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Vol 486, No 2 (2019)
- Year: 2019
- Articles: 3
- URL: https://journals.rcsi.science/0012-5016/issue/view/9265
Physical Chemistry
On the Digestive Ripening Mechanism
Abstract
The literature describes a relatively new method of regulating the size distribution function of nanoparticles, namely, the process of digestive ripening, which, unlike the Ostwald ripening, implies the dissolution of large nanoparticles and the formation of small ones. However, there is still no reasonable explanation of this phenomenon. The work substantiates the mechanism of the process, based on taking into account the dependence of the critical radius of the nanoparticle on the concentration of monomeric units and the size of the ligand layer.
77-79
Increasing the Strength Properties of Aluminum Powder Materials by Additions of Magnesia Nanoparticles
Abstract
New data were obtained on the effect of small additions of magnesia nanoparticles on the mechanical properties of aluminum. Composite specimens were produced by cold pressing of aluminum powders with or without copper added with subsequent sintering in a forevacuum. As a result, a significant increase was detected in the strength properties of materials modified by magnesia nanoparticles, namely, in tensile, compressive, flexural, and offset yield strengths.
80-82
Analysis of the Physicochemical Efficiency of the Electroflotation Recovery of Titanium Tetrachloride Hydrolysis Products from Industrial Waste
Abstract
The physicochemical efficiency was studied for the electroflotation recovery of TiCl4 hydrolysis products from aqueous solutions of electrolytes, which modeled industrial waste of metallurgical production. The effect of surfactants of various natures on the efficiency of the electroflotation recovery of dispersed titanium(IV) compounds was experimentally investigated over a wide pH range. It was determined that the electroflotation recovery of TiCl4 hydrolysis products is quite efficient, with the maximum degree of recovery being 98–99%.
83-86