Jakub Matusiak
ORCID iDDepartment of Radiochemistry and Colloid Chemistry, Faculty of Chemistry, MCS University (UMCS)
Poland

Jakub Matusiakwas born in 1991, Jarosław Poland.  Graduated from Maria Curie-Skłodowska University in Lublin in 2015 receiving an M. Sc. in Chemistry. Since 2015 on Ph. D. studies in Department of Radiochemistry and Colloid Chemistry, MSCU. His research area concerns the stabilization of oxide suspensions by the addition of polysaccharides and surfactants as well as the adsorption of such substances on the solid surface.

Elżbieta Grządka
Department of Radiochemistry and Colloid Chemistry, Faculty of Chemistry, MCS University (UMCS)
Poland

Elżbieta Grządka studied chemistry at Maria Curie-Sklodowska University in Lublin and was graduated in 2002 receiving M.Sc. She received Ph.D. in 2006. In 2007 she was employed at the Department of Radiochemistry and Colloid Chemistry, Faculty of Chemistry. In 2016 she achieved postdoctoral degree. Currently she is employed as the assistant professor and the head of the Department of the Radiochemistry and Colloid Chemistry.

The stability of colloidal systems is very important in numerous already existing and new formulations. In most cases if such systems are not characterized by an appropriate stability they can not find any useful applications. The opposite process to the stabilization is the flocculation. Generally, it is undesirable. However, in a few cases the flocculation is very useful, for example in  the wastewater treatment. That is why the methods used to determine stabilizing-flocculating properties of the colloidal systems are of significant importance.

The paper describes types of stability and flocculation as well as the factors influencing those processes, e.g. the addition of polymers or surfactants. The methods presented in this paper are UV-VIS spectrophotometry,  turbidimetry, zeta potential and density measurements.

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