Abstract
The interaction of polycaprolactone (PCL) with droplets of a microemulsion is studied with quasielastic light scattering and small angle X-ray scattering At constant droplet size we vary the PCL concentration and there is clear evidence for an increasing attractive interaction of the droplets from structural investigations with small-angle X-ray scattering (SAXS). The collective diffusion coefficient (Dc) of the droplets is monitored with quasielastic light scattering (QELS). We mainly focus on the variation of the dynamic behavior as a function of the PCL concentration and length scale (M.W. = 5000 and 10000) in microemulsion. With increasing PCL concentration and length scale the dynamics of the system slow down. A hard sphere model with depletion potential can fit well the SAXS experiment of microemulsion mixed with PCL. The results show with increase of PCL on microemulsion the size of droplets is constant at 83Å but the size ratio of polymer to droplets is changing.
Highlights
Quasielastic light scattering is a very useful method to characterize the structure of microemulsion, polymers, and nanoparticles in solution [1,2,3,4,5,6,7,8,9].If the scattering particles of solutions are moving, fluctuations in the scattered intensity with time are directly reflecting the so-called Brownian particle motion of the scattering particles
We study the effect of concentration and length scale of polycaprolactone (PCL) on droplets of C12E5/water/decane by quasielastic light scattering (QELS) and small angel X-ray scattering (SAXS)
The microemulsion was prepared by weight, in terms of surfactant-oil mass ratio of 1.08 and the mass fraction of droplets (mf,drop =/(mTotal)), which varies by the respective mass of n-decane, C12E5, and total sample mass
Summary
If the scattering particles of solutions are moving, fluctuations in the scattered intensity with time are directly reflecting the so-called Brownian particle motion of the scattering particles (caused by thermal density fluctuations of the solvent). This is the case because of a change in the interference pattern with changing interparticle position, and correspondingly a change in the detected scattered intensity were measured at a given scattering angle [10,11,12,13,14,15,16]. The depletion was observed in several polymer/microemulsion mixtures [20]
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