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wuming1987

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图3为半对数坐标下的作用力随作用距离的变化关系。用AFM通过力-距离曲线研究表面相互作用时,当相互作用曲线为一直线关系时,表明其为长程相互作用力。当相互作用曲线在某一距离处产生突变时,表明在该距离点存在短程排斥力,如图3所示,当pH为8.02、MgCl2浓度为10-3mol/L时,相互作用曲线在作用距离为4.5nm时表现为二条断开的直线。在距离小于4.5nm时,直线C变得更陡,说明存在短程排斥力。当pH为8.02、NaCl浓度为10-3mol/L时,相互作用曲线表现为一直线关系,则没有表现出短程斥力存在,从而表现出惰性电解质的特征。以上测试结果表明Mg2+在ZrO2纳米涂层表面具有特征吸附,而Na+却没有发生特征吸附。ZrO2纳米涂层的表面在水溶液中不易造成晶格本身电荷失衡并引起其他离子的吸附。在MgCl2、NaCl的稀水溶液中,由于水化的氯离子不易与四方相ZrO2纳米晶表面的Zr4+离子络合,因此可以排除Cl -的特征吸附的可能,因此所产生的短程非DLVO作用力只可能来源于Mg2+的特征吸附。
    在水溶液中主要由于ZrO2纳米晶表面的羟基的水解或者羟基中的氧原子的孤对电子接受质子,从而使表面荷正电或负电:
ZrsurfaceOH→ZrOsurface-+H+       或ZrsurfaceOH+H+→ZrsurfaceOH2+
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wuming1987(金币+5, 翻译EPI+1): 2011-01-21 10:38:27
ringzhu(金币+15): 辛苦~~欢迎常来~~ 2011-04-12 13:37:35
Figure 3 for half a logarithmic coordinates under the force with the changing relations between the effective distance. With AFM research by force-distance curve surface interaction, when interaction for a linear relation curves, it shows its for long-term mutual reaction. When interaction in a certain distance curves in produce mutations that shows in the distance point existence short-range repelling force, fig.03 shows, when pH, MgCl2 concentration for 8.02 for 10-3mol/L, interaction curve in action distance 450 nm performance for two broken line. In the distance, less than 4.5 nm linear C become more steep, explain exist short-range repelling force. When the pH for 8.02, NaCl concentration for 10-3mol/L, interaction curve shown as a linear relation, is not showing a short-range repulsion exist, thus showing inert electrolyte characteristics. Above tests results show that in Mg2 + ZrO2
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