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Determination of the nanoparticle size distribution in media by turbidimetric measurements

: Guschin, V.; Becker, W.; Eisenreich, N.; Bendfeld, A.


Chemical Engineering and Technology 35 (2012), Nr.2, S.317-322
ISSN: 0930-7516
ISSN: 1521-4125
Fraunhofer ICT ()

For incorporation of nanoparticles into matrices, it is necessary to control the particle size distribution during processing. In this paper, a turbidimetric method was applied that uses spectroscopic data to determine the nanoparticle size distribution and, consequently, to control the material properties with a non-contact measurement method. This method is based on the scattering and absorption of light by the particles. Unlike conventional turbidimetric methods, this method uses not only a few wavelengths but a whole spectral range for evaluation. To determine the distribution parameters, a nonlinear numerical least squares fit routine was established. It was validated by comparing data of water-silica nanosuspensions with the results from the sedimentation method. The results show that this method is an accurate and easy-to-use analysis instrument for the characterization of nanosuspensions, emulsions, and aerosols.