The term ¿nanomaterials¿ has a particular meaning. ¿Nanomaterials¿ are materials at the nanoscale whose properties (such as conductivity, colour and mechanical hardness) change due to their nanoscale dimensions. ¿Nanomaterials¿ encompass all nanoscale materials or materials that contain at least one nanoscale structure, either on their surfaces or internally. They can be inorganic, organic or biological. Nanomaterials such as nanoplates, nanoparticles, nanowires and nanotubes can be engineered in labs. Nanomaterials can also occur in nature¿naturally occurring nanoparticles include smoke, sea spray and volcanic ash, as well as minerals, soils, salt particles and biogenic particles. Nanoparticles, nanowires, nanotubes and nanoplates are all types of nanomaterials, distinguished by their individual shapes and dimensions. Stability of the nanocrystalline materials synthesized by various processes is important for their possible technological applications. In order to obtain consolidated physical properties, these materials are treated under different environmental conditions.

The book on forensic science is the outcome of expertise of three authors: Dr. Sampa Dhabal [Assistant Director, Forensic Science Laboratory, Faculty of SVSPA, WB], Dr. Dhananjoy Saha [Deputy Director, West Bengal Technical Education Department, WB] & Dr. Dhrubo Jyoti Sen [Professor, School of Pharmacy, Techno India University, WB].