title: Synthesis, characterization and color performance of novel Co²+-doped alumina/titania nanoceramic pigments.
abstract: Blue-green nanoceramic pigments from Co(2+)-doped alumina-titania (xCo(2+)-Al(2)O(3)/TiO(2)) have been synthesized by alkoxide sol-gel route from a mixture of titania and boehmite sols that derived from titanium isopropoxide and aluminum nitrate precursors. The composition of the alumina/titania (AT) matrix is 3:1M ratio. A series of xCo(2+):3TiO(2):1Al(2)O(3) mixed oxides with different Co(2+)-dopant ion concentration has been prepared. The molar ratio of the Co(2+)-dopant ion in the Al(2)O(3)/TiO(2) matrix is from x=0 to 0.5M ratio relative to the titania composition. Characterizations of Co(2+)-doped alumina/titania nanocomposites are carried out using reflectance spectroscopy, transmission electron microscope (TEM), scanning electron microscopy (SEM-EDS), thermo-gravimetric analysis (TGA) and X-ray diffractometer (XRD). The experimental results demonstrated that the prepared Co(2+)-doped alumina-titania nanocomposites fulfill the current technological requirements for ceramic pigment applications that exhibit a high physico-chemical and thermal stabilities at high firing temperatures.
authors.affiliation: Nano-Photochemistry Laboratory, Environmental Studies and Research Institute, Minufiya University, Sadat City, Six zone/n, 32897 Minofiya, Egypt. hoda_hafez2@yahoo.com
authors.forename: Hoda S
authors.initials: HS
authors.lastname: Hafez
authors.forename: E
authors.initials: E
authors.lastname: El-Fadaly
mesh_terms: D000537:Aluminum Oxide / Q000138:chemical synthesis* / Q000737:chemistry*; D002152:Calorimetry, Differential Scanning; D002516:Ceramics / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry*; D003116:Color; D003460:Crystallization; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D013052:Spectrometry, X-Ray Emission; D013696:Temperature; D013818:Thermogravimetry; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: C009495:titanium dioxide; D003035:Cobalt; D014025:Titanium; D000537:Aluminum Oxide