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Autor:
Horst Stegemeyer
Publikováno v:
Liquid Crystals Today. 22:55-61
The Maier–Saupe theory is one of the most successful descriptions of the liquid crystalline state. While Saupe is a familiar name in liquid crystal research, his doctoral supervisor Wilhelm Maier is lesser known. We still remember Wilhelm Maier, ev
Publikováno v:
Nachrichten aus der Chemie. 52:903-908
Flussigkristallforschung reicht weiter zuruck als in den Geschichtsbuchern der Chemie festgeschrieben. Bereits 1854 hielt Rudolf Virchow mit der von ihm als „Myelin” bezeichneten Substanz die ersten lyotropen Flussigkristalle in Handen. Dieser lo
Autor:
Horst Stegemeyer
Lyotrope Flüssigkristalle stellen den ältesten Typ des vierten Zustandes der Materie dar, welcher die Eigenschaften kristalliner Festkörper und normaler Flüssigkeiten in sich vereint und deshalb Mesophase genannt wird. Trotz vielfältiger Anwendu
Autor:
Horst Stegemeyer
In 1959, about 1400 compounds forming liquid crystalline phases were known; by 1992, this number had increased to about 50 000. In portable devices like wristwatches, pocket caculators, measuring instruments, and laptop computers the liquid crystal d
Publikováno v:
Langmuir. 19:5223-5232
Since the pioneering work of Jelley and Scheibe, it has become a widely accepted fact that the cationic dyestuff pseudoisocyanine chloride (PIC) forms large, chainlike aggregates in aqueous solutio...
Publikováno v:
Liquid Crystals. 25:349-355
The phase ordering kinetics of various liquid crystalline materials from well known series (PCH, CCH, nO. m, BCH and CB) when turning from a disordered to an ordered phase induced by a rapid temperature quench have been investigated. The process of p
Publikováno v:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals. 300:179-189
The orientational order of a surface aligned nematic side chain polymer has been measured by proton NMR. The alignment of the mesogenic units is reflected in the angular dependence of the line width. It was possible to produce partly oriented polydom
Publikováno v:
Europhysics Letters (EPL). 39:257-262
Electrohydrodynamic convection due to the Carr-Helfrich (CH) effect has been extensively investigated in nematics. It has been predicted also for freely suspended smectic C and C* films. On the other hand, in smectic A films another type of electroco
Publikováno v:
Physical Review E. 54:6387-6403
Based on recent experimental results, a molecular model of the ferroelectric ordering in the induced smectic-${C}^{*}$ phase is proposed in terms of a coupling between dipole and quadrupole ordering of chiral molecules. The analysis of the correlatio
Publikováno v:
Liquid Crystals. 21:557-563
The relationship between the helical twisting power (HTP) of cholesteric liquid crystals and the molecular structure of the chiral mesogens has been investigated. Rod-like mesogens are compared with analogues bearing a bulky lateral branch. Additiona