Technique for Aerosol Generation with Controllable Size Distribution (Nanometer and Micrometer)

The purpose of this study is to develop an aerosol generating system that can produce particles of micrometer and nanometer size in a convenient and efficient way. This system is comprised of an atomizer (ultrasonic for micrometer-size and electrospray for nanoparticle) and a program-controlled solute feeding unit with different solute concentrations. Both the aerosol concentration and size distribution pattern can be easily controlled and reproduced in the developed system. While the initial size of droplets generated from atomizer may remain unchanged, the size of residual dry aerosols was controlled by the solute concentration adjusted by the mixing ratio of solute and water. In addition, solute concentration could be alternatively adjusted in any cyclic way to provide particles with relatively monodisperse, bimodal, varying size as well as skew distribution to meet requirements in various applications.nother feasible generating system was developed to generate particles of 5 to 100 nanometers in diameter to simulate the samples from various environment sources by a evaporation/condensation type aerosol generator of electrically heated ceramic tube generating system. The generated nanoparticles of different sintering condition could be used in the toxicity study of different particle size and surface area.