based raw materials which are well-known to have a great potential to substitute the petroleum monomers. Firstly, a fundamental work has been done on the combination of epoxidized linseed oil (ELO) and anhydrides as cross-linkers, which links the polymerization reactivity with the network structure and thermomechanical properties. For being economically realistic, the bio-refineries are urged to valorize the sidestream products issued from biomass conversion. In that respect, a second study investigated successfully the incorporation and copolymerization of an important amount of humins (heterogeneous residues obtained during the sugar conversion into hydroxymethylfurfural (HMF)) with furfuryl alcohol (FA) in order to create new resins. Another proposed combination, focused on ELO and FA cationic copolymerization with the purpose to create new fully bio-based resins with tailored mechanical properties. Concerning the elaboration of advanced polymers and composites, a reflection around the hierarchically organized natural materials has been achieved in order to adapt the self-organization and structuration concepts to polymeric network
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Kharkov, Boris. « Molecular Order and Dynamics in Nanostructured Materials by Solid-State NMR ». Doctoral thesis, KTH, Tillämpad fysikalisk kemi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-160636.

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Organic-inorganic nanostructured composites are nowadays integrated in the field of material science and technology. They are used as advanced materials directly or as precursors to novel composites with potential applications in optics, mechanics, energy, catalysis and medicine. Many properties of these complex materials depend on conformational rearrangements in their inherently dynamic organic parts. The focus of this thesis is on the study of the molecular mobility in ordered nanostructured composites and lyotropic mesophases and also on the development of relevant solid-state NMR methodologies. In this work, a number of new experimental approaches were proposed for dipolar NMR spectroscopy for characterizing molecular dynamics with atomic-level resolution in complex solids and liquids. A new acquisition scheme for two-dimensional dipolar spectroscopy has been developed in order to expand the spectral window in the indirect dimension while using limited radio-frequency power. Selective decoupling of spin-1 nuclei for sign-sensitive determination of the heteronuclear dipolar coupling has been described. A new dipolar recoupling technique for rotating samples has been developed to achieve high dipolar resolution in a wide range of dipolar coupling strength. The experimental techniques developed herein are capable of delivering detailed model-independent information on molecular motional parameters that can be directly compared in different composites and their bulk analogs. Solid-state NMR has been applied to study the local molecular dynamics of surfactant molecules in nanostructured organic-inorganic composites of different morphologies. On the basis of the experimental profiles of local order parameters, physical motional models for the confined surfactant molecules were put forward. In layered materials, a number of motional modes of surfactant molecules were observed depending on sample composition. These modes ranged from essentially immobilized rigid states to highly flexible and anisotropically tumbling states. In ordered hexagonal silica, highly dynamic conformationally disordered chains with restricted motion of the segments close to the head group have been found. The results presented in this thesis provide a step towards the comprehensive characterization of the molecular states and understanding the great variability of the molecular assemblies in advanced nanostructured organic−inorganic composite materials.

QC 20150225

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Livres sur le sujet "Liquid Crystal Nanocomposites"

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ZnO bao mo zhi bei ji qi guang, dian xing neng yan jiu. Shanghai Shi : Shanghai da xue chu ban she, 2010.

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Liquid Crystal Polymer Nanocomposites. Elsevier, 2022. http://dx.doi.org/10.1016/c2019-0-01063-1.

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Semkin, Artem, P. M. Visakh et Zeynep Guven Ozdemir. Liquid Crystal Polymer Nanocomposites. Woodhead Publishing, 2021.

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Visakh, P. M., Artem Semkin et Zeynep Guven Ozdemir. Liquid Crystal Polymer Nanocomposites. Elsevier Science & Technology, 2022.

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Chapitres de livres sur le sujet "Liquid Crystal Nanocomposites"

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Barzic, Andreea Irina, Raluca Marinica Albu et Luminita Ioana Buruiana. « Liquid Crystal Polymers ». Dans High Performance Polymers and Their Nanocomposites, 27–58. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2018. http://dx.doi.org/10.1002/9781119363910.ch2.

