Simultaneous Adsorption of Poly(Vinylpyrrolidone) and Anionic Hydrocarbon/Fluorocarbon Surfactant from Their Binary Mixtures on Polystyrene Latex

Abstract

Lithium dodecyl sulfate (LiDS)/lithium perfluorooctanesulfonate (LiFOS) and poly(vinylpyrrolidone) (PVP) were simultaneously adsorbed to polystyrene latex particles (PS) with diameter of 261 nm from PVP−LiDS and PVP−LiFOS binary mixed aqueous solutions. The conformation of PVP adsorbed on PS was estimated by using ESR. The thickness of the adsorbed layer was also determined by photon correlation spectroscopy (PCS) after pre-fractionation by sedimentation field-flow fractionation (sedFFF) which removed the aggregates and permitted an accurate PCS-based determination of the thickness of the coating layer. The adsorption of PVP was enhanced in the presence of LiDS at low LiDS concentrations owing to the formation of a surface complex of PVP and LiDS, followed by a decrease at high LiDS concentrations. A similar trend was observed in the PVP−LiFOS system. In both the PVP−LiDS and PVP−LiFOS systems, the conformation of PVP adsorbed was changed remarkably from loops and tails to trains with the surfactant concentration. The fraction of train segments in the PVP−LiFOS system was greater than that in the PVP−LiDS system, especially in the high surfactant concentration region. The thickness of PVP adsorbed on PS from the binary mixed solutions estimated from PCS decreased with an increase of the surfactant concentration. Thus, the ESR results were well correlated with the thickness of PVP adsorbed obtained from PCS.

Interactions between Surfactants and Particles: Dispersion, Surface Modification, and Adsolubilization

“…Such a mechanism of PVP and SDS adsorption onto alumina is supported by an adsorption kinetics study (72). Furthermore, the conformation change in adsorbed PVP due to simultaneous adsorption of SDS has been estimated using spin-labeled PVP (71,(73)(74)(75).…”

Dynamic fluorescence microscopy as a feasible technique for estimating the diffusion coefficients of small particles in the presence of additives

“…In the present investigation, the additives chosen were two polymers, i.e., PEG and PVP. Both PEG and PVP, together with latex, have been reported on numerous times, and previous results indicate an interaction between polystyrene latex and PVP [31,32]. Polystyrene latex and PEG should not show interaction at low concentrations of PEG [33].…”

Kinetics of Simultaneous Adsorption of Poly(vinylpyrrolidone) and Sodium Dodecyl Sulfate on Alumina Particles

“…In addition, we have obtained 1 To whom correspondence should be addressed. a good correlation between the conformation of PVP adsorbed estimated by ESR and the thickness of the polymer layer obtained from photon correlation spectroscopy in the presence of surfactant using polystyrene latex particles (5). The information obtained has often helped us to understand the mechanisms of dispersion and flocculation of solid particles.…”