Ice particles trapped by temperature gradients at mbar pressure

Kelling, Thorben; Wurm, Gerhard; Dürmann, Christoph
November 2011
Review of Scientific Instruments;Nov2011, Vol. 82 Issue 11, p115105
Academic Journal
In laboratory experiments we observe that ice particles (<=100 μm) entrained in a low pressure atmosphere (∼1 mbar) get trapped by temperature gradients between three reservoirs at different temperature. Confining elements are a peltier element at 250 K (bottom), a liquid nitrogen reservoir at 77 K (top), and the surrounding vacuum chamber at 293 K. Particle levitation and trapping is modeled by an interplay of thermophoresis, photophoresis, and gravity. A number of ice particles are trapped simultaneously in close spatial distance to each other at least up to minutes and are accessible for further experiments.


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