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Готові списки джерел за темами / Bent Core Mesogens

Добірка наукової літератури з теми "Bent Core Mesogens"

Автор: Grafiati

Опубліковано: 18 травня 2024

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Статті в журналах з теми "Bent Core Mesogens"

1

Revignas, Davide, and Alberta Ferrarini. "From Bend to Splay Dominated Elasticity in Nematics." Crystals 11, no. 7 (July 17, 2021): 831. http://dx.doi.org/10.3390/cryst11070831.

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In the past decade, much evidence has been provided for an unusually low cost for bend deformations in the nematic phase of bent-core mesogens and bimesogens (liquid crystal dimers) having a bent shape on average. Recently, an analogous effect was observed for the splay mode of bent-core mesogens with an acute apical angle. Here, we present a systematic computational investigation of the Frank elastic constants of nematics made of V-shaped particles, with bend angles ranging from acute to obtuse. We show that by tuning this angle, the elastic behavior switches from bend dominated (K33>K11) to splay dominated (K11>K33), with anomalously low values of the splay and the bend constant, respectively. This is related to a change in the shape polarity of particles, which is associated with the emergence of polar order, longitudinal for splay and transversal for bend deformations. Crucial to this study is the use of a recently developed microscopic elastic theory, able to account for the interplay of mesogen morphology and director deformations.

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2

Achten, Remko, Evelien A. W. Smits, R. Amaranatha Reddy, Marcel Giesbers, Antonius T. M. Marcelis, and Ernst J. R. Sudhölter. "Monofluorinated unsymmetrical bent‐core mesogens." Liquid Crystals 33, no. 1 (January 2006): 57–65. http://dx.doi.org/10.1080/02678290500393131.

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3

Geese, Karina, Marko Prehm, and Carsten Tschierske. "Bent-core mesogens with thiophene units." Journal of Materials Chemistry 20, no. 43 (2010): 9658. http://dx.doi.org/10.1039/c0jm01919d.

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4

Weissflog, Wolfgang, and Ute Baumeister. "Laterally aryl-substituted bent-core mesogens." Liquid Crystals 40, no. 7 (July 2013): 959–67. http://dx.doi.org/10.1080/02678292.2013.786797.

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5

Keith, Christina, Anne Lehmann, Ute Baumeister, Marko Prehm, and Carsten Tschierske. "Nematic phases of bent-core mesogens." Soft Matter 6, no. 8 (2010): 1704. http://dx.doi.org/10.1039/b923262a.

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6

VITA, FRANCESCO, IMMACOLATA F. PLACENTINO, and ORIANO FRANCESCANGELI. "RECENT DEVELOPMENTS IN NEMATOGENIC BENT-CORE MESOGENS: AN X-RAY DIFFRACTION PERSPECTIVE." Journal of Nonlinear Optical Physics & Materials 20, no. 04 (December 2011): 485–99. http://dx.doi.org/10.1142/s0218863511006285.

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Bent-core mesogens are attracting great attention because of their potentially biaxial and polar nematic phase. In this paper, we review the results of our recent X-ray diffraction studies on the nematic phase of oxadiazole-based mesogens. The evolution of the small-angle diffraction signal with temperature points to the existence of nano-sized cybotactic clusters, characterized by short-range smectic-like fluctuations. However, in contrast to classical cybotaxis of calamitic nematics, these fluctuations do not have a pretransitional nature. They explain most of the extraordinary properties of bent-core mesogens and, in particular, are responsible for the unique ferroelectric response exhibited by one of our compounds.

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7

Nguyen, Khanh Thuy, Anna Battisti, Daniele Ancora, Francesco Sciortino, and Cristiano De Michele. "Self-assembly of mesogenic bent-core DNA nanoduplexes." Soft Matter 11, no. 15 (2015): 2934–44. http://dx.doi.org/10.1039/c4sm01571a.

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8

Findeisen-Tandel, S., M. W. Schröder, G. Pelzl, U. Baumeister, W. Weissflog, S. Stern, A. Nemes, R. Stannarius, and A. Eremin. "Multistage polar switching in bent-core mesogens." European Physical Journal E 25, no. 4 (April 2008): 395–402. http://dx.doi.org/10.1140/epje/i2007-10306-1.

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9

Findeisen-Tandel, Sonja, Ute Baumeister, Maria-Gabriela Tamba, and Wolfgang Weissflog. "Bent-core Mesogens Containing Amide Linking Groups." Ferroelectrics 468, no. 1 (July 30, 2014): 28–51. http://dx.doi.org/10.1080/00150193.2014.933611.

