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Influence of Drop Deformability on the Stability of Decane‐in‐Water Emulsions
Author(s) -
Osorio Paola,
UrbinaVillalba German
Publication year - 2011
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-010-1238-z
Subject(s) - decane , chemistry , pulmonary surfactant , emulsion , monolayer , drop (telecommunication) , chemical engineering , sodium , modulus , composite material , organic chemistry , materials science , telecommunications , biochemistry , computer science , engineering
Emulsion stability simulations of nondeformable and deformable droplets are used to justify the change in the number of aggregates as a function of time shown by (decane + CCl 4 )/water emulsions stabilized with either sodium di‐octyl‐sulfosuccinate (DOSS) or sodium oleate (NaOl). It is found that the results of the simulations depend sensitively on the value of the bending modulus B 0 of the surfactant monolayer. The experimental data of DOSS and NaOl emulsions can only be accurately reproduced by assuming the occurrence of deformable droplets in both cases, along with a significant variation of B 0 as a function of the salt concentration [NaCl]. Otherwise only reasonable agreement is found. In the second scenario, the rates predicted by the simulations of nondeformable droplets are closer to the experimental values of the emulsions stabilized with [NaOl] = 0.5 mM, [NaOl] = 1.0 mM, and [DOSS] = 0.42 mM. Conversely, the rates predicted by the simulations of deformable droplets are closer to the experimental data of the system containing [NaOl] = 2.0 mM.