Entropic, electrostatic, and interfacial regimes in concentrated disordered ionic emulsions

摘要: We develop a free energy model that describes two key thermodynamic properties, the osmotic pressure Π and linear elastic shear modulus G′p (i.e. plateau storage modulus), of concentrated monodisperse emulsions which have isotropic, disordered, droplet structures, are stabilized using ionic surfactants. This effectively incorporates concept random close packing or jamming repulsive spheres into F depends on volume fraction ϕ strain γ both below above critical point ϕ c ≈ 0.646. has three terms: entropic, electrostatic, interfacial (EEI). By minimizing with respect to an average deformation parameter links all terms, we show entropic term is dominant for well c, electrostatic near but dominates larger ϕ. EEI measurements G′p(ϕ) charge-stabilized uniform having wide range sizes, ranging from nanoscale microscale, it also consistent Π(ϕ). Moreover, similar nanoemulsions after adding non-amphiphilic salt, when changes in tension Debye screening length properly taken account. unifying existing approaches, predicts constitutive properties out-of-equilibrium structures through near-equilibrium minimization, driving Brownian excitations.