Roy Pritam Kumar, Binks Bernard P, Bormashenko Edward, Legchenkova Irina, Fujii Syuji, Shoval Shraga
Chemical Engineering Department, Engineering Faculty, Ariel University, P.O.B. 3, 407000 Ariel, Israel.
Department of Chemistry and Biochemistry, University of Hull, Hull HU6 7RX, UK.
J Colloid Interface Sci. 2020 Sep 1;575:35-41. doi: 10.1016/j.jcis.2020.04.066. Epub 2020 Apr 18.
Liquid marbles are non-stick droplets coated with colloidal usually hydrophobic particles. We suggest that "composite" liquid marbles, i.e. bi-liquid droplets, may be prepared with water droplets coated by a thin silicone oil layer containing hydrophobic, colloidal particles.
The process enabling manufacturing water marbles coated with silicone oil containing fumed fluorosilica particles is reported. The marbles remained stable when placed on solid and liquid supports. Bouncing and coalescence of the composite marbles was explored.
Non-coalescence prolonged (ca. 20 min) jumping of composite marbles above a vibrating water bath was observed. Composite marbles withstand coalescence better than colloidal particle-stabilized liquid marbles. The effective surface tension of the composite marbles is markedly lower than that of water marbles coated with fumed fluorosilica particles. The coefficient of restitution of the composite marbles bouncing on a hydrophobic solid substrate is lower than that established for water marbles. This observation is related to the viscous dissipation occurring within the silicone layer making up the composite marbles.
液弹是涂覆有通常为疏水性胶体颗粒的不粘液滴。我们认为“复合”液弹，即双液滴，可以由涂有含疏水性胶体颗粒的薄硅油层的水滴制备而成。
报道了制备涂覆有含气相二氧化硅颗粒的硅油的水弹的过程。当放置在固体和液体支撑物上时，这些弹珠保持稳定。对复合弹珠的弹跳和聚并进行了研究。
观察到复合弹珠在振动水浴上方的非聚并延长（约20分钟）跳跃。复合弹珠比胶体颗粒稳定的液弹更能抵抗聚并。复合弹珠的有效表面张力明显低于涂覆有气相二氧化硅颗粒的水弹。复合弹珠在疏水性固体基质上弹跳的恢复系数低于水弹的恢复系数。这一观察结果与构成复合弹珠的硅油层内发生的粘性耗散有关。
