Qualification: 
Ph.D, MSc
ak_nandakumar@cb.amrita.edu

Dr. A. K. Nanda Kumar currently serves as Assistant Professor (Sr. Gr.) in Physics, Department of Sciences, Amrita School of Engineering, Coimbatore.

He graduated with a masters in Materials Science and a PhD in Applied Physics awarded from Anna University. During his post doctoral training, he was introduced to the Transmission Electron Microscope for microstructural analyses of metals and ceramics – an instrument that has been his primary research tool in the study of ceramics, steels and ionic conductors. In addition to the teaching routine here, he also make time to continue his research on ionic conductors and ceramics processing with help from the masters students here.

Qualification

  • 2008: Ph. D.
    PSG Tech. (Anna University)
  • 2002: M.Sc. Materials Science
    Anna University, Guindy campus
  • 2000: B.Sc. Physics
    Sacred Heart College, Tirupatturz

Funded project

Year Sponsor Title of the project Grant sanctioned Investigators Status
2020 DST-SERB Development of a basic Flash Sintering set-up 23,0000/- INR A K Nanda Kumar On going

Teaching

  • UG theory
    • Basic Experimental Technique
    • Introduction to Mathematical Physics
    • Introductory Computational Physics
  • PG/Ph.D theory
    • Experimental Techniques
  • UG labs
    • Modern Physics Lab
  • PG labs
    • Physics lab

Publications

Publication Type: Journal Article

Year of Publication Title

2020

D. Bosubabu, Ette, P. Masthanaia, Dr. A. K. Nanda Kumar, Arulraj, A., and Ramesha, K., “Proliferation of Atomic Shuffling through Mechanical Stress on Cationic Disorder Li4FeMoO6 as a Cathode Material for a Lithium-Ion Battery”, ACS Applied Energy MaterialsACS Applied Energy Materials, vol. 3, no. 9, pp. 8716 - 8724, 2020.[Abstract]


The cation-disordered lithium metal oxides display interesting electrochemical behavior quite distinct from the conventional cation-ordered layered structures. Comprehending the structure–property relations in these cation-disordered oxides is still in the preliminary stage. Herein, we report evidence of structural instabilities upon mechanical milling and electrochemical cycling of Li4FeMoO6. Remarkably, even under normal ball-milling conditions, the material becomes atomically disordered/the long-range order is severely affected. X-ray and electron diffraction studies reveal that pristine cationic disordered Li4FeMoO6 adopts the C2/m structure with stacking faults, whereas upon ball milling, a biphasic structure comprising a cubic phase (Fm3̅m + R3̅m) develops. With increasing milling time, these phases still coexist but as nanoscale domains (<5 nm); the 3 h ball-milled sample shows almost a 90.4% cubic (Fm3̅m) phase. Concomitant to ball milling, a dramatic improvement in charge–discharge capacities is also observed. The prepared sample Li4FeMoO6 showed a modest discharge capacity of 140 mA h g–1, whereas the 3 h ball-milled sample showed a discharge capacity of 359 mA h g–1, reaching 91.5% of its theoretical capacity. This unusual observation is a result of Li-ion percolation pathways (0-TM channels) introduced by the milling process.The cation-disordered lithium metal oxides display interesting electrochemical behavior quite distinct from the conventional cation-ordered layered structures. Comprehending the structure–property relations in these cation-disordered oxides is still in the preliminary stage. Herein, we report evidence of structural instabilities upon mechanical milling and electrochemical cycling of Li4FeMoO6. Remarkably, even under normal ball-milling conditions, the material becomes atomically disordered/the long-range order is severely affected. X-ray and electron diffraction studies reveal that pristine cationic disordered Li4FeMoO6 adopts the C2/m structure with stacking faults, whereas upon ball milling, a biphasic structure comprising a cubic phase (Fm3̅m + R3̅m) develops. With increasing milling time, these phases still coexist but as nanoscale domains (<5 nm); the 3 h ball-milled sample shows almost a 90.4% cubic (Fm3̅m) phase. Concomitant to ball milling, a dramatic improvement in charge–discharge capacities is also observed. The prepared sample Li4FeMoO6 showed a modest discharge capacity of 140 mA h g–1, whereas the 3 h ball-milled sample showed a discharge capacity of 359 mA h g–1, reaching 91.5% of its theoretical capacity. This unusual observation is a result of Li-ion percolation pathways (0-TM channels) introduced by the milling process.

More »»

2020

M. Roshith, Pathak, A., Dr. A. K. Nanda Kumar, Anantharaj, G., Saranyan, V., Dr. S. Ramasubramanian, Dr. Satheesh Babu T. G., and Kumar, D. V. Ravi, “Continuous flow solar photocatalytic disinfection of E. coli using red phosphorus immobilized capillaries as optofluidic reactors”, Applied Surface Science, vol. 540, p. 148398, 2020.[Abstract]


An elemental, non-metallic red phosphorus-based photocatalyst for potential continuous flow disinfection of water is reported. The crystalline red phosphorus is immobilized by a solid state method on the inner walls of a quartz capillary tube and a continuous flow photocatalytic disinfection of E. coli solution under direct sunlight is demonstrated using the set-up as an optofluidic reactor. Structural and microstructural analyses employing electron diffraction confirms the fibrous phase of the immobilized red phosphorus. The reactor with the immobilized photocatalyst when tested under direct sunlight resulted in a 6.7 log reduction (>99.9999% reduction) in the concentration of E. coli bacteria within 14 min. The sample aliquot collected at 28 min residence time did not yield any visible colonies indicating the high efficiency of the process. The demonstrated efficiency suggests great potential for commercial scale-up.

More »»

Invited talks

  1. Resource person for the one-day workshop, “Hands-on training on the interpretation of Electrochemical Impedance and TEM data”organized by the PG & Research Dept. of Chemistry, Lady Doak College, Madurai on 24th January, 2019.
  2. Resource person for National Seminar on “Impact of nanotechnology in engineering aplications”organized by the Dept. of Sciences & Humanities, Karpagam Academy of Higher Education on 15th October, 2019.