The NanoParticle Nebulizer produces droplets with a peak diameter <1 μm in diameter. Using a traditional nebulizer to create an aerosol of colloidal particles often results in interference from any non-volatile residue present in the sample. After droplet evaporation, non-volatile residue creates particles of residue regardless of whether the droplets contain colloidal particles or not. When there is a particle in a droplet,