Publications


Title : Negative photophoresis of smoke particles observed under microgravity

Language: English
Type: Article
Authors: Shun N. Watanabe, Takafumi Iwaki, Masahiro I. Kohira, Nobuyuki Magome and Kenichi Yoshikawa
Journal: Chemical Physics Letters
Volume: 511
Number: 4-6
Month: 8
Year: 2011
Actual year: 2011
Pages: 447-451
doi:   10.1016/j.cplett.2011.06.048
Abstract: 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.

"Negative photophoresis of smoke particles observed under microgravity"

Shun N. Watanabe, Takafumi Iwaki, Masahiro I. Kohira, Nobuyuki Magome and Kenichi Yoshikawa, Chemical Physics Letters, 511, 447-451 (2011)