Department of Mechanical Engineering
Material Science and nanotechnology, polymers, Photovoltaic (PV) technologies and Batteries
Synthesis of nano tubes and effectively working on batteries are highly effective for charging and discharging the batteries capacity. TiO2 nano tubes are highly cost when sources from outside, but fabrication with electrochemical make everything easy.
Future science maximum based on the renewable energy resources. Producing the electric power with photovoltaic systems are highly encouraged in this present and future research workers. Incorporate with the TiO2 nanotubes in the photovoltaic materials are highly accepted process.
Mani Purusothaman, Vetrivel Sivaprakash, A. Dyson Bruno, Subramani Sekar, and L. Martin Wiley
Mohammed-Ibrahim Jamesh, Arumugam Akila, Dhakshinamoorthy Sudha, Karunanidhi Gnana Priya, Vetrivel Sivaprakash, and Arumugam Revathi MDPI AG
The fabrication of earth-abundant electrocatalysts by green-chemistry approaches for electrochemical water splitting could diminish or alleviate the use or generation of hazardous substances, which could be highly desirable to achieve efficient, green alkaline water electrolysis for clean energy production (H2). This review started by introducing the importance of the green-chemistry approaches. Later, this paper reviewed the fabrication of high-performance earth-abundant electrocatalysts using green-chemistry approaches for electrochemical water splitting (HER and OER). Moreover, this review discussed the green-chemistry approaches for the fabrication of earth-abundant electrocatalysts including phosphide/pyrophosphate-, carbon-, oxide-, OH/OOH/LDH-, alloy/B/nitride-, and sulfide/selenide (chalcogenide)-based earth-abundant electrocatalysts. Moreover, this review discussed various green-chemistry approaches, including those used to alleviate toxic PH3 gas emission during the fabrication of transition-metal phosphide-based electrocatalysts, to design energy-efficient synthesis routes (especially room-temperature synthesis), to utilize cheap or biodegradable substrates, and to utilize biomass waste or biomass or biodegradable materials as carbon sources for the fabrication of earth-abundant electrocatalysts. Thus, the construction of earth-abundant electrocatalysts by green-chemistry approaches for electrochemical water splitting could pave an efficient, green way for H2 production.
R. Suganya, A. Revathi, D. Sudha, V. Sivaprakash, and E. Ranjith Kumar Springer Science and Business Media LLC
D. Sudha, R. Suganya, A. Revathi, K. Yoghaananthan, and V. Sivaprakash Trans Tech Publications, Ltd.
The low weight and high strength ratio of titanium alloy make TiO2 nanotubes ideal for biomedical applications. Increasing the oxidation process has recently been studied as a means of encouraging the formation of nanotubes. This study synthesizes the TiO2 nanotubes with different input voltages. There was an increase in nanotube growth rate as a result of de-ionized water in the electrolyte, as well as an increase in the input potential, which favours oxidation. An analysis of the surface morphology suggests that rib structures were generated in the area where corrosion results were greatly elevated. X-ray diffraction and nanoindentation were used to study phase transformations and nanohardness respectively.
K. Tamil Mannan, V. Sivaprakash, S. Raja, Mohanraj Kulandasamy, Pravin P Patil, and S. Kaliappan Elsevier BV
K Tamil Mannan, V. Sivaprakash, S. Raja, Pravin P Patil, S. Kaliappan, and S. Socrates Elsevier BV
L. Natrayan, Piyush Gaur, Anjibabu Merneedi, S. Kaliappan, Pravin P. Patil, V. Sivaprakash, and Muse Degefe Chewaka Hindawi Limited
DLC coatings are deposited on aluminium substrates to improve the wear resistance property of the substrates using sputtering deposition in this study. DLC coatings are deposited using the graphite target onto the Al5051 substrates using DC sputtering. The deposited coatings are then analyzed for their adhesion strength, hardness, coefficient of friction, and chemical compositions. The pin-on-disk method is conducted in vacuumed conditions, dry air conditions (0% RH), and ambient air conditions (40% RH). The different testing conditions have shown different results for the same testing sample. This indicates the nature of DLC film adsorption in ambient air conditions. The chemical composition study has further revealed the adsorbing compounds and the ability of hydrogen and water molecules to get adsorbed on the thin-film surface. This study gives insight into the effect of molecules present in the ambient air on the performance of DLC coatings. It investigates the effect of three DLC coatings deposited using the graphite target onto the Al5051 substrates using DC sputtering.
