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Ganesan Ravi

Bio: Ganesan Ravi is an academic researcher from Alagappa University. The author has contributed to research in topics: Materials science & Nanorod. The author has an hindex of 32, co-authored 310 publications receiving 3942 citations. Previous affiliations of Ganesan Ravi include National Institute for Materials Science & Anna University.


Papers
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TL;DR: In this paper, composite polymer electrolyte (CPE) membranes, comprising of poly(vinylidene fluoride-hexafluoropropylene) (PVdF-HFP), aluminum oxyhydroxide, (AlO[OH]n) of two different particle sizes 7μm/14nm and LiN(CF3SO2)2 as lithium salt were prepared using solution casting technique.

204 citations

Journal ArticleDOI
TL;DR: The antibacterial studies performed against a set of bacterial strains showed that the Mg-doped ZnO NPs possessed a greater antibacterial effect than the other alkaline metal ion-doping Zn O NPs.
Abstract: Pure ZnO and alkaline metal ion (Mg2+, Ca2+, Sr2+ and Ba2+)-doped ZnO nanoparticles (NPs) were synthesized by the co-precipitation method. The synthesized nanoparticles retained the wurtzite hexagonal structure, which was confirmed by X-ray diffraction studies. The micro-strain properties were analyzed through Williamson–Hall analysis. The oxidation states of the elements (C (1s), O (1s), Zn (2p), Mg (1s), Ca (2p), Sr (3d) and Ba (3d)) were confirmed by XPS studies. HRSEM studies showed a reduction in the thickness of the ZnO nanoflakes from 63 to 47 nm after doping. EDAX studies determined the amount of dopant (alkaline metals) incorporated into the doped samples. The FT-IR spectra confirmed the Zn–O stretching bands at 432, 416, 414, 426 and 422 cm−1 for the respective ZnO NPs. The photoluminescence measurements revealed that the broad emission was composed of six different bands due to zinc and oxygen vacancies. Thermal analysis revealed that the irreversible structural transition occurred from the cubic phase to the wurtzite phase in the samples. The antibacterial studies performed against a set of bacterial strains showed that the Mg-doped ZnO NPs possessed a greater antibacterial effect than the other alkaline metal ion-doped ZnO NPs.

196 citations

Journal ArticleDOI
TL;DR: Gadolinium (Gd) doped zinc oxide (ZnO) nanoparticles (NPs) with hexagonal wurtzite structure was synthesized via a co-precipitation method as mentioned in this paper.

108 citations

Journal ArticleDOI
TL;DR: Ferrimagnetic cobalt ferrite (CoFe2O4) nanoparticles were synthesized by employing co-precipitation method as mentioned in this paper, and the product physico-chemical and magnetic properties with respect to cetyl trimethylammonium bromide (CTAB), hexamethylenetetramine (HMT) and polyethylene glycol (PEG-400) surfactants were investigated.
Abstract: Ferrimagnetic cobalt ferrite (CoFe2O4) nanoparticles were synthesized by employing co-precipitation method. Product physico-chemical and magnetic properties with respect to cetyl trimethylammonium bromide (CTAB), hexamethylenetetramine (HMT) and polyethylene glycol (PEG-400) surfactants were investigated. XRD pattern and Raman characteristic active modes revealed the cubic cobalt ferrite structure formation. SEM images explored spherical shaped product with different particle size. Identified strong PL emission peaks confirmed the product quality. IR metal oxygen vibration at 615 and 426 cm−1 revealed tetrahedral and octahedral site of cobalt ferrite system. Product electrochemical behavior was found to be size dependent and high specific capacitance was observed using CTAB. Room temperature ferrimagnetic behavior was confirmed through VSM studies. High saturation value as 66 emu/g was found using PEG. Particles with larger crystallite and particle size exhibited improved magnetic behavior.

106 citations

Journal ArticleDOI
TL;DR: In this paper, a new organic nonlinear material for which its solubility in methanol and acetone was found out using the apparatus fabricated by the authors, in order to get the good-quality crystals, methods of evaporation of solvent at room temperature and slow cooling of saturated solution at boiling temperature were adopted.

