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Effect of Surface Hydrophobicity on the Formation and Stability of Oxygen Nanobubbles
Author(s) -
Pan Gang,
Yang Bo
Publication year - 2012
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201100714
Subject(s) - nanoscopic scale , suspension (topology) , oxygen , chemical engineering , contact angle , particle (ecology) , chemistry , nanoparticle , wetting , particle size , nanotechnology , materials science , organic chemistry , homotopy , pure mathematics , engineering , oceanography , mathematics , geology
The formation mechanism of a nanoscale gas state is studied on inorganic clay surfaces modified with hexamethyldisilazane, which show different contact angles in ethanol–water solutions. As the dissolved oxygen becomes oversaturated due to the decrease in ethanol–water ratio, oxygen nanoscale gas state are formed and stabilized on the hydrophobic surfaces so that the total oxygen content in the suspension is increased compared to the control solution without the particles. However, the total oxygen content in the suspension with hydrophilic surfaces is lower than the control solution without the particles because the hydrophilic particle surfaces destabilize the nanobubbles on the surfaces by spreading and coagulating them into microbubbles that quickly escape from the suspension solution. No significant correlation was observed between the nanobubble formation and the shape or roughness of the surfaces. Our results suggest that a nanoscale gas state can be formed on both hydrophobic and hydrophilic particle surfaces, but that the stability of the surface nanoscale gas state can vary greatly depending on the hydrophobicity of the solid surfaces.