Australian Pulp and Paper Institute, Department of Chemical Engineering, Monash University, Clayton, 3800, Australia.
Langmuir. 2011 Nov 1;27(21):12923-9. doi: 10.1021/la2014682. Epub 2011 Oct 6.
The capillary rise and Wilhelmy plate methods have been used to study the "surface tension" of water marbles encapsulated with polytetrafluoroethylene (PTFE) powders of 1-, 35-, and 100-μm particle size. With the capillary rise technique, a glass capillary tube was inserted into a water marble to measure the capillary rise of the water. The Laplace pressure exerted by the water marble was directly measured by comparing the heights of the capillary rise from the marble and from a flat water surface in a beaker. An equation based on Marmur's model was proposed to calculate the water marble surface tension. This method does not require the water contact angle with the supporting solid surface to be considered; it is therefore a simple but efficient method for determining liquid marble surface tension. The Wilhelmy method was used to measure the surface tension of a flat water surface covered by PTFE powder. This method offers a new angle for investigating liquid marble shell properties. A discussion on the nature and the realistic magnitude of liquid marble surface tension is offered.
使用毛细上升和威尔海姆平板法研究了用粒径为 1μm、35μm 和 100μm 的聚四氟乙烯（PTFE）粉末包裹的水弹珠的“表面张力”。使用毛细上升技术，将玻璃毛细管插入水弹珠中，测量水的毛细上升高度。通过比较从弹珠和烧杯中水平水面上升的高度，直接测量由水弹珠施加的拉普拉斯压力。提出了一个基于 Marmur 模型的方程来计算水弹珠的表面张力。该方法不需要考虑水与支撑固体表面的接触角，因此是一种简单但有效的确定液体弹珠表面张力的方法。威尔海姆法用于测量覆盖有 PTFE 粉末的平面水面的表面张力。该方法为研究液体弹珠壳性质提供了一个新的角度。对液体弹珠表面张力的性质和实际大小进行了讨论。