93 citations


Cited by
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Journal ArticleDOI
TL;DR: The 11th edition of Harrison's Principles of Internal Medicine welcomes Anthony Fauci to its editorial staff, in addition to more than 85 new contributors.
Abstract: The 11th edition of Harrison's Principles of Internal Medicine welcomes Anthony Fauci to its editorial staff, in addition to more than 85 new contributors. While the organization of the book is similar to previous editions, major emphasis has been placed on disorders that affect multiple organ systems. Important advances in genetics, immunology, and oncology are emphasized. Many chapters of the book have been rewritten and describe major advances in internal medicine. Subjects that received only a paragraph or two of attention in previous editions are now covered in entire chapters. Among the chapters that have been extensively revised are the chapters on infections in the compromised host, on skin rashes in infections, on many of the viral infections, including cytomegalovirus and Epstein-Barr virus, on sexually transmitted diseases, on diabetes mellitus, on disorders of bone and mineral metabolism, and on lymphadenopathy and splenomegaly. The major revisions in these chapters and many

6,968 citations

Journal ArticleDOI
TL;DR: Li-ion battery technology has become very important in recent years as these batteries show great promise as power sources that can lead us to the electric vehicle (EV) revolution as mentioned in this paper.
Abstract: Li-ion battery technology has become very important in recent years as these batteries show great promise as power sources that can lead us to the electric vehicle (EV) revolution. The development of new materials for Li-ion batteries is the focus of research in prominent groups in the field of materials science throughout the world. Li-ion batteries can be considered to be the most impressive success story of modern electrochemistry in the last two decades. They power most of today's portable devices, and seem to overcome the psychological barriers against the use of such high energy density devices on a larger scale for more demanding applications, such as EV. Since this field is advancing rapidly and attracting an increasing number of researchers, it is important to provide current and timely updates of this constantly changing technology. In this review, we describe the key aspects of Li-ion batteries: the basic science behind their operation, the most relevant components, anodes, cathodes, electrolyte solutions, as well as important future directions for R&D of advanced Li-ion batteries for demanding use, such as EV and load-leveling applications.

5,531 citations

01 Nov 2000
TL;DR: In this paper, the authors compared the power density characteristics of ultracapacitors and batteries with respect to the same charge/discharge efficiency, and showed that the battery can achieve energy densities of 10 Wh/kg or higher with a power density of 1.2 kW/kg.
Abstract: The science and technology of ultracapacitors are reviewed for a number of electrode materials, including carbon, mixed metal oxides, and conducting polymers. More work has been done using microporous carbons than with the other materials and most of the commercially available devices use carbon electrodes and an organic electrolytes. The energy density of these devices is 3¯5 Wh/kg with a power density of 300¯500 W/kg for high efficiency (90¯95%) charge/discharges. Projections of future developments using carbon indicate that energy densities of 10 Wh/kg or higher are likely with power densities of 1¯2 kW/kg. A key problem in the fabrication of these advanced devices is the bonding of the thin electrodes to a current collector such the contact resistance is less than 0.1 cm2. Special attention is given in the paper to comparing the power density characteristics of ultracapacitors and batteries. The comparisons should be made at the same charge/discharge efficiency.

2,437 citations

Journal ArticleDOI
TL;DR: This critical review presents an overview of the various classes of Li(+) conductors for use as electrolytes in lithium polymer batteries and all-solid state microbatteries and focuses on the physico-chemical and functional parameters relevant for optimal electrolytes preparation.
Abstract: This critical review presents an overview of the various classes of Li(+) conductors for use as electrolytes in lithium polymer batteries and all-solid state microbatteries. Initially, we recall the main models for ion transport and the structure-transport relationships at the basis of the observed conductivity behaviours. Emphasis is then placed on the physico-chemical and functional parameters relevant for optimal electrolytes preparation, as well as on the techniques of choice for their evaluation. Finally, the state of the art of polymer and ceramic electrolytes is reported, and the most interesting strategies for the future developments are described (121 references).

1,309 citations

Book
04 Jan 2005

644 citations