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Light scattering from two-component solutions

In Chapter 3, the scattering function for a single macromolecule was introduced. The scattered intensity was shown to be a function of the magnitude of the scattering vector q. hi this section, the value of q is restricted to the very low range. At each concentration, there is a characteristic distance, L between solute molecules that is proportional to When the quantity qL 1, it is convenient to treat the solution as a continuum characterized by a local concentration, that fluctuates in both position and time. If the [Pg.53]

The results of a light-scattering experiment are usually expressed in terms of a scattering cross section called the Rayleigh ratio, R(q). It is defined as  [Pg.53]

The partial derivative can be related to the osmotic pressure. The excess Rayleigh ratio for concentration fluctuations can then be expressed as  [Pg.54]

To focus on the variables that change with the solution, the excess Rayleigh ratio is often written as  [Pg.54]

In the thermodynamic limit ( - 0), measurement of the solution structure factor is a good method for obtaining the osmotic second virial coefficient. Measmements of the excess Rayleigh ratio as a function of concentration yield the molecular weight of the solute within this limit. The usual procedure is to plot the quantity Kc/AR c) against concentration  [Pg.54]


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Components light

Light solution

Scattering component

Solutions components

Two solutions

Two-component

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