Characterisation of Pyrogenic Aggregates with Multi-angle DLS

2 Characterisation of Pyrogenic Aggregates with Multi-angle DLS 

The multipole functions depend on the specific aggregate configuration and cannot be described universally. However, in the Guinier limit qRg 1) they reduce to  

the dominant multipoles for the Guinier regime are So and S2 and the effective diffusion coefficient can be approximated by  

Considering the general solution for static structure factor in the Guinier regime (1 and approximately assuming proportionality between and the 

This is an important finding with regard to the analysis of experimental DLS data because the scattering at g = 0 is not accessible by experiment so that the parameter Dapp(O) = A has to be derived from extrapolation. 

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