Enhanced coagulation due to evaporation and its effect on nanoparticle evolution

A new explanation for the evolution of particles near a roadway is proposed. The explanation starts with data that suggest that small (less than 15 nm) liquid nanoparticles shed semivolatile organics (less than C(sub 24)) almost immediately upon emission. It is shown here that the shrinking of these particles enhances their rates of coagulation by over an order of magnitude, and this appears important in helping to explain particle evolution further downwind, as measured by two data sets, including one reported here, and as found with a three-dimensional numerical model used to simulate the data. Enhanced coagulation in isolated emission puffs may also affect evolution. Neither condensation, complete evaporation, coagulation alone, nor preferential small-particle dilution appears to explain the evolution. (A)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/0013936X
• Authors:
  • JACOBSON, M Z
  • KITTELSON, D B
  • WATTS, W F
• Publication Date: 2005-12-15

Language

• English

Media Info

• Pagination: 9486-92
• Serial:
  • Environmental Science & Technology
  • Volume: 39
  • Issue Number: 24
  • Publisher: American Chemical Society
  • ISSN: 0013-936X
  • EISSN: 1520-5851
  • Serial URL: http://pubs.acs.org/journal/esthag

Subject/Index Terms

• TRT Terms: Chemistry; Highways; Particles; Pollutants; Simulation
• Uncontrolled Terms: Particle size distribution
• ITRD Terms: 7165: Chemistry; 2442: Emission; 2755: Highway; 4511: Particle; 6200: Particle size distribution; 9103: Simulation
• Subject Areas: Aviation; Environment;

Filing Info

• Accession Number: 01019776
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD
• Created Date: Mar 9 2006 8:13AM