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    Wyświetlanie 1-4 z 4
    Tytuł:
    Mesomorphic properties of liquid crystalline compounds with central linkage chalconyl ester and laterally substituted bromo group
    Autorzy:
    Patel, Patel
    Patel, R. B.
    Shah, R. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1191246.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Nematic; Liquid crystalline; Mesomorphic; Enantiotropic
    Smectic
    Opis:
    To investigate the mesomorphic property of the substitution on mesomorphism, the new series of liquid crystals having the following structures have been synthesized. Presently synthesized series contain thirteen homologue (C1 to C8, C10, C12, C14, C16, C18) in which eleven homologue (C3 to C18) shows both smectic as well as nematic phase during heating and cooling condition in enantiotropic manner, while C2 homologue shows only nematic phase. All the homologues were characterised by elemental analysis and spectroscopic techniques like 1H-NMR and IR analysis. Their liquid crystalline behaviours were measured by polarised optical microscope (POM) and Differencial Scanning Calorimetry (DSC).
    Źródło:
    World Scientific News; 2016, 54; 202-216
    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:
    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:
    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
      Wyświetlanie 1-4 z 4

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