Queensland Micro- and Nanotechnology Centre, Griffith University , 170 Kessels Road, Nathan, Queensland 4111, Australia.
Chemical Engineering and Biotechnology Department, Ariel University , P.O.B. 3, Ariel 40700, Israel.
Langmuir. 2016 Jun 21;32(24):6097-104. doi: 10.1021/acs.langmuir.6b01272. Epub 2016 Jun 9.
Liquid marble is a liquid droplet coated with particles. Recently, the evaporation process of a sessile liquid marble using geometric measurements has attracted great attention from the research community. However, the lack of gravimetric measurement limits further insights into the physical changes of a liquid marble during the evaporation process. Moreover, the evaporation process of a marble containing a liquid binary mixture has not been reported before. The present paper investigates the effective density and the effective surface tension of an evaporating liquid marble that contains aqueous ethanol at relatively low concentrations. The effective density of an evaporating liquid marble is determined from the concurrent measurement of instantaneous mass and volume. Density measurements combined with surface profile fitting provide the effective surface tension of the marble. We found that the density and surface tension of an evaporating marble are significantly affected by the particle coating.
液滴包埋颗粒形成的液滴即为液滴包埋，最近，使用几何测量法对固着液滴包埋的蒸发过程引起了研究界的广泛关注。然而，缺少重量测量限制了进一步深入了解液滴包埋在蒸发过程中的物理变化。此外，以前没有报道过含有液体二元混合物的液滴包埋的蒸发过程。本文研究了含有低浓度乙醇水溶液的蒸发液滴包埋的有效密度和有效表面张力。蒸发液滴包埋的有效密度是通过同时测量瞬时质量和体积来确定的。密度测量结合表面轮廓拟合提供了液滴包埋的有效表面张力。我们发现，蒸发液滴包埋的密度和表面张力受颗粒包覆显著影响。
