In isotropic phase

That both phenomena arise as a consequence of macroscopic solvent order and not Intimate solvent-solute Interactions Is clear Saeva and 01In (75) have shown that solute LCICD spectra can be observed In twisted nematic phases only Nakazaki et al. (76) find an excess of one enantiomer of hexahelicene Is produced photochemlcally from achiral precursors In twisted nematic phases no LCICD spectra or optical Induction occurs In untwisted nematic phases and the handedness of the twist can be correlated with the sign of the LCICD and the preferred product enantiomer. Furthermore, Isotropic phases of cholesteric mixtures display no discernible LCICD spectra (12, 67) and the enantiomeric excesses In products of photolablle reactants In Isotropic phases are near zero (51). 

There exists a fairly large amount of experimental data on the 31P chemical shift of molecules dissolved in isotropic phases. However, one is still far from having a good rationale of the different factors which may influence the phosphorus chemical shift. The same is true for the other nuclei which may be studied by n.m.r. 

In Isotropic phases these three components are identical. 

Notwithstanding, a clear evidence for FDSE behavior in isotropic phase of... 

Fig. 3.12 Schematic models for isotropic (left) and nematic (right) phases of GO aqueous dispersions. GO sheets randomly distribute in isotropic phase and align with an orientational vector (n) perpendicular to the sheet planes in the nematic phase. Reproduced with permission from [116]. Copyright 2011 American Chemical Society...

FIGURE 6 Time response of first-order diffraction intensity in isotropic phase of 5CB. r - = 6°K. Cell thickness = 100 /im. 

Fig. 7 a Force on a Si3N4 AFM tip as a function of separation between the tip and the DMOAP silanated glass surface in isotropic phase of 8CB. A first layer is stable up to more than 10 K above Tin. This indicates that the first layer of liquid crystal molecules is strongly coupled to the substrate. Sometimes, even a second and third layer is observed just above the phase transition. As the tip was not completely spherical the tip radius could not be determined accurately... 

To describe short-range nematic order fluctuations in isotropic phases of nematics, the terms in Eq. (6.69) are retained up to quadratic in Q to give... 

Poniewierski and Stecki [245] combined hard Onsager spherocylinders with an attractive Maier-Saupe type quadrupolar potential. The Lenard-Jones interaction potential often used in isotropic phases with a repulsive term proportional to and an attractive part proportional to r" depends only on the intermolecular distances r, and is therefore not suited to the description of anisotropic fluids. A modification of this isotropic potential that accounts for the relative orientations of anisotropic particles has been proposed by Berne and Pechukas... 

The fourth mechanism of magnetic type is the one depending on the anisotropy of the screening tensor (improperly called chemical shift anisotropy and denoted CSA). The anisotropy of has direct consequences on NMR spectra when they are recorded for liquid crystals and solid state samples. In isotropic phases, the chemical shift only depends on the average value of (i.e., Tr a ). However, because of a anisotropy, the rapid... 

Fig. 10.25 Scattering angle dependence of autocorrelation function for the order parameter fluctuation in isotropic phase near isotropic-nematic phase transition temperature. Inset Dispersion relation of the order parameter fluctuation, which is independent of the wave number, together with the orientation fluctuation...

Fig. 10.30 (a) Autocorrelation functions in swollen banana liquid crystal. Closed symbols are observed in B4 phase (27 °C) and open symbols in Bx phase (35.1 °C). (b) Autocorrelation functions in 5CB. Closed symbols are observed in nematic phase and open symbols in isotropic phase... 

Fig. 19.2 Illustration of molecular arrangemtaits of LCER system under different condition (a) heating and melting, (b) curing in isotropic phase, (c) curing in Tmr with the formation of polydomain structure (d) curing in Tmr with applied electrical ot magnetic field with the formation...

NONLINEAR ABSORPTION AND OPTICAL LIMITING OF SHORT LASER PULSES IN ISOTROPIC PHASE LIQUID CRYSTALS AND LIQUIDS... 

He, G. S., T.-C. Lin, P. N. Prasad, C.-C. Cho, and L.-J. Yu. 2003. Optical power limiting and stabilization using a two-photon absorbing neat liquid crystal in isotropic phase. Appl. Phys. Lett. 82 4717-19. 

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