摘要:

A partial phase diagram of the potassiumN-tetradecanoyl-L-alaninate/decanol/water (+10 per cent CsCI) system has been charted using polarizing microscopy, laser diffraction, and NMR spectroscopy. At low amphiphile concentrations, a chiral nematic ChDphase with disc-like micelles occurs and at higher concentrations there occur a chiral nematic, ChCphase with cylindrical micelles and a chiral version of a dimensionally-ordered (probably rectangular or hexagonal) phase. Between the Chcphase and the genuine isotropic liquid there is a chiral isotropic phase which appears to be a micellar analogue of a thermotropic blue phase. This isotropic chiral Icphase showed flow birefringence.

ISSN:0267-8292    

DOI:10.1080/02678299508036604

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

Novel liquid crystalline compounds based on 5-methyl-5′-(4-n-alkoxyphenylvinyl)-2,2′-bipyridine were synthesized and their mesomorphic properties investigated. All members of this series exhibit nematic, smectic A and smectic B phases. For the octyloxy compound an hexatic phase is also observed.

ISSN:0267-8292    

DOI:10.1080/02678299508036605

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

Esterification of 2,2′-bipyridine-5,5′- and 4,4′-dicarboxylic acids with 4-alkoxyphenols leads to new mesomorphic bipyridine esters. The synthesis and properties of the compounds are discussed and compared with some carbocyclic analogues.

ISSN:0267-8292    

DOI:10.1080/02678299508036606

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

Following our discovery of liquid crystals based on octahedral manganese(I), we have now extended these studies to the synthesis of what we believe to be unique examples of mesomorphic rhenium-based complexes. These complexes offer advantages over the related manganese(I) systems in that they are more thermally stable. Further, modification of the organic backbone has led to lower melting manganese materials.

ISSN:0267-8292    

DOI:10.1080/02678299508036607

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

We describe here a novel technique which makes use of the photothermal mirage effect to study phase transition in liquid crystals. Results of the measurements done with two nematic liquid crystals are given to illustrate this technique. We observe an enhancement in the signal amplitude during phase change which is due to the large magnitude of the refractive index gradient developing at the transition temperature.

ISSN:0267-8292    

DOI:10.1080/02678299508036608

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

The angular dependence of the surface anchoring energy of the nematic liquid crystal 5CB on a bistable surface is measured using a twist-cell method. Anchoring bistability is obtained by a grazing SiO evaporation on glass. The data obtained are in good agreement with the simplest fourth order expansion in terms of the order parameter. The bistable anchoring is weak.

ISSN:0267-8292    

DOI:10.1080/02678299508036609

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0267-8292    

DOI:10.1080/02678299508036583

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor