A multi-scale method was developed, which utilized intrinsic relationships among zeta potential of particles, rheological properties of suspensions and particle size distribution (PSD), to analyze dispersion behavior of nanoparticles in concentrated suspensions. It was found that PSD of a kind of nanoceria particles by dynamic light scattering (DLS) method in solution A with concentration 5 wt% accorded well with that by direct TEM analysis, which meant the particles had been dispersed well. However, there had a significant difference when the concentration was increased to 20 wt%. When particles concentration increased from 5 wt% to 20 wt%, zeta potential in solution A changed from-150 mV to-100 mV, while zeta potential in solution B changed from-35mV to-45 mV. Variations of zeta potential of particles accorded well with rheological properties of suspensions too, from phenomenological models. When the suspensions composed by solution A and the nanoparticles with concentration about 20 wt% was diluted with its original solution to 5 wt%, the PSD of nanoceria could be measured indirectly, which accorded well with both that of a suspension prepared directly with near concentration and that from TEM images. Then a method to measure PSD of nanoparticles in concentrated suspension was brought forward.
This paper evaluates comprehensively the rutting resistance of polyacrylonitrile fiber asphalt mixture by TRLL, AAPA, CPN wheel rutting test and triaxial shear test. The result shows that polyacrylonitrile fiber asphalt mixture is better than cellulose fiber and normal asphalt mixture in improving rutting resistance with any above method. And these methods have relevance in increasing rutting resistance.
A practical nanopowders dispersion process is designed in order to solve self-cleaning finishing agent reunion.Seven kinds of typical dispersing agent are used for dispersing nanopowders. nanoTiO2-doped ZnO composite powders are chosed as raw material, polysodium acrylate as dispersant, nanopowders are effectively dispersed to get a self-cleaning finishing agent with a uniform dispersion, the average particle size at about 30-40 nm . By orthogonal test, optimum dispersion process conditions were: nanoTiO2 / ZnO powders 1 g / L, polysodium acrylate dispersant 1 g / L, dispersion methods were shear emulsification dispersion method and ultrasonic dispersion method,nanosample stirring time 10min, high shear revolutions 3500r / min, high shearing time 30min, ultrasonic time 5min, ultrasonic power 1 000w.
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