L. Natrayan, S. Angalaeswari, S. Kaliappan, C. Naga Dheeraj Kumar Reddy, V. Sivaprakash, Pravin P. Patil, and P. Murugan Hindawi Limited
Single-walled carbon nanotube (SWCNT) plays a major role in electromagnetic absorption and shielding. Their applications as semiconductors make a breakthrough in communication by miniaturizing the communication devices. The main drawback of the SWCNT is found to 1 / f noise. Because of this limitation, high attenuation at the low-frequency band cannot be achieved, limiting its application in terms of selectivity. The spectral density study shows that the noise’s amplitude is directly proportional to the temperature and inversely proportional to the number of carriers in the nanotube. The SWCNT is mainly synthesized using hydrocarbons which contains carbonaceous impurities. On the removal of impurities, more surface oxygen functional groups are formed. On the other hand, the diameter of the carbon nanotube is very small, increasing the resistance of carrier flow. In this research work, gas adsorption was used in SWCNT by treating the carbon nanotube using nitric acid. Isotherms determine porous size. The adsorbate-adsorbent interaction on carbon nanotube reduces the microporosity in the surface by treating with nitric acid. Therefore, the density of the surface increases and the CNT bundle separation will be reduced, increasing the carbon nanotube’s resistivity. This increase in resistivity reduces the excess carrier flow; therefore, the temperature will reduce the 1 / f noise. The proposed system is cost-effective and has shown 11% improvement by reducing the noise amplitude by increasing carbon nanotube resistance. This proposed method has less complexity compared with existing models.
V Sivaprakash and R Narayanan SAGE Publications
Fabrication of TiO2 nanotubes (NTs) has extensive application properties due to their high corrosion resistant and compatibility with biomedical applications, the synthesis of TiO2 nanotubes over titanium has drawn interest in various fields. The synthesis of TiO2 NTs using novel in-situ step-up voltage conditions in the electrochemical anodization process is recorded in this work. For manufacturing the NTs at 1 hour of anodization, the input potential of 30, 40 and 50 V was selected. With increasing step-up voltage during the anodization process, an improvement in the NTs was observed, favoring corrosion resistance properties. The surface of NTs enhances the structure of the ribs, raising the potential for feedback over time. XRD was used to analyze phase changes, and HR-SEM analyzed surface topography. Impedance tests found that longer NTs improved the corrosion resistance.
V. Sivaprakash, L. Natrayan, R. Suryanarayanan, R. Narayanan, and Prabhu Paramasivam Hindawi Limited
Nowadays, titanium and alloy materials are encouraged for biomedical applications. Fabrication of the passive layer over the titanium materials is limited. Typically, a plain titanium sample is not suitable for bioimplant applications because the adhesion of biological elements like blood cells, tissues, and bones is poor. The use of surface-modified titanium resolves this issue. Surface modifications on titanium by electrochemical methods are simple and cost-effective. The addition of water to the ethylene-based electrolyte-enhanced the oxidation process to increase the length of the nanotubes. Surface morphological analysis shows that the length of the nanotubes has been increased, nanoindentation analysis delivers that increasing the length has been increased the hardness level, and corrosion analysis indicates that the length of nanotubes encouraged the corrosion resistance. Potentiodynamic polarization, Bode and Nyquist plots were models fit analyzed with equivalent electrical circuits. Sample cell viability was characterized with NIH-3T3 cells using an inverted microscopy analyzer.
V. Sivaprakash and R. Narayanan Trans Tech Publications, Ltd.
Electrochemical anodization is a unique surface modification technique for modifying the titanium surface. Electrochemical alteration of titanium surface increases the material efficiency in biomedical applications. The present research work analyses the fabrication of TiO2nanotubes by increasing the water content and the various results and characterization enhance the cell viability. The influence of water content in electrolytes improves cell viability and at the same time, it is non-toxic. The surface morphologies were studied with HR-SEM, phase transformation was characterized using X-ray diffraction and cell viability was investigated with MTT assay by NIH-3T3 fibroblast cells incubation time for 48 hours (standard time incubation).
V. Sivaprakash and R. Narayanan Springer Science and Business Media LLC
V. Sivaprakash and R. Narayanan Elsevier BV
Sivaprakash Vetrivel and R. Narayanan Elsevier BV