When and how α-terpineol and n-octanol can inhibit bubble attachment to hydrophobic surfaces
 
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Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences
 
 
Publication date: 2011-06-01
 
 
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Kazimierz Malysa   

Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences, ul. Niezapominajek 8, 30-239 Kraków
 
 
Physicochem. Probl. Miner. Process. 2011;47(1):169-182
 
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ABSTRACT
Kinetics of the three phase contact (TPC) formation and phenomena occurring during collision of the rising bubble with Teflon plates of different surface roughness were studied in distilled water, α-terpineol and n-octanol solutions, using a high-speed camera of frequency 1040 Hz. Influence of solution concentration and surface roughness on time of the TPC formation and the time of drainage of the film formed between the colliding bubble and Teflon surface was determined. The surface roughness of the Teflon plates was varied within range 1- 100 μm. It was found that at small α-terpineol and n-octanol concentrations the time of the TPC formation was shortened in respect to distilled water. However, at their high concentrations the time of TPC formation was again longer and magnitude of this effect depended on the surface roughness. For example for Teflon surface of roughness 40-60 μm the time of TPC formation was even 20-30 ms longer. The data obtained indicate that this effect is related to presence of air at the hydrophobic solid surfaces. The mechanism of this prolongation of the time of TPC formation due to the frother overdosage is proposed.
eISSN:2084-4735
ISSN:1643-1049
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