Samrat Paul

Nickel oxide nanoparticles: A novel antioxidant

We investigated a novel inorganic (nickel oxide) nanoparticles as a potential antioxidant in the biosystems. The particles were synthesized using self-propagating high-temperature synthesis (SHS) method at 650 degrees C. The antioxidant property of the nickel oxide particles was investigated in an in vitro system, using modified DPPH method for insoluble solid materials.

A green precursor for carbon nanotube synthesis

Abstract The present work aims to explore a natural renewable precursor for the synthesis of multiwalled carbon nanotubes (MWCNTs), conforming to the principles of green chemistry. MWCNTs were synthesized by chemical vapor deposition using a natural renewable precursor (coconut oil). Nitrogen gas was used as an inert atmosphere as well as a carrier for the evaporated precursor (flow rate: 100 mL/min). The synthesized MWCNTs are characterized by scanning and transmission electron microscopy, electron dispersive X-ray analysis, and Raman spectroscopy. The diameters of the synthesized nanotubes are in the range of 80 nm to 90 nm under optimum conditions.

Ultrasonication: Enhances the antioxidant activity of metal oxide nanoparticles

The present work is a modification for Serpen et al.s method for antioxidant activity determination for insoluble materials with special reference to metal oxide nanoparticles. As reported in our former publications the mixing procedures were followed as mentioned by Serpen et al. A new mixing procedure was followed for enhancing the reaction between metal oxide nanoparticles and DPPH in the solution. The sonication inside a water bath enhances the DPPH scavenging capacity of metal oxide nanoparticles up to 13.94% and 18.96% in case of ferric oxide and nickel oxide nanoparticles respectively. The control DPPH solution without any nanoparticles does not show any degradation due to sonication.

Carbon Microtubes Produced from Coconut Oil

The synthesis of a new class of carbon with tubular morphologies is reported. Carbon microtubes (CMTs), having a high aspect ratio were prepared from a natural renewable precursor (coconut oil) by chemical vapor deposition. The CMTs were synthesized in a nitrogen atmosphere at a temperature of 1175℃ and at a flow rate of 100mL/min using ferrocene as catalyst. The synthesized CMTs were characterized by SEM, EDX, TEM, and Raman spectroscopy. The internal diameters of the tubes are around one micron and the external diameters were in the range of 1.7μm to 2.1μm.

Colloidal silver nanoparticles/rhamnolipid (SNPRL) composite as novel chemotactic antibacterial agent

The antibacterial activity of silver nanoparticles and rhamnolipid are well known individually. In the present research, antibacterial and chemotactic activity due to colloidal silver nanoparticles (SNP), rhamnolipid (RL) and silver nanoparticles/rhamnolipid composite (SNPRL) were evaluated using Staphylococcus aureus (MTCC3160), Escherichia coli (MTCC40), Pseudomonas aeruginosa (MTCC8163) and Bacillus subtilis (MTCC441) as test strains. Further, the SNPRL nanoparticles were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR). The observation clearly indicates that SNPRL shows prominent antibacterial and chemotactic activity in comparison to all of its individual precursor components.

Organic photovoltaic cells using MWCNTs

Abstract MWCNTs were synthesized by chemical vapor deposition from Sesamum indicum oil, functionalized, cut into short lengths and used as additives in organic photovoltaic solar cells (OPVs) using poly (3-octylthiophene) (P3OT) as a photoactive molecule and (6,6)-phenyl-C61-butyric acid methyl ester (PCBM) as an exciton dissociation agent. Results indicate that the addition of the MWCNTs and the functionalized and cut MWCNTs increases the power conversion efficiency of the OPVs by 22 and 40%, respectively. MWCNTs improve the collection and transportation of holes from the P3OT after exciton dissociation owing to their high hole mobility. The functionalization and cutting of MWCNTs improves their dispersion in P3OT and PCBM, which further increases the power conversion efficiency.

Advances in Systems, Control and Automation

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High UV/visible light activity of mixed phase titania: A generic mechanism

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