title: Reversible loading and unloading of nanoparticles in "exponentially" growing polyelectrolyte LBL films.
abstract: The exponentially growing layer-by-layer (LBL) films made from poly(diallyldimethylammonium chloride) (PDDA) and poly(acrylic acid) (PAA) were used to load and unload the CdTe nanoparticles (NPs). The reversible loading of NPs were investigated through UV-vis studies and further confirmed by confocal microscopy. In addition the LBL films were also compared for the release kinetics for pH 9 and 7 and films capped with (PDDA-PSS)10 layers. The amount of released particles at pH 9 was found to be at least 2 orders of magnitude higher than those at pH 7 and with (PDDA-PSS)10 capped layers after 25 h. This variation in film response for CdTe-particle release presents a route for studies in which highly swollen exponentially growing LBL films can be loaded with functionalized NPs for biological applications and explored as carriers to hold the NPs inside the films for self-assembly.
authors.affiliation: Departments of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA.
authors.forename: Sudhanshu
authors.initials: S
authors.lastname: Srivastava
authors.forename: Vincent
authors.initials: V
authors.lastname: Ball
authors.forename: Paul
authors.initials: P
authors.lastname: Podsiadlo
authors.forename: Jungwoo
authors.initials: J
authors.lastname: Lee
authors.forename: Peter
authors.initials: P
authors.lastname: Ho
authors.forename: Nicholas A
authors.initials: NA
authors.lastname: Kotov
mesh_terms: D000180:Acrylic Resins / Q000138:chemical synthesis / Q000737:chemistry*; D000327:Adsorption; D004573:Electrolytes / Q000737:chemistry; D008567:Membranes, Artificial; D053758:Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D011095:Polyethylenes / Q000138:chemical synthesis / Q000737:chemistry*; D000644:Quaternary Ammonium Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D000180:Acrylic Resins; D004573:Electrolytes; D008567:Membranes, Artificial; D011095:Polyethylenes; D000644:Quaternary Ammonium Compounds; C041004:poly-N,N-dimethyl-N,N-diallylammonium chloride; C006903:carbopol 940