Dynamic light scattering by rodlike particles:  examination of the vanadium(V)-oxide system
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The dynamics of a suspension of rodlike particles has been investigated using dynamic light scattering. The \(\) sols investigated in this contribution are not monodisperse by nature and age with time. An evaluation of the first cumulant of the autocorrelation functions as a function of scattering vector is expected to yield the dimensions of the particles. While the data can be excellently fitted by the theoretical expressions for freshly prepared sols, we found that the theoretically expected interrelation of the (three) diffusion coefficients is not reproduced, which prohibits the unequivocal determination of the particle dimensions. Aged sols, on the other hand, cannot be described at all within the framework of the theory. While this partially may originate from the temporally increasing polydispersity of the \(\) sol system, other factors like specific growth processes may have influence on our data.
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