Abstract
The velocity of diffusiophoresis accompanying the Stefan flow was experimentally studied for a Knudsen number of 0.13. Water, ethanol, toluene and ethyl acetate were used as the diffusing vapor. The vapor pressure gradient and temperature gradient were formed in a space between horizontal parallel plates at different temperatures (the upper plate has the higher temperature) and being wetted by a liquid. A singly charged standard polystyrene latex (PSL) particle (1.00 μm) was suspended in that space under atmospheric pressure and was balanced by applying a d.c. voltage to the parallel plates. This method actually measures the resultant force of thermophoresis and diffusiophoresis, and the thermophoretic force separately measured in vapor free conditions was subtracted to obtain the diffusiophoretic force. The results thus obtained were found to be in good agreement with Waldmann's theory.
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