Низкая агрегативная устойчивость промышленных нанопорошков в водных растворах ПАВ

Abstract

The effect of the dispersion of aqueous suspensions on the dispersion properties of industrial Al2O3 nanopowders with an average particle size of 50, 140 and 250 nm was investigated. Using ultrasound and/or with the addition of citric and aminoacetic acids (0,5, 5 and 10 g・L-1), it has been shown the low aggregation stability of chosen particles in watering medium. The aggregative stability of the particles increased with decreasing particle size. Regardless of surfactant type and the initial particle size, concentration increase of carboxylic acids under the selected conditions had little effect on the degree of particle dispersion. Reducing the acidity of the medium (from 10 to 3 of pH units) contributed to the enhanced aggregation of nanoparticles.