Relevant bibliographies by topics / Mesomorphic phase

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Academic literature on the topic 'Mesomorphic phase'

Author: Grafiati
Published: 18 May 2024

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Journal articles on the topic "Mesomorphic phase"

1

Ha, Sie-Tiong, and Teck-Leong Lee. "Synthesis and Mesomorphic Properties of New Fluorinated Schiff Base Liquid Crystals." ISRN Materials Science 2014 (January 16, 2014): 1–7. http://dx.doi.org/10.1155/2014/904657.

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Two new compounds, 4-alkanoyloxybenzylidene-4′-fluoroaniline and 4-fluorobenzylidene-4′-n-alkanoyloxyaniline comprising a terminal fluorosubstituent were studied. The fluoro substituent contributes to the molecular polarizability, thus affecting intermolecular interactions and hence resulting in smectic mesomorphism. The mesomorphic properties were studied using differential scanning calorimetry and polarizing optical microscopy techniques. The mesomorphic properties of compounds studied are strongly dependent on the orientation of the imine (CH=N) linkage. The former Schiff base exhibited smectic A phase whereas the latter compound did not display any mesophase. Reversed imine linkage has caused depression of mesomorphic property in the compound studied (4-fluorobenzylidene-4′-n-alkanoyloxyaniline). The mesomorphic properties of the present compounds were compared with other structurally related series to establish the chemical structure-mesomorphic property relationship.
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2

Mirnaya, T. A., G. G. Yaremchuk, and S. V. Volkov. "Phase Diagrams of Binary Systems of Some Alkali Propionates." Zeitschrift für Naturforschung A 48, no. 10 (1993): 995–99. http://dx.doi.org/10.1515/zna-1993-1006.

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Abstract The phase diagrams of the binary systems sodium-potassium, sodium-caesium, and potassium-caesium propionates have been investigated by differential thermal analysis and hot-stage polarization microscopy. Smectic liquid crystals in the systems with sodium propionate have been discovered. Liquid crystal formation in binaries of two non-mesomorphic components is explained by latent mesomorphism which is shown to be inherent to both sodium and potassium propionate.
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3

Sharma, Vinay S., and R. B. Patel. "Synthesis of Liquid Crystals with Substituents in Terminal Benzene Cores and their Mesomorphic Behaviour." International Letters of Chemistry, Physics and Astronomy 58 (September 2015): 144–53. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.58.144.

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A new homologous series consisting of thirteen homologues central ester and chalcone linkage with Pentyloxy side chain at terminal benzene ring is synthesized and their mesomorphic properties are studied, with the exception of the methyl, ethyl and propyl homologues. However, the rest of homologues show mesomorphism enantiotropically manner with exhibition of nematic phase. The texture image of the nematic mesophases is observed by optical polarizing microscope equipped with heating stage (POM) is threaded or Schlieren type. An odd-even effect is observed in the nematic-isotropic curve with alternation in transition temperatures. The mesomorphic properties of the novel series are compared with other structurally similar homologous series. Analytical and spectral data confirm the molecular structure of the compounds.
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4

Sharma, Vinay S., and R. B. Patel. "Synthesis of Liquid Crystals with Substituents in Terminal Benzene Cores and their Mesomorphic Behaviour." International Letters of Chemistry, Physics and Astronomy 58 (September 2, 2015): 144–53. http://dx.doi.org/10.56431/p-9j6csf.

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A new homologous series consisting of thirteen homologues central ester and chalcone linkage with Pentyloxy side chain at terminal benzene ring is synthesized and their mesomorphic properties are studied, with the exception of the methyl, ethyl and propyl homologues. However, the rest of homologues show mesomorphism enantiotropically manner with exhibition of nematic phase. The texture image of the nematic mesophases is observed by optical polarizing microscope equipped with heating stage (POM) is threaded or Schlieren type. An odd-even effect is observed in the nematic-isotropic curve with alternation in transition temperatures. The mesomorphic properties of the novel series are compared with other structurally similar homologous series. Analytical and spectral data confirm the molecular structure of the compounds.
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5

Bhola, G. N., and Umed C. Bhoya. "Mesomorphism Dependence on Cis-Trans Configuration and Varying Terminal/Lateral Group." International Letters of Chemistry, Physics and Astronomy 65 (April 2016): 71–79. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.65.71.

