Introduction: scales. Novel techniques of energy conversion and With the micronization, the fundamental production are being proposed and implemented to physiochemical properties of particles change and secure each joule of energy from the energy they become very reactive [1]. The specific surface production processes. Concentrated energy area of powders increases with the decrease their diameters. Higher specific surface area creates materials are being used to enhance power to more contact points among the reactants and weight ratio of the machines. It is more logical to increases the homogeneity of the mixture that, in understand the energy conversion and its turn, increases the speed of chemical reactions. The transportation at the level where these processes specific surface area and the ratio of surface atoms are being achieved i.e. at atomic level. to bulk atoms increase dramatically with the Phenomenological understanding of energy decrease of diameters of the particles, Fig. 1 [2]. The conversion methods at bulk scales are being co-ordination number decreases with the decrease replaced with micro-scale and now even with nano- of diameter. When co-ordination number becomes Oxidation Behaviour of Nanoaluminum Particles in the Atmosphere of Air and Nitrogen 1* 1 2 1 3 1 F. Noor , S. Imran , Z. Ali , A. Hussain , H. M. Ali , S. Mehmood Abstract Oxidation and nitridation of nano aluminum particles (NAPs) were studied experimentally by using simultaneous thermal analysis (STA) which is combination of differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) in the atmosphere of air and nitrogen at one atmospheric pressure conditions. It was observed that in air the oxidation process of NAPs completed in three steps whereas in the nitrogen it was a two stepped reaction. In air the major oxidation step was observed before melting of the particles while in nitrogen it occurred after that. The particles were ignited in air whereas no such rapid reaction was seen in nitrogen. It was also observed that the heat produced during the chemical reaction in air was three times the heat produced in nitrogen atmosphere. Detailed characterisation of nano aluminum particles (NAPs) before and after the experiments was done with scanning electron microscopy (SEM), transmission electron microscopy (TEM), Nanosizer (DLS), energy dispersive X-ray spectroscopy (EDS) and powder X-ray diffraction (XRD). Keywords: Oxidation, nitridation, differential scanning calorimetry, thermogravimetric analysis, aluminum nano particles Submitted: 05/03/2015, Accepted: 01/04/2015, Online: 08/04/2015 1 Department of Mechanical Engineering, University of Engineering and Technology Lahore, Pakistan 2 Department of Mining Engineering, University of Engineering and Technology Lahore, Pakistan 3 Department of Mechanical Engineering, University of Engineering and Technology Texila, Pakistan Corresponding Author: Fahad Noor (f.noor@uet.edu.pk) JPIChE 43 (1) 2015: 47-56 journal homepage: www.piche.org.pk/journal Journal of Pakistan Institute of Chemical Engineers 47 Journal of The Pakistan Institute of Chemical Engineers