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Articles by Carsten Tschierske
Total Records ( 3 ) for Carsten Tschierske
  Md Lutfor Rahman , Jahimin Asik , Sandeep Kumar and Carsten Tschierske
  Three banana-shaped monomers, i.e. 2,7-naphthalene bis[4-(4-allyloxyphenylazo)-benzoate], 2,7-naphthalene bis[4-(4-allyloxy-3-fluorophenylazo)benzoate] and 2,7-naphthalene bis{4-[4-(10-undecenyloxy)phenylazo]benzoate}, containing azobenzene as side arms, 2,7-dihydroxynaphthalene as central units and terminal double bonds as polymerisable functional groups, were synthesised and their mesophase behaviour investigated. Polarizing optical microscopy and DSC measurements reveal that all compounds exhibit nematic mesophases. The absorption spectrum of the trans-azobenzene groups displays a high-intensity π-π* transition at about 365 nm and a low-intensity n-π* transition at around 450 nm for all compounds. Hence, photochromism can be achieved by the introduction of the azo linkage to banana-shaped liquid crystals molecules.
  Zhiwu Luo , Yi Huang , Guanghui Wei , Xiaohong Cheng , Marko Prehm and Carsten Tschierske
  Novel amphiphilic block molecules consisting of a rigid 2-phenylthiophene or 5-phenylbithienyl core, with a polar glycerol group attached to the phenyl ring and one or two alkyl chains attached to the thiophene ring on the other side, have been synthesised by using Ni(0) and Pd(0) catalyzed coupling reactions as key steps. The thermotropic and solvent-induced liquid crystalline behaviour of these compounds was investigated by polarising optical microscopy and X-ray diffraction. The influence of the length, number and position of the alkyl chains, and the length of the rigid core, on their mesophase behaviour was investigated. Compounds with one alkyl chain in the terminal 5-position on the thiophene ring form only smectic A phases, compounds with two adjacent alkyl chains attached in the 4- and 5-positions of the thiophene ring exhibit thermotropic columnar mesophases, and those with two long alkyl chains attached to the 3- and 5-positions form columnar LC phases only in the presence of water. Another compound containing the longer 5-phenylbithienyl core unit and two alkyl chains attached in lateral positions to each of the thiophene rings is not mesogenic.
  Akira Moria , Tomohiko Itoh , Hisashi Taya , Kanji Kubo , Seiji Ujiie , Ute Baumeister , Siegmar Diel and Carsten Tschierske
  Mesomorphic properties of three-ring systems such as 2,5-dibenzoyloxytropones, 5-benzoylamino-2-benzoyloxytropones and 2,5-dibenzoylaminotropones with 4-alkoxy, 3,4-dialkoxy, and 3,4,5-trialkoxy groups on the benzoyl groups were investigated together with those of the corresponding benzenoids. Derivatives with two monoalkoxybenzoyl groups showed nematic and smectic A and C phases. Troponoid tetracatenars with two dialkoxybenzoyl groups had hexagonal columnar phases except for troponoids with two ester-connecting groups, whereas the corresponding benzenoids with two dialkoxybenzoyl groups were non-mesomorphic. All troponoid hexacatenars with two trialkoxybenzoyl groups formed hexagonal columnar phases. With the exception of benzenoid hexacatenars with two ester-connecting groups, the benzenoid hexacatenars showed hexagonal and tetragonal columnar phases. These mesomorphic properties were discussed from the standpoint of the difference of the core structure and the connecting group, where the amide-connecting group played a role to induce and enhance mesomorphic properties through hydrogen bonding.
 
 
 
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