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Electrokinetic properties and stability of cerium dioxide suspensions

机译：电动性能和二氧化铈悬浮铈的稳定性

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摘要

The dispersed ceria particles synthesized by destruction (heating) of the double salts of cerium and ammonium nitrate have been determined to be porous. The surface charge density and electrokinetic potential of the particles have been measured by potentiometric titration and micro-electrophoresis. The point of zero charge (pzc) corresponds to pH 5.6 in water and pH 5.2 in 0.001 M KCl solution, whereas the isoelectric point remains around pH 5.8 for both solutions. Constant (negative) values of the zeta-potential in 0.001-0.01 M KCl solutions have been measured; however, at higher salt concentrations, a gradual decrease of the ceria electrokinetic potential has been observed. Addition of CaCl2 and AlCl3 or LaCl3 obtains a considerable decrease in the zeta-potential of the particles and changes the sign correspondingly. After ultrasonic treatment of the suspension, a monomodal particle size distribution with an average particle size of 0.6 mu m was measured. Moreover, the laws of aggregation of CeO2 particles as a function of aging, pH, shear conditions and the concentration of added KCl and CaCl2 solutions have been studied. The obtained results can be explained from the viewpoint that micron-sized strongly hydrated CeO2 particles have a tendency to aggregate over the time under applying shear force or in the presence of electrolytes in a secondary minimum with the formation of loose, easily destroyable and renewable aggregates.
机译：通过铈和硝酸铵的双盐的破坏（加热）合成的分散的二氧化铈颗粒已经确定是多孔的。通过电位滴定和微电泳测量颗粒的表面电荷密度和电动电位。零电荷（PZC）的点对应于水中的pH5.6和0.001M KCl溶液中的pH5.2，而等溶液的等电点保持在pH 5.8周围。已经测量了0.001-0.01M KCl溶液中ζ电位的常数（阴性）值;然而，在较高的盐浓度下，已经观察到逐渐降低了二氧化铈电动电位。加入CaCl 2和AlCl3或LacL3获得粒子的ζ电位的相当大的降低，并相应地改变标志。在超声处理悬浮液后，测量平均粒径为0.6μm的单态粒径分布。此外，已经研究了CeO2颗粒的聚集规律作为老化，pH，剪切条件和添加的KCl和CaCl 2溶液浓度的函数。获得的结果可以从微米尺寸的强水的CeO 2颗粒具有在施加剪切力的时间内聚集的趋势或在二级最小值中的电解质存在下聚集的倾向，并且在形成松散，容易可破坏和可再生的聚集体中。

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  • 来源
    《RSC Advances》 |2016年第73期|共9页
  • 作者

    Barany S.; Bohacs K.; Chepurna I.; Meszaros R.;

  • 作者单位

    Univ Miskolc MTA ME Mat Sci Res Grp Inst Chem H-3515 Miskolc Hungary;

    Univ Miskolc Inst Raw Mat Preparat &

    Environm Proc H-3515 Miskolc Hungary;

    Natl Acad Sci Ukraine Inst Sorpt &

    Problems Endoecol 13 Gen Naumov Str UA-03164 Kiev Ukraine;

    Univ Miskolc MTA ME Mat Sci Res Grp Inst Chem H-3515 Miskolc Hungary;

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  • 正文语种 eng
  • 中图分类 化学;
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