Influence of a CO-switchable additive on the surface and foaming properties of a cationic non-switchable surfactant.

Switchable materials in general and CO-switchable materials in particular are of great interest in environmental research. The replacement of common non-switchable materials (solutions, solvents, surfactants, ) with their switchable counterparts has a great potential to make processes more environmentally friendly by enhancing reusability and circularity and thus reducing energy costs and material consumption. Inspired by this, the present work deals with the surface and foaming properties of aqueous solutions of a non-switchable surfactant in presence of a CO-switchable additive.

Basic principles and problems in decontamination of natural disperse systems. The electrokinetic treatment of soils.

The main chemical, biological and physical methods of deactivation of such natural disperse systems as soils and bottom sediments from charged and uncharged pollutants are analyzed. The impact of properties of natural disperse systems and the substances causing their contamination on the expediency of using some specific detoxication method is considered. The peculiarities of ex-situ and in-situ treatment are indicated.

A Multistate Adsorption Model for the Characterization of CDMPO Adsorption Layers at the Aqueous Solution/Air Interface.

Experimental data for tridecyl dimethyl phosphine oxide (CDMPO) adsorption layers at the water/air interface, including equilibrium surface tension and surface dilational viscoelasticity, are measured by bubble and drop profile analysis tensiometry at different solution concentrations and surface area oscillation frequencies. The results are used to assess the applicability of a multistate model with more than two possible adsorption states. For the experiments with single drops, the depletion of surfactant molecules due to adsorption at the drop surface is taken into account.

"TO AND FRO" BLOOD FLOW MATHEMATICAL MODEL IN VENOUS FLAP SURVIVAL.

Objective: The aim of the research is to determine "to and fro" venous flap blood circulation perfusion ability and flap size survival.

Patients And Methods: Materials and methods: "To and fro" blood circulation mathematical model based on the theory of compressed liquid flow thought the porous medium.

Results: Result: Designed mathematical model allows to calculate the viable flap size that depends on pedicle vessel radius, the blood pressure gradient, the blood viscosity, the elastic tissue capacity, the pulse frequency, vessels flap topography and surgical pedicle flap technique.

Dilational Viscoelasticity of Proteins Solutions in Dynamic Conditions.

Drop profile analysis tensiometry used in the oscillating drop mode provides the dilational viscoelasticity of adsorption layers at liquid interfaces. Applied during the progress of adsorption the dynamic surface rheology can be monitored. For β-casein solutions at the same surface pressure values, the larger the dynamic dilational viscoelasticity the longer the adsorption time, i.

Mechano-chemical effects in weakly charged porous media.

The paper is concerned with mechano-chemical effects, namely, osmosis and pressure-driven separation of ions that can be observed when a charged porous medium is placed between two electrolyte solutions. The study is focused on porous systems with low equilibrium interfacial potentials (about 30 mV or lower). At such low potentials, osmosis and pressure-driven separation of ions noticeably manifest themselves provided that the ions in the electrolyte solutions have different diffusion coefficients.