Séminaire Daren CHEN - link to his brief bio
Virginia Commonwealth University, Richmond, Virginia, USA
13 juillet 2018, 10:00, Amphithéatre du CERLA, Université de Lille, Faculté des Sciences et Technologies
Miniaturization of Electrical Mobility Particle Sizer for Fine and Ultrafine Particle Monitoring
Wireless sensor network based on particle sensors are in high demand for emerging applications such as continuous monitoring of spatial/surface distribution of fine and ultrafine particles (UFPs) in local communities, air quality and traffic monitoring in smart cities, early fire detection in buildings and hospitals, worker protection in the nanomaterial facility, vertical UFP profiling, and many others. Cost-effective and light-weighted particle sensors in a compact package are required to realize the above applications under the consideration of limited budget. In this talk we will discuss our development effort in the miniaturization of electrical mobility particle sizers, including the development of a mini-plate aerosol charger for electrically charging sampled particles, a mini-plate DMA for particle sizing based on particle electrical mobility and a mini Faraday cage with sensitive pre-amp for measuring electrical charges carried by charged particles. With all the accessary, the overall package size and weight of the prototype sizers are 5" (L) × 5" (W) × 6" (H) and 3 lb, respectively. In addition to the measurement of particle size distribution, the prototype further equips with the capability of recording temperature, relatively humidity, pressure, timing, GPS and altitude of the samples. The prototype mini-eUPS can be used either as a single-alone sensor or a node in wireless sensor network.
Daren (Da-Ren) Chen, Ph.D., is now Floyd D. Gottwald Sr. Endowed Chair Professor in Mechanical and Nuclear Engineering, Virginia Commonwealth University. He received his PhD. from Particle Technology Laboratory, University of Minnesota (1996). He is the principal investigator and inventor of electrospray monodisperse particle generator, nanometer differential mobility analyzer, high-through nanoparticle charger, fast scan electrical aerosol sizer, personal particle monitors, continuous gene transfector and many other particle processing tools. He has published more than 136 peer-viewed journal papers. He holds 34 US and 4 international patents in the area of aerosol particle technology. He receives Sheldon K. Friedlander Award (1997), Smoluchowski Award (2002), Kenneth Whitby award (2005) and Benjamin Liu Award (2012) for his significant contribution in nanoparticle instrumentation and experimental techniques. He has intensive experience on particle sampling and characterization, particle instrumentation, atmospheric aerosol, micro-contamination control in semiconductor processing, filtration and separation, health effect of particles, nanotoxicity, and particle synthesis/generation for energy, pharmaceutical and biomedical applications.