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Exciting developments are taking place in the field of Nano materials & their joining techniques. Nanotechnology, as we all know, involves working with materials at the nanometer level, that is tens of atoms, to create structures, devices and systems that have useful and unique new properties. Many material properties change dramatically when they are very small (when their surface area gets very large compared to their volume). This can change optical, electrical and magnetic properties, to name a few. For instance, opaque substances become transparent (copper); inert materials become catalysts (platinum), stable materials turn combustible (aluminum); solids turn into liquids at room temperature (gold); insulators become conductors (silicon).