Scatter-Free Infrared Spectra of Single, Isolated 5 μm Particles of Respirable Dust
Creators:McCormack, Matthew C.
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Publisher:The Ohio State University
Series/Report no.:The Ohio State University. Department of Chemistry Honors Theses; 2010
The phenomenon of extraordinary transmission on subwavelength metal mesh arrays, as assisted by propagating surface plasmons (PSPs), will be used to obtain essentially scatter-free infrared spectra of individual dust particles that fill the holes of the mesh. This technique allows for the characterization and quantification of the materials in the dust with an emphasis on single, isolated particles in the respirable size range, specifically 1-5 μm. With the combined use of a variety of instruments including the Scanning Electron Microscope (SEM), Optical Microscope, and IR imaging microscope, the physical characterization of the dust particles will be analyzed. Calibration spectra of known materials were also obtained, including calcite, dolomite, gypsum, quartz, and kaolinite. Once the IR spectrum of the individual particles is obtained, Mie Scattering Theory and Bruggeman Effective Medium Theory are used to model the individual particle spectra and begin to characterize and quantify the chemical components of the individual particles.
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