P. Sivakumar

St. Peter's Institute of Higher Education and Research

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P. N. Palanisamy

Madurai Medical College

S. Israel

American College, Madurai

G. Chakkaravarthi

CPCL Polytechnic College

S. Sudhahar

Alagappa University

M. Asaithambi

G.S. Science, Arts And Commerce College

J. Raffiea Baseri

Iran University of Science and Technology

A. Agalya

Anna University, Chennai

Akella Srikanth

Vellore Institute of Technology University

Archana Loganathan

Tun Hussein Onn University of Malaysia

P. Madhu

Bharathiar University

Cooperative Institutions

Tamil Nadu Agricultural University

Annamalai University

Bharathiar University

SRM Institute of Science and Technology

Anna University, Chennai

Alagappa University

Indian Institute of Technology Madras

St. Peter's Institute of Higher Education and Research

University of Madras

Vellore Institute of Technology University

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ADSORPTION OF REACTIVE DYE BY A NOVEL ACTIVATED CARBON PREPARED FROM THEVETIA PERUVIANA

International Journal of Chemistry (2012)

J. Raffiea Baseri P. N. Palanisamy P. Sivakumar

This investigation was to evaluate the adsorption capability of activated carbon prepared from Thevetia Peruviana wood for removal of reactivetextile dye (RO4) from aqueous solution. Batch adsorption experiments were performed as a function of initial dye concentration, contact time,temperature and pH. The amount of dye adsorbed increased while increasing the initial concentration and temperature of the solution. Theexperimental data fitted well to Pseudo second order kinetic model with Intra particle diffusion as the rate determining step. Adsorption data fittedwith Langmuir model. The negative value of Gibb’s free energy (∆G°) indicated that the adsorption was spontaneous in nature. The results showedthat the activated carbon of Thevetia Peruviana was suitable for the removal of the reactive dyes from the aqueous solutions. The positive value ofenthalpy (∆H° ) indicated that the adsorption of the selected dyes were endothermic.

Endothermic process

Langmuir adsorption model

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Citations (15)

Normal co-ordinate analysis of CH2F2 and CD2F2—kinetic constants and optimisation technique

Proceedings / Indian Academy of Sciences (1980)

P. Sivakumar C. Subramanian B. Krishna Rao Parthiban Ramasamy

Distortion (music)

Ordinate

Coupling constant

Constant (computer programming)

10.1007/bf02842145

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Influence of doping concentrations of Hf on structural and electrical properties of HfxZn1-xO thin films

Journal of Ovonic Research (2023)

P. Sateesh M. Saritha N. Hemanthkumar T. Satya B. Hemachandrarao

HfxZn1−xO thin films (x=0, 2.5,3, 7.5, 10 and 15mol %) were deposited on glass substrates using Sol-gel process. The influence of the Hf concentration on the structural, electrical, and optical properties of the films was studied. It is found that Hf ions can be effectively doped into ZnO and all films crystallize in the hexagonal wurtzite structure with a preferred c-axis orientation. The lattice constants of HfxZn1−xO films increase with the Hf contents. The HfxZn1−xO thin films structures of high-Hf-content films remain after annealing at 600 °C for 20 min. The optical band gap increases with the Hf content, but it decreases with the annealing temperature. The reduction of bandgap partly results from grain growth, which is due to the quantum confinement effect of the small grains. Hf doping increases the resistivity of ZnO owing to the disorder of the material structure and the higher bandgap, which results in more carrier traps and less thermally excited carriers in the conduction bands. Two FTIR peaks centered at about 1432 and 1056 cm-1 coexist in the fluorescent spectra. With increasing the Hf contents, the intensity of fluorescent peaks enhances remarkably. The Minimum resistivity reached 6.1 * 10-2 Ὠ cm after annealing with 3% Hf content.

