Adsorption Kinetics of Amphipathic Polystyrene-block-polybutadiene onto Silicon Wafer and Polystyrene Planar Surfaces

Abstract

Adsorption kinetics of amphipathic diblock AB copolymers of polystyrene-block-polybutadiene from selective solvent onto planar silicon wafer and polystyrene surfaces have been studied by ellipsometry. A theoretical analysis of the adsorption kinetics was applied to investigate the adsorbed layer thickness, the total amount adsorbed at each concentration, and the area occupied by each copolymer chain. Some insight into the architecture of the buoy in the solution is presented. In these studies we found a strong dependence of adsorption rate on the chemical nature of the substrates and on the bulk concentration of the adsorbent. Further, the kinetics of adsorption at different concentrations and temperatures suggest that both single polymer molecules and micelles are responsible for adsorption.

Adsorption characteristics of zwitterionic diblock copolymers at the silica/aqueous solution interface

“…The second possibility is direct adsorption of diblock copolymer micelles, as reported in previous literature reports [43][44][45][46]. If adsorption proceeds by this mechanism, there must be an attractive interaction between the core-forming chains and the solid surface that overcomes the strong electrostatic repulsion between the anionic PMAA coronal chains and the anionic silica surface; this does not seem likely and implies the direct unimer adsorption mechanism.…”

A biophysical perspective of understanding nanoparticles at large

“…This adsorption of plastic on algae was found to ubiquitously favor positively charged PS beads, possibly due to the weakly negative charge of the cellulose constituent of the organism. The binding with the PS beads also depended upon algal morphology and motility, as indicated by the Freundlich coefficients 101,102 for both single-celled algal species Chlorella and multi-celled algal species Scenedesmus (Fig. 8c).…”

Solution Properties of Diblock Copolymers of Polystyrene-block-polybutadiene

“…These results are discussed in terms which can help to elucidate the mechanism of particle nucleation in anionic dispersion polymerization and the mechanism of stabilizer adsorption. 26 DLS was used to investigate the micellar size, the size distribution, and the change in the micelle size with concentration of diblock copolymer in hexane. SLS was applied to determine the net number of polymer chains per micelle, the apparent molar mass of the micelle (M w,app ), and the apparent radius of gyration (R g ).…”