A method for enhanced charging of nanoparticles via condensation magnification

The objective of this work is to propose a novel approach to prepare highly charged nanoaerosol particles. The nanoparticles are first enlarged by condensation of solvent vapor in a mixing-type particle magnifier (PM); the enlarged droplets are then charged by a corona ionizer; the charged droplets are finally dried to return the nuclei to their original size. Experiments were performed with neutralized nanoparticles generated by electrospray of colloidal suspensions, or by the evaporation–condensation method. Average particle charge obtained by this method was found to be approximately proportional to the .