Modeling of the properties of individual colloidal silicon oxide nanoparticles
This article describes interaction between dispersed phase particles in colloidal solution and, particularly, nanoparticles of silicon oxide contained in an electrolyte solution. The proposed theoretical analysis of this interaction develops the DLVO theory. In the frame of the theory it was assumed that silicon oxide nanoparticles in the electrolyte solution are the assembly of the charged particles but, at the same time, they are electrically neutral. It was assumed that charged particle sizes are much smaller in comparison with the distance between them. This paper attempts to describe interaction of colloidal particles in the framework of the point charges model interaction. We suggest a simple model describing interaction of two systems of electric charges placed at arbitrary distances from each other. The conducted analysis of the obtained potential dependencies versus "rigid" colloidal particles revealed presence of three singular points. These points are associated with a qualitative change in the type of particle interaction with each other, which makes it possible to distinguish four types of colloidal particles found in electrolyte solutions. The calculations indicate a possibility of ultrasoft colloidal systems existence with long-range forces of interaction of particles with each other. In such systems formation of long-range hyper structures, in other words, formation of aggregates without short-range interaction between particles is possible. A system of colloidal particles classification is proposed on the basis of analysis of obtained results. A formula that describes viscosity of a colloidal solution depending on the volume part of the disperse phase and the parameter characterizing the law of attraction in the interaction of colloidal particles in case of "rigid" colloidal systems was obtained.
Tags: colloidal solutions dlvo theory electrical double layer potential energy of interacting colloidal nanoparticles viscosity of dispersed systems теория длфо вязкость дисперсных систем двойной электрический слой коллоидные растворы потенциальная энергия взаимодействующих коллоидных наночастиц
Subscribe to the journal Nanoindustry to read the full article.