Abstract
Chemical thermodynamics and calorimetry are strongly expected to help nano-science and nanotechnology. Thermodynamic properties of nano-materials should be characterized as functions of size and their specific structures. In the nano-world, atoms and molecules self-organize nanostructures just by thermal energy. Nanotechnology needs a theoretical guide, which describes the self-organization and nano-crystal growth in terms of chemical bonds and chemical thermodynamics. DNA network is presented as an example of nanotechnology. DNA is modified with man-made materials which provide various functions. In this example, it is emphasized again that thermodynamic comprehension is necessary to control the formation of nanostructure.