Nematic Phase In Binary Mixture Research Articles

Statement of Retraction: Formation of Lyotropic Micellar Nematic Phase in Binary Mixture of Liquid Crystals

This article refers to:Formation of Lyotropic Micellar Nematic Phase in Binary Mixture of Liquid Crystals

Uniaxial and biaxial nematic phases in binary mixtures of banana-shaped molecules

We introduce a mean-field theory to describe uniaxial and biaxial nematic phases in binary mixtures of banana-shaped molecules. We extend our previous theory for pure banana-shaped molecules to the binary mixtures and calculate phase diagrams on the temperature-concentration plane. We predict uniaxial-biaxial nematic phase transitions and Landau points in the binary mixtures. The biaxial nematic phases of banana-shaped molecules are promoted by mixing the two components with different bend angles.

The formation of biaxial nematic phases in binary mixtures of thermotropic liquid-crystals composed of uniaxial molecules

ABSTRACTMonte Carlo simulations in the isothermal-isobaric ensemble are used to investigate the formation of an ordered, biaxial nematic phase in a binary mixture of thermotropic liquid crystals. The orientational dependence of the interaction between molecules of each pure component is the same as in the well-known Maier-Saupe model; each pure component of the mixture is therefore capable of forming a uniaxial nematic phase. For the interaction between molecules of different components, we use the same Maier-Saupe model but change the sign of the coupling constant. As a consequence a T-shaped arrangement of these molecules is energetically favoured. The formation of the biaxial phase occurs in two steps. At higher temperatures T, one of the components forms a uniaxial nematic phase whereas the other is in a quasi two-dimensional restricted isotropic liquid state. We develop a simple theoretical model to understand the high degree of (ostensible) nematic order in the latter. At lower T, the second component becomes nematic and then the entire mixture of the two compounds has biaxial symmetry. The biaxial nematic phase does not demix into domains rich in molecules of one or the other species.

Twist-bend nematic phases in binary mixtures of banana-shaped liquid crystalline molecules

ABSTRACTWe present a mean field theory to describe twist-bend nematic () phases in binary mixtures of banana shaped, such as bent-core or dimer, liquid crystalline (LC) molecules with , where is a twist and is a bend elastic constant. We introduce the free energy for the mixtures by taking into account the director-pitch (DP) coupling of the consisting LC molecules ) and calculate the phase diagrams on the temperature-concentration plane. Our theory demonstrates that the isotropic (I), or para-nematic (), nematic (), and phases appear, depending on the strength of the DP coupling parameter and predicts various phase transitions: the first-order and transitions, and the second-order transition, etc., on the temperature-concentration plane. Our theory has a good agreement with the experimental phase diagrams of the mixtures.

Co-existent Biphasic Region of Nematic Phase in Binary Mixture of Abietic Acid and Glacial Acetic Acid

We report the results of our studies on the optical and thermal properties of binary mixture of compounds viz., Abietic acid and Glacial acetic acid. The mixture exhibits very interesting chromonic nature of co-existent biphasic region of nematic phase for different concentrations of Abietic acid sequentially when the specimen is cooled from its isotropic phase. The order parameter (S) of nematic phase is estimated with the help of optical anisotropy using the measured refractive index and density data. The temperature variation of experimentally found order parameter curve is well fitted with the Maier–Saupe theoretical curve. The temperature variation of electrical-conductivity has also been discussed. Formation of above molecular orientations has been confirmed by optical and DSC studies.

Formation of Lyotropic Micellar Nematic Phase in Binary Mixture of Liquid Crystals

We report the results of our studies on optical and thermal properties of two nonmesogenic compounds namely, dodecyl trimethylammonium chloride (DTAC) and Glacial acetic acid (GAA). The mixture exhibits very interesting schlieren texture of lyotropic micellar nematic phase, SmA and SmG phases, respectively, at different concentrations of DTAC sequentially when the specimen is cooled from its isotropic phase. The order parameter (S) of the lyotropic micellar nematic phase is estimated with the help of temperature dependence of optical anisotropy from the measured values refractive index and density data. The temperature variation of order parameter of the experimental curve is very well fitted with the Mayer–Saupe theoretical curve. Electrical conductivity has been discussed. The formation of above phases has been confirmed by optical and DSC studies.

