Simultaneous Conductivity and Viscosity Measurements as a Technique To Track Emulsion Inversion by the Phase-Inversion-Temperature Method

• Two kinds of transitions can occur when an emulsified water-oil-ethoxylated nonionic surfactant system is cooled under const. stirring. At a water-oil ratio close to unity, a transitional inversion takes place from a water-in-oil (W/O) to an oil-in-water (O/W) morphol. according to the so-called phase-inversion-temp. method. At a high water content, a multiple W/O/W emulsion changes to a simple O/W emulsion. The continuous monitoring of both the emulsion cond. and viscosity allows the identification of several phenomena that take place during the temp. decrease. In all cases, a viscosity max. is found on each side of the three-phase behavior temp. interval and correlates with the attainment of extremely fine emulsions, where the best compromise between a low-tension and a not-too-unstable emulsion is reached. The studied system contains Polysorbate 85, a light alkane cut oil, and a sodium chloride brine. All transitions are interpreted in the framework of the formulation-compn. bidimensional map.

Ämnesord

NATURVETENSKAP  -- Kemi -- Fysikalisk kemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences -- Physical Chemistry (hsv//eng)

Nyckelord

Surfactants (nonionic

simultaneous cond. and viscosity measurements as technique to track emulsion inversion by phase-inversion-temp. method)

Kerosene Role: PRP (Properties) (oil phase contg.

simultaneous cond. and viscosity measurements as technique to track emulsion inversion by phase-inversion-temp. method)

Emulsions

Ionic conductivity

Viscosity (simultaneous cond. and viscosity measurements as technique to track emulsion inversion by phase-inversion-temp. method)

nonionic surfactant emulsion inversion cond viscosity

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)