Da-Ren Chen email: chen@me.wustl.edu Cupples II, Room 214 Phone: +1 (314) 935-5464 FAX: +1 (314) 935-5464 Environmental Engineering Science Program Washington University Campus Box 1180 St. Louis, MO 63130-4899

  Da-Ren Chen
  Associate Professor, Mechanical and Aerospace Engineering

• Ph.D., Mechanical Engineering, University of Minnesota, 1997
• M.S., Mechanical Engineering, University of Minnesota, 1993
• M.S., Power Mechanical Engineering, National Tsing Hua University, Taiwan, 1987
• B.S., Power Mechanical Engineering, National Tsing Hua University, Taiwan, 1985

 Background :

• Assistant Professor, Washington University in St. Louis (2001-2005)
• Assistant Professor, University of Minnesota (1998-2001)
• Research Associate, University of Minnesota (1997-1998)
• Research Assistant, University of Minnesota (1991-1997)

 Research Interests:

• Particle Instrumentation
  Particle generation, processing, detection/monitoring, and measurements are required in particle related applications. The primary goal of this project is to develop particle instruments to meet application needs, especially for nanoparticles.
  
  
• Combustion Aerosol
  Particulates are often emitted from combustion sources. Evidences have shown their strong impacts on the environment and human health. Combustion processes are also used to produce nanoparticles for environmental and industrial applications. This project seeks to understand the formation of particles in the processes, and the development of the strategy/technology for emission control or for engineering desirable particles.
  
  
• Particle Separation and Filtration
  Many applications require the techniques of particle separation and filtration. Examples are material recovery, indoor air quality control, worker protection, particulate emission control, engine oil filtration, food processing. The goals of this project are to characterize the performances of filtration devices/systems both experimentally and theoretically, and to provide the guidance for designing/improving the systems/technologies.
  
  
• Particle Contamination Control and Cleaning
  Techniques for particle contamination control and cleaning from surfaces are required for many environmental and industrial applications, for instance, cleaning of contaminated surfaces, particle control in semiconductor processing. The primary interests of the project are to advance the techniques for detecting particles on surfaces, to develop the control technology for particle contaminants, and to search for effective particle cleaning methods.
  
  
• Particle Applications in Molecular Biology, Medicine and Pharmaceutics
  Many applications in molecular biology, medicines and pharmaceutics involve particles. Examples are particle toxicity, gene transfection, encapsulation of pharmaceutical powders, target delivery, inhaler design and evaluation, nano-medicine reformation, and particle deposition in lungs. How to improve existed technologies and developing new techniques for these applications are the research interest in this area.
  
  
• Fundamental Particle Studies
  Fundamental particle studies are of interest for the particle instrumentation development and applications related to particles. To study the particle behaviors in different environments, and the interaction among particles or with environments is the primary objective of this research area. The development of modeling and simulation techniques for particle dynamics in non-reactive and chemically reactive environments, and the model verification by experiments are the primary activities in this area.

 Graduate Research Associates:

• Weiling Li
• Chaolong Qi
• Da-Chih Hsiao

  Recent Publications:

• Yoshiyuki Endo, DA-REN CHEN and D. Y.H. Pui, "Air and Water Permeation Resistance across Dust Cake on Filters: Effects of Particle Polydispersity and Shape Factor", Special Issue in Memory of Dr. Iinoya, Powder Technology, 118(1-2), 24-31, 2001.
  
• K. S. Woo, DA-REN CHEN, D. Y. H. Pui and W. E. Wilson, "Use of Continuous Measurements of Integral Aerosol Parameters to Estimate Particle Surface Area," Special Issue on Particulate Matter and Health: The Scientific Basis for Regulatory Decision, Aerosol Science and Technology, 34(1), p57-65, 2001.
  
• K. S. Woo, DA-REN CHEN, D. Y. H. Pui and P. H. McMurry, "Measurements of Atlanta Aerosol Size Distribution: Observation of Ultrafine Particle Events," Special Issue on Particulate Matter and Health: The Scientific Basis for Regulatory Decision, Aerosol Science and Technology, 34(1), p75-87, 2001.
  
• P. H. McMurry, K. S. Woo, R. Weber, DA-REN CHEN, and D. Y. H. Pui, "Size Distributions of 3-10 nm Atmospheric Particles: Implications for Mucleation Mechanism," Phil. Trans. R. Soc. Lond., A, 358, p2625-2642, 2000.
  
• DA-REN CHEN, C. H. Wendt and D. Y. H. Pui, "A Novel Approach for Introducing Bio-material into Cells," J. of Nanoparticle Research, 2, p133-139, 2000.
  
• D. Y. H. Pui and DA-REN CHEN, "Direct Reading Instruments for the Determination of Aerosols and Particulates," in Encyclopedia of Analytical Chemistry, R. A. Meyers (Ed.), pp 4649-4669, 2000.
  
• D. Y. H. Pui, J. R. Brock, DA-REN CHEN, H. Fissan, C. D. Frisbie, C. E. Lyman, J. C. Miller, G. W. Mulholland, R. Pecora, O. Preining, T. Vo-Dinh, "Instrumentation and Measurement Issues for Nanometer Particles: Workshop Summary,"J. of Nanoparticle Research, 2, p103-112, 2000.
  
• Hee-Siew Han, DA-REN CHEN, and D. Y. H. Pui, "A Nanometer Aerosol Size Analyzer for Rapid Size Distribution Measurements," J. of Nanoparticle Research, 2, p43-52, 2000.
  
• P. H. McMurry, K. S. Woo, R. Weber, DA-REN CHEN, and D. Y. H. Pui, "Size Distributions of 3 to 10 nm Atmospheric Particles: Implications for Nucleation Mechanisms," Philosophical Transaction of the Royal Society (Series A: Mathematical, Physical and Engineering Science), Proceedings of the Discussion Meeting on Ultra fine Particles in the Atmosphere, March 15-16, 2000.
  
• M. Marjamaki, J. Keskinen, DA-REN CHEN, D. Y. H. Pui, "Performance Evaluation of the Electrical Low-Pressure Impactor (ELPI)," J. of Aerosol Science, 31(2), p249-261, 2000.

 Additional Contact Information:

Nanoparticle Research and Technology Lab (Urbauer 109): 935-4983