用反射laser光束测量接触角和弯月面形状
Measuring contact angle and meniscus shape with a reflected laser beam
摘要：
延伸的平面固体表面和液体之间的接触角的侧视图成像是有问题的。即使将视图完全平行于接触线对齐，也不可能聚焦接触线的一个点。我们描述了一种新的测量技术，用于确定接触角与移动接触线上的加宽的激光片的反射。我们验证了这种新技术测量的接触角的圆柱体，旋转部分浸入液体。激光片相对于未扰动的液体表面以角度$φ$倾斜，并从弯月面反射。在屏幕上收集的反射图像包含确定接触角的信息。当通过将网格放置到光束路径中将激光片分割成激光射线阵列时，可以从反射图像重建弯月面的形状。我们验证了该方法通过测量后退接触角与速度的十六烷基三甲基溴化铵水溶液上光滑的疏水化以及粗糙的聚苯乙烯表面。
英文摘要：
Side-view imaging of the contact angle between an extended planar solid surface and a liquid is problematic. Even when aligning the view perfectly parallel to the contact line, focusing one point of the contact line is not possible. We describe a new measurement technique for determining contact angles with the reflection of a widened laser sheet on a moving contact line. We verified this new technique measuring the contact angle on a cylinder, rotating partially immersed in a liquid. A laser sheet is inclined under an angle $φ$ to the unperturbed liquid surface and is reflected off the meniscus. Collected on a screen, the reflection image contains information to determine the contact angle. When dividing the laser sheet into an array of laser rays by placing a mesh into the beam path, the shape of the meniscus can be reconstructed from the reflection image. We verified the method by measuring the receding contact angle versus speed for aqueous cetyltrimethyl ammonium bromide solutions on a smooth hydrophobized as well as on a rough polystyrene surface.
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