Order parameter determination

Biological membranes Fluidity and order parameters Determination of the phase transition temperature Effect of additives (e.g. cholesterol)... 

The minimum of Landau free energy functional with respect to the order parameter determines the equilibrium state of the system. The deviations of the order parameter from the equilibrium value describe equilibrium thermodynamic fluctuations. 

Results obtained using the order parameter determined by SALS, as the value of the orientation efficiency factor, are always closer to the lower bound values of the Young s modulus of the composites. The order parameter is determined as a function of the angle of the fibers to the shear direction, meaning that its value will be more accurate for an in-plane distribution of the fibers. This would probably be the case if the fibers had higher aspect ratio. Nevertheless, SALS seems to be a promising... 

The d5mamic order parameters determined by the above methods can be compared to those measured by other NMR techniques if the specific d5mamic... 

Corresponding methyl ester, alcohol, and acetate also examined. Order parameter determined. 

Spectrum recorded above and below nematic-isotropic transition temperature order parameters determined. 

Little need be said concerning this type of order parameter determination. It is evident from Eq. [17] that the only requirement in evaluating from macroscopic anisotropy measurements is a knowledge of the maximum possible magnitude of the anisotropy being measured. Clearly, this is the anisotropy that would be measured in a perfectly ordered nematic phase and can be obtained by means of a little algebra from the crystalline anisotropy. Diamagnetic, dielectric, and optical anisotropy measurements have been used extensively to... 

The single molecule scattering has its maximum at Q = 0 where So(Q) is fixed by the number of substituted atoms in the molecule so the scaling parameter, K, is easily determined. This means that all of the order parameters may be determined individually. However, there are a number of experimental factors that can influence the accuracy of the order parameters determined by the single molecule scattering method. 

FIGURE 3 Orientational order parameters determined for PAA (points) compared with the predictions of the Maier-Saupe theory (line). 

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