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Journal articles on the topic 'Liquid crystalline phase structure'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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1

Roman, Maren, Annett Kaeding-Koppers, and Peter Zugenmaier. "Mixed-dimer formation in binary systems of 4-substituted benzoic acids and structure considerations." Canadian Journal of Chemistry 86, no. 6 (2008): 525–32. http://dx.doi.org/10.1139/v08-008.

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The phase behavior of binary systems of 4-substituted benzoic acids is governed by the formation of mixed dimers. This study was conducted to determine the effect of the components’ structural difference on mixed-dimer formation in crystalline and liquid-crystalline phases. The phase diagrams of two systems, with 4-[(S)-(–)-2-methylbutoxy]benzoic acid (MBOBA) as one component and 4-(hex-5-enoxy)benzoic acid (HOBA) and 4-(dec-9-enoxy)benzoic acid (DOBA), respectively, as the second component, were determined by differential scanning calorimetry, polarized-light microscopy, and X-ray diffraction

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2

KODAMA, Minekazu. "Phase Structure of Liquid Crystalline Copolyester/Polycarbonate Blend." KOBUNSHI RONBUNSHU 48, no. 12 (1991): 817–19. http://dx.doi.org/10.1295/koron.48.817.

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3

Tanaka, M., M. Konda, M. Miyamoto, Y. Kimura, and A. Yamaguchi. "Structure and Thermal Behaviour of a Thermotropic Liquid Crystalline Polyimide (PI-LC)." High Performance Polymers 10, no. 1 (1998): 147–53. http://dx.doi.org/10.1088/0954-0083/10/1/016.

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Anomalous solid structures formed by a thermotropic liquid crystalline polyimide (PI-LC) were investigated by thermal analysis, polarized light microscopy and x-ray analysis. It was revealed that PI-LC should undergo a phase transition from the crystalline to the isotropic phase through the smectic or nematic phase in the temperature range 277–300 °C. The PI-LC filament extruded at 280 °C, at which temperature the polymer was in liquid crystalline phase, was formed to have a structure similar to the smectic C phase, while that extruded and melt-drawn at 310 °C, at which temperature the polymer

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4

Acierno, Domenico, Simona Concilio, Pio Iannelli, and Paolo Vacca. "Molecular Structure in the Crystalline Phase of a Segmented Liquid Crystalline Polyester." Macromolecules 33, no. 26 (2000): 9688–95. http://dx.doi.org/10.1021/ma0012346.

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5

Goodby, J. W., A. Petrenko, M. Hird, R. A. Lewis, J. Meier, and J. C. Jones. "Liquid-crystalline Abrikosov flux phase with an antiferroelectric structure." Chemical Communications, no. 13 (2000): 1149–50. http://dx.doi.org/10.1039/b002941f.

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6

S., Manu, Fyna Francis, and Tobin Scaria. "Investigation on Liquid Crystalline Systems." Mapana - Journal of Sciences 5, no. 2 (2006): 57–70. http://dx.doi.org/10.12723/mjs.9.6.

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The results of experiments carried out by us on two samples exhibiting a macroscopic helical structure.While one of them shows a direct transition from chiral orientationally ordered fluid(referred to an N* phase) to a phase with one dimensional layer structure,the second sample exhibits a liquid crystal analog of the Abrikosov flux lattice of super conductors,between the N* and layered phase.The chapter compares and contrasts the differences in the behavior of the two compounds.

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7

Vallejo, Francisco Javier, José Ignacio Eguiazábal, and Jon Nazábal. "Phase Structure, Processability, and Mechanical Properties of Rodrun Liquid Crystalline 5000/Rodrun Liquid Crystalline 3000 Blends." Polymer Journal 33, no. 2 (2001): 128–32. http://dx.doi.org/10.1295/polymj.33.128.

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8

Coppola, Luigi, Domenico Gabriele, Isabella Nicotera, and Cesare Oliviero. "Rheological Properties of the Reverse Mesophases of the Pluronic L64/P-Xylene/Water System." Applied Rheology 14, no. 6 (2004): 315–23. http://dx.doi.org/10.1515/arh-2004-0018.

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Abstract The behaviour of reverse micellar solution and reverse hexagonal and lamellar liquid crystal phases in pluronic L64/water/p-xylene ternary system was investigated by rheological techniques. Samples with an increasing water content along the amphiphilic copolymer-lean side of the ternary phase diagram were analysed at different temperatures and a different behaviour was evidenced by both dynamic and steady tests for each considered phase, depending on the morphology of structure (micellar, lamellar, hexagonal phases). It was observed that the reverse micelles size increases with increa

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9

Henrissat, B., G. K. Hamer, M. G. Taylor, and R. H. Marchessault. "Characterization of some mesogenic alkyl 1-thioglycosides." Canadian Journal of Chemistry 80, no. 8 (2002): 1162–65. http://dx.doi.org/10.1139/v02-157.

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A series of dodecyl 1-thio-β-D-glycosides has been synthesized and characterized (DSC, NMR, CP MAS, X-ray diffraction) as possible new marking materials with liquid-crystalline properties. These compounds undergo solid to liquid crystal phase transitions at various temperatures, which depend on the nature of the carbohydrate part of the structure. Their liquid-crystalline phases show extreme shear thinning behaviour.Key words: liquid crystal, powder X-ray diffraction, phase transition, thioglycoside, solid-state NMR, marking material

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10

Livolant, Françoise, Stéphanie Mangenot, Amélie Leforestier, et al. "Are liquid crystalline properties of nucleosomes involved in chromosome structure and dynamics?" Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 364, no. 1847 (2006): 2615–33. http://dx.doi.org/10.1098/rsta.2006.1843.

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Nucleosome core particles correspond to the structural units of eukaryotic chromatin. They are charged colloids, 101 Å in diameter and 55 Å in length, formed by the coiling of a 146/147 bp DNA fragment (50 nm) around the histone protein octamer. Solutions of these particles can be concentrated, under osmotic pressure, up to the concentrations found in the nuclei of living cells. In the presence of monovalent cations (Na + ), nucleosomes self-assemble into crystalline or liquid crystalline phases. A lamello-columnar phase is observed at ‘low salt’ concentrations, while a two-dimensional hexagon

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11

Funahashi, Masahiro. "Chiral Liquid Crystalline Electronic Systems." Symmetry 13, no. 4 (2021): 672. http://dx.doi.org/10.3390/sym13040672.

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Liquid crystals bearing extended π-conjugated units function as organic semiconductors and liquid crystalline semiconductors have been studied for their applications in light-emitting diodes, field-effect transistors, and solar cells. However, studies on electronic functionalities in chiral liquid crystal phases have been limited so far. Electronic charge carrier transport has been confirmed in chiral nematic and chiral smectic C phases. In the chiral nematic phase, consisting of molecules bearing extended π-conjugated units, circularly polarized photoluminescence has been observed within the

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12

Koßmehl, Gerhard, and Barbara Hirsch. "Liquid Crystalline Compounds in the Thiophene Series, Part 11+ Liquid Crystalline Thiophene Carboxylic Esters." Zeitschrift für Naturforschung B 50, no. 8 (1995): 1265–74. http://dx.doi.org/10.1515/znb-1995-0822.

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The new series of ten 4,4'-bis(5-alkyl-2-thienylcarbonyloxy)azobenzenes (2a -2j) and ten 2,5-bis(5-alkyl-2-thienylcarbonyloxy)toluenes (3a -3j) were prepared. These, as yet unknown esters were characterized in relation to their structures by elemental analyses, IR, UV, 1H NMR spectra and MS. The azobenzene-esters 2a -2j which form liquid crystalline phases were studied by microscopy under polarized light and DSC (differential scanning calorimetry). Through the observation of the optical textures nematic phases were monitored. Only 2j has an additional smectic phase; 2h and 2i form monotropic s

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13

Nishikawa, Etsushi, Jun Yamamoto, Hiroshi Yokoyama, and Edward T. Samulski. "New Mesogenes Forming Nanophase Separated Liquid Crystalline Structure - Cubic Phase -." Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals 364, no. 1 (2001): 605–10. http://dx.doi.org/10.1080/10587250108025030.

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14

Fischer, Hartmut, Uwe R�tz, J�rgen Lindau, Annelore M�dicke, and Frank Kuschel. "Liquid-crystalline polyesters with y-shaped mesogens: Phase structure pecularities." Polymer Bulletin 27, no. 6 (1992): 657–63. http://dx.doi.org/10.1007/bf00297436.

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15

Girin, Oleg. "Phase Transformations in the Metallic Materials Being Electrodeposited and their Application for the Development of Advanced Technologies for Anticorrosive Protection of Canned-Food Steel Sheet." Materials Science Forum 561-565 (October 2007): 2369–72. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.2369.

