We have proposed that changes in crystal lattice when neodymium enters into Ce 4+ sites enhance the NIR reflectance by about 9% as against the entry of praseodymium. The oxide has been well characterized and its performance as a pigment evaluated. Incorporation of rare earth metal ions was found to enhance the NIR reflectance by 10%, when compared to a conventional cobalt aluminate pigment. The pigment was found to have potential applications as a cool blue colorant, owing to changes in optical properties arising out of crystal chemistry changes. Nanocrystalline cobalt aluminate (CoAl 2 O 4) was prepared by novel solgel method using aluminum nitrate, copper nitrate and lactose without adding external surfactant.Moreover, lactose plays role as capping agent, reducing agent, and chelate agent in the synthesis CoAl 2 O 4 nanoparticles. sintering 21 a later study reported stable performance over 200 cycles.22 In addition, cobalt has been shown, using in situ X-ray photoelectron spectroscopy, to promote reduction at the cobalt-iron aluminate surface,23 thereby increasing the thermodynamic driving force for subsequent oxidation. The molar ratio as estimated by EDX was found to be Al : Cu : Co : Ce : Nd : O= 2 : 0.06 : 0.06 : 0.012 : 0.000 12 : 6.18. ![]() CIELAB color measurements and calculation of Δ E indicated that the Nd doped sample had crystal size of (36☑) nm, bandgap value of (2.4☐.2) eV and color coordinates similar to that of cobalt aluminate. We report for the first time a blue colored cobalt aluminate type pigment prepared through doping of cerium, praseodymium or neodymium. While modulations of substrate, use of white metal oxides as pigments or under-layers has been reported in past, reports on metal oxide or doped metal oxide pigments with high NIR reflectance is scarce. ![]() The last layer is the sealing layer, which only sticks to the pulp and does not scatter sand. After drying for 24 h, the back layer is coated with seven layers, which are dried for 8 h. Increasing energy cost calls for exterior coatings with high near infra-red reflectance, so as to reduce heat absorption and in turn cost of air-conditioning. The shell is coated on a wax pattern with a size of 40 mm × 10 mm × 10 mm, and the primary layer is coated with a layer. Pigment Blue 28 (Cobalt Aluminate Blue Spinel) CAS NO: ,USD,10/Kilogram,cas No:,Formula:CoOAl2O3, Purity 99.3 - Crovell Biotech (Hebei).
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