Kinetics of adsorption, of polyvinylamine onto cellulose
Geffroy, C. ; Labeau, M.P. ; Wong, K. ; Cabane, B. ; Cohen Stuart, M.A. - \ 2000
Colloids and Surfaces. A: Physicochemical and Engineering Aspects 172 (2000). - ISSN 0927-7757 - p. 47 - 56.
The adsorption kinetics of a cationic polyelectrolyte onto a model negatively charged cellulose surface has been investigated. Two regimes have been distinguished. At low surface coverage, the adsorption is transport-limited while at higher surface coverage the incoming polymer experiences a blocking barrier of electrostatic nature. This barrier has been quantified and the respective roles of the polymer and surface charge have been assessed.
Adsorption of nonionic surfactants onto polystyrene : kinetics and reversibility
Geffroy, C. ; Cohen Stuart, M.A. ; Wong, K. ; Cabane, B. ; Bergeron, V. - \ 2000
Langmuir 16 (2000). - ISSN 0743-7463 - p. 6422 - 6430.
The reversible adsorption and desorption kinetics of nonionic surfactants at a hydrophobic surface have been studied by reflectometry. This enables the measurement of the adsorption isotherm with unprecedented accuracy. It is shown that the adsorption mechanism can be split into three processes. The surface is first covered by single monomers that experience a strong hydrophobic interaction. This is followed by a typically cooperative process leading to the formation of surface aggregates. At the saturation level, the surfactant molecules stagger in the interface such that there is a possible overlap of hydrophilic headgroups with hydrophobic tails. All this information comes directly out of the kinetics that can be modeled in terms of a local equilibrium.
|Cinétique d'adsorption de molécules aux interfaces
Geffroy, C. - \ 1999
Technopol'der 32 (1999). - p. 6 - 6.