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It has been found that during the electrodeposition of metallic material a supercooled metallic liquid is being formed that is solidified at the deposition temperature in the form of a crystalline or amorphous phase. These phase transformations are proved by the existence in the electrodeposited metals of metastable structures that correspond to: the amorphous structure of the solidified metallic liquid, the highly defective crystalline structure of the metal quenched from the liquid state, and the intermediate modifications that had appeared during the fast crystallization of the liquid phase

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16

Obadović, D., M. Stojanović, A. Bubnov, N. Éber, M. Cvetinov, and A. Vajda. "Structural studies on different types of ferroelectric liquid crystalline substances." Journal of Research in Physics 35, no. 1 (2011): 3–13. http://dx.doi.org/10.2478/v10242-012-0001-3.

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Structural studies on different types of ferroelectric liquid crystalline substances Structural studies of ferroelectric liquid crystalline substances of different molecular structure have been reviewed. The discussion of the results deals mainly with the structure of chiral liquid crystals forming the smectic mesophase with ferroelectric order, as the research on ferroelectric liquid crystals, due to their high potential for application in electro-optics and photonics, has recently become one of the most attractive fields. Based on data of polarizing optical microscopy and X-ray diffraction o

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17

Yevdokimov, Yuri, Sergey Skuridin, Viktor Salyanov, Sergey Semenov, and Efim Kats. "Liquid-Crystalline Dispersions of Double-Stranded DNA." Crystals 9, no. 3 (2019): 162. http://dx.doi.org/10.3390/cryst9030162.

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In this review, we compare the circular dichroism (CD) spectra of liquid-crystalline dispersion (LCD) particles formed in PEG-containing aqueous-salt solutions with the purpose of determining the packing of ds DNA molecules in these particles. Depending on the osmotic pressure of the solution, the phase exclusion of ds DNA molecules at room temperature results in the formation of LCD particles with the cholesteric or the hexagonal packing of molecules. The heating of dispersion particles with the hexagonal packing of the ds DNA molecules results in a new phase transition, accompanied by an app

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18

Yamada, Shigeyuki, Yuki Rokusha, Ryo Kawano, Kaori Fujisawa, and Osamu Tsutsumi. "Mesogenic gold complexes showing aggregation-induced enhancement of phosphorescence in both crystalline and liquid-crystalline phases." Faraday Discussions 196 (2017): 269–83. http://dx.doi.org/10.1039/c6fd00157b.

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Mesogenic Au complexes with a biphenyl core were synthesized as new AIEgens, and their thermodynamic and photophysical properties were discussed. Similar to Au complexes with a phenyl core which have been reported previously, the complexes with a short alkoxy chain formed dimers in the crystal form. However, the complexes with a long alkoxy chain formed two-dimensional layer structures through multiple intermolecular interactions in both the crystalline and liquid-crystalline (LC) phases. The present Au complexes showed a high thermochemical stability against thermal decomposition and a high t

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19

Drzewicz, Anna, Marzena Tykarska, and Magdalena Żurowska. "Influence of alkyl chain length and fluorine atoms substitution on infrared spectra of chiral liquid crystalline esters." Bulletin of the Military University of Technology 66, no. 3 (2017): 63–74. http://dx.doi.org/10.5604/01.3001.0010.5391.

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The infrared spectra were registered for series of three-ring liquid crystalline esters, differing in the structure of alkyl chain, in the substitution of benzene ring by fluorine atoms and in the type of helicoidal structure in the chiral smectic CA phase with antiferroelectric properties. The influence of molecular structure on the shift of signals coming from carbonyl group, located in the rigid core, was observed. Keywords: liquid crystals, helicoidal structure, chiral smectic CA phase, antiferroelectric crystalline phase, infrared spectroscopy

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20

Yamada, Shigeyuki, Masaya Sato, and Tsutomu Konno. "Synthesis and Characterization of Photoluminescence Liquid Crystals Based on Flexible Chain-Bearing Pentafluorinated Bistolanes." Crystals 10, no. 7 (2020): 603. http://dx.doi.org/10.3390/cryst10070603.

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The liquid-crystalline (LC) and photophysical properties of molecules are very sensitive to their electronic and molecular aggregate structures. Herein, to shed light on the structure–property relationships of pentafluorinated bistolane-based photoluminescence (PL) liquid crystals (PLLCs) previously reported by our group, we synthesized pentafluorinated bistolanes with variable flexible chains and evaluated their LC and photophysical properties. The incorporation of an oxygen atom (to afford a 2-methoxyethoxy unit) or an oxygen atom and a methyl group (to afford a 1-methoxyprop-2-oxy unit) int

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21

Budagovsky, Ivan, Aleksey Kuznetsov, Sergey Shvetsov, et al. "Phase Structure Recording in a Nematic Side-Chain Liquid-Crystalline Polymer." Polymers 12, no. 2 (2020): 356. http://dx.doi.org/10.3390/polym12020356.

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Dye-doped nematic side-chain liquid-crystalline polymers possess extraordinary large optical nonlinearity and ability to store the induced orientational deformations in a glassy state, which makes them a very promising material for photonic applications. In this study, the phase structures were generated and recorded in the bulk of a 50-μm layer of a nematic liquid-crystalline side-chain polymer, containing polyacrylate backbone, spacer having five methylene groups, and phenyl benzoate mesogenic fragment. The polymer was doped with KD-1 azodye. The director field deformations induced by the li

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22

Sadashiva, B. K. "Molecular structure and chiral liquid crystalline phases." Pramana 53, no. 1 (1999): 213–22. http://dx.doi.org/10.1007/s12043-999-0150-4.

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23

Nealon, Gareth L., Romain Greget, Cristina Dominguez, et al. "Liquid-crystalline nanoparticles: Hybrid design and mesophase structures." Beilstein Journal of Organic Chemistry 8 (March 8, 2012): 349–70. http://dx.doi.org/10.3762/bjoc.8.39.

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Liquid-crystalline nanoparticles represent an exciting class of new materials for a variety of potential applications. By combining supramolecular ordering with the fluid properties of the liquid-crystalline state, these materials offer the possibility to organise nanoparticles into addressable 2-D and 3-D arrangements exhibiting high processability and self-healing properties. Herein, we review the developments in the field of discrete thermotropic liquid-crystalline nanoparticle hybrids, with special emphasis on the relationship between the nanoparticle morphology and the nature of the organ

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24

Schaper, Andreas K., Hiroki Kurata, Taiyo Yoshioka, and Masaki Tsuji. "Composite Structure of Liquid Crystal/Polymer Nanotubes Revealed by High-Angle Annular Dark-Field Scanning Transmission Electron Microscopy." Microscopy and Microanalysis 13, no. 5 (2007): 336–41. http://dx.doi.org/10.1017/s1431927607070729.

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We have applied high-angle annular dark-field microscopy to the characterization of the structure of template-grown nanotubes composed of a polymer and a discotic liquid crystalline material. Selective staining of the liquid crystal phase with ruthenium tetroxide was used to develop adequate Z-contrast that allows us to distinguish between the two phases. At appropriate staining conditions, we could clearly visualize, in the annular dark-field mode, a 5–15-nm thin liquid crystalline layer precipitated on the inner surface of the polymer tubes. Cryo-electron diffraction has shown high alignment

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25

Degovics, G., A. Latal, E. Prenner, M. Kriechbaum, and K. Lohner. "Structure and Thermotropic Behaviour of Mixed Choline Phospholipid Model Membranes." Journal of Applied Crystallography 30, no. 5 (1997): 776–80. http://dx.doi.org/10.1107/s0021889897001386.

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Phosphatidylcholines and sphingomyelins are among the most abundant lipids in mammalian cell membranes, being major components of platelets or erythrocytes, and of the lipid monolayer of lipoproteins. General efforts have been devoted to the elucidation of the interaction of the ubiquitous membrane component cholesterol with these choline phospholipids, but fewer studies have been reported on the interaction between the phospholipids themselves. A gel to liquid-crystalline phase transition was observed for pure sphingomyelin liposomes at physiological temperature, while palmitoyloleoyl phospha

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26

Goodby, J. W., A. Petrenko, M. Hird, R. A. Lewis, J. Meier, and J. C. Jones. "ChemInform Abstract: Liquid-Crystalline Abrikosov Flux Phase with an Antiferroelectric Structure." ChemInform 31, no. 40 (2000): no. http://dx.doi.org/10.1002/chin.200040146.

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27

Huang, J. S., and R. N. Kaufmann. "Nucleation, growth, and glass formation in an electron-beam surface-processed Cu47Zr53 alloy." Journal of Materials Research 3, no. 2 (1988): 238–47. http://dx.doi.org/10.1557/jmr.1988.0238.

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A Cu47Zr53 alloy was surface processed with a directed-energy electron beam. Optical microscopy, x-ray diffraction, and transmission electron microscopy were used to identify the resolidified phases obtained under systematically varied rapid solidification conditions. The results of the investigation indicate that the underlying bulk substrate always nucleates the growth of a crystalline phase that was identified as a metastable CuZr phase with an ordered bcc (B2) structure. The maximum growth velocity of this phase was determined to be between 0.05 ± 0.02 m/s. This limit was compared under di

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28

Kipkemboi, Pius, Ali Khan, Björn Lindman, and Viveka Alfredsson. "Phase behaviour and structure of amphiphilic poly(ethylene oxide)-poly(propylene oxide) triblock copolymers ((EO)4(PO)59(EO)4 and (EO)17(PO)59(EO)17) in ternary mixtures with water and xylene." Canadian Journal of Chemistry 81, no. 8 (2003): 897–908. http://dx.doi.org/10.1139/v03-102.

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The isothermal ternary phase behaviour and structure of amphiphilic copolymerwaterxylene systems was investigated for two poly(ethylene oxide)poly(propylene oxide) (PEOPPO) triblock copolymers, (EO)4(PO)59(EO)4 and (EO)17(PO)59(EO)17, at 25°C. The phase boundaries were identified using 2H NMR and inspection under polarized light. The microstructure and structural length scales in the lyotropic liquid crystalline phases were determined and characterized by small-angle X-ray scattering. The amounts and relative proportions of the selective solvents can modulate the resulting microstructures,

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29

Chaturvedi, N., and Randall D. Kamien. "Gnomonious projections for bend-free textures: thoughts on the splay-twist phase." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 476, no. 2234 (2020): 20190824. http://dx.doi.org/10.1098/rspa.2019.0824.

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The Hopf fibration has inspired any number of geometric structures in physical systems, in particular, in chiral liquid crystalline materials. Because the Hopf fibration lives on the three sphere, S 3 , some method of projection or distortion must be employed to realize textures in flat space. Here, we explore the geodesic-preserving gnomonic projection of the Hopf fibration, and show that this could be the basis for a new liquid crystalline texture with only splay and twist. We outline the structure and show that it is defined by the tangent vectors along the straight line rulings on a series

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30

Drzewicz, Anna, Marzena Tykarska, Mateusz Szala, and Magdalena Żurowska. "Influence of molecular structure on helicoidal structure and NMR spectra of chiral liquid crystalline esters." Bulletin of the Military University of Technology 66, no. 2 (2017): 25–35. http://dx.doi.org/10.5604/01.3001.0010.1887.

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Three-ring chiral liquid crystalline compounds, forming antiferroelectric phase, differing in the structure of alkyl chain and in the substitution of benzene ring by fluorine atoms were studied. The measurements of helical pitch, based on the selective light reflection phenomenon, were performed as well as 1H and 13C NMR spectra at room temperature were registered. The influence of molecular structure as well as the type of helicoidal structure on the chemical shift of signals coming from chiral center was observed. Keywords: liquid crystals, helicoidal structure, nuclear magnetic resonance, a

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31

Caputo, Roberto, Antonio De Luca, Giuseppe Strangi, et al. "The POLICRYPS liquid-crystalline structure for optical applications." Advanced Optical Technologies 7, no. 5 (2018): 273–89. http://dx.doi.org/10.1515/aot-2018-0027.

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Abstract We present a review of polymer-liquid crystal-based devices for optical applications. Starting from a particular fabrication technique, which enables to obtain the POLICRYPS (POlymer LIquid CRYstal Polymer Slices) structure, we illustrate different realizations, along with their working principle and main features and performances. The name POLICRYPS indicates a structure made of parallel slices of pure polymeric material alternated to films of well-aligned nematic liquid crystal (NLC), with a spatial periodicity that can be settled in the range 0.2÷15 μm. Suitably designed samples ca

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Shimobayashi, Shunsuke F., and Yuki Ohsaki. "Universal phase behaviors of intracellular lipid droplets." Proceedings of the National Academy of Sciences 116, no. 51 (2019): 25440–45. http://dx.doi.org/10.1073/pnas.1916248116.

