Kinetics of CO2 nanobubble formation at the solid/water interface.
Kinetics of CO2 nanobubble formation at the solid/water interface.
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DOI：
10.1039/b709624k
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发表时间：
2007-12
期刊：
影响因子：
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通讯作者：
Jingwu Yang;J. Duan;D. Fornasiero;J. Ralston
中科院分区：
文献类型：
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作者：
Jingwu Yang;J. Duan;D. Fornasiero;J. Ralston
用石英晶体微天平（QCM）研究了水溶液中CO（2）分子在疏水化二氧化硅表面上的吸附动力学。本研究的结果与早期在相同实验条件下从轻敲模式原子力显微镜（TMAFM）获得的结果进行了比较（J. Yang，J. Duan，D. Fornasiero，J. Ralston，J. Phys. Chem. B.，2003，107（25），6139-6147;参考文献1）。QCM的结果代表了CO（2）气体吸附的早期阶段（<20 min），在CO（2）气泡吸附在表面上之前，可以通过TMAFM直接观察到。QCM结果证实了我们从TMAFM成像中观察到的结果：溶液中存在的CO（2）气体分子仅在二氧化硅表面疏水时吸附在二氧化硅上。更重要的是，结果表明，气体吸附/气泡生长经历了两个连续的动力学过程：一个缓慢和快速吸附过程。
The kinetics of adsorption of CO(2) molecules dissolved in aqueous solution onto a hydrophobised silica surface were investigated using a quartz crystal microbalance (QCM). The results of this investigation were compared with those obtained earlier from tapping mode atomic force microscopy (TMAFM) under the same experimental conditions (J. Yang, J. Duan, D. Fornasiero, J. Ralston, J. Phys. Chem. B., 2003, 107(25), 6139-6147; ref. 1). The QCM results represent the early stage of CO(2) gas adsorption (<20 min), before CO(2) gas bubbles adsorbed on the surface can be directly observed by TMAFM. The QCM results confirmed our observation from TMAFM imaging: that CO(2) gas molecules present in solution only adsorb on silica when its surface is hydrophobic. More importantly, the results showed that gas adsorption/bubble growth undergoes two consecutive kinetic processes: a slow and a fast adsorption process.