title: Dissolution control of Mg by cellulose acetate-polyelectrolyte membranes.
abstract: Cellulose acetate (CA)-based membranes are used for Mg dissolution control: the permeability of the membrane is adjusted by additions of the polyelectrolyte, poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA). Spin-coated films were characterized with FT-IR, and once exposed to an aqueous solution the film distends and starts acting as a membrane which controls the flow of ions and H2 gas. Electrochemical measurements (linear sweep voltammograms, open-circuit potential, and polarization) show that by altering the CA:PDMAEMA ratio the dissolution rate of Mg can be controlled. Such a control over Mg dissolution is crucial if Mg is to be considered as a viable, temporary biomedical implant material. Furthermore, the accumulation of corrosion products between the membrane and the sample diminishes the undesirable effects of high local pH and H2 formation which takes place during the corrosion process.
authors.affiliation: Department of Chemistry, Aalto University School of Chemical Technology , P.O. Box 16100, FI-00076 AALTO, Finland.
authors.forename: Kirsi
authors.initials: K
authors.lastname: Yliniemi
authors.forename: Benjamin P
authors.initials: BP
authors.lastname: Wilson
authors.forename: Ferdinand
authors.initials: F
authors.lastname: Singer
authors.forename: Sarah
authors.initials: S
authors.lastname: Höhn
authors.forename: Eero
authors.initials: E
authors.lastname: Kontturi
authors.forename: Sannakaisa
authors.initials: S
authors.lastname: Virtanen
mesh_terms: D001826:Body Fluids / Q000737:chemistry*; D002482:Cellulose / Q000031:analogs & derivatives* / Q000737:chemistry; D020099:Coated Materials, Biocompatible / Q000138:chemical synthesis*; D003343:Corrosion; D004058:Diffusion; D004573:Electrolytes / Q000737:chemistry; D008274:Magnesium / Q000737:chemistry*; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry*; D009757:Nylons / Q000737:chemistry*
chemical_list: D020099:Coated Materials, Biocompatible; D004573:Electrolytes; D008689:Methacrylates; D009757:Nylons; C407037:poly(2-(dimethylamino)ethyl methacrylate); C005062:acetylcellulose; D002482:Cellulose; D008274:Magnesium
keywords: controlled dissolution; implant material; magnesium; spin coating