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Long-range electrostatic attraction between like-charge spheres in a charged pore

机译：带电孔中类似电荷球之间的远距离静电吸引

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摘要

The existence of long-range attractive electrostatic forces between particles of like charge is one of the great current controversies of colloid science. The established theory (Derjaguin-Landau-Vervey-Overbeek; DLVO) of colloidal interactions predicts that an isolated pair of like-charged colloidal spheres in an electrolyte should experience a purely repulsive screened electrostatic (coulombic) interaction. Direct measurements of such interactions have shown quantitative agreement with DLVO theory. Recent experiments, however, provide evidence that the effective interpartide potential can have a long-range attractive component in more concentrated suspensions and for particles confined by charged glass walls. It is apparent that the long-range attraction in concentrated systems is due to multi-body interactions and may have a similar explanation to the attraction observed for otherwise confined colloids. Theoretical explanations have been proposed but remain the subject of controversy. Here we present a quantitative theoretical explanation of these attractive forces between confined colloidal particles, based on direct solutions of the nonlinear Poisson-Boltzmann equation for two like-charged spheres confined in a cylindrical charged pore. The calculations show that the attraction may be explained by the redistribution of the electric double layers of ions and counterions in solution around the spheres, owing to the presence of the wall; there is thus no need to revise the established concepts underlying theories of colloidal interactions.
机译：相似电荷的粒子之间存在远距离吸引力静电力是胶体科学当前的重大争议之一。胶体相互作用的既定理论（Derjaguin-Landau-Vervey-Overbeek; DLVO）预测，电解质中一对孤立的带类似电荷的胶体球应经历纯排斥性筛选的静电（库仑）相互作用。对此类相互作用的直接测量已显示出与DLVO理论的定量一致性。但是，最近的实验提供了证据，即有效的中间离子势能在更浓缩的悬浮液中以及由带电玻璃壁限制的颗粒中具有长距离吸引成分。显然，在浓缩系统中的远距离吸引力是由于多体相互作用引起的，并且可能与观察到的对于其他受限胶体的吸引力具有相似的解释。已经提出了理论解释，但仍然是有争议的主题。在这里，我们基于约束在圆柱带电孔中的两个带相似电荷的球体的非线性Poisson-Boltzmann方程的直接解，给出了对受限胶体颗粒之间这些吸引力的定量理论解释。计算表明，由于存在壁，可以用溶液中离子和抗衡离子的双电层在球体周围的重新分布来解释吸引力。因此，无需修改胶体相互作用理论基础的既定概念。

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  • 来源
    《Nature》 |1998年第6686期|p.663-665|共3页
  • 作者

    W. Richard Bowen; Adel O. Sharif;

  • 作者单位
  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
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