Efficient synthesis of a series of pyrazolylbiscoumarin (4a -4e) and pyrazolylxanthenedione derivatives (5a -5e) is described. The structures of the synthesized compounds were confirmed by their spectral data (IR, 1 HNMR and 13 CNMR). All the synthesized compounds 4 and 5 were screened for their antibacterial activity against Gram-positive bacteria S. aureus and Gram-negative bacteria K. pneumoniae. The tested compounds exhibited varying degree of antibacterial activity, showing the inhibition zone size ranging from 6 to 21 mm.

Nanoindentation hardness and elastic modulus of the silver/MWCNT (multiwalled carbon nanotubes) composites, fabricated by modified wet mixing technique, are studied in the present work. CNT reinforced silver nanocomposites, fabricated by introducing 4.5 volume percentages of CNT in the silver matrix, have increased elastic modulus and approximately 50% higher hardness than pure nanosilver. It is also observed from the results that the electrical conductivity of the fabricated materials was decreased by increasing the CNTs volume %.