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Patro, Ch Kartikeshwar, Aakarti Garg, Rohit Verma, Ravindra Dhar et Roman Dabrowski. « Thermodynamic Characteristics of Liquid Crystal-Nanocomposites ». Dans Springer Proceedings in Physics, 111–15. Singapore : Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-8625-5_12.

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Satapathy, Pragnya, Divya Jayoti et S. Krishna Prasad. « Liquid Crystals in One-Dimensional Polymeric Nanonetworks : Physics and Applications ». Dans One-Dimensional Polymeric Nanocomposites, 91–106. Boca Raton : CRC Press, 2022. http://dx.doi.org/10.1201/9781003223764-6.

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Madhav, B. T. P., et V. G. K. M. Pisipati. « Liquid crystal and liquid crystal polymer antennas ». Dans Liquid Crystal Polymer Nanocomposites, 213–34. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-12-822128-0.00008-x.

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Prakash, Jai, Ajay Kumar et Shikha Chauhan. « Liquid crystals/liquid crystal polymers nanocomposites for memory applications ». Dans Liquid Crystal Polymer Nanocomposites, 117–40. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-12-822128-0.00004-2.

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Mohana, K., S. Umadevi et V. Ganesh. « Liquid crystalline elastomer based nanocomposites ». Dans Liquid Crystal Polymer Nanocomposites, 23–67. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-12-822128-0.00007-8.

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Müller Cardoso, Carolina, et Carolina Ferreira de Matos. « Liquid crystalline polymer/nanoplatelet nanocomposites ». Dans Liquid Crystal Polymer Nanocomposites, 69–90. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-12-822128-0.00003-0.

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Aljabali, Alaa A. A., Kaushik Pal, Murtaza M. Tambuwala et Kamal Dua. « Liquid crystalline polymer-based bio-nanocomposites for spectroscopic applications ». Dans Liquid Crystal Polymer Nanocomposites, 141–62. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-12-822128-0.00009-1.

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Aljabali, Alaa A. A., Marlin Baral, Carolina Müller Cardoso, Shikha Chauhan, Nima Dalir, Kamal Dua, V. Ganesh et al. « Contributors ». Dans Liquid Crystal Polymer Nanocomposites, ix—x. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-12-822128-0.09992-1.

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Loiko, V. A., A. V. Konkolovich, A. A. Miskevich, M. N. Krakhalev, O. O. Prishchepa, A. V. Shabanov et V. Ya Zyryanov. « Electro-optical response of a monolayer polymer dispersed nematic liquid crystal film doped with surfactant ». Dans Liquid Crystal Polymer Nanocomposites, 163–211. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-12-822128-0.00006-6.

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Actes de conférences sur le sujet "Liquid Crystal Nanocomposites"

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Hogan, Ben, Monica Craciun et Anna Baldycheva. « 2D Material Liquid Crystal Nanocomposites for Optoelectronic and Photonic Devices ». Dans Frontiers in Optics. Washington, D.C. : OSA, 2018. http://dx.doi.org/10.1364/fio.2018.jw3a.26.

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Singh, Gautam, Michael R. Fisch et Satyendra Kumar. « Electrically tunable photoluminescence of semiconducting quantum dots doped nematic liquid crystal nanocomposites ». Dans 2ND INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5032773.

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Khan, Muhammad Omer, Ellen Chan, Siu N. Leung, Hani Naguib, Francis Dawson et Vincent Adinkrah. « Multifunctional Liquid Crystal Polymeric Composites Embedded With Graphene Nano Platelets ». Dans ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/smasis2011-5123.