The Effect of Molecular Structure on the Formation of Induced Nematic Phases in Binary Mixtures

Abstract A variety of 4-halophenyl-4′-alkoxybenzoates and 4-alkoxyphenyl-4′-halobenzoates were synthesized, their mesomorphic properties determined and compared with those of the analogous halo anils. The ability of these esters to form induced nematic phases (INPs) in binary mixtures was studied along with a variety of other mesogenic type compounds not having a nematic phase. The contact method was used to screen 258 mixtures for INPs in an attempt to determine which molecular structural features favored formation of this phase in binary mixtures. INPs were observed in many of these mixtures and with a wide variety of structures. Phase diagrams of some of these mixtures were obtained in order to compare the abilities of certain structural features to form INPs. Two types of diagrams were observed. Type I showed a narrow INP range ocurring over most of the composition range between two nearly linear SN and MI curves and was observed only when the two components had similar molecular lengths either short ...

Coexisting nematic phases in binary mixtures of liquid crystals

A general method is proposed for calculating the phase behaviour of binary mixtures of nematic liquid crystals in the mean field approximation. Coexisting nematic phases are predicted at low temperatures.

New two‐ring compounds exhibiting reentrant nematic phases in binary mixtures

Crystal Research and TechnologyVolume 17, Issue 9 p. K95-K99 Short Note New two-ring compounds exhibiting reentrant nematic phases in binary mixtures Dr. G. Pelzl, Corresponding Author Dr. G. Pelzl Sektion Chemie der Martin-Luther-Universität Halle, and VEB Spezialchemie Apolda, Betriebsteil Leipzig G. Pelzl, Sektion Chemie der Martin-Luther-Universität, WB Physikalische Chemie DDR-4020 Halle/Saale Mühlpforte 1 S. Kallweit, Sektion Chemie der Martin-Luther-Universität, WB Physikalische Chemie DDR-4020 Halle/Saale Mühlpforte 1 I. Latif, Sektion Chemie der Martin-Luther-Universität, WB Physikalische Chemie DDR-4020 Halle/Saale Mühlpforte 1 W. Weissflog, VEB Spezialchemie Apolda, Betriebsteil Leipzig, Abt. FE DDR-7143 Leipzig-Lützschena ElsteraueSearch for more papers by this authorDipl. Chem. S. Kallweit, Corresponding Author Dipl. Chem. S. Kallweit Sektion Chemie der Martin-Luther-Universität Halle, and VEB Spezialchemie Apolda, Betriebsteil Leipzig G. Pelzl, Sektion Chemie der Martin-Luther-Universität, WB Physikalische Chemie DDR-4020 Halle/Saale Mühlpforte 1 S. Kallweit, Sektion Chemie der Martin-Luther-Universität, WB Physikalische Chemie DDR-4020 Halle/Saale Mühlpforte 1 I. Latif, Sektion Chemie der Martin-Luther-Universität, WB Physikalische Chemie DDR-4020 Halle/Saale Mühlpforte 1 W. Weissflog, VEB Spezialchemie Apolda, Betriebsteil Leipzig, Abt. FE DDR-7143 Leipzig-Lützschena ElsteraueSearch for more papers by this authorDipl. Chem. I. Latif, Corresponding Author Dipl. Chem. I. Latif Sektion Chemie der Martin-Luther-Universität Halle, and VEB Spezialchemie Apolda, Betriebsteil Leipzig G. Pelzl, Sektion Chemie der Martin-Luther-Universität, WB Physikalische Chemie DDR-4020 Halle/Saale Mühlpforte 1 S. Kallweit, Sektion Chemie der Martin-Luther-Universität, WB Physikalische Chemie DDR-4020 Halle/Saale Mühlpforte 1 I. Latif, Sektion Chemie der Martin-Luther-Universität, WB Physikalische Chemie DDR-4020 Halle/Saale Mühlpforte 1 W. Weissflog, VEB Spezialchemie Apolda, Betriebsteil Leipzig, Abt. FE DDR-7143 