An Introduction to Dynamic Light Scattering by by Kenneth S. Schmitz

By Kenneth S. Schmitz

Dynamic mild scattering (DLS) concepts offer information regarding measurement, form, and suppleness of debris in addition to providing perception in regards to the nature of the interactions among debris and their environments. This booklet deals a research of DLS by way of macromolecular and polyelectrolyte answer

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B 2 for a system of identical interacting particles is given by 1 B2 = 2 ( [0 iHW-l]dr. 5) 0 Hence Eq. 4. + Mp E = _L Ml Excluded Volume Contribution + 2 A (2 .. 8 6) Mp to B 2 The interaction potential for a system of identical hard spheres is defined (2) for two regions: U(r) = o o for r < 2 P S , hence g 2(r) = 0; and U(r) = 0 for ( r > 2 P S , hence g i\(r) = 1. Thus B 2 = + 4 F S , where Vs is the hard sphere volume for one particle. 5. B 2 for Weak, Long-Range Interactions It is assumed that U(r) = (a/r) exp( — br), which is the form of the potential for many types of screened interactions, such as the screened Coulomb interaction and screened hydrodynamic interactions.

2) (R G}, T where the linear term averages to zero and < # g > is defined as the mean-square radius of gyration of the macromolecule. The operating equation for data interpretation is now Hcn 1 Re MN « K R G > « 1). 7. 23 Light Scattering by Large, Noninteracting Particles c Fig. 3. Internal structure factors. Κ = (47rn o/A o)sin(0/2) is the scattering vector and d represents the characteristic dimension of the molecule. The inside/outside ratio of radii for the hollow sphere was 1/10. T h e solid line shows the structure factors for a rigid rod; the dashed line, for a solid sphere; the dot-dashed line, for a hollow sphere; and the dotted line, for a Gaussian coil.

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