论文标题
浸入涂层期间粒子的毛细管过滤
Capillary filtering of particles during dip coating
论文作者
论文摘要
从液体浴中提取的物体涂有一层薄层的液体。与液体一起，可以将诸如浴中存在的颗粒之类的杂质转移到撤离的基板上。夹带的颗粒在局部修改膜的厚度，从而改变涂层的质量和特性。在这项研究中，我们表明，在稀释后悬浮液中，可以单独夹带液体并避免底物污染底物。我们使用由液态浴的板组成的模型系统，我们观察到颗粒可以被困在弯月面中，该弯月面在夹带中施加了电阻性毛细管。我们表征了不同的夹带速度随着戒断速度的增加而表征：从纯液体膜到包含颗粒簇的液体膜，最终是单个颗粒。该毛细管过滤是对从污染浴中撤离的底物污染的有效障碍，并发现针对生物污染的应用。
An object withdrawn from a liquid bath is coated with a thin layer of liquid. Along with the liquid, impurities such as particles present in the bath can be transferred to the withdrawn substrate. Entrained particles locally modify the thickness of the film, hence altering the quality and properties of the coating. In this study, we show that it is possible to entrain the liquid alone and avoid contamination of the substrate, at sufficiently low withdrawal velocity in diluted suspensions. Using a model system consisting of a plate exiting a liquid bath, we observe that particles can remain trapped in the meniscus which exerts a resistive capillary force to the entrainment. We characterize different entrainment regimes as the withdrawal velocity increases: from a pure liquid film, to a liquid film containing clusters of particles, and eventually individual particles. This capillary filtration is an effective barrier against the contamination of substrates withdrawn from a polluted bath and finds application against biocontamination.
