A5012195455- Advanced Battery Technologies Research
- Electrochemical Analysis and Applications
- Advancements in Battery Materials
- Nuclear reactor physics and engineering
- Concrete Corrosion and Durability
- Advanced Battery Materials and Technologies
- Corrosion Behavior and Inhibition
- Graphite, nuclear technology, radiation studies
- Nuclear Materials and Properties
- Molecular Junctions and Nanostructures
- Radioactive element chemistry and processing
- Non-Destructive Testing Techniques
- Extraction and Separation Processes
- Nuclear Engineering Thermal-Hydraulics
- Nuclear and radioactivity studies
- Conducting polymers and applications
- Smart Materials for Construction
- Ionic liquids properties and applications
- Additive Manufacturing Materials and Processes
- Analytical Chemistry and Sensors
- Structural Integrity and Reliability Analysis
- Surface and Thin Film Phenomena
- Polymer composites and self-healing
- Electrocatalysts for Energy Conversion
- Surface Chemistry and Catalysis
Madurai Medical College
2015-2023
Johns Hopkins University Applied Physics Laboratory
2009-2023
Indira Gandhi Centre for Atomic Research
1994-2015
Johns Hopkins University
1989-2012
Georgetown University
1986
Multifrequency impedance measurements have been recognized as a technique for the monitoring of individual cells in lithium-ion (Li-ion) batteries. However, its practical introduction battery management has slow, mainly due to added size and larger operating power requirements. Here, we describe small, low-power, multifrequency (1-1000 Hz) impedance-based system (BMS) multicell batteries varying capacities. This BMS ensures safety efficiency by tracking acting on emerging mismatches other...
It is presumed that heat generated from a trigger cell under thermal runaway (TR) in multi-cell Li-ion batteries transferred to adjacent cells mostly by convection of ejected hot matter (and lesser degree direct contact and radiative transfer). Therefore, venting the energized materials (ejecta) battery compartment should prevent cell-to-cell TR propagation. However, engineering solutions vent ejecta an individual fail propagation, subsequently causing fires. Real-time situ FTIR spectroscopy...
Approaches for thermal management of lithium-ion (Li-ion) batteries do not always keep pace with advances in energy storage and power delivering capabilities. Root-cause analysis empirical evidence indicate that runaway (TR) cells cell-to-cell propagation are due to adverse changes physical chemical characteristics internal the cell. However, industry widely uses battery systems (BMS) originally designed aqueous-based manage Li-ion batteries. Even “best” BMS monitor both voltage...
Abstract Fire and deflagration that might occur in high-energy content/high-power lithium ion (Li-ion) batteries are due to propagation of thermal runaway (TR) from just a single failing “trigger” cell the remaining fully-functional cells. Here we describe iterative housing designs multi-cell Li-ion battery module with goal preventing cell-to-cell TR trigger cells module. After series experimental tests iterations, demonstrate module, containing eight fully charged 18650 connected series,...
Abstract Additively manufactured scandium-doped AA5083 aluminum-magnesium alloy (AA5083-Sc) has a higher yield strength compared to the undoped version. However, AA5083-Sc is prone pitting and microbiologically induced corrosion in seawater. Chemical conversion coating using aqueous cerium (III) nitrate, Ce(NO 3 ) , provides only moderate improvement resistance. Electrochemical anodic oxidation of alloy’s surface 0.2-M solution at pH 4, conducted over an extended period low current density,...
Taking inspiration from eukaryotic cilia, we report a method for growing dense arrays of magnetically actuated microscopic filaments. Fabricated the bottom-up assembly polymer-coated cobalt nanoparticles, each segmented filament measures approximately 5–15 µm in length and 23.5 nm diameter, which was commensurate with width single nanoparticle. A custom microscope stage actuates filaments through orthogonal permanent alternating magnetic fields. We implemented design experiments (DOE) to...
Abstract Electric vehicles were introduced in the year of 1908, where they have larger battery for power supply. Now- a- days technique charging e-bikes is done either by using grid supply or solar power. This paper says about circuit batteries which uses both and from to charge electric vehicles. The with helps reduce emission grid. Ever-increasing demand fuel supply, rising prices, increased environmental awareness among masses are paving way (EVs). Although, recent years EV market has...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrder and stability of an electrochemically condensed adenine layer on graphiteR. Srinivasan P. GopalanCite this: J. Phys. Chem. 1993, 97, 34, 8770–8775Publication Date (Print):August 1, 1993Publication History Published online1 May 2002Published inissue 1 August 1993https://pubs.acs.org/doi/10.1021/j100136a020https://doi.org/10.1021/j100136a020research-articleACS PublicationsRequest reuse permissionsArticle Views77Altmetric-Citations39LEARN ABOUT...
The surface areas of Pt and Pt–Ru alloys have been estimated by a fractal technique. Fractal measurements were made using scanning tunneling microscope (STM), which measures the corrugations. This STM-based technique is offered as an alternative to gas adsorption for area estimation. usefulness approach calculation in alloy, where hydrogen cannot be used, demonstrated kinetics methanol oxidation.
Ruthenium from pure nitrosyl nitrate solution, nitrate, and simulated high level liquid waste (SHLLW) in HNO3 medium has been separated by oxidizing with ammonium ceric (ACN) trapping the RuO4 vapor n-paraffin hydrocarbon (NPH). Systematic studies for improving separation efficiency yielded 80% Ru solutions 1M HNO3, using 0.02–0.04M Ce(IV) as agent at ambient temperature. The optimum process parameters separating 80–90% ruthenium solution (in form of Ru(NO3)3) were determined to be 0.04M ACN...
Painting is a cost-effective technique to delay the onset of corrosion in metals. However, protection only temporary, as begins once coating becomes scratched. Thus, an increasingly common practice add microencapsulated chemical agents paint order confer self-healing capabilities. The additive's ability protect exposed surface from depends upon (i) how long agent takes spread across metal; (ii) form effective barrier layer; and (iii) what happens metal before first two steps are complete. To...
Two-dimensional condensed monolayers formed electrochemically on highly oriented pyrolitic graphite (HOPG) have been imaged using STM techniques. The formation process involves electrochemical adsorption followed by a phase transition to the state which is controlled electrode potential. resulting layered structures are well ordered and free of defects. In this work, electrochemistry layers briefly reviewed from thermodynamic perspective. Recent studies discussed shown confirm some earlier...
Three major causes of corrosion steel in concrete are chloride ions (Cl<SUP>-</SUP>), temperature (T) and acidity (pH). Under normal operating temperatures with pH above 13, does not undergo pitting corrosion. In presence Cl<SUP>-</SUP>, if the decreases below 12, probability increases. Acid rain atmospheric carbon dioxide cause to drop concrete, often leading structure concomitant cost repair or replacement. Currently, level is estimated through destructive testing structures. Glass ISFET,...
A fractal approach using corrugation data to calculate surface area is offered as an alternative gas adsorption technique. The surfaces of mechanically polished polycrystals pure Pt and PtRu(40%) alloy were examined scanning tunneling microscopy. Over a range 0.01–10 μm lengths, three dimensions identified. Measurements made at randomly selected locations separated by distances 0.1mm showed the existence domains everywhere. However, in each domain, dimensions, D, varied from one location...