In a first aspect, the process includes utilizing a precursor medium comprising particles and a nongaseous precursor to form product nanoparticles having a core/shell structure. In another aspect, the process includes utilizing an emulsion precursor medium comprising a nongaseous precursor and two liquid vehicles, wherein one of the liquid vehicles provides desirable thermal effects upon combustion. In another aspect the flame spray process includes modifying solid particles in a flame spray process to change the phase thereof.
