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A simple model is proposed to understand the size and shape dependence of cohesive energy of nanoparticles. The cohesive energy, which is the most important property of bulk and nanomaterials, has been reported experimentally. It has been recognized that the cohesive energy of nanomaterials depends on size and as well as shape. It seems to be very difficult to understand this behavior theoretically. Moreover, in the present paper, we have made an effort to understand this. The model developed is used to compute the cohesive energy of Tungsten nanoparticles of different sizes for different shapes. The results obtained are compared with available experimental data. A good agreement with theory and experiment supports the validity of the model proposed. Due to simplicity and applicability the model may be extended to different types of nanomaterials.

The dwindling fossil fuels have impressed upon the need of finding alternative energy sources. The biofuels derived from renewable resources are an interesting option which is being extensively researched. Biodiesel from non edible plant oils has emerged on the scene which can meet future energy demand. Jatropha curcas, a plant well adapted to semi arid condition is being seen as the source for biodiesel production. Many aspects of this plant have been studied right from its adaptation to genetic improvement. There are many reports where studies have been made on the variability at molecular level. This review deals with the biodiesel production from Jatropha at large and finally on the need of finding other plant sources that can serve the purpose of biodiesel production in the coming times.