title: Metal-ion adsorption on carboxyl-bearing self-assembled monolayers covalently bound to magnetic nanoparticles.
abstract: Hematite nanoparticles have been functionalized with a self-assembled monolayer of undecanoic acid (UA) by covalent attachment via siloxane groups. The number density of carboxylic/carboxylate groups on the surface was determined by titration, yielding values on the order of 10(14) UA molecules/cm(2) and thus consistent with a closed-packed monolayer. The ability of these functionalized particles to adsorb Cd(2+) in the ppm range was demonstrated using in situ anodic stripping voltammetry.
authors.affiliation: Department of Chemistry, Case Western Reserve University, Cleveland, Ohio 44106-7078, USA.
authors.forename: Bin
authors.initials: B
authors.lastname: Hai
authors.forename: Jun
authors.initials: J
authors.lastname: Wu
authors.forename: Xufang
authors.initials: X
authors.lastname: Chen
authors.forename: John D
authors.initials: JD
authors.lastname: Protasiewicz
authors.forename: Daniel A
authors.initials: DA
authors.lastname: Scherson
mesh_terms: D000327:Adsorption; D007477:Ions / Q000737:chemistry; D008280:Magnetics; D008670:Metals / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D013057:Spectrum Analysis; D013696:Temperature; D017186:Titrimetry
chemical_list: D007477:Ions; D008670:Metals