Wurtzite crystal structure

Lattice constant

10.15251/jor.2023.194.401

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Carbon Fiber Composites: A Solution for Light Weight Dynamic Components of AFVs

Defence Science Journal (2017)

Subodh Kumar Nirala Sarath Shankar Dhanalakshmi Sathishkumar V. Kavivalluvan P. Sivakumar

<p class="p1">Changing circumstances across the world require armored fighting vehicle (AFV) of a country to be more agile, easily manoeuverable and transportable besides other key requirements like firepower and protection. Therefore, the AFV should be as light as possible. The use of conventional materials and techniques do not fulfill the requirement of light weight AFV. The composite materials having high specific modulus, specific strength and directional properties are the alternative substitution for reducing the weight. A customized design approach with proper selection of composite material is essential to make AFV components with required properties at lower weight as compared to the traditional approach. Special properties like resistance to moisture, solvents, UV degradation etc. could be imparted to the composite components by the use of proper additives or fillers. This paper deals with the development of dynamic members like road wheel, top roller and axle arm, whose count is always more in any AFVs, using carbon-epoxy composite material. The details of composite materials used and the manufacturing processes adopted are briefly discussed. The static load test carried out to assess the structural integrity as well as non-destructive tests (NDT) performed to detect the defects are also dealt in detail. Preliminary Finite Element Analysis and Multi-body Dynamic Analysis have also been discussed. These analyses have been done mainly to understand the sustainability and performance of the components developed under the given loading conditions.</p>

Specific modulus

Carbon fiber composite

10.14429/dsj.67.11541

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Citations (6)

Anticorrosive Activity of Schreabera swietenioids Leaves as Green Inhibitor for Mild Steel in Acidic Solution

Asian Journal of Chemistry (2016)

P. Sivakumar Akella Srikanth

10.14233/ajchem.2017.20160

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Citations (9)

Equilibrium uptake and sorption dynamics for the removal of reactive dyes from aqueous solution using activated carbon prepared from E uphorbia tirucalli L wood

P. N. Palanisamy A. Agalya P. Sivakumar

Received 21 June 2011; accepted 5 May 2013 Activated carbon prepared from Euphorbia tirucalli L wood (ETAC) by chemical activation with phosphoric acid has been analysed for the removal of Reactive Red and Reactive Blue dyes from aqueous solutions through batch adsorption technique. Lower solution pH favours the adsorption of reactive dyes. The amount of dye adsorbed per unit mass of adsorbent increases with the increase in temperature and initial dye concentration. Freundlich and Langmuir models are used to analyze the equilibrium data at different temperatures. The equilibrium data for the adsorption of both dyes are better described by the Langmuir isotherm model. The adsorption of reactive dyes follows second order kinetics along with intra-particle diffusion model. Thermodynamic parameters such as free energy change, enthalpy change and entropy change for adsorption of reactive dyes show that the adsorption of Reactive Red and Reactive Blue onto ETAC are spontaneous, endothermic and physical adsorption. Activation energy and isosteric heat of adsorption suggests that adsorption of reactive dyes onto ETAC is a physical process.

Reactive dye

Endothermic process

Langmuir adsorption model

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PRODUCTION AND CHARACTERIZATION OF A NOVEL NON-CONVENTIONAL LOW-COST ADSORBENT FROM EUPHORBIA ANTIQUORUM L

P. N. Palanisamy P. Sivakumar

Activated carbon samples are characterized by their high adsorption capacities. Although the highly active surface properties of the activated carbon are attributed to the chemical functional groups. Surface morphology also plays a significant role in the adsorption properties along with surface functional groups. In this study, the influence of activation methods on the preparation of activated carbon from Euphorbia antiquorum L wood was studied. The resulting samples were analyzed for their physico-chemical characteristics. The results indicate that an activated carbon with high adsorptive properties can be conveniently prepared from Euphorbia antiquorum L wood. Impregnation with H3PO4 solution process followed by activation at 800° C yields activated carbon with the highest surface area and more developed porosity. Suitability of the potential adsorbent was analyzed for the various categories of synthetic dye solutions.

Carbon fibers

Characterization

Specific surface area

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Proline Suppresses Rubisco Activity by Dissociating Small Subunits from Holoenzyme

Biochemical and Biophysical Research Communications (2001)

P. Sivakumar P. Sharmila P. Pardha Saradhi

Histone octamer

10.1006/bbrc.2001.4540

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