Anisotropic light scattering

Kazansky PG, Inouye H, Mitsuyu T, Miura K, Qiu J, Hirao K, Starrost F (1999) Anomalous anisotropic light scattering in Ge-doped silica glass. Phys Rev Lett 82 2199-2201... 

Fig. 31. Theoretical curves of the angular dependence of the anisotropic light scattering (vertical polarization detection of horizontal component) for a random collection of anisotropic rods of length L and diameter d, Eq. (IV-35) [Van Aartsen...

Fig. 33. Experimental curves of the angular dependence of anisotropic light-scattering of some chemically crosslinked polyurethane rubbers. The first number in the code refers to the average number of oxypropylene units between crosslinks and the second number to the average number of urethane links per chain. More such links seem to yield more anisotropic scattering and thus more "bundle like"...

The correlation factor jRcn(y) is specific to and determinable from the Cotton-Mouton effect " as well as from anisotropic light-scattering A. Piekara, Con t. rend., 1939, 208, 990. 

S. Wozniak and S. Kielich. Influence of interaction between non-dipole solvent and dipole solute molecules on anisotropic light scattering. Acta Phys. Polonica A, 52 863-873 (1977). 

S. Kielich. Role of molecular interactions in anisotropic light scattering by liquids. J. Chem. Phys., 46 409(M099 (1967). 

S. Kielich. Many-molecular correlation-induced anisotropic light scattering and birefringence in simple fluids. Optics Communic., 4 135-138 (1971)... 

O, Theimer and R. Paul. Anisotropic light scattering by inner-field fluctuations in a dense, monatomic gas, J. Chem. Phys., 42 2508-2517 (1965). 

The luminance enhancement was observed with the free-standing anodic alumina film by the naked eye because of anisotropic light scattering by spatially arranged nanometer-size pores. Fig. 1 demonstrates a high transparency of the free-standing anodic alumina film produced as compared to the reference Kimoto PF-90S M/M scattering film. 

The results obtained show that nanoporous structure of electrochemically anodized alumina films can be purposefully used to control light propagation, namely, to perform anisotropic light scattering in LCD backlight systems as well as potential modification of light polarization. 

ANISOTROPIC LIGHT SCATTERING BY POROUS ANODIC ALUMINA... 

The field induced orientation of poly-4BCMU in toluene in the red phase (<72 C) indicates an anisotropic polarizability tensor characteristic of a rodlike conformation. The field-induced signal from the polymer in its coil conformation (yellow phase) is extremely weak (smaller by a factor of at least 10 ) confirming the rod-coil transition. From studies of the transient response of the anisotropic light scattering from the red solution, we find a rotational relaxation time of 0.1 sec. This value is consistent with the rotational diffusion constant expected for rodlike polydiacetylene macromolecules. 

Turner, L., 1973. Raylcigh-Gans-Born light scattering by ensembles of randomly oriented anisotropic particles, Appl. Opt., 12, 1085-1090. 

Compared to the colligative methods light scattering can yield information on a possible dissymmetry of the aggregates. For anisotropic particles the direction of the electric field associated with the incident light may not coincide with the shift of the electron cloud. The intensity of light scattered at (usually) 90° from anisotropic aggregates is increased over the value predicted on the basis of isotropy by the Cabannes factor. 

Example. A tailings stream from the hot-water flotation process (oil sands) contains 27 % (mass) solids. Estimate the suspension viscosity. Light-scattering analysis indicates that the particles are finely divided and anisotropic with a 10 Tm major dimension and a 0.5 pm minor dimension. Using Eq. 

In colloidal suspensions of anisotropic particles, the static structure factor plays a prominent role in particle size analysis. We have used transient electric birefringence (TEB) and electron microscopy, in addition to laser light scattering, to correlate our analysis of particle size distributions of bentonite suspensions. The complementary nature of TEB and photon correlation spectroscopy (PCS) in particle size analysis will be discussed. 

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