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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+ 将ZrO2基片分别在10-3mol/L的MgCl2和10-3mol/L NaCl的水溶液中浸泡2h后，用去离子水冲洗10次后，然后将其在硝酸溶液中浸泡2h，并将浸泡液经浓缩后分别用原子吸收光谱进行检测，测定结果是：浸泡液中只检测到痕迹量的镁，而没有检测到钠的存在。这再次表明Mg2+在ZrO2基片上发生了特征吸附，而Na1+却没有发生特征吸附。 |
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bingd600420(金币+30, 翻译EPI+1): 谢谢 2011-01-18 13:27:45
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Test results indicated that Mg2+ had the typical adsorption on the coating surface of nano- ZrO2 but Na+ wasn’t.The coating surface of nano- ZrO2 wasn’t easy to result in it’s lattice’s electric charge unbalanced and generated adsorption of other ions.Due to hydrate Cl- wasn’t easy complexing with Zr4+ on the surface of cardinal nano- ZrO2 in NaCl diluted aqueous solution,therefore, we could remove the possibility for the typical adsorption of Cl – and the non-DLVO acting force was only produced by the typical adsorption of Mg2+ . Primarily due to the hydrolysis on the surface of nano- ZrO2 or the lone paired electron of O in OH- accept proton so as to make the surface become electropositive or electronegative. ZrsurfaceOH→ZrOsurface-+H+ or ZrsurfaceOH+H+→ZrsurfaceOH2+ Putting ZrO2 substrate on 10-3mol/L aqueous solution for MgCl2 and NaCl stay for 2h,respectively,then washing with deionized water for 10 times and dunking in nitric acid for 2h,after that using AAS to characterize,the results indicated that we could only detect the trace quantity of Mg but not for Na in soak solution.This thirdly indicated that Mg2+ had the typical adsorption on the coating surface of nano- ZrO2 but Na+ wasn’t. |
2楼2011-01-17 23:11:15
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