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This paper studies the development of new multifunctional liquid crystal polymeric composites filled with graphene nano platelets (GNPs) for electronic packaging applications. A series of parametric studies were conducted to study the effect of GNP content on the thermal conductivity of LCP-based nanocomposites. Graphene, ranging from 10 wt. % to 50 wt. %, were melt-compounded with LCP using a twin-screw compounder. The extrudates were ground and compression molded into small disc-shaped specimens. The thermal conductivity of LCP matrix was observed to have increased by more than 1000% where as the electrical conductivity increased by 13 orders of magnitude with the presence of 50 wt% GNP fillers. The morphology of the composites was analyzed using SEM micrographs to observe the dispersion of filler within the matrix. These thermally conductive composites represent potential cost-effective materials to injection mold three-dimensional, net-shape microelectronic enclosures with superior heat dissipation performance.
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da Silveira, Nádya Pesce, Françoise Ehrburger-Dolle, Cyrille Rochas, Arnaud Rigacci, Fabiano Vargas Pereira, Aloir Antonio Merlo, Harry Westfahl et Rogério Magalhaes Paniago. « Smectic ordering in polymer liquid crystal-silica aerogel nanocomposites. Studies of DSC and SAXS. » Dans SYNCHROTRON RADIATION IN MATERIALS SCIENCE : Proceedings of the 6th International Conference on Synchrotron Radiation in Materials Science. AIP, 2009. http://dx.doi.org/10.1063/1.3086223.

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Reven, Linda, Jason Wong, Manlin Zhang, Stephan Kouame et Violeta Toader. « LC nanocomposites : polymer functionalized nanoparticles ». Dans Liquid Crystals XXIV, sous la direction de Iam Choon Khoo. SPIE, 2020. http://dx.doi.org/10.1117/12.2579897.

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Rohatgi, Aashish, William R. Pogue, Jared N. Baucom et James P. Thomas. « Microstructural and Mechanical Characterization of Carbon Nanofiber Reinforced Composites ». Dans ASME 2006 Multifunctional Nanocomposites International Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/mn2006-17038.

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Carbon nanofibers, such as single walled carbon nanotubes (SWNT), multiwalled carbon nanotubes (MWNT) and vapor-grown carbon nanofibers (VGCF or VGCNF) are routinely compounded with polymers to create thermally and electrically conductive polymer nanocomposites. Our group is interested in combining the conduction with structural functionality by reinforcing a high-performance thermotropic liquid crystal polymer (LCP) matrix with vapor-grown carbon nanofibers and single walled carbon nanotubes. High strength and stiffness can be achieved in LCPs through the alignment of molecular domains during high-shear mixing and extrusion. Further strength and stiffness enhancements are potentially possible if the carbon nanofibers could also be aligned, perhaps, with the assistance of the aligned domains of the LCP matrix. However, the geometrical structure of VGCF is quite different and the diameter is one to two orders of magnitude larger than that of SWNT. Therefore, the processing conditions and the interactions between the LCP domains and the nanofibers are expected to lead to different dispersion and alignment characteristics of VGCF and SWNT within the LCP matrix. In this work, twin-screw and Maxwell-type mixer-extruders were used to produce neat LCP filaments and LCP-nanofiber composite filaments with various concentrations of VGCF and SWNT. The dispersion and orientation of the VGCF and SWNT reinforcements were determined by X-ray diffraction and electron microscopy. The filaments were loaded in quasi-static uniaxial tension until fracture to determine the tensile modulus, strength and strain-to-failure. The mechanical properties showed a strong dependence on the filament diameter, nanofiber concentration and processing parameters. A significant increase in mechanical performance was observed with decreasing filament diameter irrespective of the carbon nanofiber concentration. Fracture surfaces examined under electron microscopy revealed hierarchical features at multiple length scales. At the macroscopic scale, a skin-core configuration was observed in the filament cross-section with the skin possessing a greater degree of LCP molecular alignment and nanofiber alignment than the core. The mechanical and electrical properties of the LCP, LCP-VGCF and LCP-SWNT nanocomposite filaments will be described and related to processing parameters, the type of carbon nanofibers (VGCF or SWNT) and the resulting composite microstructure.
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Wang, Wei, Sehoon Chang et Gawain Thomas. « Scale-Up Fabrication and Microfluidic Evaluation of Janus Graphene Nanofluids as Novel EOR Agent ». Dans Middle East Oil, Gas and Geosciences Show. SPE, 2023. http://dx.doi.org/10.2118/213484-ms.

