Wide-Angle Scattering Experiments

The other geometric consideration is the relative orientation of the scattering vector, q, and an applied field, such as a flow or electric field. For example, as seen in Chapter 6, the use of homodyne dynamic light scattering to measure velocity gradients requires that q be oriented parallel to the component of the velocity of interest. This is simply accomplished by having that velocity component directed parallel to the vector bisecting k(. and k [44], 

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In polymer research the information which can be obtained from small angle and wide angle scattering is often complimentary (see Sect. 4) which suggests to use a small angle scattering camera for both types of experiments. Practical arguments like the... 

Davies RJ, Koenig C, Burghammer M, Riekel C. On-axis microbeam wide- and small-angle scattering experiments of a sectioned poly(/ -phenylene terephthalamide) fiber. Appl Phys Lett 2008 92 1019011-10190133. 

Rossle, M., Panine, P., Urban, V. S., and Riekel, C. (2004). Structural evolution of regenerated silk fibroin under shear Combined wide- and small-angle x-ray scattering experiments using synchrotron radiation. Biopolymers 74, 316-327. Rousseau, M. E., Lefevre, T., Beaulieu, L., Asakura, T., and Pezolet, M. (2004). Study of protein conformation and orientation in silkworm and spider silk fibres using Raman microspectroscopy. Biomacromolecules 5, 2247-2257. 

The applications of wide angle light scattering are beyond the scope of this work and too numerous to be summarized here but we would like to call attention to some comprehensive reviews (12, 13), basic treatises ( 5, 6), conference proceedings (14, 13) and finally some representative articles, selected from our own experience, that introduce the basic size distribution information obtainable from wide angle light scattering. 

Wide angle light scattering experiments have been carried out with sufficient accuracy to separately identify dust or extraordinary particles, latex particles and small-molecule scattering. 

Figure 8.13 Wide-angle light scattering experiment and the scattering volume.

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