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Lipid droplets are cytoplasmic microscale organelles involved in energy homeostasis and handling of cellular lipids and proteins. The core structure is mainly composed of two kinds of neutral lipids, triglycerides and cholesteryl esters, which are coated by a phospholipid monolayer and proteins. Despite the liquid crystalline nature of cholesteryl esters, the connection between the lipid composition and physical states is poorly understood. Here, we present a universal intracellular phase diagram of lipid droplets, semiquantitatively consistent with the in vitro phase diagram, and reveal that

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33

MORRIS, JAMES R., RACHEL S. AGA, TAKESHI EGAMI, and VALENTIN A. LEVASHOV. "SIMULATING THE EFFECT OF POISSON RATIO ON METALLIC GLASS PROPERTIES." International Journal of Modern Physics B 23, no. 06n07 (2009): 1229–34. http://dx.doi.org/10.1142/s0217979209060737.

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Recent work has shown that many metallic glass properties correlate with the Poisson ratio of the glass. We have developed a new model for simulating the atomistic behavior of liquids and glasses that allows us to change the Poisson ratio, while keeping the crystalline phase cohesive energy, lattice constant, and bulk modulus fixed. A number of liquid and glass properties are shown to be directly affected by the Poisson ratio. An increasing Poisson ratio stabilizes the liquid structure relative to the crystal phase, as indicated by a significantly lower melting temperature and by a lower entha

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Blinc, R., A. Gregorovič, and B. Zalar. "Deuteron NMR Lineshapes in the Antiferroelectric Liquid Crystalline Phase of MHPOBC." Zeitschrift für Naturforschung A 55, no. 1-2 (2000): 298–300. http://dx.doi.org/10.1515/zna-2000-1-252.

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The deuteron NMR lineshapes in the tilted antiferroeelectric smectic liquid crystalline phases are evaluated for: i) the case of a discrete short pitch modulation P1 = N • d where N = 2,3,4, ii) for a superposition of two modulations p1 and p0 where p0 ≫p1 as well as iii) for the case where in addition rapid molecular exchange between adjacent layers takes place due to translational diffusion. The results are compared with the experimental deuteron NMR spectra of α-CD2 deuterated MHPOBC in the Sm C*A phase measured at different angles between the magnetic field direction and the normals to the

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35

Eckert, Andreas, Bernd Kohne, and Klaus Praefcke. "Flüssigkristalline Kohlenhydratdithioacetale / Liquid Crystalline Carbohydrate Dithioacetals." Zeitschrift für Naturforschung B 43, no. 7 (1988): 878–88. http://dx.doi.org/10.1515/znb-1988-0714.

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Abstract S,S-dialkyl acetals of hexanal and numerous aldoses, tripodal in structure, have been synthesized, characterized and investigated by optical microscopy and D.S.C. Most of these geminal dithioacetals show a complicated melting behaviour and are thermotropic liquid crystal-line, exhibiting only one smectic-like phase of identical type. This mesophase is not miscible with the SAd -Phase of other amphiphilic sugar-based liquid crystals. As shown in a homologues series of D-glucose S,S-dialkylacetal derivatives clearing points are rising as function of growing number n of carbon atoms in t

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36

Uhl, Benedikt, Florian Buchner, Dorothea Alwast, Nadja Wagner, and R. Jürgen Behm. "Adsorption of the ionic liquid [BMP][TFSA] on Au(111) and Ag(111): substrate effects on the structure formation investigated by STM." Beilstein Journal of Nanotechnology 4 (December 16, 2013): 903–18. http://dx.doi.org/10.3762/bjnano.4.102.

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In order to resolve substrate effects on the adlayer structure and structure formation and on the substrate–adsorbate and adsorbate–adsorbate interactions, we investigated the adsorption of thin films of the ionic liquid (IL) 1-butyl-1-methylpyrrolidinium-bis(trifluoromethylsulfonyl)imide [BMP][TFSA] on the close-packed Ag(111) and Au(111) surfaces by scanning tunneling microscopy, under ultra high vacuum (UHV) conditions in the temperature range between about 100 K and 293 K. At room temperature, highly mobile 2D liquid adsorbate phases were observed on both surfaces. At low temperatures, aro

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37

Pocock, Emily E., Richard J. Mandle, and John W. Goodby. "Experimental and Computational Study of a Liquid Crystalline Dimesogen Exhibiting Nematic, Twist-Bend Nematic, Intercalated Smectic, and Soft Crystalline Mesophases." Molecules 26, no. 3 (2021): 532. http://dx.doi.org/10.3390/molecules26030532.

