Die Benetzungseigenschaften einzelner kolloidaler Teilchen

单个胶体颗粒的润湿特性

• 批准号: 5104200
• 负责人: Professor Dr. Hans-Jürgen Butt
• 金额: --
• 依托单位: Max-Planck-Institut für Polymerforschung
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 1998
• 资助国家: 德国
• 起止时间: 1997-12-31 至 2001-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5104200?language=en
• 关键词: Die; Benetzungseigenschaften; einzelner; kolloidaler; Teilchen

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.

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 µm）接触角的技术。开发的设置是密切相关的原子力显微镜的设计。前进接触角（ja）和后退接触角（jt）可以以1-2°的精度测定。两个初步结果是：1.在细颗粒上测得的接触角与在同样制备的平面上测得的接触角有系统的差异，我们计划找出这种差异是否可以用线张力来解释，以及它与表面力的关系.用颗粒测得的滞后ja-jt通常明显小于在平面上测得的滞后。我们打算澄清前进角、后退角和平衡接触角在细颗粒使用中的作用。