Patent ID: 7813882
Filing Date: 2010-10-12
Classification: G01N

Abstract:
1. A method to determine the average molecular properties of a solution of molecules in a solvent, said average molecular properties being the weight average molar mass M, the mean square radius <r g 2 >, the 2 nd virial coefficient A 2 , and the 3 rd virial coefficient A 3 , comprising the steps of A. providing a reservoir of said solvent; B. providing a reservoir of said solution; C. preparing from said reservoirs a series of n dilutions D D. providing sampling means by which said dilutions D E. generating from the measured scattered light intensities and the corresponding concentration c F. calculating the n concentration sums  corresponding to each said dilution D G. calculating the 3qn excess Rayleigh ratios sums,  corresponding to said n dilutions, from said generated excess Rayleigh ratios R*(θ H. extracting said average molecular properties of said solution of molecules from said 3qn excess Rayleigh ratios sums by fitting the collected concentration values and generated excess Rayleigh ratio values with an appropriate equation relating said concentration sums and said excess Rayleigh ratio sums with variables representative of said average molecular properties of said solution of molecules as the parameters of the fit.