– We study surfactants at the oil/water interface using Dissipative Particle Dynamics simulations at constant μsurfPT . The interfacial tension depends on the surfactant branching in a subtle way. For a given interfacial concentration, a double-tail surfactant is more efficient than its single-tail isomer only if the oil-head repulsion is sufficiently strong. For a given concentration in the bu...

of a dissertation by Ewelina Kalwarczyk A modern, twenty-first-century chemistry, not only continues the research conducted in previous centuries, but also brings together various branches of science and technology. The goal of this approach is usually to create new materials characterized by an interesting combination of physicochemical properties. In my studies, I followed this trend and appl...

Gemini surfactants possess a structure resembling a pair of conventional single chain surfactants covalently connected by a spacer. The spacer can vary in length and chemical structure. In this paper, the aggregation behavior of gemini surfactants is examined on the basis of a free energy model developed by extending our theory for conventional surfactants. Free energy contributions beyond thos...

Fluorinated surfactants are an important class of surfactants because they possess properties that are far superior than those of their hydrocarbon analogs. As a result, they find use in a wide variety of applications including in paints, polishes, fire-fighting foams, and emulsion polymerization. However, concerns regarding the non-biodegradability and toxicity of fluorinated surfactants have ...

Biosurfactants are surface active compounds derived from living organisms, mainly microorganisms. Almost all surfactants currently in use are chemically derived from petroleum. However, in recent years, the interest in chemical surfactants has been substituted by an increase in the use of microbial surfactants. Compared with chemical surfactants, biosurfactants have more advantages, for example...

Osmotically balanced solutions of glucose (0.5--300 mM) and sodium chloride, containing surfactants, were instilled into the small or large intestine of anaesthetized rats. Net absorption or secretion of glucose, sodium and potassium was studied. The surfactants tested were dodecylsulphate (3.4--17 mM), dioctylsulphosuccinate (1.8--11 m/M), Lubrol WX (0.1--5%), Triton X 100 (0.25%) and desoxych...