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A chalconyl trans vinyl ester homologous series of thermotropic liquid crystals RO-C6H4-CH=CH-COO-C6H4-CH=CH-CO-C6H3(OCH3)2meta-para is synthesized and studied with a view to understand and establish the relation between molecular structure and mesomorphism or mesomorphic behaviors. Novel homologous series consists of thirteen homologues (C1to C18). First five (C1to C5) homologues are nonmesogenic. Rest of the homologues (C6to C18) homologues is mesogenic. Monotropically smectogenic character appears from C6to C10homologue and C12to C18homologues are enantiotropically smectogenic. Nematogenic property is totally absent throughout a series. Textures of smectic phase are of the type smectic A or C. Transition curves of a phase diagram behaved in normal manner. Analytical, spectral and thermal data supports the molecular structures of homologues. Odd-even effect is observed for Sm-I/I-Sm transition curve. Thermal stability for smectic is 93.7 °C and the mesomorphic phase lengths from enantiotropic homologues for smectic from minimum to maximum is 6.0 °C to 28.0 °C at the C12and C18homologue respectively. Series is smectogenic without exhibition of nematic property. The group efficiency order on the basis of thermal stability is derived; from comparative study of present series and analogous series.
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6

KONISHI, TAKASHI, and YOSHIHISA MIYAMOTO. "Polymer Crystallization through Mesomorphic Phase." Sen'i Gakkaishi 75, no. 2 (2019): P—103—P—107. http://dx.doi.org/10.2115/fiber.75.p-103.

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7

NISHIDA, KOJI, TAKASHI KONISHI, and TOSHIJI KANAYA. "Mesomorphic Phase in Crystalline Polymer." FIBER 63, no. 12 (2007): P.412—P.416. http://dx.doi.org/10.2115/fiber.63.p_412.

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8

MORIYA, Keiichi, Yasuyuki KAWANISHI, Toshiya SUZUKI, Shinichi YANO, and Meisetsu KAJIWARA. "Mesomorphic Phase Transition in Organophosphazenes." KOBUNSHI RONBUNSHU 56, no. 6 (1999): 390–95. http://dx.doi.org/10.1295/koron.56.390.

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9

Maheta, S. A., G. N. Bhola, and Umed C. Bhoya. "Dependence of Liquid Crystalline Behaviors on Molecular Flexibility." International Letters of Chemistry, Physics and Astronomy 47 (February 2015): 77–86. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.47.77.

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A novel homologous series of thermotropic liquid crystal (LC) has been synthesized with a view to understand and establish the effect of molecular structure on liquid crystal behaviors of a series. The present LC series consist of twelve homologues (C1 to C16); whose mesomorphic properties commence from octyloxy (C8) homologue of a series. C8, C10 and C12 members of a series are monotropic smectic and C14, C16 members are enantiotropically smectogenic. C1 to C7 homologues are nonmesomorphic. Nematogenic property is totally absent. Transition and melting temperatures are determined by an optical polarizing microscopy equipped with a heating stage. Textures of smectic mesophases are focal conic three or two dimensional networking of the type A or C. Cr-I/Sm and Sm-I or I-Sm transition curves behaved in normal manner. Analytical and spectral data confirms the molecular structures of homologues. Thermal stability of smectogenic mesophase is 100.6 oC and mesomorphic phase length is very short (12.9 °C to 15.3 oC). LC properties of a present novel series are compared with the structurally similar homologous series. Present series is partly smectogenic and partly non mesomorphic with poor degree of mesomorphism and middle ordered melting type without exhibition of nematogenic behavior.
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10

Maheta, S. A., G. N. Bhola, and Umed C. Bhoya. "Dependence of Liquid Crystalline Behaviors on Molecular Flexibility." International Letters of Chemistry, Physics and Astronomy 47 (February 24, 2015): 77–86. http://dx.doi.org/10.56431/p-88a000.

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Abstract:
A novel homologous series of thermotropic liquid crystal (LC) has been synthesized with a view to understand and establish the effect of molecular structure on liquid crystal behaviors of a series. The present LC series consist of twelve homologues (C1 to C16); whose mesomorphic properties commence from octyloxy (C8) homologue of a series. C8, C10 and C12 members of a series are monotropic smectic and C14, C16 members are enantiotropically smectogenic. C1 to C7 homologues are nonmesomorphic. Nematogenic property is totally absent. Transition and melting temperatures are determined by an optical polarizing microscopy equipped with a heating stage. Textures of smectic mesophases are focal conic three or two dimensional networking of the type A or C. Cr-I/Sm and Sm-I or I-Sm transition curves behaved in normal manner. Analytical and spectral data confirms the molecular structures of homologues. Thermal stability of smectogenic mesophase is 100.6 oC and mesomorphic phase length is very short (12.9 °C to 15.3 oC). LC properties of a present novel series are compared with the structurally similar homologous series. Present series is partly smectogenic and partly non mesomorphic with poor degree of mesomorphism and middle ordered melting type without exhibition of nematogenic behavior.
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