Identification of the dispersion behavior of surface treated nanoscale powders

2020-02-12 22:57:37

size surface oxide treatments agglomerate

责任者: Saltiel, C.;Chen, Q.;Manickavasagam, S.;Schadler, L.S.;Siegel, R.W.;Menguc, M.P. 单位: Synergetic Technol. Inc., Rensselaer, NY, USA 来源出处: Journal of Nanoparticle Research(J. Nanoparticle Res. (Netherlands)),2004/02/,6(1):35-46 摘要: The stability of highly acidic metal oxide surface treatments on rutile titanium dioxide nanopowders (40 nm nominal particle size) is examined. Dispersions are characterized in terms of their sedimentation behavior and light scattering pattern. Using elliptically polarized light scattering (EPLS), agglomerates are identified as fractal structures and size analysis is performed according to the measured fractal dimension. The effect of ultrasonication on agglomerate size and structure (compactness) is quantified for tungsten oxide and molybdenum oxide surface treatments, as well as untreated titanium oxide. Surface treatments are shown to increase dispersion stability, as witnessed by the decreased size of large agglomerates and sedimentation behavior. The EPLS fractal studies, combined with ultrasonication analysis, reveals information of agglomerate shapes, primary particle bonds and structures, and agglomerate growth mechanisms 关键词: disperse systems;molybdenum compounds;nanoparticles;particle size;powders;sedimentation;surface treatment;titanium compounds;tungsten compounds;ultrasonic applications;ultrasonic effects;dispersion behavior;surface treated nanoscale powders;dispersion stability;metal oxide surface treatments;rutile titanium dioxide nanopowders;particle size;sedimentation;light scattering pattern;elliptically polarized light scattering;agglomerate growth mechanisms;fractal structures;fractal dimension;ultrasonication;agglomerate size;compactness;tungsten oxide surface treatments;molybdenum oxide surface treatments;agglomerate shapes;primary particle bonds;TiO2;MoO3;WO3