PSG College of Technology

About: PSG College of Technology is a based out in . It is known for research contribution in the topics: Machining & Thin film. The organization has 3174 authors who have published 3575 publications receiving 40690 citations.

Influence of Cobalt on the Hot Deformation Characteristics of an NiTi Shape Memory Alloy

Abstract: Among shape memory alloys (SMAs), Ni–Ti alloys are more widely used in multifarious sectors because of their functional properties of shape memory effect and superelastic effect. With an emphasis on miniaturization and higher performance of actuators and biomedical devices these days, there is a necessity to develop SMAs with high stiffness, i.e., high upper/lower plateau stress, and high modulus. In recent times, there have been attempts to improve their shape memory characteristics, mechanical properties and corrosion resistance through alloying, thermal treatment, etc. In this context, addition of Co has been made to binary Ni–Ti alloys. But till date, there has been a dearth of literature on hot deformation characteristics of NiTiCo SMAs. This work therefore investigates the role of cobalt on hot deformation characteristics of an Ni–Ti SMA. The addition of cobalt results in raising the yield strength and reducing the Ms temperature of the alloys. In this study, elemental forms of high-purity nickel, titanium and cobalt were melted together in a vacuum induction melting furnace to produce cylindrical rods. These rods were homogenized at 900 °C for 3 h and quenched to room temperature in water and subsequently machined so as to obtain a length-to-diameter ratio of 1.5, which was ideal to carry out hot deformation studies on a Gleeble thermomechanical simulator. The samples were deformed at different strain rates (0.01, 0.1, 1 and 10 s−1) at temperatures of 800, 900, 1000 and 1100 °C, respectively. Elaborate results on the deformation characteristics of an NiTiCo SMA have been discussed in this paper.

Electrochemical detection of fenitrothion usingnanosilver/dodecane modified glassy carbon electrode

Abstract: A novel nanosilver/dodecane modified electrode was fabricated and employed for electrochemical sensing of fenitrothion presented in the environmental samples such as potatoes and paddy. The electrocatalytic activity of the modified electrode exhibited a lower reduction potential and higher sensing current in the detection of fenitrothion. A least value of limit of detection (LOD) was observed compared to that of the electrodes employed. The electrode was found to be exceptionally stable and have constant sensitivity for many cycles of analysis. The result observed in the electrochemical approach was well comparable with that by HPLC technique. The modified electrode is certainly a viable and an alternative to the high cost HPLC technique in detecting fenitrothion kind of pesticide samples.

Formation of hexagonal shaped wurtzite zinc sulphide nano rods

Abstract: Zinc sulfide nanorods with good photoluminescence have been successfully fabricated using a simple sol-gel process via ultrasonication, with mercaptoethanol as capping agent. The formation of ZnS nucleation, followed by subsequent growth, is significant in obtaining highly oriented ZnS nanorods. Temperature, time, and capping agent also proved to be significant factors in the growth of ZnS nanorods and greatly affect their photo luminescent properties. X-ray diffraction (XRD) analysis, low and high-resolution transmission electron microscopy (TEM & HRTEM), selected-area electron diffraction (SAED) pattern, and scanning electron microscopy (SEM) indicated that the ZnS nanorods were single crystal in nature and that they had grown up preferentially along the [0001] direction. This simple method of nucleation, followed by their successive growth, resulted in the development of an effective and low-cost fabrication process for high-quality ZnS nanorods with good photo luminescent properties that can be applied to luminescent sensors and optoelectronic devices.