Sibnath Kayal
@opju.ac.in
Professor, Department of Metallurgical Engineering
O. P. Jindal University
Dr. Sibnath Kayal completed B.Tech in Chemical Technology from University of Calcutta, M.Tech in Materials Science and Engineering from Indian Institute of Technology (IIT), Kharagpur and PhD in Materials Science and Engineering from Nanyang Technological University (NTU), Singapore. Dr. Kayal has 8 years of teaching, 17 years of research and 2 years of industrial experience.
EDUCATION
Ph.D. (2011): Materials Science and Engineering, Nanyang Technological University (NTU), Singapore
M.Tech. (2004): Materials Science and Engineering, Indian Institute of Technology (IIT), Kharagpur, India, 1st Class CGPA: 9.53/10 (Rank: First)
B.Tech. (2002): Chemical Technology, University of Calcutta, Kolkata, India, 1st Class
RESEARCH INTERESTS
Advanced Materials, Nanomaterials : Synthesis, Characterization and Property Evaluation
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Saikat Biswas, Mahima Jha, Sibnath Kayal, Partho S. G. Pattader, and Tapas K. Mandal
Wiley
Abstract2D simulations have been performed to investigate flow regimes in a flow‐focusing geometry by changing the dispersed phase and continuous phase velocities. The dispersed phase is polydimethylsiloxane (PDMS), and the continuous phase is water. Simulations have been performed in a range of oil–water viscosity ratio from 3 to 50, and interfacial tension ranges from 0.0118 to 0.002 N/m. The walls of the microchannel are considered to be poly(methyl methacrylate) (PMMA) surfaces. The contact angle (θ) of an oil droplet in the presence of water wetting the PMMA surface is 140°. Our study observed two types of flow regimes, namely dripping and jetting, by changing the dispersed phase and continuous phase velocities. The sequential time steps of void fraction contour have been presented to explore the droplet formation mechanism. The droplet pinch‐off time and jet growth time have been calculated for the dripping and jetting regime, respectively. The outcomes are summarized in the form of a flow pattern map at a viscosity ratio of 12 and interfacial tension of 0.0118 N/m, which shows the transition boundary between dripping and jetting phenomena. The simulated transition boundary agrees well with the analytical solution available in the literature. The effect of oil–water viscosity ratio and interfacial tension on droplet size is also investigated. These findings will help understand different flow regimes and their transition in a flow focusing geometry and will directly apply to microfluidic platform‐based devices.
Ayushi Singh and Sibnath Kayal
Pleiades Publishing Ltd
Ayushi Singh and Sibnath Kayal
Springer Science and Business Media LLC
Sibnath Kayal and Anutosh Chakraborty
Elsevier BV
Adityakumar Mishra and Sibnath Kayal
SAGE Publications
The present study is aimed to eliminate the undesirable microstructure in the real working condition of the steel unit. In this work, the microstructure of hot-rolled medium carbon steel (grade 45C8) is studied for application in the automotive industry. The effect of the temperature and rolling rate on the microstructure has been thoroughly investigated by analyzing the microstructure containing ferrite and pearlite phases after each trial run of hot-rolled steel. The desired microstructure of fine ferrite and pearlite is very much essential in hot-rolled medium carbon steel for better strength and uniform properties of the material. The formation of coarse pearlite is undesirable, which may lead to breakage during drawing and hardness variation in the hot-rolled steel. Therefore, this study is focused to find the optimum condition for achieving the microstructure containing uniform distribution of fine pearlite and ferrite without the presence of blocky pearlite patches.
Ayushi Singh and Sibnath Kayal
Bentham Science Publishers Ltd.
Background: In today’s world, rising temperature due to global warming is caused by higher concentration of carbon dioxide (CO2) emissions in the atmosphere. Metal-Organic Framework (MOF) materials have the potential to be used in carbon dioxide capture and utilization technology. Objective: The purpose of this work is to prepare metal-organic framework materials by a benign synthesis method using water as the solvent, followed by the characterization and property evaluation for CO2 adsorption study. Methods: MIL-101-Cr metal-organic framework and its derivatives with alkali ion dopants were prepared by benign hydrothermal synthesis route, which were characterized by powder X-ray diffraction method. The adsorption isotherms of CO2 for MIL-101-Cr and its derivatives were studied to comprehend the influence of alkali dopants on CO2 sorption behaviour. The equilibrium uptakes of CO2 were further evaluated by fitting the isotherms with Langmuir, Toth and Dubinin – Astakohv adsorption models to determine the adsorption parameters. Results: The crystalline structural integrity of MIL-101-Cr is not affected by doping with alkali ions. The isosteric heat of CO2 adsorption is diminished with an increase in alkali dopant size, while the induced surface structural heterogeneity increases with increasing alkali dopant size. Conclusion: The equilibrium and thermodynamic parameters calculated from this study are useful for applications in carbon dioxide capture and utilization technology.
