Abstract
A DROP of benzene introduced into a vessel of water through a capillary tube spreads to a limited extent over the surface of galena that has been coated by any of the compounds known in flotation as collectors1. If now the tube be raised slowly, the benzene drop becomes elongated and then ruptures. The angle of contact being greater than 90°, a portion of the benzene remains on the mineral surface, the greater part contracts into a nearly spherical pendent drop at the end of the capillary tube, and the small portion that formed the waist before breaking becomes a minute drop that rises slowly through the water. It does not immediately coalesce with the pendent drop when they meet. After a variable induction period, a very rapid change occurs, as the result of which the small drop may disappear altogether or may merely decrease in size. On occasions there may be four such diminutions in size before the drop disappears, the induction period for each being several seconds. Other organic liquids behave similarly.
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References
Wark and Cox, ” Milling Methods”, Trans. Amer. Inst. Min. and Met. Eng., 112, 189; 1934.
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WARK, I., Cox, A. Coalescence in Stages between Two Drops of a Liquid. Nature 136, 182 (1935). https://doi.org/10.1038/136182a0
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DOI: https://doi.org/10.1038/136182a0
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