Leipzig-Lützschena ElsteraueSearch for more papers by this authorDr. W. Weissflog, Corresponding Author Dr. W. Weissflog Sektion Chemie der Martin-Luther-Universität Halle, and VEB Spezialchemie Apolda, Betriebsteil Leipzig G. Pelzl, Sektion Chemie der Martin-Luther-Universität, WB Physikalische Chemie DDR-4020 Halle/Saale Mühlpforte 1 S. Kallweit, Sektion Chemie der Martin-Luther-Universität, WB Physikalische Chemie DDR-4020 Halle/Saale Mühlpforte 1 I. Latif, Sektion Chemie der Martin-Luther-Universität, WB Physikalische Chemie DDR-4020 Halle/Saale Mühlpforte 1 W. Weissflog, VEB Spezialchemie Apolda, Betriebsteil Leipzig, Abt. FE DDR-7143 Leipzig-Lützschena ElsteraueSearch for more papers by this author Dr. G. Pelzl, Corresponding Author Dr. G. Pelzl Sektion Chemie der Martin-Luther-Universität Halle, and VEB Spezialchemie Apolda, Betriebsteil Leipzig G. Pelzl, Sektion Chemie der Martin-Luther-Universität, WB Physikalische Chemie DDR-4020 Halle/Saale Mühlpforte 1 S. Kallweit, Sektion Chemie der Martin-Luther-Universität, WB Physikalische Chemie DDR-4020 Halle/Saale Mühlpforte 1 I. Latif, Sektion Chemie der Martin-Luther-Universität, WB Physikalische Chemie DDR-4020 Halle/Saale Mühlpforte 1 W. Weissflog, VEB Spezialchemie Apolda, Betriebsteil Leipzig, Abt. FE DDR-7143 Leipzig-Lützschena ElsteraueSearch for more papers by this authorDipl. Chem. S. Kallweit, Corresponding Author Dipl. Chem. S. Kallweit Sektion Chemie der Martin-Luther-Universität Halle, and VEB Spezialchemie Apolda, Betriebsteil Leipzig G. Pelzl, Sektion Chemie der Martin-Luther-Universität, WB Physikalische Chemie DDR-4020 Halle/Saale Mühlpforte 1 S. Kallweit, Sektion Chemie der Martin-Luther-Universität, WB Physikalische Chemie DDR-4020 Halle/Saale Mühlpforte 1 I. Latif, Sektion Chemie der Martin-Luther-Universität, WB Physikalische Chemie DDR-4020 Halle/Saale Mühlpforte 1 W. Weissflog, VEB Spezialchemie Apolda, Betriebsteil Leipzig, Abt. FE DDR-7143 Leipzig-Lützschena ElsteraueSearch for more papers by this authorDipl. Chem. I. Latif, Corresponding Author Dipl. Chem. I. Latif Sektion Chemie der Martin-Luther-Universität Halle, and VEB Spezialchemie Apolda, Betriebsteil Leipzig G. Pelzl, Sektion Chemie der Martin-Luther-Universität, WB Physikalische Chemie DDR-4020 Halle/Saale Mühlpforte 1 S. Kallweit, Sektion Chemie der Martin-Luther-Universität, WB Physikalische Chemie DDR-4020 Halle/Saale Mühlpforte 1 I. Latif, Sektion Chemie der Martin-Luther-Universität, WB Physikalische Chemie DDR-4020 Halle/Saale Mühlpforte 1 W. Weissflog, VEB Spezialchemie Apolda, Betriebsteil Leipzig, Abt. FE DDR-7143 Leipzig-Lützschena ElsteraueSearch for more papers by this authorDr. W. Weissflog, Corresponding Author Dr. W. Weissflog Sektion Chemie der Martin-Luther-Universität Halle, and VEB Spezialchemie Apolda, Betriebsteil Leipzig G. Pelzl, Sektion Chemie der Martin-Luther-Universität, WB Physikalische Chemie DDR-4020 Halle/Saale Mühlpforte 1 S. Kallweit, Sektion Chemie der Martin-Luther-Universität, WB Physikalische Chemie DDR-4020 Halle/Saale Mühlpforte 1 I. Latif, Sektion Chemie der Martin-Luther-Universität, WB Physikalische Chemie DDR-4020 Halle/Saale Mühlpforte 1 W. Weissflog, VEB Spezialchemie Apolda, Betriebsteil Leipzig, Abt. FE DDR-7143 Leipzig-Lützschena ElsteraueSearch for more papers by this author First published: 1982 https://doi.org/10.1002/crat.2170170920Citations: 3AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Citing Literature Volume17, Issue91982Pages K95-K99 RelatedInformation