Abstract
Poly(styrenesulfonate) (PSS) was adsorbed reversibly from aqueous CsCl or NaCl solutions onto oppositely charged DODAB (diocatadecyldimethylammonium bromide) monolayers at the water surface. By adjusting the DODAB lateral density, the surface charge of the liquid interface is varied. The electron density profile of the surface layer was measured with X-ray reflectivity, using counterion contrast. A flat PSS layer is always found, with a thickness corresponding to one to two chain diameters. At low surface charge, the PSS coverage is constant and large, presumably due to hydrophobic attraction. A surface charge overcompensation of up to 6:1 is observed. The PSS coverage increases both with surface charge and with ionic strength. Intriguingly, at high salt (1 M) and low surface charge, beneath the flat concentrated PSS layer a diffuse extended adsorption layer is found. Its thickness decreases on increase of the surface charge and disappears at ca. 80 A2 DODAB molecular area, causing a minimum in PSS covera...
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
