v. Anandan; G. Manimaran; G. Uthra
Abstract
The conventional flood cooling method fails to minimize the heat generation in the cutting areas and make adverse effect on the environment during machining process. Hence CMQL (Cryogenic Minimum Quantity Lubrication) is used as coolant in this work, which gives lubrication and reduces the temperature ...
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The conventional flood cooling method fails to minimize the heat generation in the cutting areas and make adverse effect on the environment during machining process. Hence CMQL (Cryogenic Minimum Quantity Lubrication) is used as coolant in this work, which gives lubrication and reduces the temperature to greater extend and also it is environment friendly. The selection of cutting conditions and appropriate tools for efficient machining process is a challenging process, hence it is necessary to optimize the machining parameters. A modified TOPSIS method using Gower distance has been proposed in this paper for the optimization of Nimonic 80A alloy. The machining parameters such as Surface Roughness (Ra) and Temperature (T) under 3 different environments namely (i) dry, (ii) wet and (iii) cryogenic MQL with different feed rate & cutting speed are examined in the optimization of Nimonic 80A alloy. Optimized results confirm that environment and feed rate are dominant factors and the environment influence is about 84.6%, followed by feed rate at 10.1%. Cryogenic MQL has better effectiveness compared to conventional cooling. The modified TOPSIS method is found to be more effective in machining problems.
Ketan Jagtap; Raju Pawade
Abstract
Biomanufacturing integrates life science and engineering fundamentals to produce biocompatible products improving the pre-eminence of living. Face turning is an important process used for producing the higher accuracy on metal implants especially on sliding parts. In this experiment effect of depth of ...
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Biomanufacturing integrates life science and engineering fundamentals to produce biocompatible products improving the pre-eminence of living. Face turning is an important process used for producing the higher accuracy on metal implants especially on sliding parts. In this experiment effect of depth of cut, feed rate and cutting speeds are considered on machined Co-Cr-Mo bio-implant alloy by application of RSM. The offline and online measured surface roughness (Ra) and cutting force (Fc) were considered respectively as response variables for investigations. The experimental result shows that depth of cut and feed rate are having predominating effect on measured surface roughness and cutting force respectively. Therefore, the developed models can be efficiently used to predict the surface roughness and cutting force on the machinability of Co-Cr-Mo alloy within 95% confidence intervals ranges of measured parameters. For checking the adequacy of model a confirmation test has been conducted. The optimized parameters can be useful for industrial developments in surface generation for bio-implants. Copyright © 2018 VBRI Press.
Pragati Jamdagni; Poonam Khatri; J. S. Rana
Abstract
The current study reports biogenic synthesis of silver nanoparticles from Elettaria cardamomum. Elettaria leaf extract was used as reducing and capping agent for nanoparticle synthesis from parent solution of silver nitrate. Nanoparticle suspension was characterized mainly using UV-Visible spectroscopy. ...
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The current study reports biogenic synthesis of silver nanoparticles from Elettaria cardamomum. Elettaria leaf extract was used as reducing and capping agent for nanoparticle synthesis from parent solution of silver nitrate. Nanoparticle suspension was characterized mainly using UV-Visible spectroscopy. Synthesis parameters namely, time, metal ion concentration, leaf extract quantity, reaction temperature and pH are well known to affect the final product of synthesis and hence, were varied to assess optimum conditions for synthesis. Nanoparticles synthesized at optimum conditions were washed and characterized using Fourier Transform Infrared Spectroscopy (FTIR), X-ray diffraction (XRD), Dynamic Light Scattering (DLS) and Transmission Electron Microscopy (TEM). Nanoparticles obtained were in the size range of 5-80 nm (TEM), with an average particle size of 29.96 nm as calculated using Debye-Scherrer formula and average hydrodynamic diameter of 32.12 nm (DLS). FTIR implicates plausible role of protein part of leaf extract in nanoparticle synthesis and DLS confirms monodisperse nature of the suspension. Nanoparticle suspension was found to be stable after four months of storage at room temperature without the addition of any stabilizing agents. Silver nanoparticles exhibited excellent antifungal activity against various fungal phytopathogens with minimum inhibitory concentration as low as 8 µg/mL for Aspergillus niger, making them potential antifungal agents in the field of agriculture. Copyright © 2018 VBRI Press.
Ravi Jon; Vipul Singh; D.P Jayapandian
Abstract
The main aim of this research is to propose the various green reducing agents for extract the green gold nanoparticles from Gold Chloride (HAucl4) solution. Green reducing agents are safe and eco-friendly for the extraction of the gold nanoparticles. The green gold nanoparticles were synthesized using ...
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The main aim of this research is to propose the various green reducing agents for extract the green gold nanoparticles from Gold Chloride (HAucl4) solution. Green reducing agents are safe and eco-friendly for the extraction of the gold nanoparticles. The green gold nanoparticles were synthesized using plant and fruit extract, and green Gold nanoparticles were characterized using SEM, TEM, and UV-Vis. Spectroscopy. The absorption peak was observed at 530-540 nm, which proved the green gold nanoparticles. Green Gold nanoparticles in the size of 30 nm in the spherical shape were confirmed by transmission electron microscopy. The toxicity of green gold nanoparticles is less than gold nanoparticles. These green gold nanoparticles can be used in various biomedical applications. Green reducing agents are the best alternative for the synthesis of the gold nanoparticles. Copyright © 2017 VBRI Press.
