NOVELTY - The apparatus comprises a first burner or atomizer (104) for forming a first aerosol, a second burner or atomizer (108) for forming a second aerosol, a chamber (112) present in fluid communication with the first and second burners or atomizers for receiving and mixing the first and second aerosols, and an exit port (126) connected to the chamber for allowing the aerosols to escape the chamber. The first aerosol is compositionally distinct from the second aerosol, and has an average size that is significantly different from the second aerosol. The first/second burner or atomizer has a nozzle.    USE - The apparatus is useful for combining distinct first and second aerosols for forming a composite material or film, where: the first aerosol is an aerosol of lithium active compound particles including lithium iron phosphate or precursor; the second aerosol is an aerosol of carbon particles (all claimed); and the composite material is a multicomponent nanoparticle material, which is useful in dye sensitized solar cells, lithium or lithium ion batteries and solid acid fuel cells.    ADVANTAGE - The apparatus is capable of rapidly combining the first and second aerosols without recondensation of liquid from the aerosols thus efficiently preparing the composite materials with good electrical conductivity and increased grain size.    DETAILED DESCRIPTION - The apparatus comprises a first burner or atomizer (104) for forming a first aerosol, a second burner or atomizer (108) for forming a second aerosol, a chamber (112) present in fluid communication with the first and second burners or atomizers for receiving and mixing the first and second aerosols, and an exit port (126) connected to the chamber for allowing the aerosols to escape the chamber. The first aerosol is compositionally distinct from the second aerosol, and has an average size that is significantly different from the second aerosol. The first/second burner or atomizer has a nozzle or aperture in the form of a slot. The first and second burners or atomizers, the chamber and exit port are configured in the form of a slot. An INDEPENDENT CLAIM is included for a process of forming lithium active compound particles.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of an apparatus for generating multicomponent nanoparticle films including multiple atomizers.    First atomizer (104)    Second atomizer (108)    Chamber (112)    Heating element (114)    Conduit (116)    Exit port. (126)