Influence of Nanobubbles on the Adsorption of Nanoparticles

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• 作者：Hyejung Seo ; Myungsun Yoo ; Sangmin Jeon
• 刊名：Langmuir
• 出版年：2007
• 出版时间：February 13, 2007
• 年：2007
• 卷：23
• 期：4
• 页码：1623 - 1625
• 全文大小：45K
• 年卷期：v.23,no.4(February 13, 2007)
• ISSN：1520-5827

文摘

A quartz crystal microbalance was used to study the influence of nanobubbles on the adsorption of polystyrenenanoparticles onto surfaces coated with gold, or coated with dodecanethiol or mercaptoundecanoic acid self-assembledmonolayers (SAMs). Adsorption of the nanoparticles onto the surface causes the resonant frequency of the quartzcrystal to decrease. We found that particles were adsorbed onto the gold-coated quartz crystal in air-rich water, butnot in degassed water. This finding supports the long-standing hypothesis that nanobubbles play a key role in thelong-range attractive force between hydrophobic surfaces in aqueous solutions. When the experiments were conductedusing quartz crystals coated with a hydrophobic dodecanethiol SAM, the nanoparticles were adsorbed onto the surfaceeven in degassed water due to the short-range hydrophobic interactions between the nanoparticles and the dodecanethiolmolecules. In contrast, the nanoparticles were adsorbed to a lesser degree onto the hydrophilic mercaptoundecanoicacid-coated crystals due to electrostatic repulsive forces.