  The interfacial tension between immiscible liquids is studied as a function
of a model linear surfactant length and concentration using coarse grained,
dissipative particle dynamics numerical simulations. The adsorption isotherms
obtained from the simulations are found to be in agreement with Langmuir model.
The reduction of the interfacial tension with increasing surfactant
concentration is found to display some common characteristics for all the
values of chain length modeled, with our predictions being in agreement with
Szyszkowski equation. Lastly, the critical micelle concentration is predicted
for all surfactant lengths, finding exponentially decaying behavior, in
agreement with Kleven model. It is argued that these findings can be helpful
guiding tools in the interpretation of available experiments and in the design
of new ones with new surfactants and polymers.
