Asymmetric water-oil-amphiphile mixtures: Lamellar phases and droplet microemulsions

Abstract

Articles you may be interested inMicellar interactions in water-AOT based droplet microemulsions containing hydrophilic and amphiphilic polymers Monte Carlo cluster algorithm for fluid phase transitions in highly size-asymmetrical binary mixtures Phase behavior and structure of star-polymer-colloid mixtures A continuum microscopic model for symmetric amphiphilic mixtures, is generalized by considering explicitly water-oil asymmetry, through the interactions between amphiphiles and water and oil. The phase diagram, including lamellar phases, and the properties of water-oil interfaces are studied, using an approximate free energy density-functional, for a wide range of amphiphilic interactions. We also consider the structure and stability of spherical micelles and study the dilute micellar regime. By combining the microscopic density-functional description with the phenomenologic Helfrich elastic free energy, we calculate the elastic properties of the amphiphilic film. Our results for the elastic constant, k s ϭ2kϩk , are compared with experimental data.

Ordering of amphiphilic Janus particles at planar walls: A density functional study

“…Generally, Janus particles are composed of at least two physically (or chemically) distinctive surfaces, and there has been significant progress to synthesize such particles [18][19][20][21] (whose interactions can also be, e.g., dipolar or magnetic in character [22][23][24][25] ). Theoretically there are several models "on the market" which are similar in character to that proposed by Tarazona et al 15 , but have been independently proposed specifically for Janus particles 19,26,27 . Furthermore, in a recent study of Sciortino et al 28 Janus particles are described within a "patchy-particle" model.…”

Simulating the effect of surfactant structure on bending moduli of monolayers

“…Our results are in accordance with theory at similar conditions. 17,38 It is interesting to make a more detailed comparison with the experimental data. A tail bead in our model represents approximately three CH 2 groups.…”

Metastable liquid lamellar structures in binary and ternary mixtures of Lennard-Jones fluids

“…A few examples where a better understanding of these phenomena may have impact are, in the design, operation and optimization of the extraction processes, in tertiary oil recovery, in the adsorption or coating processes, in biological processes, etc. Different analytical approaches [1,2,3,4], and density functional theory implementations [5,6,7], as well as numerical simulations [8,9,10,11,12,13,14] have been used to investigate these issues in simple fluids and in more complex systems [15,16,17,18]. Binary mixtures of LJ fluids have been investigated with the aim at understanding the phase coexistence as well as the interfacial and structural properties of the LV and LL interfaces.…”