Prof. Dr. Ravi Kumar
Indian Institute of Technology Madras (IITM), India
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Academic Career Length
23Years (2004-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications7 May 2023 in Small Methods
Journal Article
ATAnupma Thakur
Anupma Thakur
NBNithin Chandran B.S.
Nithin Chandran B.S.
KDKaris Davidson
Karis Davidson
ABAnnabelle Bedford
Annabelle Bedford
HFHui Fang
Hui Fang
Babak Anasori +7
To advance the MXene field, it is crucial to optimize each step of the synthesis process and create a detailed, systematic guide for synthesizing high‐quality MXene that can be consistently reproduced. In this study, a detailed guide is provided for an optimized synthesis of titanium carbide (Ti3C2Tx) MXene using a mixture of hydrofluoric and hydrochloric acids for the selective etching of the stoichimetric‐Ti3AlC2 MAX phase and delamination of the etched multilayered Ti3C2Tx MXene using lithium chloride at 65 °C for 1 h with argon bubbling. The effect of different synthesis variables is investigated, including the stoichiometry of the mixed powders to synthesize Ti3AlC2, pre‐etch impurity removal conditions, selective etching, storage, and drying of MXene multilayer powder, and the subsequent delamination conditions. The synthesis yield and the MXene film electrical conductivity are used as the two parameters to evaluate the MXene quality. Also the MXenes are characterized with scanning electron microscopy, x‐ray diffraction, atomic force microscopy, and ellipsometry. The Ti3C2Tx film made via the optimized method shows electrical conductivity as high as ≈21,000 S/cm with a synthesis yield of up to 38 %. A detailed protocol is also provided for the Ti3C2Tx MXene synthesis as the supporting information for this study.
3 April 2018 in Scientific Reports
Journal Article
STSri Ramya Teeparthi
Sri Ramya Teeparthi
EAEranezhuth Wasan Awin
Eranezhuth Wasan Awin
Ravi KumarNanometric powder particles of white zirconia were synthesized through precursor route by the pyrolysis of zirconium (IV) butoxide at varied temperatures in air ranging from 900–1400 °C and were predominantly monoclinic in nature. To control the defect chemistry, the precursor was also pyrolyzed in a reduced atmosphere at 900 °C, eventually resulting in black zirconia. The stabilization of tetragonal phase and observed color change from white to black in samples pyrolyzed under reduced atmosphere was attributed to the creation of oxygen vacancies and disorder. The black and white zirconia produced delineated the influence of crystal structure and oxygen vacancies on the photocatalytic performance. Furthermore, zirconia synthesized at lower temperatures (600 and 800 °C) in air confirmed the detrimental role of tetragonal phase on the degradation behavior of methylene blue dye. High photocatalytic degradation rate for white zirconia was attributed to the presence of increased density of nano-sized pores and low recombination rate of electron-hole pairs as confirmed by PL measurements. Interestingly, black zirconia exemplified relatively limited activity albeit presence of oxygen vacancies. This negative effect was attributed to the presence of tetragonal phase and possibly, the insufficient creation of new energy states near valence and conduction band towards Fermi energy level.
1 September 2011 in Materials & Design (1980-2015)
Journal Article
CSC. Swetha
C. Swetha
Ravi Kumar28 June 2020 in International Materials Reviews
Journal Article
RSRavindran Sujith
Ravindran SujithSJSudagar Jothi
Sudagar JothiAZAndre Zimmermann
Andre ZimmermannFAFritz Aldinger
Fritz Aldinger
Ravi KumarSince the last five decades, polymer-derived ceramics (PDCs) are in use and envisaged for a variety of applications. The transition of a precursor to an inorganic ceramic by pyrolysis and heat-treatment results in either amorphous or nanocrystalline composites with the evolution of phases strongly controlled by the processing conditions. Understanding the deformation behaviour under ambient conditions and at elevated temperatures is key to designing these materials for long-term use. However, quantitative reliable estimation of mechanical properties is quite challenging due to its unique structure which in turn is strongly governed by the precursor chemistry. The mechanical behaviour of PDCs in the form of fibres, bulk and foams are different and they are discussed separately. Both experimental and simulation-based studies are considered in this review. Recently, additive manufacturing processes have been used for the fabrication of PDCs, the mechanical properties of which are also included in this review.
1 October 2005 in Acta Materialia
Journal Article
Ravi KumarSPSabine Prinz
Sabine Prinz
YCYe Cai
Ye Cai
AZAndré Zimmermann
André Zimmermann
FAFritz Aldinger
Fritz Aldinger
KMKlaus Müller
Klaus Müller
+1
1 November 2006 in Journal of Materials Science
Journal Article
Ravi KumarYCY. Cai
Y. Cai
PGP. Gerstel
P. Gerstel
GRG. Rixecker
G. Rixecker
FAF. Aldinger
F. Aldinger
About Me
Dr. rer. nat. Ravi Kumar obtained his doctorate in natural sciences from the Max Planck Institute for Metals Research (currently known as Max Planck Institute for Intelligent Systems), Stuttgart, Germany in 2004 with a “Sehr gut” grade (very good) with a fellowship from the Max Planck Institute. Subsequently, he continued in the same institute as a postdoctoral researcher and guest scientist. He worked on the high temperature deformation behavior of polymer precursor derived ceramics during his stay. After 6 years of stay at the Max Planck Institute, he moved to the Institute for Shock Physics in Pullman, USA and worked on the dynamic response of bulk metallic glasses for a brief period. He returned back to India in 2007 and joined the Dept of Metallurgical and Materials Engg., at IIT Madras as an Asst. Professor. Since 2012, he worked in the same department as Associate Professor and heads the Central XRD Laboratory. He is currently professor of ceramics in the Dept of Metallurgical and Materials Engineering at IIT Madras since 2018. As head of the Central XRD Laboratory he consults a large number of industries both in India and abroad. His professional experience includes working for ISRO Satellite Centre in Bangalore, Dept of Space, Govt of India. He has published more than 75 peer-reviewed international papers and delivered several prestigious invited lectures in India, Europe and US.