Time scale of the three-phase contact formation by the bubble colling with hydrophobic surface in n-pantenol and n-octanol solutions
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Institute of Catalysis and Surface Chemistry Polish Academy of Sciences
Marta Krasowska   

Institute of Catalysis and Surface Chemistry Polish Academy of Sciences, ul. Niezapominajek 8, 30-239 Cracow, Poland
Publication date: 2005-01-01
Physicochem. Probl. Miner. Process. 2005;39(1):21–32
Phenomena occurring during collisions of the bubble rising in distilled water, n-pentanol and n- octanol solutions with hydrophobic Teflon plates of different roughness were studied using high-speed Camera (1182 Hz). It was found that even in the case of such hydrophobic solid surface as Teflon the bubble attachment didn’t need to occur at first collision. In distilled water the bubble could bounce a few times without attachment. Presence of surface active substance facilitated the attachment as well as lowered the bubble local velocity. Time-scale was shortened in the case “medium rough” Teflon from ca. 40 ms (in distilled water) to 16 ms (in the case of 0.00003 M n- octanol solution), while at the “rough” surface the attachment occurred in 4 ms in both systems. It was observed that surface roughness and presence of gas bubbles at Teflon surface were crucial for the time-scale of the bubble attachment. With increasing surface roughness and immersion time into solution of the Teflon plate the probability that the bubble be attached at once was increased.