title: Stretching and collapse of neutral polymer layers under association with ionic surfactants.
abstract: We provide experimental evidence for stretching and collapse of neutral polymer layers, already adsorbed at an oil-in-water interface, due to its interaction with surfactants. Upon stretching, the first interaction length (2L(0)) follows a power law dependence on surfactant concentration ( proportional, variant C(x)(s), where x approximately 0.5 for cationic surfactants) and collapses in the presence of salt, as a relatively weak power law (C(-y)(s), where y=0.17), in good agreement with brush length decay for polyelectrolyte brushes.
authors.affiliation: DPEND, Indira Gandhi Centre for Atomic Research, Kalpakkam-603 102, Tamil Nadu, India. philip@igcar.ernet.in
authors.forename: John
authors.initials: J
authors.lastname: Philip
authors.forename: G Gnana
authors.initials: GG
authors.lastname: Prakash
authors.forename: T
authors.initials: T
authors.lastname: Jaykumar
authors.forename: P
authors.initials: P
authors.lastname: Kalyanasundaram
authors.forename: Baldev
authors.initials: B
authors.lastname: Raj
mesh_terms: D003102:Colloids / Q000737:chemistry; D004548:Elasticity; D007477:Ions / Q000737:chemistry; D011142:Polyvinyl Alcohol / Q000737:chemistry*; D011145:Polyvinyls / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry*; D013816:Thermodynamics
chemical_list: D003102:Colloids; D007477:Ions; D011145:Polyvinyls; D013501:Surface-Active Agents; C013215:polyvinyl acetate; D011142:Polyvinyl Alcohol