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We prepared cerium oxide nanoparticles having size range of 160 nm by using simple and effective sol-gel process and evaluated its wound healing potential. Quite interestingly we found that 2% nanoceria enhanced wound healing activity to a considerable extent which could be supported by increased amount of Hydroxylproline content (4.7 g/ml), wound tensile strength of 44.88 N/cm 2 and wound closure time, which are quite high when compared to other treated groups. Histopathology also showed no inflammation and increased amount of collagen production in group treated with 2% nanoceria. The prepared nanoparticles were characterized by SEM and XRD. The probable mechanism may be due to the dual oxidation state of cerium oxide which will help in scavenging ROS and reduce oxidative stress locally which is required for wound healing.

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Thin films were grown by vacuum co-evaporation of CsI and PbI 2 compounds from two independent crucibles. X-ray diffraction spectroscopy revealed formation of CsPbI 3 and Cs 4 PbI 6 nanoaggregates in the thin film samples and gave an estimate of their volume percentage as well. It provided also the grain size estimates, which were compared with direct observation of a thin film surface by atomic force microscopy. The absorption, luminescence and decay kinetics characteristics of thin films grown were measured. The optical characteristics of the mentioned ternary nanoaggregates were determined and compared with those of CsPbX 3 and Cs 4 PbX 6 (X = Cl, Br) bulk structures.

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The physical, chemical and mechanical properties of magnesium alloys make them attractive materials for automotive and aerospace applications. However, these materials are susceptible to corrosion and wear. This work discusses the potential of using sol-gel based coatings consisting of ZrO 2 and 15 wt.% of CeO 2 . The CeO 2 component provides enhanced corrosion protection, while ZrO 2 impart corrosion as well as wear resistance. Coating deposition was performed by the dip coating technique on two magnesium alloy substrates with different surface finishes: AZ91D (as-casted, sandblasted, and machined) and AZ31 (rolled and machined). All as-deposited coatings (xerogel coatings) were then subjected to 10 h annealilng: a temperature of 180 8C was applied to the AZ91D alloy and 140 8C to the AZ31 alloy. Morphological and structural properties of the annealed coatings were investigated by scanning electron microscopy, atomic force microscopy and transmission electron microscopy. Coating composition was examined using energy dispersive X-ray analysis. Adhesion of the annealed ZrO 2 -CeO 2 coatings on the substrates, assessed by scratch tests, showed critical loads indicative of coating perforation of up to 32 N. Hardness and elasticity, measured using depth-sensing nanoindentation tests, gave a hardness and elastic modulus of 4.5 GPa and 98 GPa, respectively. Salt spray corrosion tests performed on these coatings showed superior corrosion resistance for AZ91D (as-casted and machined) and AZ31 (machined), while severe corrosion was observed for the AZ31 (rolled) and AZ91D (sand-blasted) magnesium alloy substrates.

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