Name:
Stoyan Karakashev
Country:
Bulgaria
City:
Sofia
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Technical Division Membership Emeritus:
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Career Stage:
Professional
Research and Special Interests:
Dr. Karakashev obtained his undergraduate and postgraduate degrees from the famous school of colloid and surface chemistry founded at Sofia University by Professor Alexei Scheludko. The Ph.D. studies of Dr. Karakashev were under the supervision of Professor Emil Manev, who is a world leading expert in thin liquid films and foam stability. In particular, his Ph.D., carried out at Sofia University, and post-doctoral research, carried out at the University of Newcastle and the University of Queensland, has led to new developments in the area of surfactant adsorption and desorption, and interfacial structures and their effects on the drainage and stability of foams and thin liquid films, which are concerned with in this project. His studies show that the surfactant adsorption controls the behaviour of foam films and foams.
Significant outcomes of Dr. Karakashev"s research include:
• Theoretical development for the antifoaming power of defoamers by considering their participation in the adsorption layer;
• Effect of the inorganic anions on the stability of foams, containing non-ionic surfactants;
• Development of new adsorption model for ionic surfactants with decreased number of free matching parameters;
• Model development and validation of adsorption models for mixed ionic and non-ionic surfactants;
• Proposition of theoretical interpretation of some contradictions appearing in the conventional adsorption lattice theory by the effect of surface layer heterogeneity;
• Development of novel technique for investigation of capillary waves in thinning foam films;
• Introducing the digital filtration method for studying of thin liquid films;
• Development of generalized model for foam film drainage, which focuses on the effect of surface shear viscosity and both DLVO and non-DLVO forces;
• Introducing the combined molecular hydrodynamic model (MHD) into studying the dynamic de-wetting of hydrophobic surfaces in presence of surfactants.
• Introducing the Interferometric technique for fast test of water samples for organic contaminations;
• Discovering of ion-specific effects of inorganic salts in thin foam films;
• Interferometric study on foam and emulsion films with controlled surface shear viscosity by pepfactants.
Area of Expertise:
Thin Liquid Films, Wetting Phenomena, Adsorption Phenomena, Foam drainage and froth stability
Years of Expertise:
6-10