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Liquid crystalline dimers and dimesogens have attracted significant attention due to their tendency to exhibit twist-bend modulated nematic (NTB) phases. While the features that give rise to NTB phase formation are now somewhat understood, a comparable structure–property relationship governing the formation of layered (smectic) phases from the NTB phase is absent. In this present work, we find that by selecting mesogenic units with differing polarities and aspect ratios and selecting an appropriately bent central spacer we obtain a material that exhibits both NTB and intercalated smectic phase

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38

Wang, Xiaotao, Zhuofan Chen, Yiwan Huang, et al. "Liquid crystallinity and thermal properties of polyhedral oligomeric silsesquioxane/side-chain azobenzene hybrid copolymer." Nanotechnology Reviews 9, no. 1 (2020): 886–95. http://dx.doi.org/10.1515/ntrev-2020-0068.

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AbstractAcrylic acid-modified polyhedral oligomeric silsesquioxane (AC-POSS) was synthesized by the reaction between the amine groups in polyhedral oligomeric silsesquioxane (POSS) and acrylic acid, which could dissolve in water and can be easily purified. Free-radical copolymerization was applied to synthesize azobenzene liquid crystalline polymer silsesquioxane (LCP-POSS) with different proportions of AC-POSS and liquid crystalline monomers. The trans-isomers of azobenzene moieties in LCP-POSS were gradually transformed to cis-isomers with increasing ultraviolet irradiation time. The photois

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Tam-Chang, Suk Wah, Delfin Mahinay, and Li Ming Huang. "Multifunctional Materials via Molecular Self-Organization into Liquid-Crystalline Phase." Advanced Materials Research 47-50 (June 2008): 165–68. http://dx.doi.org/10.4028/www.scientific.net/amr.47-50.165.

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In this paper, we described the synthesis of N,N’-di-(2-ammoniumethyl)perylene- 3,4,9,10-bis(dicarboximide) ditrifluoroacetate (1), an ionic organic compound that self-organized to give chromonic liquid crystals and anisotropic crystals. Using a polymer template with micrometer-scale features to direct the ordered arrangement of 1, patterned structure with micrometer-scale local order was fabricated. The anisotropic (direction-dependent) properties of the crystals and micropatterns of 1 were investigated.

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Suponitskii, K. Yu, T. V. Timofeeva, K. A. Lyssenko, and N. N. Makarova. "Molecular conformation and supramolecular structure of carbosilane, precursor of liquid crystalline phase." Acta Crystallographica Section A Foundations of Crystallography 52, a1 (1996): C276. http://dx.doi.org/10.1107/s0108767396088460.

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Yu, Zhen-Qiang, Jacky W. Y. Lam, Keqing Zhao, et al. "Mesogen jacketed liquid crystalline polyacetylene containing triphenylene discogen: synthesis and phase structure." Polym. Chem. 4, no. 4 (2013): 996–1005. http://dx.doi.org/10.1039/c2py20535a.

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Kimura, Hiroshi, Koichiro Aikawa, Yuichi Masubuchi, Jun-ichi Takimoto, K. Koyama, and Keiji Minagawa. "Phase structure change and ER effect in liquid crystalline polymer/dimethylsiloxane blends." Rheologica Acta 37, no. 1 (1998): 54–60. http://dx.doi.org/10.1007/s003970050090.

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Zalden, Peter, Florian Quirin, Mathias Schumacher, et al. "Femtosecond x-ray diffraction reveals a liquid–liquid phase transition in phase-change materials." Science 364, no. 6445 (2019): 1062–67. http://dx.doi.org/10.1126/science.aaw1773.

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In phase-change memory devices, a material is cycled between glassy and crystalline states. The highly temperature-dependent kinetics of its crystallization process enables application in memory technology, but the transition has not been resolved on an atomic scale. Using femtosecond x-ray diffraction and ab initio computer simulations, we determined the time-dependent pair-correlation function of phase-change materials throughout the melt-quenching and crystallization process. We found a liquid–liquid phase transition in the phase-change materials Ag4In3Sb67Te26 and Ge15Sb85 at 660 and 610 k

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Hu, Jian She, Yi Nan Liu, Ya Ting Song, and Di Wang. "Synthesis and Liquid Crystalline Properties of New Chiral Monomers and Polysiloxanes." Advanced Materials Research 815 (October 2013): 747–51. http://dx.doi.org/10.4028/www.scientific.net/amr.815.747.

