Available online at www.sciencedirect.com ScienceDirect Materials Today: Proceedings 4 (2017) 11902–11909 www.materialstoday.com/proceedings 2214-7853 © 2017 Elsevier Ltd. All rights reserved. Selection and Peer-review under responsibility of INTERNATIONAL CONFERENCE ON NANOTECHNOLOGY (ICNANO-2016). ICNANO 2016 Synthesis and Characterization of as-formed and Calcined MnFe 2 O 4 nanoparticles: A comparative study of their Antibacterial Activities K. Ashwini a,b , H. Rajanaika a , K.S. Anantharaju b,c *, H. Nagabhushanad, P. Adinarayana Reddy b,c , Krushitha Shetty a,e , K.R. Vishnu Mahesh b,c a Department of Studies and Research in Environmental Science, Tumkur University, Tumkur 572103, India. b Dr.D.Premachandra Sagar Center for Advanced Materials, Dayananda Sagar College of Engineering, Bangalore 560078, India. c Department of Chemistry, Dayananda Sagar College of Engineering, Bangalore 560078, India. d Prof. C.N.R. Rao Centre for Advanced Materials, Tumkur University, Tumkur 572103, India. d Department of Nanotechnology, Visvesvaraya Technological University, VIAT, Muddenhalli, Chikkaballapur 562101, India. Abstract In this study, MnFe 2 O 4 NPs were synthesized through Solution combustion method at a temperature of about 450˚C using Oxalyl Dihydrazide (ODH) as a chemical fuel. The synthesized MnFe 2 O 4 nanomaterial was calcined at a temperature of 700˚C. The structural properties and surface morphology of the synthesized NPs were characterized by Powder X-ray Diffraction technique (PXRD) and Scanning Electron Microscopy (SEM). Further these NPs were subjected to antibacterial studies with different strains of Gram-positive and Gram-negative bacteria by Agar well diffusion method and Microbroth dilution technique. The comparison between the bacterial inhibition potential of the synthesized NPs were investigated by the zone of inhibition obtained around the agar wells and the colour change obtained in the titre plate wells containing the bacterial suspension with respect to different concentrations of the as-formed and calcined MnFe 2 O 4 NPs. © 2017 Elsevier Ltd. All rights reserved. Selection and Peer-review under responsibility of INTERNATIONAL CONFERENCE ON NANOTECHNOLOGY (ICNANO- 2016). Keywords: MnFe 2 O 4 NPs; Solution combustion method; Calcined; Antibacterial activity; Agar well diffusion method; Microbroth dilution technique. * Corresponding author. E-mail address: ananth.che@gmail.com