Plastron-Mediated Growth of Captive Bubbles on Superhydrophobic Surfaces

详细信息    查看全文

• 作者：So Hung Huynh ; Alifa Afiah Ahmad Zahidi ; Murat Muradoglu ; Brandon Huey-Ping Cheong ; Tuck Wah Ng
• 刊名：Langmuir
• 出版年：2015
• 出版时间：June 23, 2015
• 年：2015
• 卷：31
• 期：24
• 页码：6695-6703
• 全文大小：578K
• ISSN：1520-5827

文摘

Captive bubbles on a superhydrophobic (SH) surface have been shown to increase in volume via injection of air through the surrounding plastron. The experimental contact diameter against volume trends were found to follow that predicted by the Surface Evolver simulation generally but corresponded with the simulated data at contact angle (CA) = 158掳 when the volume was 20 渭L but that at CA = 170掳 when the volume was increased to 180 渭L. In this regime, there was a simultaneous outward movement of the contact line as well as a small reduction in the slope that the liquid鈥揳ir interface makes with the horizontal as air was injected. At volumes higher than 180 渭L, air injection caused the diameter to reduce progressively until detachment. The inward movement of the contact line in this regime allowed the bubble body to undergo shape deformations to stay attached onto the substrate with larger volumes (300 渭L) than predicted (220 渭L at CA = 170掳) using simulation. In experiments to investigate the effect of translating the SH surface, movement of captive bubbles was possible with 280 渭L volume but not with 80 渭L volume. This pointed to the possibility of transporting gas-phase samples on SH surfaces using larger captive bubble volumes.