TECHICAL Series MATHEMATICS • INFORMATICS • PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
Study of the Diluted Polydispersed Double Emulsions Stability
(*?Dunărea de Jos? University of Galaţi, 111 str. Domneasca, 800201 Galaţi e-mail: cstoian@ugal.ro **University of Bucharest, 4-12 Regina Elisabeta blvd, Bucharest ***Institute of Physical Chemistry "I.G. Murgulescu", 202 Spl. Independenţei, Bucharest)
Vol LX • No. 4/2008
Cristina Stoian*, Gheorghe Zgherea*, Mihaela Olteanu**, Sandu Peretz***
*?Dunărea de Jos? University of Galaţi, 111 str. Domneasca, 800201 Galaţi
e-mail: cstoian@ugal.ro
**University of Bucharest, 4-12 Regina Elisabeta blvd, Bucharest
***Institute of Physical Chemistry "I.G. Murgulescu", 202 Spl. Independenţei, Bucharest

 Keywords   kinetic release, double emulsion

 Abstract
The goal of this work consists of studying stability of polydispersed double emulsions. In the experiments performed, the reverse emulsion corpuscles were diluted in the aqueous phase ( ≤ 30%v.). The kinetic evolution of Span 80 / SDS (lipophilic surfactant / hydrophilic surfactant) - type double emulsions was traced by using a NaCl solution as internal aqueous phase and a glucose solution, isotonic to the saline one, as external aqueous phase, while the oily phase was toluene. The kinetic evolution of the double emulsions was traced by conductance measurement of the external aqueous phase. It has been ascertained by conductometric method that speeds of the passing at NaCl towards outside increases with added SDS quantity The release experimental values fit well the first order kinetic equation in for SDS concentration bigger than 1 CCM and the naught order for SDS concentration smaller than 1 CCM.

 Rezumat
Scopul acestei lucrărieste de a studia stabilitatea emulsiilor duble polidisperse. În experimentele efectuate globulele de emulsie inversă erau diluate în faza apoasă ( ≤ 30%v.). Evoluţia cinetică a emulsiilor duble de tipul Span 80 /SDS (surfactant lipofil / surfactant hidrofil) a fost trasată folosind o soluţie de NaCl ca fază apoasă internă şi o soluţie de glucoză, izotonică cu soluţia salină, ca fază apoasă externă, în condiţiile în care faza uleioasă o constituia toluenul. Evoluţia cinetică a emulsiilor duble a fost trasată pe baza măsurării conductanţei electrice a fazei apoase externe. Prin metoda conductometrică s-a stabilit că viteza de trecere a NaCl în xterior creşte la mărirea concentraţiei de SDS. Valorile experimentale ale procesului de eliberare a sării urmează o cinetică de ordinul întâi atunci când concentraţia SDS este mai mare decât 1 CCM şi o cinetică de ordinul zero când concentraţia SDS este mai mică decât 1 CCM.



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