New Nanostructured Fluorocompounds as UV Absorbers
Language
en
Chapitre d'ouvrage
This item was published in
Functionalized Inorganic Fluorides, Functionalized Inorganic Fluorides. 2010p. 229-271
Wiley
English Abstract
Titanium dioxide (TiO2), zinc oxide (ZnO) and cerium dioxide (CeO2) exhibit optical band gaps at 3.1–3.25 eV, 3.4 eV and 3.2 eV respectively1–6 at the frontier between the UV and the visible range, corresponding to charge ...Read more >
Titanium dioxide (TiO2), zinc oxide (ZnO) and cerium dioxide (CeO2) exhibit optical band gaps at 3.1–3.25 eV, 3.4 eV and 3.2 eV respectively1–6 at the frontier between the UV and the visible range, corresponding to charge transfers O(2p)-M(4s/3d) (M¼Zn/Ti) and O(2p)-Ce(4f/5d). However, they present major drawbacks: (i) they exhibit high photocatalytic activity under UV irradiation or oxidation catalytic activity, leading to thegeneration of reactive oxygen species7–9 that can induce a photodegradation of the organic medium in which they are dispersed (varnish, paint, polymers, etc.);10–11 (ii) the refractive index is high in the visible range, i.e. around 2.75–2.45 for TiO2 12 and CeO2 13 compounds...Read less <
English Keywords
Inorganic compounds
Nanoparticles
UV absorbers
Origin
Hal imported