Die Benetzungseigenschaften einzelner kolloidaler Teilchen

为了更好地理解微米范围内的润湿现象，我们开发了一种测量单个球形颗粒（2-20 μ m）接触角的技术。发达的装置与原子力显微镜的设计密切相关。前进接触角（ja）和后退接触角（jt）可以以1-2°的精度确定。两个初步结果是：1。在细颗粒上测定的接触角与在类似制备的平面上测定的接触角有系统的不同。我们计划找出这种差异是否可以用线张力来解释，以及它与地面力的关系。用粒子测量的磁滞通常明显小于在平面上测量的磁滞。我们打算澄清的作用，前进，后退和平衡接触角相对于使用细颗粒。

For a better understanding of wetting phenomena in the micrometer regime we developed a technique to measure the contact angle of individual spherical particles ( 2-20 µm). The developed set-up is closely related to the design of atomic force microscopes. Advancing (ja) and receding contact angles (jt) can be determined with an accuracy of 1-2°. Two preliminary results are:1. Contact angles determined on fine particles differ in a systematic way from contact angles measured on similarly prepared planar surfaces.We plan to find out weather this discrepancy can be explained by a line tension and how it is related to surface forces.2. The hysteresis ja-jt measured with particles is usually significantly smaller than the hysteresis determined on planar surfaces.We intend to clarify the role of advancing, receding and equilibrium contact angle with respect to the use to fine particles.