Abstract
We study collective diffusion coefficient (Dc) of Water-in-oil nanoemulsions (L2 phase) stabilized by AOT and dispersed in n-Decane oils by dynamic light scattering (DLS). At constant water concentration we vary the oil concentration and there is clear evidence for a changing collective diffusion coefficient of the droplets in AOT nanoemuslion. The collective diffusion coefficient in AOT nanoemulsions is studied from relaxation investigations with dynamic light scattering. Also, we study the collective diffusion coefficient (Dc) of droplets with add the TBAC to the droplets of AOT nanoemulsion. We discuss the results with study structural investigations with small-angle x-ray scattering. The results of this study suggest that the formation of non-spherical aggregates at low concentration of droplets can describe the behavior of the collective diffusion coefficient at AOT nanoemulsion.
Highlights
Brownian motion is a subject of renewed interest since the development of photon correlation spectroscopy (PCS) in the last decade
The results of this study suggest that the formation of non-spherical aggregates at low concentration of droplets can describe the behavior of the collective diffusion coefficient at AOT nanoemulsion
From analyzing of the light scattering experiments, we found the collective diffusion coefficient of the system decreases with increasing droplet mass fraction, which is in contrary with the C12E5/H2O/Decane microemulsion behavior
Summary
Brownian motion is a subject of renewed interest since the development of photon correlation spectroscopy (PCS) in the last decade. The dynamic properties of microemulsions and colloidal systems is studied by measuring the relaxation of concentration fluctuations, [1,2]. The relaxation time of the fluctuations can be expressed in a diffusion coefficient, which is called the collective diffusion coefficient (Dc), in the limit of infinite dilution. The study of the collective diffusion coefficient of microemulsion is an interesting topic in soft matter physics. The microemulsions are thermodynamically stable mixtures of water, oil, and surfactant with nano-metric size of droplets to the solvents (H2O or Oil). In the case of water/surfactants (droplet) to the nanopolar solvents (oil), microemulsions have L2 phase and oil/surfactant inside the water solutions is L1 phase of microemulsions. The composition of each system is determined by the molar ratio X of water to surfactant molecules
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