使用漂浮的疏水粉末和悬浮的水滴形成的分级液体弹珠。
Hierarchical liquid marbles formed using floating hydrophobic powder and levitating water droplets.
作者信息
Kumar Roy Pritam, Binks Bernard P, Shoval Shraga, Dombrovsky Leonid A, Bormashenko Edward
机构信息
Chemical Engineering Department, Engineering Faculty, Ariel University, P.O.B. 3, 407000 Ariel, Israel.
Department of Chemistry, University of Hull, Hull HU6 7RX, UK.
出版信息
J Colloid Interface Sci. 2022 Nov 15;626:466-474. doi: 10.1016/j.jcis.2022.06.168. Epub 2022 Jul 1.
HYPOTHESIS
Liquid marbles i.e. droplets coated by hydrophobic particles may be formed not only on the solid substrates but also on the floating layers of hydrophobic powders such as fluorinated fumed silica or polytetrafluoroethylene.
EXPERIMENTS
Formation and growth of liquid marbles on fluorinated fumed silica or polytetrafluoroethylene powder floating on a heated water-vapor interface is reported. Marbles emerge from condensation of water droplets levitating above the powder layer.
FINDINGS
The kinetics of the growth of droplets is reported. Growth of droplets results from three main mechanisms: water condensation, absorption of small droplets and merging of droplets with neighboring ones. Growing droplets are coated with the hydrophobic powder, eventually giving rise to the formation of stable liquid marbles. Formation of hierarchical liquid marbles is reported. Growth of liquid marbles emerging from water condensation follows the linear temporal dependence. A phenomenological model of the liquid marble growth is suggested.
假设
液滴弹珠，即由疏水颗粒包覆的液滴，不仅可能在固体基底上形成，也可能在诸如氟化气相二氧化硅或聚四氟乙烯等疏水粉末的漂浮层上形成。
实验
报道了在漂浮于加热的水汽界面上的氟化气相二氧化硅或聚四氟乙烯粉末上液滴弹珠的形成与生长情况。弹珠由悬浮在粉末层上方的水滴凝结而成。
发现
报道了液滴生长的动力学情况。液滴的生长源于三种主要机制：水的凝结、小液滴的吸收以及液滴与相邻液滴的合并。生长中的液滴被疏水粉末包覆，最终形成稳定的液滴弹珠。报道了分级液滴弹珠的形成。由水凝结产生的液滴弹珠的生长遵循线性时间依赖性。提出了液滴弹珠生长的唯象模型。
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