title: Design and characterization of biofunctional magnetic porous silicon flakes.
abstract: Magnetic porous silicon flakes (MPSF) were obtained from mesoporous silicon layers formed by multi-step anodization and subsequent composite formation with Fe oxide nanoparticles by thermal annealing. The magnetic nanoparticles adhered to the surface and penetrated inside the pores. Their structure evolved as a result of the annealing treatments derived from X-ray diffraction and X-ray absorption analyses. Moreover, by tailoring the magnetic load, the dynamic and hydrodynamic properties of the particles were controlled, as observed by the pressure displayed against a sensor probe. Preliminary functionality experiments were performed using an eye model, seeking potential use of MPSF as reinforcement for restored detached retina. It was observed that optimal flake immobilization is obtained when the MPSF reach values of magnetic saturation >10(-4)Am(2)g(-1). Furthermore, the MPSF were demonstrated to be preliminarily biocompatible in vitro. Moreover, New Zealand rabbit in vivo models demonstrated their short-term histocompatibility and their magnetic functionality as retina pressure actuators.
authors.affiliation: Departamento de Física Aplicada, Universidad Autónoma de Madrid, Madrid, Spain. alvaro.munnoz@uam.es
authors.forename: A
authors.initials: A
authors.lastname: Muñoz Noval
authors.forename: R
authors.initials: R
authors.lastname: García
authors.forename: D
authors.initials: D
authors.lastname: Ruiz Casas
authors.forename: D
authors.initials: D
authors.lastname: Losada Bayo
authors.forename: V
authors.initials: V
authors.lastname: Sánchez Vaquero
authors.forename: V
authors.initials: V
authors.lastname: Torres Costa
authors.forename: R J
authors.initials: RJ
authors.lastname: Martín Palma
authors.forename: M A
authors.initials: MA
authors.lastname: García
authors.forename: J P
authors.initials: JP
authors.lastname: García Ruiz
authors.forename: J J
authors.initials: JJ
authors.lastname: Serrano Olmedo
authors.forename: J F
authors.initials: JF
authors.lastname: Muñoz Negrete
authors.forename: F
authors.initials: F
authors.lastname: del Pozo Guerrero
authors.forename: M
authors.initials: M
authors.lastname: Manso Silván
mesh_terms: D000818:Animals; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006361:Heating; D007429:Intraocular Pressure / Q000502:physiology*; D060526:Magnetic Fields; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D016062:Porosity; D011817:Rabbits; D012160:Retina / Q000502:physiology*; D012825:Silicon / Q000737:chemistry*; D014160:Transducers, Pressure
chemical_list: D058185:Magnetite Nanoparticles; D012825:Silicon