Showing papers by "Prathap Haridoss published in 2020"
TL;DR: A review of the tensile properties of carbon nanotube reinforced aluminium matrix (Al-CNT) composites can be found in this article, where various processing routes for fabrication of AlCNT composites have been compared in terms of the resulting microstructure, degree of CNT dispersion, extent of interfacial reaction and its effect on the tensil properties.
118 citations
50 citations
TL;DR: Crosslinked polyvinyl alcohol (PVA) membranes with sulfonated CNT (SCNT) fillers were synthesized using solution casting method for proton exchange membrane fuel cells (PEMFC) as discussed by the authors.
Abstract: Crosslinked Polyvinyl alcohol (PVA) membranes with sulfonated CNT (SCNT) fillers were synthesized using solution casting method for proton exchange membrane fuel cells (PEMFC). Sulfonated CNTs are reported to be one of the best additives in ionic membranes as they increase the ionic conductivity and mechanical strength of the membrane. CNTs are high aspect ratio carbon allotropes, and small quantities of SCNTs (0.01 wt%, 0.1 wt%, 0.5 wt%, and 1 wt%) are observed to make a significant difference in properties of membranes. These membranes were characterized for water uptake capacity, ion exchange capacity, and mechanical strength. Ionic conductivity, hydrogen pumping, polarization studies, and gas crossover studies were performed in situ under various conditions of humidity. PVA–SSA–0.1 wt% SCNT showed the maximum power density among all compositions tested while short term performance of PVA–SSA–0.5 wt% SCNT exhibited the least sensitivity to changes in reactant humidity. Nafion® 115 produced 0.33 W cm−2 at 0.4 V while PVA–SSA–0.1 wt% SCNT exhibited 0.21 W cm−2 at 0.4 V. Overpotential associated with the purity of hydrogen gas was accounted for in the polarization curve and it resulted in a distinctly improved power density of 0.4 W cm−2. Performance of PVA–SSA–SCNT membranes was compared with Nafion® 115 by various characterization techniques and the results indicate that the membranes developed are a cost-effective alternative to Nafion® with the best performing PVA–SSA–SCNT membrane costing ≈1% of the cost of the Nafion® 115 membrane for similar performance.
18 citations
TL;DR: In this paper, copper/reduced graphene oxide (rGO) composites were prepared to improve the mechanical and tribological properties of copper without adversely affecting its physical properties in any significant manner.
12 citations
9 citations
TL;DR: The graded NCA shows excellent reversibility of the H2↔H3 phase leading to low impedance development confirming the reduced surface reconstruction during the initial cycles, and its specific capacity is 65% higher than that of pristine NCA at 10C.
Abstract: LiNi1–x–yCoxAlyO2 (NCA) possessing a nano-/micro hierarchical architecture delivers a high specific capacity of 200 mAh/g with an upper cutoff voltage of 4.4 V. However, the structural reconstructi...
8 citations
17 Mar 2020
TL;DR: In this paper, the vibration damping characteristics of carbon nanotubes with different structures and morphologies are studied using a free vibration test in cantilever mode. And the inner tube oscillation is established as the vibration-damping mechanism by correlating the extent of the loss factor obtained from the two nanocomposites with the dissimilarities in the structure and morphology of the two varieties of MWCNTs.
Abstract: The structure and morphology of the reinforcing material play an important role in the vibration damping characteristics of polymer composites. In this work, multiwalled carbon nanotubes (MWCNTs) with different structures and morphologies are incorporated into a polymer matrix. The vibration damping characteristics of the nanocomposites, in Oberst beam configuration, are studied using a free vibration test in cantilever mode. Inner tube oscillation is established as the vibration damping mechanism by correlating the extent of the loss factor obtained from the two nanocomposites with the dissimilarities in the structure and morphology of the two varieties of MWCNTs. Inner tube oscillation is simulated using molecular dynamics (MD). Since the open-ended double walled CNT (DWCNT) models used in earlier studies over predict the damping, we propose a capped DWCNT model. This can simulate the atomic interactions at the end caps of the tube. This study indicates that the contributions to the observed damping have their origins in the interaction between atoms that constitute the inner and outer tubes rather than the inter-tube frictional energy loss.
5 citations
TL;DR: In this paper, commercial purity aluminum was reinforced with different percentages of carbon nanohorns (CNH) using ball milling (1h) followed by spark plasma sintering (SPS) at 550°C for 5min under 50MPa pressure with heating rate 100°C/min.
Abstract: Commercial purity aluminum was reinforced with different percentages of carbon nanohorns (CNH) using ball milling (1 h) followed by spark plasma sintering (SPS) at 550 °C for 5 min under 50 MPa pressure with heating rate 100 °C/min. The microstructure, hardness and compression properties of the spark-plasma-sintered carbon-nanohorns-reinforced aluminum (Al-CNH) composites were evaluated. Transmission electron microscopy revealed a uniform distribution of 0.3% CNH in Al, but above 0.3% CNH, agglomeration occurred. The compression strength of Al-0.3%CNH composites increased by 44% compared to the milled Al sample without CNH.
4 citations
3 citations