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以上測試結果表明Mg2+在ZrO2納米涂層表面具有特征吸附,而Na+卻沒有發(fā)生特征吸附。ZrO2納米涂層的表面在水溶液中不易造成晶格本身電荷失衡并引起其他離子的吸附。在MgCl2、NaCl的稀水溶液中,由于水化的氯離子不易與四方相ZrO2納米晶表面的Zr4+離子絡合,因此可以排除Cl -的特征吸附的可能,因此所產生的短程非DLVO作用力只可能來源于Mg2+的特征吸附。 在水溶液中主要由于ZrO2納米晶表面的羥基的水解或者羥基中的氧原子的孤對電子接受質子,從而使表面荷正電或負電: ZrsurfaceOH→ZrOsurface-+H+ 或ZrsurfaceOH+H+→ZrsurfaceOH2+ 將ZrO2基片分別在10-3mol/L的MgCl2和10-3mol/L NaCl的水溶液中浸泡2h后,用去離子水沖洗10次后,然后將其在硝酸溶液中浸泡2h,并將浸泡液經濃縮后分別用原子吸收光譜進行檢測,測定結果是:浸泡液中只檢測到痕跡量的鎂,而沒有檢測到鈉的存在。這再次表明Mg2+在ZrO2基片上發(fā)生了特征吸附,而Na1+卻沒有發(fā)生特征吸附。 |
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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. |
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