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Principles of Colloid and Surface Chemistry, Revised and Expanded, 3rd Edition by CRC Press

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isI0=2π2[n (dn/dc)]2kBTcr2λ4(πosm/c)0,T(1+cos2ϕx)

(20)

In Chapter 3 we developed expressions for the equilibrium osmotic pressure of a solution as a function of its concentration. Equation (3.34) may be written

πosm=RT(cM+Bc2)

(21)

Since Equation (21) applies at equilibrium, we may evaluate (∂πosm/∂c)0,T from Equation (21):

(πosmc)0,T=RT(1M+2Bc)

(22)

Combining Equations (20) and (22) yields

isI0=2π2[n(dn/dc)]2cNAr2λ4(1/M+2Bc)(1+cos2ϕx)

(23)

Before looking at the experimental aspects of light scattering, it is convenient to define several more quantities. First, a quantity known as the Rayleigh ratio Rθ is defined as

Rθ=isr2I0(1+cos2θ)

(24)

where θ is the value of ϕx measured in the horizontal plane. According to Equation ...

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