title: Coating zinc oxide submicron crystals on poly(methyl methacrylate) chips and spheres via ultrasound irradiation.
abstract: Ultrasound irradiation is used for anchoring zinc oxide submicron crystals with a main diameter and length of approximately 280 nm and 470 nm, respectively, onto the surface of poly(methyl methacrylate) PMMA chips (2mm diameter), and zinc oxide crystals with a mean diameter and length of approximately 150 nm and 230 nm, respectively, onto the surface of the PMMA spheres (1-10 microm). The zinc oxide crystals were obtained by sonochemical irradiation of a mixture containing the PMMA, zinc (II) acetate dihydrate, ethanol, water, and 24 wt.% aqueous ammonia for 2h, yielding a PMMA-zinc oxide composite. By controlling the atmosphere and reaction conditions, we could achieve well-adhered zinc oxide crystals on the surface of poly(methyl methacrylate). The resulting zinc oxide-PMMA composite was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray analysis (EDX), high-resolution scanning electron microscopy (HRSEM), and photoluminescence (PL) spectroscopy. The zinc oxide-deposited PMMA chips (loaded with 0.03-1.0 wt.% ZnO) were successfully homogenized in melt by extrusion and then injection molded into small, disc-shaped samples. These samples were analyzed with respect to their directional spectral optical properties in UV, Vis and IR spectroscopy.
authors.affiliation: Department of Chemistry and Kanbar Laboratory for Nanomaterials at the Bar-Ilan University, Center for Advanced Materials and Nanotechnology, Bar-Ilan University, Ramat-Gan 52900, Israel.
authors.forename: Kotlyar
authors.initials: K
authors.lastname: Anna
authors.forename: Perkas
authors.initials: P
authors.lastname: Nina
authors.forename: Koltypin
authors.initials: K
authors.lastname: Yuri
authors.forename: Meyer
authors.initials: M
authors.lastname: Meinhard
authors.forename: Zimmermann
authors.initials: Z
authors.lastname: Werner
authors.forename: Gedanken
authors.initials: G
authors.lastname: Aharon