Complex coacervation, a liquid-liquid phase separation that occurs when two oppositely charged polyelectrolytes are mixed in a solution, has the potential to be exploited for many emerging applications including wet adhesives and drug delivery vehicles. The ultra-low interfacial tension of coacervate systems against water is critical for such applications, and it would be advantageous if molecu...

2014 We describe a method for the measurement of interfacial tensions in the millidyne/cm range by measuring the diffuse part of the total internally reflected light produced when the interfaces are illuminated close to the critical angle. This method has been used to measure the optimal interfacial tension in toluene-brine microemulsions in simultaneous equilibrium with the oil and aqueous pha...

in this paper, we studied effect of different parameters including density, viscosity, interfacial tension and solute transfer concentration on phase inversion hold-up. the results showed that change in phase density ratio had no effect on phase inversion hold-up. it also disclosed that the phase viscosity ratio was the most effective parameter affecting phase inversion hold-up and each phase h...

Abstract CotA laccase was successfully expressed from Pichia pastoris . Magnetic reduced graphene oxide (MRGO) nanocomposite synthesized and functionalized with iminodiacetic acid (IDA-NH 2 ), then chelated Cu 2+ for effective immobilization His-tagged laccase. The -chelated MRGO (MRGO-IDA-Cu ) showed 175 mg/g-support adsorption capacity. of MRGO-IDA-Cu nano-hybrid composite confirmed by Raman ...

Abstract In this study, we initially performed interfacial tension (IFT) tests to investigate the potential of using Persian Gulf seawater (PGSW) as smart water with different concentrations NaCl, KCl, MgCl 2 , CaCl and Na SO 4 . Next, for each salt, at concentration where IFT was minimum, conducted contact angle, zeta potential, micromodel flooding tests. The results showed that is minimized i...

Chemical flooding is a very important method to the efficient development of heavy oil reservoir. A clear understanding relationship between emulsification characteristics during chemical and test methods that current used evaluate properties agent can be useful for oilfields oil. In this study, oil–water interfacial tension (IFT) in water (O/W) emulsion (emulsification state, droplet size, vis...

In this paper the pendant drop method to measure interfacial tension between molten polymers is reviewed. A typical pendant drop apparatus is presented. The algorithms used to infer interfacial tension from the geometrical profile of the pendant drop are described in details, in particular a new routine to evaluate correctly the value of the radius at the apex of the drop, necessary to the calc...

A comprehensive model has been developed for calculating the interfacial tension (σ) in liquid−liquid systems with or without electrolyte components. The model consists of an equation for computing the interfacial tension of two-liquidphase nonelectrolyte systems and an expression for the effect of the electrolyte concentration. The dependence of the interfacial tension on the electrolyte conce...

Unlike liquids, for crystalline solids the surface tension is known to be different from the surface energy. However, the same cannot be said conclusively for amorphous materials like soft cross-linked elastomers. To resolve this issue we have introduced here a direct method for measuring solid-liquid interfacial tension by using the curved surface of a solid. In essence, we have used the inner...

Asphaltene precipitation and deposition can occur at both the surface subsurface levels, leading to formation of organic-based scales. also lead changes in petrophysical properties such as wettability, which affects ultimate recovery. is linked fluid composition driven by pressure drawdown temperature variation across reservoir. Thus, asphaltene adversely influence Thermal recovery methods are ...