Negative photophoresis of smoke particles observed under microgravity
| Autor: | Nobuyuki Magome, Kenichi Yoshikawa, Shun Watanabe, Masahiro I. Kohira, Takafumi Iwaki |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Smoke
Convection Buoyancy business.industry Chemistry Flow (psychology) General Physics and Astronomy Mechanics engineering.material Photophoresis Physics::Fluid Dynamics Optics engineering Particle Astrophysics::Earth and Planetary Astrophysics Laser power scaling Physical and Theoretical Chemistry business Physics::Atmospheric and Oceanic Physics Laser beams |
| Zdroj: | Chemical Physics Letters. 511:447-451 |
| ISSN: | 0009-2614 |
| DOI: | 10.1016/j.cplett.2011.06.048 |
| Popis: | We observed the photophoresis of smoke particles in a small focal laser beam under micro-gravity, exerted in an airplane, to avoid air convectional flow due to buoyancy. We measured the motion of smoke particles and found that the particles exhibit negative photophoresis under the suppression of the convection. Based on the distribution of velocity of negative photophoresis, it is shown that the photophoretic velocity is proportional to the laser power applied for the particle. We discuss the mechanism in terms of the radiometric force. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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