Thickness and density profiles of polyelectrolyte brushes: dependence on grafting density and salt concentration.
We have performed neutron reflectivity measurements on a monolayer of charged diblock copolymers in a Langmuir trough, and determined precise density profiles of the polyelectrolyte brush at different densities. We obtain profiles in good agreement with existing self-consistent field computations, both for the osmotic and the salted brush regime. We show that the osmotic brush's thickness increases with density.
Romet-Lemonne
G
G
Service de Physique de l'Etat Condensé, Orme des Merisiers, CEA Saclay, F-91191 Gif-sur-Yvette Cedex, France.
Daillant
J
J
Guenoun
P
P
Yang
J
J
Mays
J W
JW
D040761:Biomimetic Materials / Q000737:chemistry; D003102:Colloids / Q000737:chemistry; D002523:Edible Grain / Q000737:chemistry; D004573:Electrolytes / Q000737:chemistry*; D005427:Flocculation; D009502:Neutrons; D011137:Polystyrenes / Q000737:chemistry*; D012542:Scattering, Radiation; D013499:Surface Properties
D003102:Colloids; D004573:Electrolytes; D011137:Polystyrenes; C003321:polystyrene sulfonic acid