Synthesis of Corrosion-resistant Nanocrystalline Nickle-copper Alloy Coatings by Pulse-plating Technique

Bright and smooth nanocrystalline Monel-type Ni-Cu alloy gets deposited from complex citrate electrolyte by pulse electrolysis. Transmission electron microscopy studies have revealedthat the deposited Ni-Cu alloy was nanocrystalline in nature and it comprised a two-phase (fcc+Ll,) mixture. The presence of twins could be seen in the nanocrystals. The Ni-Cu alloysprepared by pulse electrolysis were finer grained (- 2.5-28.5 nm) than those deposited by direct current method. Nelson-Riley function has been used to calculate the lattice parameters for both the pulse current-plated and direct current-plated alloys from x-ray diffraction analysis. The microhardness values for pulse current-plated alloys were higher than for the direct currentplated alloys. The internal stresses of both the pulse current-deposited and the direct currentdeposited alloys have also been measured; the values were lower for pulse current-plated alloys. Potentiodynamic polarisation studies were carried out in aerated and deaerated neutral 3.0 Wt per cent NaCl solution and instantaneous corrosion current density of the plated alloy was determined and compared with the Monel-400 alloy. It was found that nanocrystalline pulse current-N,-35 8 Wt p;r cent copper alloy uxh~bitedlo wer instantaneous value of corros~onc urrent densirv than that of soeclrnens with direct current method and Monel-400 allov The d~ssolut~on ~ ~~~~-~ behaviour ofthe deposited nanocrystalline material was found to be more like general corrosion rather than localised corrosion as in the case of Monel-400 alloy

Genome-wide association study for Atopy and Allergic Rhinitis in a Singapore Chinese population

10.1371/journal.pone.0019719PLoS ONE65

Hallmark of quantum skipping in energy filtered lensless scanning electron microscopy

We simulate the electronic system of ejected electrons arising when a tip, positioned few 10 amp; 8201;nm away from a surface, is operated in the field emission regime. We find that, by repeated quantum reflections quantum skipping , electrons produced at the nanoscale primary site are able to reach the macroscopic environment surrounding the tip surface region. We observe the hallmark of quantum skipping in an energy filtered experiment that detects the spin of the ejected electron

A Flow Injection Immunosensor for the Detection of Atrazine in Water Samples

Quantification of atrazine in a sample was performed using a post-reactive column consisting rabbit anti-immunoglobulin G for trapping atrazine specific antibodies bound to antigen and tracer. The assay is based on a competitive enzyme immunoassay where the analyte and known amount of tracer (peroxidase labeled hapten) bind competitively to available sites of anti-atrazine antibodies. The absorbance signal, proportional to the amount of antigen present, is generated with the unbound tracer passing through the column, and monitored continuously with a spectrophotometer. Several parameters which affect the immunosensor response were evaluated, including the flow rate through the column, stability of enzyme tracer in the column, for increasing the sensitivity of the system. The immunosensor has a detection limit of 1 ng/ml with good signal precision app. 2 % in the optimum working concentration range between 1 – 100 ng/ ml of atrazine in standard water sample