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Ayyar Manikandan,Susaimanickam Arul Antony,Benjamin Avila Josephine,Vincent Mary Teresita 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.5
Nanocrystalline perovskite oxides, LaMgxCr1−xO3−δ (x=0.0, 0.2, 0.4, 0.6, 0.8 and 1) were prepared by sol-gel method. The samples were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy and nitrogen adsorption/desorption isotherms at 77 K, respectively, to identify the structural phases, surface morphology, vibrational stretching frequencies and BET surface area of the samples. Also, it was investigated the humidity sensing characteristics of the samples. The composites were sintered at 800 oC for 5 h and subjected to dc electrical conductivity studies at room temperature. The resistance measurements as a function of relative humidity (RH) in the range of 5-98% were done and the humidity sensing factors (Sf =R5%/R98%) calculated. The activation energy of the compounds were determined from the temperature-dependent electrical conductance experiments in the temperature range of 120-300 oC. LaMgCr-3 (x=0.4) had the highest humidity sensing factor 21407±431, while LaCr-1 (x=0) the lowest sensitivity factor 27.27±2. The response and recovery characteristics were studied for LaMgCr-3, which exhibited good linearity and a very narrow hysteresis loop. The photocatalytic activity of LaMgxCr1−xO3−δ was investigated by using the photo-decomposition of 4-chlorophenol (4-CP) under UV-visible light. The sample LaMgCr-3 (x=0.4) showed the highest photocatalytic degradation efficiency (93.05%) than other samples, due to their smaller size of particles with higher surface area.
Kamalakannan Reena,MANI GAJENDIRAN,Muthusamy Prabakaran,Susaimanickam Arul Antony,김교범 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.51 No.-
The purpose of the study was to develop caffeine-loaded gold nanoparticles (AuNPs) using a poly(lacticacid)-polyethylene glycol-poly(lactic acid) (PLA-PEG-PLA) polymer to enhance the anti-inflammatoryactivity of caffeine. Caffeine-loaded AuNPs were conjugated to PLA-PEG-PLA copolymer matrix viap-back bond between AuNPs and the ester carbonyl group of the polyester. The p-back bonded estercarbonyl oxygen strongly interacted with the caffeine molecule and exhibited enhanced antiinflammatoryactivity. The physico-chemical characteristics of the resulting nanoconjugates wereevaluated by a series of microscopic, diffraction, and spectroscopic methods. In vitro assays indicatedincreasing membrane stabilization of red blood cells and enhanced inhibition of protein denaturation