Light scattering curves

Figure 4 shows the light-scattering curve for nine selected potassium aluminosilicate solutions. Two types of behaviour were apparent. For low-silica solutions, a low, steady amount of scattered light is followed by a sharp increase as the solution becomes cloudy prior to gelling, possibly suggesting a nucleation-and-growth mechanism. There is a direct relation between the persistence of the low value and the observed gel time - the... 

Figure 4 Light scattering curves for potassium aluminosilicate solutions prepared by Method 1 of mixing. All curves are scaled as for solution 1a.

FIG. 5 Light scattering curves for isolated bovine rod outer segment disk membrane in aqueous sucrose of the indicated concentrations. ( ) unbleached and (O) bleached membranes. (Reprinted from T. Norisuye and H. Yu. Osmotically-induced and photo-induced deformations of disk membranes. Biochim. Biophys. Acta 477 441. Copyright 1977. With kind permission from Elsevier Science NL. Sara Burgerhartstraat 25. 1055 KV Amsterdam. The Netherlands.)... 

Figure 41. Absorption (A) and circular dichroism (B) spectra of poly-L-glutamic acid, pH 3.85, as a function of particle size, which is achieved by sonication. As particle size increases, the ellipticity and absorption extrema are progressively dampened there is increased light scattering (curve b and c of A), and there is a marked red shifting of the CD extrema and crossover. These are distortions in the spectra due to the particulate nature of the optically active system. Adapted, with permission, from [110].

A quantitative measure of luster can be calculated from a light scattering curve (Figure 10.5) by the following relationship [181] ... 

These findings confirm the model of polydisperse systems of homogeneous spheres by exact fits of the static light scattering curves, the expected M a3 dependence for PEC homologues prepared at different polymer concentrations, and the asymptotic q 4 behavior of compact spheres. The quantitative information obtained shows that the concentration of the component solutions does not affect the internal structure of the PECs remarkably but controls their level of aggregation to a great extent. 

Figure 5-41. Schematic of light scattering curves illustrating a normal untreated hair fiber (solid fine) and a fiber with scales lifted (dashed line).

Light striking hair in a root-to-tip direction at an incident angle of 30°, provides a specular reflection of 24° (large peak of Figure 8-37), rather than 30°. The specular reflectance may be estimated from light-scattering curves... 

Figure 8-37. Light-scattering curves from dark brown hair (solid line) and blond hair (dashed line) [153], Reprinted with permission of the Journal of the Society of Cosmetic Chemists.

FIGURE 5. Light scattering curves show micellization first at 15% water per weight in a W/0 microemulsion with 50% decane, stabilized by potassium oleate and pentanol (Sjoblom, 1978), (30% counted on water, surfactant and cosurfactant). 

Emmerling et al. [24] as well as Reim et al. [40] showed that it is possible to combine SAS and light scattering curves thus extending the experimental -range to q values as low as 10 nm and including information on structures in the micron range. 

Fig. 3.36. Light scattering curves obtained for a PB (M = 5.8 10 )/PIP (M = mixture during the late stage of spinodal decomposition at the indicated temperatures top] curves for 45 °C and 60 °C are shifted by constant amounts in vertical direction). Each curve contains measurements for different times and these superpose exactly. Time dependence of the interfacial area per unit volume, O12, in agreement with a power law O12 t, as indicated by the straight line with slope -1 bottom). Data from Takenaka and Hashimoto [24]...

Figure 4.8 Comparison of light-scattering curves for adiphenine hydrochloride and its rigid analogue pavatrine hydrochloride showing the influence of the rigidity of the hydrophobic group on the aggregation characteristics. From Attwood et ai [22] with permission.

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