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    Wyświetlanie 1-7 z 7
    Tytuł:
    Dependence of Mesomorphism on meta Substituted Lateral Groups
    Autorzy:
    Jain, B. B.
    Patel, R. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1191468.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Smectic
    Nematic
    Mesomorphism
    Liquid Crystals
    monotropy
    Opis:
    Thermotropic LC substances of chalconyl derivatives consisting of two phenyl rings, one chalconyl central bridge and two flexible {-OR and -OC7H15(n)} terminal (para) / lateral (meta) functional groups i.e. RO-C6H4-CH=CH-CO-C6H4-OC7H15(n) (meta) have been synthesized and studied for the effect of molecular structure on thermotropicmesomorphism. The thermometric behaviours of novel homologue substances and their textures were determined by an optical polarizing microscopy (POM) equipped with a heating stage. Textures of a nematic phases are threaded or schlieren. The textures of monotropicsmectic phase are directly judged from the heating top as smectic-A. Analytical, thermal and spectral data supports and conforms the molecular structures of homologues. Transition curves as depicted in a phase diagram behaves in normal manner. Odd-even effect for N-I transition curve (very short) is observed. Total (C1 to C18) thirteen homologues are synthesized .Mesomorphism commences from C7 homologue. C7 to C8 homologues are enantiotropicnematic and C10 to C18 homologues are monotropicllynematogenic plus smectogenic. Thermal stability of smectic phase is about fraction of 1.0 °C or 1.0 °C and that of nematic phase is 66.0 °C with total mesophaselength minimum to maximum 7.0 °C to 15 °C. Group efficiency order for mesophases is derived on the basis of thermal stabilities from the comparative study of thermometric data determined from structurally analogous series. Hence present novel series behaves in normal manner with very short mesophaselengths, low thermal stabilities and low melting type and predominantly nematogenic and partly smectogenic.
    Źródło:
    World Scientific News; 2016, 40; 199-210
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dependence of Molecular Flexibility of Lateral Group on Mesomorphism
    Autorzy:
    Jain, B. B.
    Patel, R. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1191454.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Liquid Crystals
    Smectic
    Nematic
    monotropy
    Enantiotropy
    Opis:
    A Chalconyl homologous series: RO-C6H4-CH=CH-CO-C6H4-OC12H25(n) (meta) of novel liquid crystalline (LC) derivatives of thermotropic variety have been synthesized and studied with a view to understand the effect of molecular structure on LC behaviours with reference to varying flexibility due to tailed end group for the same homologue and from homologue to homologue in the same series. A novel series consisted of thirteen homologues whose first member is nonliquidcrystals and the rest of the homologues are LC in enantiotropic or monotropic condition. Nematogenic mesomorphism commences from C2 homologue. C2 to C5 homologues are enantiotropic nematic and C6 to C18 homologues are monotropic nematic. Smectogenic character commences from C4 homologue as enantiotropic manner and C6 to C18 derivatives are monotroic smectic. Transition temperatures and textures of mesophases were determined by an optical polarising microscopy (POM) equipped with a heating stage. The transition curves of a phase diagram behaved in normal manner. Spectral, analytical and thermal data supported the molecular structures of homologues. Thermal stability for smectic is low of the order of 56.0 °C and that of the nematic is 70.5 °C. The corresponding mesophaselengths for smectic and nematic are varied minimum to maximum are 1 or 2 °C to 15 °C and 5 to 29 °C respectively. The group efficiency order derived on the basis of thermal stability .
    Źródło:
    World Scientific News; 2016, 40; 135-146
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis, Characterization and Mesomorphic Study of new Homologous Chalcone Series
    Autorzy:
    Jain, B. B.
    Patel, R. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1182886.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    liquid crystal
    smectic
    nematic
    enantiotropic
    mesomorphism
    Opis:
    A new designed mesogenic homologous series of chalconyl derivative with two ring α-4-Alkoxy benzoyl-β-4/-tetradecyloxy phenyl ethylenehave been synthesized and characterized by a combination of elemental analysis and standard spectroscopic methods. In series, lower members (C5 to C8) exhibit only enantiotropicnematicmesophase but higher members (C10,C12,C14,C16,C18) exhibit enantiotropicnematic as well as smecticmesophase. The nematicmesophase (Thread type) commence from C5 homologue and smecticmesophase(smectic-A type texture) commence from C10 homologue as enantiotropic and persists up to the last member synthesized. Textures are conformed by Polarizing Optical Microscope (POM). The mesomorphic properties of present series were compared with other two structurally similar series to study the effects of change of meta and para position on the mesomorphism.
    Źródło:
    World Scientific News; 2016, 53, 3; 241-252
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular Structure Dependance of Mesomorphism in Chloro Substituted Azoester Series
    Autorzy:
    Jadeja, U. H.
    Patel, R. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1191208.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Azoester
    Liquid Crystal
    Smectic
    Nematic
    Enantiotropy
    Opis:
    Azoester novel homologous series RO-CH:CH-COO-C10H6-N:N-C6H4-Cl (ortho) from trans cinnamic acid and α-napthol using ortho chloro aniline has been synthesized and studied with a view to understand and establish the relations between thermotropic liquid crystalline (LC) behaviours of homologues and their molecular structure as a consequence of molecular rigidity and flexibility with changing number of methylene unit present in left n-alkoxy group (-OR) of a molecule. Novel azoester series consists of thirteen (C1 to C18) homologues. C6 to C18 homologues are enantiotropically nematogenic with absence of smectic property. C1 to C5 members are nonliquid crystal. Textures of nematic phase and transition temperatures were determined by an optical polarising microscopy (POM) equipped with a heating stage. Textures of nematic phase are threaded or schilieren. Phase transition curves Cr-N/I and N-I behaved in normal manner in a phase diagram. Analytical and spectral data confirmed molecular structures of homologues. Nematic thermal stability is 145.12 and the degree of mesomorphism vary from 26.0 °C to 46.0 °C at the C14 and C7 homologues respectively. The LC properties of present azoester series are compared with structurally analogous series. Thus, novel series is enantiotropically nematogenic whose mesogenic range is good enough and of middle ordered melting type.
    Źródło:
    World Scientific News; 2016, 54; 1-13
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular Structural Flexibility Dependence of Mesomorphism through Ortho–Substituted Nitro Group
    Autorzy:
    Ravalia, Sagarkumar U.
    Dube, Mukesh R.
    Bhoya, Umed C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193492.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Liquid crystal
    Mesophase
    Nematogenic
    Smectogenic
    Thermotropic
    Opis:
    A novel homologous series of liquid crystalline materials of schiff’s bases viz. RO-C6H4-CH=CH-COO-C6H4-N=CH-C6H4-NO2 is synthesized and studied with a view to understanding and establishing the effect of molecular structure on liquid crystal properties and to provide novel thermotropic LC material to the scientific and technological community of research interest. The novel series consist of 12 homologues. All members of the series are enantiotropically smectogenic character. The transition temperatures were determined by an optical polarizing microscopy equipped with a heating stage. Thermal stability of smectogenic mesophase is 132.2 °C and mesophase length is varies between 4.7 °C to 32.7 °C. The LC behaviour of the novel series compared with a structurally similar known series.
    Źródło:
    World Scientific News; 2021, 159; 59-70
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mesogenic Dependence of Chalconyl Schiff’s Bases on Molecular Rigidity and Flexibility
    Autorzy:
    Pandya, S. H.
    Patel, V. R.
    Doshi, A. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1178290.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Enantiotropy
    Liquid Crystals
    Mesomorphism
    Nematic
    Smetic
    Opis:
    A novel homologous series R0-C6H4.CH:N-C6H4.CO.CH:CH-C6H4-OC6H13(n) of liquid crystal property is synthesized and studied with a view to understand and establish the effect of molecular structure on liquid crystal properties with respect to Schiff base and chalconyl central bridges as well as changing left n-alkoxy terminal and right n-hexyloxy fixed tail ended group. Homologous series consisted of eleven (C1 to C16) homologues in which the nematogenic mesomorphism commences from C3 homologue and continued to last C16 homologue without exhibition of smectogenic property. Rest of the C1 and C2 homologues are nonmesomorphic, whose Latent transition temperature (LTT) are predicted by extrapolation of N-I transition curves. Odd-even effect is observed for N-I transition curve. N-I transition curve and Cr-N/I transition curve behaved in normal manner. The Nematic thermal stability is 72.2 ° C. The minimum and maximum nematogenic mesophaselengths are ranging between 12.0 °C and 30.0 °C at C16 and C14 homologue respectively. Transition temperatures were determined by an optical polarizing microscopy (POM), equipped with a heating stage. Thermal analytical and spectral data confirms the molecular structures of homologues. The novel homologous series of chalconyl Schiff’s base is low melting series, whose mesogenic transition temperatures ranges between 43.0 °C and 79.0 °C.
    Źródło:
    World Scientific News; 2017, 86, 3; 242-252
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nematogenic Mesophase Induced from Two Nonmesomorphs and Determination of LTT for Common Nonmesomorphic Component by Extrapolation
    Autorzy:
    Solanki, Ravindra
    Patel, R. B.
    Doshi, A. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1179586.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Binary System
    Eutectic point
    Mixed melt
    Mixed mesomorphism
    Nematic
    Opis:
    Three binary systems (A+B1, A+B2, A+B3) consisted of both admixed components as nonmesomorphs induces mesomorphic property as nematogenic mesophase within definite range of concentration of component - A. The Isotropic- Nematic (I-N) transition curves of each binary systems are extra polated to 100 mole percent of nonmesomorphic component –A to determine its reliable latent transition temperature (LTT) and to derive the group efficiency order. The common component A is a Schiff’s base, P-tolal. P’- Phenetidine (109 °C), uncommon component B1 and B2 are also Schiff’s bases p-Chloro benzal P’- chloroaniline (M.P 111.0 °C) and p-Anisal p’-Toluidine (M.P 92.0 °C) respectively, whereas, component B3 is a chalcone α- 4 methoxy phenyl β 4’-pentyloxy benzoyl ethylene (M.P 91.0 °C). The reliable predicted LTT of common component –A are 99.5 °C, 99.0 °C and 101.0 °C from binary systems A+B1 ,A+B2 and, A+B3 respectively. The group efficiency order derived is B2>B1>B3 from range of mesomorphism.The melting point of common and uncommon nonmesomorphic components are confirmed with previously reported values. Suitable magnitudes of anisotropic forces of intermolecular attractions as a consequence of resulted molecular rigidity and flexibility through respective polarity and polarizabilities of nonmesogenic components of the mesogenic mixitures which play an important role in inducing mesomorphism.
    Źródło:
    World Scientific News; 2017, 74; 68-79
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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