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Abstract Nanofluid flooding is an emerging enhanced oil recovery (EOR) technique whereby injection fluids containing nanoparticles or nanocomposites are utilized for the oil displacement or injectivity improvement in oil reservoirs. However, current nanofluids with conventional nanoparticles have relatively low efficiency for EOR at simulated reservoir conditions, especially at low concentrations of nanoparticles. This research reported a new cost-effective method for scale-up synthesis of Janus graphene nanosheets and demonstrated a new type of nanomaterials, Janus nanofluids, as highly effective alternative nano-agents for EOR applications. A lyotropic liquid crystal phase as a novel "interfacial nano-reactor" system has been developed for fabricating Janus nanomaterials at nano-scaled liquid-liquid interfaces. Compared to interfacial reaction in a conventional bi-phase system, the new "interfacial nano-reactors" could tremendously enlarge the interfacial area by more than million times for chemical reactions at the interface, and thus allow production of Janus nanomaterials in mass quantity economically for industrial applications. Janus graphene nanosheets synthesized via this method have been characterized and confirmed by multiple techniques including scanning electron microscopy (SEM), Langmuir-Blodgett (LB) isotherm, contact angle, and interfacial tension (IFT) measurements. Interfacial tension measurements have shown that the Janus graphene nanosheets could significantly lower the IFTs between brine and crude oil at simulated reservoir conditions. With low concentration of Janus graphene nanosheets in nanofluid formula, microfluidic flooding experiments have been performed to evaluate the efficiency of the nanofluids for oil displacement in carbonate reservoirs. The results have demonstrated improved efficiency of oil recovery by the novel Janus graphene nanofluids at ultra-low concentration (0.01 wt%).
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Blacker, Richard S., K. L. Lewis, I. Sage, I. Mason et K. Webb. « Optically isotropic polymer / liquid crystal hybrid filters ». Dans Optical Interference Coatings. Washington, D.C. : Optica Publishing Group, 1997. http://dx.doi.org/10.1364/oic.1998.the.5.

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Commercially available polymer dispersed liquid crystal (PDLC) systems act as scatter mode devices in which discrete liquid crystal droplets (whose dimensions are greater than λ/10) scatter incident light when the liquid crystal units are randomly aligned, but when aligned by an applied electric field become transmissive1. The reduced scattering is due to two non-competitive effects: a reduction in refractive index to match that of the host polymer, and an alignment of the liquid crystal units. The current work has developed a system where the initial size of the discrete liquid crystal droplets is below the visible light scattering limit. This hybrid PDLC system remains optically isotropic irrespective of the applied electric field strength. This novel nanocomposite has been incorporated into etalon cavities where it is utilised as an electrooptic spacer layer, thus enabling a frequency tuneable filter to be realised.
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Hadjichristov, Georgi B., Yordan G. Marinov, Todor E. Vlakhov et Alexander G. Petrov. « Graphene-nematic liquid crystal E7 nanocomposite : The effect from nanodopants ». Dans 10th Jubilee International Conference of the Balkan Physical Union. Author(s), 2019. http://dx.doi.org/10.1063/1.5091133.

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Tkachenko, Georgiy V., Igor A. Sukhoivanov, Oleksiy V. Shulika et Volodymyr Tkachenko. « Tunable optical filter based on nanocomposite (liquid crystal)/(porous silicon) ». Dans SPIE OPTO, sous la direction de Liang-Chy Chien. SPIE, 2012. http://dx.doi.org/10.1117/12.909380.

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