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To study the structure-property relationships of new chiral liquid crystalline materials based on menthol and explore their potential applications, a monomer 4-(4-allyloxybenzoyloxy) phenyl-4-menthyl-oxyacetyloxybiphenyl-4-carboxylate (LCM) and the corresponding homopolymer (LCP) were synthesized. The chemical structure was characterized by FT-IR and 1H NMR. The liquid crystalline properties were investigated by differential scanning calorimetry, thermogravimetric analysis, polarizing optical microscopy, and X-ray diffraction. The monomer LCM formed a cholesteric phase when a flexible linkage

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ALDRIDGE, B., G. DE LUCA, M. EDGAR, et al. "The structure of 2,2'-difluorobiphenyl in solid crystalline and liquid crystalline phases." Liquid Crystals 24, no. 4 (1998): 569–81. http://dx.doi.org/10.1080/026782998207046.

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Das, Susanta K., and Alejandro D. Rey. "Kinetic structures in multi-phase liquid-crystalline composite materials." Molecular Simulation 31, no. 2-3 (2005): 201–6. http://dx.doi.org/10.1080/08927020412331332613.

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Aguilera, Carlos. "Notizen: Frozen Cholesteric Phase of a β-Estradiol Derivative". Zeitschrift für Naturforschung B 42, № 1 (1987): 113–14. http://dx.doi.org/10.1515/znb-1987-0122.

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Abstract A new β-estradiol derivative was synthesized. The compound shows LC behaviour (cholesteric phase between 119 and 151 °C). On cooling the LC state, the liquid crystalline structure is preserved. The mesophase persists at room temperature. To our knowledge, such a thermotropic behaviour has only been observed in the case of polymeric liquid crystals.

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Dhadwal, Avantika, Dev Raj Sharma, Vinay Pandit, Mahendra Singh Ashawat, and Pravin Kumar. "Cubosomes: A Novel Carrier for Transdermal Drug Delivery." Journal of Drug Delivery and Therapeutics 10, no. 1 (2020): 123–30. http://dx.doi.org/10.22270/jddt.v10i1.3814.

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Cubosomes are square and rounded particles with internal cubic lattice. Cubosomes are thermodynamically stable and consist of honeycombed (cavernous) structures separating two internal aqueous channels and a large interfacial area. Cubosomes are nanoparticles which are self assembled liquid crystalline particles of certain surfactants with proper ratio of water with microstructure that provides unique properties of practical interest. Bicontinuous cubic liquid crystalline phase is optically clear and very viscous material has the unique structure at nanometer scale. The word bicontinuous refer

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Funahashi, Masahiro. "Electronic Functions in Liquid-Crystalline Nanostructures with High Polarization." MRS Advances 4, no. 31-32 (2019): 1733–40. http://dx.doi.org/10.1557/adv.2019.247.

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AbstractMultifunctionality was created by coupling an electronic charge carrier transport with ionic conductivity or ferroelectricity in polarized liquid crystal phases. Liquid-crystalline perylene bisimide derivatives bearing cyclotetrasiloxane rings and triethylene oxide chains formed nanosegregated columnar structures which could conduct ions as well as electrons. The spin-coated thin films could be insolubilized by the exposure on acid vapors and display electrochromism. Phenylterthiophene derivatives bearing a chiral alkyl side chain exhibited a ferroelectric phase, in which a photovoltai

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Milak, Spomenka, Angela Chemelli, Otto Glatter, and Andreas Zimmer. "Vancomycin Loaded Glycerol Monooleate Liquid Crystalline Phases Modified with Surfactants." Pharmaceutics 12, no. 6 (2020): 521. http://dx.doi.org/10.3390/pharmaceutics12060521.

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The influence of two tuning agents, polyglycerol ester (PE) and triblock copolymer (TC), on the properties of glycerol monooleate (MO) liquid crystalline phase (LCP) was investigated to achieve the therapeutic concentration of vancomycin hydrochloride (VHCl) into the eye, topically during 60 min (1 h) and intravitreally during 2880 min (48 h). Different techniques were used to elucidate the impact of surfactants on the structure of the LCP: polarized light microscopy (PLM), small-angle X-ray scattering (SAXS), and in vitro release tests I and II (simulating local and intravitreal application i

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