摘要:

Tetra (4-sulphophenyl)-β-octamethyl-porphin has been synthesized with the object of studying how the structure of the macrocycle, the type and position of the substitutes, and the oharacter of the metal-complex generator influences the lyotropic mesomorphism. Its spectral properties and lyotropic mesomorphism in water-ammonia and water-NaOH systems have been studied.

ISSN:1058-725X    

DOI:10.1080/10587259508041732

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

We observed that the hapatic liquid crystal lipoid droplets (LCLD) of newborn ducks and newborn pigeons existed mainly in hepatic cells of hepatic cord and less in blood sinus, respectively with Braggdvalues of 36. 8 Å and 38. 4 Å obtained by small-angle X-ray scattering (SAXS). X-ray difraction (XRD) patterns made known that the fresh livers of newborn ducks and pigeons, dealt with freezing and thawing at room terperature, corresponded respectively to their own LCLD lipid crystals. The XRD data comparison indicated that the hepatic LCLD crystal of newborn pigeons was distinctively different from the hepatic LCLD crystal of newborn ducks and chickembroyos. They belonged in two different kinds of crystal phases. But any one of them was phase-mixture and contained a little of the other, each other.

ISSN:1058-725X    

DOI:10.1080/10587259508041733

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

A gas chromatography method is used to investigate the purity of dialkyl-diphenyl-diacetylene liquid crystal components and at the same time identify the structure and concentration of the major impurities.

ISSN:1058-725X    

DOI:10.1080/10587259508041734

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

Dimensions, shape and Polarizability of a weak-polar molecule and a space occupied by it in different molecular coordinate systems have been calculated. For various substances, the dependence of the clearing temperature on a shape of excluded volume is considered. The realistic values of molecular ionization potential are obtained from clearing temerature data according to Maier-Saupe theory.

ISSN:1058-725X    

DOI:10.1080/10587259508041735

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

Threshold and polarization characteristics as well as temperature dependence of a two-band generation of laser with distributed feedback (DF) based on induced cholesteric liquid crystals (CLC) were studied. Difference between threshold excitation intensities of these bands of generation points at the existence of two phase gratings in the helical structure of CLC. It is verified by the difference in the temperature behaviour of the wavelengths of the central lines of the bands.

ISSN:1058-725X    

DOI:10.1080/10587259508041736

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

We have undertaken the study of the physical properties e.g. density, optical birefringence and x-ray diffration of three liquid crystalline compounds having bicyclohexane rigid core and isolated C=C double bond in the chain. The physical properties of these liquid crystals are strongly affected by the positional changes of the double bond. We have measured the refrative indices (no, ne) for three diffarent wavelengths and calculated the polarizability values, (αo, αe) different temperatures. It is found that for all the compounds optical birefringence is very low (Δn < 0.1). We have also calculated the intermolecular distance, pseudo layer spacing, correlation length and the orientational order parameter values at different temperatures from low angle x-ray diffraction photographs of aligned samples. Orientational order parameters at different temperatures were calculated both from birefrigence and x-ray study.

ISSN:1058-725X    

DOI:10.1080/10587259508041737

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

A principally new method of simultaneous determination of refractive index and small values of helical pitch of cholesteric liquid crystals is proposed. Its accuracy, limitations and possible use are also discussed.

ISSN:1058-725X    

DOI:10.1080/10587259508041738

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

ISSN:1058-725X    

DOI:10.1080/10587259508041671

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor