Experimentally derived sticking efficiencies of microparticles using atomic force microscopy
Experimentally derived sticking efficiencies of microparticles using atomic force microscopy
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DOI：
10.1021/es0352000
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发表时间：
2005-02-15
影响因子：
11.4
通讯作者：
Hochella, MF
中科院分区：
文献类型：
--
作者：
Cail, TL;Hochella, MF
胶体颗粒的粘附效率（α）已经从2 μ m羧基化聚苯乙烯微球和二氧化硅玻璃板之间的界面势能使用相互作用力边界层模型导出。界面势能从使用原子力显微镜（AFM）测量的力-距离数据和从基于Derjaguin-Landau-Verwey-Overbeek（DLVO）理论的计算。AFM的力量，在水溶液中的pH值和离子强度条件的范围内进行测量，并DLVO计算进行相同的系统。在大多数情况下，从AFM数据计算出的粘附效率比从DLVO预测计算出的值大得多。粘附效率在0和1之间变化，并且强烈依赖于溶液化学。AFM衍生的粘附效率与测得的微球和收集器ζ电位一致;对于带更多负电荷的表面，粘附效率较低。这些结果提供了直接从物理测量的界面纳米力计算的微粒收集器系统的第一个估计。该研究清楚地表明，DLVO和AFM衍生的粘附效率之间存在显著差异。
The sticking efficiencies (alpha) of colloidal particles have been derived from the intersurface potential energy between 2 mum carboxylated polystyrene microsphe'res and a silica glass plate using the interaction force boundary layer model, The intersurface potential energies were calculated from force-distance data measured using atomic force microscopy (AFM) and from calculations based on Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. AFM forces were measured in aqueous solutions over a range of pH and ionic strength conditions, and DLVO calculations were performed on identical systems. In most conditions, sticking efficiencies that were calculated from AFM data are considerably larger than values calculated from DLVO predictions. Sticking efficienciels vary between 0 and 1 and are strongly dependent upon solution chemistry. AFM-derived sticking efficiencies are consistent with measured microsphere and collector zeta-potentials; sticking efficiencies are lower for more negatively charged surfaces. These results provide the first a estimates of a microparticle-collector system that are calculated directly from physically measured interfacial nanoforces. This study clearly demonstrates that significant differences exist between DLVO- and AFM-derived sticking efficiencies.