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10

Ciastek, Sylwia, Marcin Jasiński, and Piotr Kaszyński. "3-Substituted 6-oxoverdazyl bent-core nematic radicals: synthesis and characterization." RSC Advances 5, no. 42 (2015): 33328–33. http://dx.doi.org/10.1039/c5ra04119h.

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Дисертації з теми "Bent Core Mesogens"

1

Nádasi, Hajnalka. "Bent-core mesogens - substituent effect and phase behavior." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=973405104.

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2

Hong, Seung Ho. "Short-range Structure of Nematic Bent-core Mesogens." Kent State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=kent1271255435.

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3

Joshi, Leela Pradhan. "X-RAY STUDY OF MESOMORPHISM OF BENT-CORE AND CHROMONIC MESOGENS." Kent State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=kent1239979869.

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4

Hahn, Harald. "Synthese und Charakterisierung SiH-funktionalisierter Carbosilane als Bausteine in Bent-Core Mesogenen." Doctoral thesis, Universitätsbibliothek Chemnitz, 2006. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200600896.

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In der vorliegenden Arbeit wird die Synthese und die Charakterisierung von linearen, sternförmig und dendritisch verzweigten Carbosilanen mit Me2SiH-Funktionen, vorgestellt. So konnten oligomere Carbosilane mit CH2CH2CH2SiMe2- als auch CH2CH2SiMe2-Wiederholungseinheiten dargestellt werden. Als Aufbaureaktionen dienten sowohl Alkylierungsreaktionen mit Allylmagnesiumchlorid als auch Hydrosilylierungsschritte mit Chlordimethyl- und Chlordimethylvinylsilan. Die Überführung der SiMe2Cl-Gruppen in SiMe2H-Funktionen gelang durch die Umsetzung mit Lithiumaluminiumhydrid. Besonderes Augenmerk lag auf dem Nachweis und der Abtrennung der bei diesen Reaktionen auftretenden Nebenprodukten. Einen Schwerpunkt dieser Arbeit bildete die NMR-spektroskopische Charakterisierung obiger Verbindungen, wobei insbesondere 2D-NMR-Methoden und die 29Si{1H}-NMR-Spektros-kopie zum Einsatz kamen. Für die Kohlenstoff-13-Signale dieser Verbindungen konnte aus den gewonnenen Daten der Einfluss der peripheren Substituenten in einem Inkrementensystem zusammengefasst und als Zuordnungshilfe herangezogen werden. Bisher fand ein Teil dieser Verbindungen als Bausteine in flüssigkristallinen Materialien (Arbeitskreis von Prof. Tschierske, Halle) Verwendung und erste Ergebnisse dazu werden diskutiert.

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5

Davis, David Richard. "Synthesis and Mesogenic Properties of Liquid Crystals with Bent Core-Tail Substitution Geometry." Kent State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=kent1374770168.

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6

Geese, Karina [Verfasser], C. [Akademischer Betreuer] Tschierske, and G. [Akademischer Betreuer] Mehl. "Synthese lateral substituierter bent-core Mesogene / Karina Geese. Betreuer: C. Tschierske ; G. Mehl." Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2012. http://d-nb.info/103772545X/34.

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7

Lehmann, Anne [Verfasser], C. [Akademischer Betreuer] Tschierske, and G. [Akademischer Betreuer] Mehl. "Strukturvariationen an bent-core Mesogenen auf 4-Cyanresorcinolbasis / Anne Lehmann. Betreuer: C. Tschierske ; G. Mehl." Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2014. http://d-nb.info/1065670133/34.

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8

Tamba, Maria Gabriela [Verfasser], W. [Akademischer Betreuer] Weißflog, and R. [Akademischer Betreuer] Zentel. "Design of liquid crystal dimers and trimers : synthesis and characterization of novel systems containing bent-core and calamitic mesogenic units / Maria Gabriela Tamba. Betreuer: W. Weißflog ; R. Zentel." Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2014. http://d-nb.info/1069814741/34.

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9

Yu, Fang Cheng, and 俞方正. "Synthesis and Property Investigation of Bent Core Mesogens." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/19597965777669652804.

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博士
淡江大學
化學學系博士班
96
Depending upon the shape of molecule and the polarizability of constituting moiety, a number of peculiar mesophases can be formed with molecules consisting of various bent cores. Three types of bent shape mesogens are synthesized: hockey stick molecule, banana molecule and bent core molecule. The properties of these mesophases are studied with optical polarizing microscopy, differential scanning calorimetry, X-ray diffraction, and electric field effect. Type 1: Hockey stick molecules—bent molecules have two wings differing greatly in length. Enantiotropic anticlinic smectic C (SmCa), smectic C (SmC), smectic A (SmA) and nematic (N) phases of hockey stick molecules are obtained by tuning the length of hydrocarbon chain located at the meta-position to the carbon-carbon double bond of stilbenyl moiety of calamitic mesogenic skeletons. The thermodynamic properties and some aspects of optical appearance of these phases are indiscernible from those of calamitic mesogens. Distinctions are noted such as appearance of 2-brush defects and two types of domains in the tilted smectic phases. X-ray results indicate existence of clusters in the nematic phase and simple layer structure in the smectic phases. These phases exhibit electric field driven color switching, and all the results imply that all three molecular axes are simultaneously aligned in the N and SmC phases—a behavior unprecedented and different from those of conventional calamitic mesogens. Doping with a chiral calamitic mesogen results in formation of corresponding chiral N and ferroelectric SmC phases, but effect for the SmCa phase is not clear. Small and comparable values of spontaneous polarization are obtained for the doped and non-doped phases. Molecular organization of SmC and SmCa phases are proposed and discussed. Type 2: Banana molecules—bent molecules with two wings equivalent or nearly so. Ani series employed 2,4-disubstituted anisole as the bending unit (BU) and consisted of five phenyl rings linked with ester functional groups. The bulky methoxy group at the bending unit weakens intermolecular force and affects the molecular packing so the higher ordered mesophases disappear and thermal stability of mesophase decreases. For the system with distyrylbenzene as the BU, two systems were synthesized—five and seven rings, (XST)2-B and (XBST)2-B, rspectively. Substitutents NH2 and/or F were also attached to the BU. B2 phases were observed for all the (XST)2-B derivatives but B1 for NH2-(ClST)2-B. The B2 phases are identified to be SmCAPA subphase according to the electrooptic study and the values of spontaneous polarization varies with the electron donating and withdrawing property of the substituents. Comparing to (XST)2-B, molecules (XBST)2-B have two more phenyl rings, one at each wing, and therefore higher polarizability, so the higher ordered phase B1 is observed. The lateral chloro substituent at the terminal phenyl ring of the wings increases the steric effect and lowers the packing order, the B1 phase is converted back to B2. Compounds (XST)2-B are fluorescent for distyrylbenzene being a chromophore. The emission wavelength is blue shifted (388nm) and red shifted (473nm) when F and NH2, respectively, is attached at the BU. This behavior is attributed to the resonance stuctures formed when the electron donating and withdrawing groups are covalent bonded to the distyrylbenzene core. Type 3: Bent core molecules—both wings consist of phenyl rings but are highly un- symmetrical. 1,6-N series consists of naphthalene as the BU and with substitutents located at 1 and 6 positions. Banana phases would appear preferrably with equivalent substituents. For the series R’-ST and R’-BST, 3,4’-disubstituted stilbene is the BU. Increasing the polarizability from aliphatic chain to aromatic ring system for the substituents located at the 3-position would convert the hockey stick mesophase to banana phase. This study shows that bent molecule is capable to form mesophases provided that bent conformation, a mesophase destroying factor, and polarizability of moieties, a mesophase constructing factor, are properly balanced.

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10

Nádasi, Hajnalka [Verfasser]. "Bent-core mesogens - substituent effect and phase behavior / von Hajnalka Nádasi." 2004. http://d-nb.info/973405104/34.

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Частини книг з теми "Bent Core Mesogens"

1

Vaupotič, N., D. Pociecha, and E. Gorecka. "Polar and Apolar Columnar Phases Made of Bent-Core Mesogens." In Topics in Current Chemistry, 281–302. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/128_2011_231.

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2

Acharya, Bharat R., and Satyendra Kumar. "Fact or Fiction: Cybotactic Groups in the Nematic Phase of Bent Core Mesogens." In Liquid Crystals Beyond Displays, 427–48. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118259993.ch13.

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3

Marini, Alberto, Veena Prasad, and Ronald Y. Dong. "A Combined DFT and Carbon-13 NMR Study of a Biaxial Bent-core Mesogen." In Nuclear Magnetic Resonance Spectroscopy of Liquid Crystals, 413–49. WORLD SCIENTIFIC, 2009. http://dx.doi.org/10.1142/9789814273671_0013.

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Тези доповідей конференцій з теми "Bent Core Mesogens"

1

Choi, E.-Joon, Ji-Hoon Lee, and Wang-Cheol Zin. "Polar and biaxial properties of mesophases derived from bent-core mesogens with an acute-subtended angle." In SPIE OPTO, edited by Liang-Chy Chien and Hiroshi Yokoyama. SPIE, 2011. http://dx.doi.org/10.1117/12.884795.

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