Sibnath Kayal
Elsevier BV
How Wei Benjamin Teo, Anutosh Chakraborty, and Sibnath Kayal
Elsevier BV
Sibnath Kayal and Anutosh Chakraborty
Wiley
In this article, an assessment of the impact of alkali-metal-ion impregnation on metal-organic frameworks (MOF) is presented employing CH4 and CO2 adsorption isotherm data. At first, the parent MOF, MIL-101(Cr), is prepared by a fluorine-free hydrothermal reaction procedure and impregnated with Li, Na, and K alkali cations. These synthesised MOFs are characterized by N2 adsorption/desorption isotherm analysis, X-ray diffraction (XRD) measurement and scanning electron microscopy (SEM). The amount of CH4 and CO2 adsorption uptakes onto parent and alkali ions impregnated MIL-101(Cr) are conducted for wide ranges of pressures and temperatures. For understanding the effects of MOF synthesis process and alkali cations impregnation, CH4 /CO2 uptakes on perfect crystalline MIL-101(Cr) MOF are also calculated by Grand Canonical Monte Carlo (GCMC) simulation and the results are compared with experimental isotherm data of synthesised parent and alkali ions impregnated MIL-101(Cr) MOFs. It is found that the limiting uptakes and the isosteric heats are mainly influenced by the modified adsorbent structures due to alkali ions impregnation and the polarity of adsorbate molecules. Employing Dubinin-Astakhov (DA) equation, the energy distribution of synthesised parent and alkali doped MIL-101 (Cr) MOFs are also presented to identify the alkali cation effects and the surface heterogeneity.
Sibnath Kayal, Anutosh Chakraborty, and How Wei Benjamin Teo
Elsevier BV
Sibnath Kayal and Anutosh Chakraborty
Elsevier BV
How Wei Benjamin Teo, Anutosh Chakraborty, and Sibnath Kayal
Elsevier BV
How Wei Benjamin Teo, Anutosh Chakraborty, Yuji Kitagawa, and Sibnath Kayal
Elsevier BV
How Wei Benjamin Teo, Anutosh Chakraborty, and Sibnath Kayal
Elsevier BV
Sibnath Kayal, How Wei Benjamin Teo, and Anutosh Chakraborty
Elsevier BV
Wu Fan, Anutosh Chakraborty, and Sibnath Kayal
Elsevier BV
Baichuan Sun, Anutosh Chakraborty, Syed Muztuza Ali, and Sibnath Kayal
Elsevier BV
Sibnath Kayal, Sun Baichuan, and Bidyut Baran Saha
Elsevier BV
Sibnath Kayal, Baichuan Sun, and Anutosh Chakraborty
Elsevier BV
Baichuan Sun, Sibnath Kayal, and Anutosh Chakraborty
Elsevier BV
Sibnath Kayal, Dipankar Bandyopadhyay, Tapas Kumar Mandal, and Raju V. Ramanujan
Royal Society of Chemistry (RSC)
Magnetic drug targeting has been explored by an in vitro study of the deposition of polyvinyl alcohol (PVA) coated magnetic carrier nanoparticles (MCNPs) in a tube under the influence of an externally applied magnetic field. Experiments and simulations show a steady decrease in the retention of MCNPs with increasing flow rate and weaker magnetic field strength. The retention of MCNPs has been significantly influenced by the fluid flow behaviour resulting from the position and shape of the magnet, magnetic properties and size of the MCNPs, and the magnetic field strength. Under strong magnetic fields, the MCNPs tend to creep along the wall of the tube and undergo high shear before reaching the targeted region. These results highlight the importance of choosing the region of MCNP injection, magnetic field strength and, the magnetic properties and size of the MCNPs to minimize the loss of the drug.
D. Ang, Q.V. Nguyen, S. Kayal, P.R. Preiser, R.S. Rawat, and R.V. Ramanujan
Elsevier BV
Sibnath Kayal and Raju Vijayaraghavan Ramanujan
American Scientific Publishers
Magnetic drug targeting, using core-shell magnetic carrier particles loaded with anti-cancer drugs, is an emerging and significant method of cancer treatment. Gold shell-iron core nanoparticles (Fe@Au) were synthesized by the reverse micelle method with aqueous reactants, surfactant, co-surfactant and oil phase. XRD, XPS, TEM and magnetic property measurements were utilized to characterize these core-shell nanoparticles. Magnetic measurements showed that the particles were superparamagnetic at room temperature and that the saturation magnetization decreased with increasing gold concentration. The anti-cancer drug doxorubicin (DOX) was loaded onto these Fe@Au nanoparticle carriers and the drug release profiles showed that upto 25% of adsorbed drug was released in 80 h. It was found that the amine (-NH2) group of DOX binds to the gold shell. An in vitro apparatus simulating the human circulatory system was used to determine the retention of these nanoparticle carriers when exposed to an external magnetic field. A high percentage of magnetic carriers could be retained for physiologically relevant flow speeds of fluid. The present findings show that DOX loaded gold coated iron nanoparticles are promising for magnetically targeted drug delivery.
S. Kayal and R.V. Ramanujan
Elsevier BV