Laxman Singh is Head and Associate Professor at the Department of Chemistry, Siddharth University, Siddharthnagar, India, and has research and teaching experience in Materials Chemistry. He has published more than 60 research articles in well-reputed international science journals. Sunil Kumar is Senior Assistant Professor and Head of the Department of Chemistry at L.N.T. College, B.R.A. Bihar University, Muzaffarpur, India, and has seven years of teaching experience. His research interests include synthesis and processing of functional polyurethanes, redox polymers, gel polymer electrolytes, nanomaterials, composites and many others.