Temat: Mesomorphism - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

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Skocz do pozycji: 2.

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

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