Sizing nanoparticles by time-of-flight spectrometry |
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| Affiliation: | 1. Department of Energy, Politecnico di Milano, via Ponzio 34/3, I-20133 Milan, Italy;2. CNR-IMM, Unit of Agrate Brianza, via Olivetti 2, I-20864 Agrate Brianza (MB), Italy;1. Department of Chemistry, Pittsburg State University, Pittsburg, KS 66762, USA;2. Department of Physics, Pittsburg State University, Pittsburg, KS 66762, USA;3. Department of Physical Metallurgy and Materials Testing, Montanuniversitӓt Leoben, 8700 Leoben, Austria;4. Department of Mechanical Engineering Sciences, University of Surrey, GU2 7XH Guildford, UK;5. Department of Mechanical Engineering and Materials Science and Engineering, Cyprus University of Technology, 3036 Lemesos, Cyprus;6. Department of Mechanical and Manufacturing Engineering, University of Cyprus, 1678 Nicosia, Cyprus;7. Department of Chemical Engineering, University of Louisville, Louisville, KY 40292, USA;8. Department of Mechanical Engineering, University of Kansas, Lawrence, KS 66046, USA |
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| Abstract: | Time-of-flight (TOF) spectrometry utilizing scattered light detection of particles passing discrete detection locations in an accelerating gas jet is used for rapid measurement of highly-resolved size distributions of dry powder, gas- or liquid-borne particles having diameter > 300 nm. Extension of the measurement range of this technique to include nanoparticles (< 100 nm diameter) is investigated using a theoretical model to predict the reduction in minimum, scattered-light-detectable, particle size, a limit which restricts present TOF instruments to particles above 300 nm diameter. A single set of preliminary measured data are compared with the theoretical-model predictions. Together, these results indicate that a TOF spectrometer can provide rapid, highly-resolved particle size distribution measurement of nanoparticle powders and suspensions down to ≈ 50 nm diameter. |
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