摘要
固/液界面纳米气泡的存在已经得到证实,并成为界面科学研究的一个焦点。在原子力显微镜液体池内制备纳米气泡的基础上,本研究建立了在开放体系中进行醇水替换,制备纳米气泡的方法。原子力显微镜观察显示,开放体系中进行醇水替换,也可以在水/云母界面上稳定地生成纳米气泡。将不同环境下制备的纳米气泡进行比较,统计结果显示,在开放体系下制备的纳米气泡密度较低,形态也较小。不同环境下醇水替换产生的纳米气泡数量和形态的差异,为纳米气泡形成的机制提供了新的佐证。开放体系下纳米气泡制备方法的建立拓展了纳米气泡的制备条件,揭示了纳米气泡存在的普遍性,同时也为纳米气泡性质研究提供了新的途径。
Nanobubbles had been proven existent at the liquid/solid interface and became a researching hotpoint in varied interfacial processes. Based on formation of nanobubbles in liquid cell in Atomic Force Microscope （AFM）, the method for repeatable and controllable formation of nanobubble at water/mica interface by water/ethanol exchange in ambient was set up. It was noticed in the AFM images that the nanobubbles formed in ambient were lower in density and smaller in size than those formed in liquid cell. The density of nanobubbles formed in ambient was only 6.93 ± 1.38 （Ave ± S. E. ） per ten square micron, much lower than that in liquid cell, namely 29.06 ± 5.04 （Ave ± S. E. ）. The distributions of height and diameter of nanobubbles were compared. The result revealed that the nanobnbbles formed in ambient concentrated in the area of short diameter, half of them were less then 50 nm and few nanobubble was found larger then 90nm in diameter. On the other hand, some 20% nanobubbles formed in liquid cell were larger than 90 nm in diameter. As the height was referred, more than 55% nanobubbles formed in ambient distributed in the area of lower then 6nm, and less distributed in the area of higher then 8nm comparing to those formed in liquid cell. This resuh that the mode of water/ethanol exchange could affect the formation of nanobubbles gave a hint on the mechanism of nanobubble formation. The formation of nanobubble in ambient strongly supports the ubiquitous presence of nanobubble and facilitated the studies on property of nanobubble as well.
出处
《电子显微学报》
CAS
CSCD
北大核心
2009年第3期240-245,共6页
Journal of Chinese Electron Microscopy Society
基金
国家自然科学基金资助项目(No.20403010)~~
关键词
纳米气泡
原子力显微镜
开放体系
云母
醇水替换
nanobubble
atomic force microscope （AFM）
in ambient
mica
water/ethanol exchange
作者简介
吴志华（1976-），男（汉族），江西人，博士，副教授．E-mail：zhihuawu@gmail．com．
