No abstract

In this work, a series of N-hydroxy-2,6-diaryl-3-alkylpiperidin-4-one semicarbazones and thiosemicarbazones have been synthesized and also subjected towards cyclic voltammetric studies. The structure of reduced products was confirmed by FTIR, 1H & 13C NMR spectral analysis. Further products were also screened for antimicrobial activities and it shows high significant effect towards Aspergillus niger among the eight tested fungal species. The propency towards order of reduced products is observed sharply and it was established that irreversible reduction of two electron transfers has taken for all four synthesized compounds and highly pH dependent. Among the synthesized compound, thiosemicarbzones showed versatile features with high diffusion coefficient value in minimum power consumption of current function.

A series of poly (N-cyclohexylacrylamide-co-Acrylamide/Maleic acid) /OMMT nanocomposite hydrogels (NC) were prepared from free-radical copolymerization in water/methanol medium using ammonium persulfate (APS) as a free radical initiator and N,N’- methylene-bis-acryl amide(MBA) as the cross-linker at 60˚C. The nanocomposite hydrogels were synthesized via in situ polymerization using organo modified MMT (O-MMT) nano clay. The optimum swelling of nanocomposite superabsorbents was achieved at 0.150g of OMMT nanoclay. The synthesized nanocomposites were characterized by FTIR, SEM, XRD and TGA techniques. Swelling and diffusion parameters in water and dye solution were calculated. The effect of two cationic salt solutions on the swelling was studied. The hydrogel nanocomposites showed up to 99.9% removal efficiency towards methylene blue dye adsorption study.

In the present study, 3-(Methacryloylaminopropyl) trimethylammonium chloride, acrylamide and N-cyclohexylacrylamide monomeric unit containing hydrogels were synthesized by free radical copolymerization using MBA as cross-linker APS as initiator in methanol/water medium at 600C. The synthesized hydrogel was confirmed by IR spectroscopy. The XRD analysis indicated that the hydrogel exhibited more amorphous and less crystalline in nature. SEM analysis showed sponge like morphology. TGA analysis showed double stage decomposition and stability up to 270OC. The swelling behavior of hydrogels increased with increasing amount of MPTMACl content. At higher content of MPTMACl, the swelling rate decreased due to the extent of cross linking occurring during the synthesis of hydrogel. The effect of temperature on swelling increases with increasing temperature up to 30OC and then decreased due to reduction in segmental mobility of polymeric chain at higher temperature.