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Here we report for the very first time the synthesis of 100% phase pure calcium silicate nanoparticles (CSNPs) of the α-wollastonite phase without using any surfactant or peptizer at the lowest ever reported calcination temperature of 850 °C. Further, the phase purity is confirmed by quantitative phase analysis. The nano-network like microstructure of the CSNPs is characterized by FTIR, Raman, XRD, FESEM, TEM, TGA, DSC etc. techniques to derive the structure property correlations. The performance efficacies of the CSNPs against gram-positive e.g., S. pyogenes and S. aureus (NCIM2127) and gram-negative e.g., E. coli (NCIM2065) bacterial strains are studied. The biocompatibility of the CSNPs is established by using the conventional mouse embryonic osteoblast cell line (MC3T3). In addition, the biofilm inhibition efficacies of two varieties of CSNPs e.g., CSNPs(W) and CSNPs(WC) are investigated. Further, the interconnection between ROS e.g., superoxide (O 2 .- ) and hydroxyl radical ( . OH) generation capabilities of CSNPs and their biofilm inhibition efficacies is clearly established for the very first time. Finally, the mechanical responses of the CSNPs at the microstructural length scale are investigated by nanoindentation. The results confirm that the α-wollastonite phases present in CSNPs(W) and CSNPs(WC) possess extraordinarily high nanohardness and Young's moduli values. Therefore, these materials are well suited for orthopaedic and endodontic applications. [ABSTRACT FROM AUTHOR]

Cordierite based glass-ceramics were used to glaze floor tiles by microwave and conventional processing techniques. The surface roughness (Ra) values of the microwave and conventionally processed glazes were ~3.73µm and ~11.96µm, respectively. The Vickers hardness value for the conventionally processed glaze was ~1.63GPa while it was ~5.04GPa for the microwave processed glaze. Gradual transition of nanohardness and Young's modulus values was observed from the substrate to glaze for both conventional and microwave processed glazed tiles. Scratch and impact resistance of the microwave processed glass-ceramic glaze was superior to those of the conventionally processed one. [ABSTRACT FROM AUTHOR]