Prathap Haridoss

Bio: Prathap Haridoss is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Carbon nanotube & Proton exchange membrane fuel cell. The author has an hindex of 21, co-authored 61 publications receiving 1228 citations. Previous affiliations of Prathap Haridoss include Los Alamos National Laboratory & Plug Power.

Synthesis of graphene sheets from single walled carbon nanohorns: novel conversion from cone to sheet morphology

Abstract: Graphene sheets have been synthesized from single walled carbon nanohorns by one-step reaction with hydrogen peroxide. The obtained graphene sheets are in pure form and shows good electrical properties. As-synthesized graphene acts as dual function of support as well as reducing agent to prepare graphene-silver nanoparticle composite having uniform particle size of 6 nm. This method can easily be scalable to prepare graphene or graphene supported metal nanoparticle composites for versatile applications.

Infrared Spectroscopy Signatures of Aluminum Segregation and Partial Oxygen Substitution by Sulfur in LiNi0.8Co0.15Al0.05O2

Abstract: Substitution of aluminum in nickel-rich layered oxides plays a vital role in structural and thermal stability. Hence comprehension of aluminum distribution in nickel-rich layered oxides such as LiNi0.8Co0.15Al0.05O2 (LNCA) is crucial. However, investigation of aluminum distribution in LNCA is extremely challenging, and sophisticated techniques such as 27Al and 7Li MAS NMR, individual atom probe tomography, X-ray and neutron diffraction, and SQUID magnetic susceptibility measurements are recently employed. We demonstrate the use of a combination of versatile techniques such as X-ray diffraction, energy dispersive X-ray analysis mapping, and vacuum Fourier transform infrared spectroscopy to identify the distribution of aluminum and anion substitution at the oxygen site in LNCA synthesized by the coprecipitation-assisted solid-state reaction. The influence of metal salts used for the coprecipitation of α/β interstratified Ni1–x–yCoxAly(OH)2 (x = 0.15, y = 0/0.05) on anion substitution at the oxygen site in L...

I and i

Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality. Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

Fast parallel algorithms for short-range molecular dynamics

Abstract: Three parallel algorithms for classical molecular dynamics are presented. The first assigns each processor a fixed subset of atoms; the second assigns each a fixed subset of inter-atomic forces to compute; the third assigns each a fixed spatial region. The algorithms are suitable for molecular dynamics models which can be difficult to parallelize efficiently—those with short-range forces where the neighbors of each atom change rapidly. They can be implemented on any distributed-memory parallel machine which allows for message-passing of data between independently executing processors. The algorithms are tested on a standard Lennard-Jones benchmark problem for system sizes ranging from 500 to 100,000,000 atoms on several parallel supercomputers--the nCUBE 2, Intel iPSC/860 and Paragon, and Cray T3D. Comparing the results to the fastest reported vectorized Cray Y-MP and C90 algorithm shows that the current generation of parallel machines is competitive with conventional vector supercomputers even for small problems. For large problems, the spatial algorithm achieves parallel efficiencies of 90% and a 1840-node Intel Paragon performs up to 165 faster than a single Cray C9O processor. Trade-offs between the three algorithms and guidelines for adapting them to more complex molecular dynamics simulations are also discussed.

American Society for Testing and Materials

Abstract: The American Society for Testing and Materials (ASTM) is an independent organization devoted to the development of standards.

Palladium-Based Electrocatalysts for Alcohol Oxidation in Half Cells and in Direct Alcohol Fuel Cells

Abstract: Direct alcohol fuel cells (DAFCs) are attracting increasing interest as power sources for portable applications due to some unquestionable advantages over analogous devices fed with hydrogen.1 Alcohols, such as methanol, ethanol, ethylene glycol, and glycerol, exhibit high volumetric energy density, and their storage and transport are much easier as compared to hydrogen. On the other hand, the oxidation kinetics of any alcohol are much slower and still H2-fueled polymer electrolyte fuel cells (PEMFCs) exhibit superior electrical performance as compared to DAFCs with comparable electroactive surface areas.2,3 Increasing research efforts are therefore being carried out to design and develop more efficient anode electrocatalysts for DAFCs.