1. A system for optimizing and controlling particle size distribution and for scale-up of nanoparticle production in an aerosol flame reactor comprising of: an aerosol flame reactor integrated with process instruments, wherein the said reactor further comprises of at least one burner; at least one precursor or reactant fed to the said aerosol flame reactor; at least one stream input fed along with at least one precursor or reactant to the said aerosol flame reactor; a simulation tool with programmed instructions to cause the processor to couple flame dynamics model and particle population balance model in order to optimize and control mean particle size and specific surface area and for scale-up of nanoparticle production in an aerosol flame reactor.