Vijay Kumar is currently a postdoctoral research fellow in the Department of Physics at the University of the Free State. His current research interests are in rare-earth doped up-conversion nanomaterials. He has published more than 40 research papers in different peer reviewed international journals. Susheel Kalia is Associate Professor & Head of the Department of Chemistry at Army Cadet College Wing of the Indian Military Academy Dehradun. He was visiting researcher in the Department of Civil, Chemical, Environmental and Materials Engineering at University of Bologna, Italy, in 2013, and held a position as Assistant Professor in the Department of Chemistry, Bahra University, Solan, India until 2015. His research interests include polymeric composites, bio- and nanocomposites, conducting polymers, nanofibers, nanoparticles, hybrid materials, hydrogels, and cryogenics, and are documented in more than 65 research papers in international journals, over 80 conference contributions (incl. numerous invited contributions) and several book chapters. Kalia is an experienced book editor, and he has edited a number of successful books (with Springer), such as "Cellulose Fibers: Bio- and Nano-Polymer Composites", "Polymers at Cryogenic Temperatures", or "Polysaccharide Based Graft Copolymers". Hendrik C. Swart is senior professor in the Department of Physics at the University of the Free State. His research focus is on solid state luminescent and advanced materials, with a main objective to develop micro‐ and nanophosphors for applications in infrastructure and high technology flat panel displays.  He has more than 270 publications in international peer reviewed journals, 40 peer reviewed conference proceedings, and 3 book chapters and books as well as 400 national and international conference contributions.