Single- and Two-Step Emulsification To Prepare a Persistent Multiple Emulsion with a Surfactant-Polymer Mixture

QC 20120201
The regions corresponding to different emulsion morphol. occurrences have been clearly identified on a bidimensional formulation-compn. map. Multiple emulsions spontaneously form when there is a conflict between the formulation and compn. effects. In such systems the most external emulsion is found to be unstable when the formulation effect is produced by a single surfactant. The use of a proper surfactant-polymer mixt. allows one to strongly inhibit the mass transfer and to considerably lengthen the equilibration between interfaces. As a consequence, the multiple emulsion can be stable enough to be used in encapsulation and controlled-release applications. The area where multiple emulsions occur and their characteristics (cond. and amt. of encapsulated external phase) are reported for a system contg. a sorbitan ester lipophilic surfactant and a diblock poly(ethylene oxide)-poly(propylene oxide) hydrophilic polymer, as a function of the formulation and compn., for a single-step process in which a specific amt. of mech. energy (stirring) is supplied. An increase in the oil viscosity is found to alter the map and to modify the multiple emulsion characteristics. The application of the results to emulsion-making technol. is discussed.

NATURVETENSKAP Kemi Fysikalisk kemi hsv//swe
NATURAL SCIENCES Chemical Sciences Physical Chemistry hsv//eng
Chemical engineering design
Electric conductivity
Emulsification
Microstructure
Surfactants
Viscosity (Span 20-Pluronic F68 emulsification in water-kerosene cut/heavy hydrocarbon oil mixts.)
Kerosene Role: PEP (Physical
engineering or chemical process)
PRP (Properties)
PYP (Physical process)
PROC (Process) (Span 20-Pluronic F68 emulsification in water-kerosene cut/heavy hydrocarbon oil mixts.)
Polymers Role: PEP (Physical
engineering or chemical process)
PRP (Properties)
PYP (Physical process)
THU (Therapeutic use)
BIOL (Biological study)
PROC (Process)
USES (Uses) (block
diblock
Span 20-Pluronic F68 emulsification in water-kerosene cut/heavy hydrocarbon oil mixts.)
Hydrocarbon oils Role: PEP (Physical
engineering or chemical process)
PRP (Properties)
PYP (Physical process)
PROC (Process) (heavy
Span 20-Pluronic F68 emulsification in water-kerosene cut/heavy hydrocarbon oil mixts.)
Mixing (stirring
Span 20-Pluronic F68 emulsification in water-kerosene cut/heavy hydrocarbon oil mixts.)
Span20 PluronicF68 emulsification water kerosene hydrocarbon oil mixt

Tyrode, EricFIRP Laboratory, Universidad de Los Andes, Mérida(Swepub:kth)u1pwyse4 (author)
Sadtler, Veronique (author)
Choplin, Lionel (author)
Salager, Jean-Louis (author)
FIRP Laboratory, Universidad de Los Andes, Mérida (creator_code:org_t)

In:Industrial & Engineering Chemistry Research: American Chemical Society (ACS)42:17, s. 3982-39880888-58851520-5045

By the author/editor: Allouche, Joachi ...; Tyrode, Eric; Sadtler, Veroniq ...; Choplin, Lionel; Salager, Jean-Lo ...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Physical Chemist ...

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