Mohammed Harun Chakrabarti
University of Malaya
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Featured researches published by Mohammed Harun Chakrabarti.
Materials | 2014
Ahmad Shamiri; Mohammed Harun Chakrabarti; Shah Jahan; Mohd Azlan Hussain; Walter Kaminsky; P.V. Aravind; Wageeh A. Yehye
50 years ago, Karl Ziegler and Giulio Natta were awarded the Nobel Prize for their discovery of the catalytic polymerization of ethylene and propylene using titanium compounds and aluminum-alkyls as co-catalysts. Polyolefins have grown to become one of the biggest of all produced polymers. New metallocene/methylaluminoxane (MAO) catalysts open the possibility to synthesize polymers with highly defined microstructure, tacticity, and steroregularity, as well as long-chain branched, or blocky copolymers with excellent properties. This improvement in polymerization is possible due to the single active sites available on the metallocene catalysts in contrast to their traditional counterparts. Moreover, these catalysts, half titanocenes/MAO, zirconocenes, and other single site catalysts can control various important parameters, such as co-monomer distribution, molecular weight, molecular weight distribution, molecular architecture, stereo-specificity, degree of linearity, and branching of the polymer. However, in most cases research in this area has reduced academia as olefin polymerization has seen significant advancements in the industries. Therefore, this paper aims to further motivate interest in polyolefin research in academia by highlighting promising and open areas for the future.
International Journal of Green Energy | 2011
Chulheung Bae; E.P.L. Roberts; Mohammed Harun Chakrabarti; Muhammad Saleem
The charge/discharge characteristics of an undivided redox flow battery, using porous electrodes and chromium-EDTA electrolyte are discussed. The results indicate that a high current efficiency can be achieved using this system with single pass, flow through electrodes. With 0.2 M electrolytes and a charging current density of 30 mA cm−2, 100% current efficiency was achieved with 48% conversion of Cr(III) to Cr(II). However, the overall energy efficiency of charge/discharge of this redox flow battery was less than 7%. The results suggest that this poor efficiency was associated with the slow kinetics and consequently large overpotential of the Cr(V)-EDTA/Cr(III)-EDTA redox couple.
PLOS ONE | 2015
Laleh Bahadori; Mohammed Harun Chakrabarti; Ninie Suhana Abdul Manan; Mohd Ali Hashim; Farouq S. Mjalli; Inas M. AlNashef; Nigel P. Brandon
The temperature dependence of the density, dynamic viscosity and ionic conductivity of several deep eutectic solvents (DESs) containing ammonium-based salts and hydrogen bond donvnors (polyol type) are investigated. The temperature-dependent electrolyte viscosity as a function of molar conductivity is correlated by means of Walden’s rule. The oxidation of ferrocene (Fc/Fc+) and reduction of cobaltocenium (Cc+/Cc) at different temperatures are studied by cyclic voltammetry and potential-step chronoamperometry in DESs. For most DESs, chronoamperometric transients are demonstrated to fit an Arrhenius-type relation to give activation energies for the diffusion of redox couples at different temperatures. The temperature dependence of the measured conductivities of DES1 and DES2 are better correlated with the Vogel-Tamman-Fulcher equation. The kinetics of the Fc/Fc+ and Cc+/Cc electrochemical systems have been investigated over a temperature range from 298 to 338 K. The heterogeneous electron transfer rate constant is then calculated at different temperatures by means of a logarithmic analysis. The glycerol-based DES (DES5) appears suitable for further testing in electrochemical energy storage devices.
Journal of The Electrochemical Society | 2011
Maria Skyllas-Kazacos; Mohammed Harun Chakrabarti; Seyedahmad Hajimolana; Farouq S. Mjalli; Muhammad Saleem
Carbon | 2013
C.T.J. Low; Frank C. Walsh; Mohammed Harun Chakrabarti; Mohd Ali Hashim; Mohamed Azlan Hussain
Renewable & Sustainable Energy Reviews | 2012
Leila Emami Taba; Muhammad Irfan; Wan Ashri Mohd Wan Daud; Mohammed Harun Chakrabarti
Journal of Power Sources | 2014
Mohammed Harun Chakrabarti; Nigel P. Brandon; Seyedahmad Hajimolana; Farid Tariq; Vladimir Yufit; Mohd Ali Hashim; Mohamed Azlan Hussain; C.T.J. Low; P.V. Aravind
Renewable & Sustainable Energy Reviews | 2014
Mohammed Harun Chakrabarti; Farouq S. Mjalli; Inas M. AlNashef; Mohd Ali Hashim; Mohd Azlan Hussain; Laleh Bahadori; C.T.J. Low
Electrochimica Acta | 2013
Mohammed Harun Chakrabarti; C.T.J. Low; Nigel P. Brandon; Vladimir Yufit; Mohd Ali Hashim; M.F. Irfan; J. Akhtar; Enrique Ruiz-Trejo; Mohamed Azlan Hussain
Energy Conversion and Management | 2011
Mohammed Harun Chakrabarti; E.P.L. Roberts; Chulheung Bae; Muhammad Saleem