Influence of nanoscale roughness on surface wettability
A number of studies have suggested that microscale asperities enhance bubble-particle attachment efficiency. However, in practice the roughening of particulate surfaces can also lead to a decrease in flotation. In the present investigation it is proposed that nanoscale asperities may be partially responsible for this phenomenon. It is suggested that as inter-asperity separation distances are reduced capillary effects are enhanced, leading to the formation of stable liquid domains that adversely impact bubble-particle adhesion. In addition, obstruction of surfactant self-assembly may occur, further limiting flotation.
Key wordsWettability Flotation Bubble-particle attachment
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