Download e-book for iPad: Applications of Liquid Crystals by Dr. Gerhard Meier, Professor Dr. Erich Sackmann, Dr. J. G.

By Dr. Gerhard Meier, Professor Dr. Erich Sackmann, Dr. J. G. Grabmaier (auth.)

ISBN-10: 3642809545

ISBN-13: 9783642809545

ISBN-10: 3642809561

ISBN-13: 9783642809569

Over the earlier ten years liquid crystals have attracted a lot curiosity and enormous growth has been made with recognize to our wisdom during this box. the new improvement used to be initiated generally through the paintings of J. L. Fergason and G. H. Heilmeier, who mentioned the significance of liquid crystals for thermographic and electro­ optic purposes. the 1st a part of this e-book is a quick creation to the physics of liquid crystals. The constructions and homes of the 3 simple varieties of liquid crystals are mentioned. a different paragraph is dedicated to electric-field results, that are very important in demonstrate purposes. The bankruptcy on clinical purposes provides an perception into the aptitude functions of liquid crystals in basic examine, with exact emphasis on explaining the rules concerned. teams of strength purposes are mentioned intimately: 1. using liquid crystals as anisotropic solvent for the choice of molecular houses via spectroscopy, and a couple of. their use in analytical chemistry, quite in gasoline chromatography. The opposite method contains using the dissolved molecules as microscopic probes within the research of the dynamical molecular constitution of anisotropic fluid structures (e.g. organic membranes). This very important approach can also be described.

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Accordingly, the order generated by an electric field of such a field strength is not destroyed if the sample is rotated in the magnet of a conventional nmr- or esr-spectrometer. This method was first applied by Diehl et al. [33] using 4-methoxy-benzylidene-4-amino-o:methyl cinnamic acid-n-propyl ester (Ic). CH 30 ~O~ C=N ~ -10~;H /COO c 3 C=C, CH 3 H7 (Id) Use of smectic liquid crystals As noted above, smectic liquid crystals may be uniformly ordered by cooling a magnetic field-oriented nematic phase below the nematic-to-smectic transition temperature [6].

A typical nematic phase of this type is composed of 35 wt% sodium decyl sulfate, 7 wt% n-decyl alcohol, 7 wt% sodium sulfate and 51 wt% water (D 2 0 in nmr experiments). This solvent is stable between lOoC and 75°C. Moreover, these mixtures can be easily oriented homogeneously by magnetic fields. For some spectroscopic applications lyotropic lamellar mesophases of soaps may be of great value. Lamellar liquid crystals are formed in sodium decanoate-decanolwater systems [14]. A convenient system is obtained by mixing 28 wt% sodium 80 26 E.

By varying the ratios of these distances and the order parameter, agreement between calculated and observed spectra was first achieved for those lines which the positions are independent of the indirect coupling constants J jj . The absolute values of the Jij were obtained from the spectrum in an isotropic solvent. Then the signs of the Jij were varied until complete agreement between observed and calculated spectrum was achieved (cf Fig. 7b). 1 %. The analysis of these spectra yields values of all indirect and direct C-H-coupling constants.

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Applications of Liquid Crystals by Dr. Gerhard Meier, Professor Dr. Erich Sackmann, Dr. J. G. Grabmaier (auth.)

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