Ultrafast Bubble Bursting by Superamphiphobic Coatings

Abstract

Controlling bubble motion or passively bursting bubbles using solid interfaces is advantageous in numerous industrial applications including flotation, catalysis, electrochemical processes, and microfluidics. Current research has explored the formation, dissolution, pinning, and rupturing of bubbles on different surfaces. However, the ability to tune and control the rate of bubble bursting is not yet achieved. Scaling down surface‐induced bubble bursting to just a few milliseconds is important for any application. In this work, the hierarchical structure of superamphiphobic surfaces is tuned in order to rapidly rupture contacting bubbles. Surfaces prepared using liquid flame spray show ultrafast bubble bursting (down to 2 ms) and superior durability. The coatings demonstrate excellent mechanical and chemical stability even in the presence of surface‐active species. Air from the ruptured bubble is absorbed into the aerophilic Cassie‐state. Long‐term applicability is demonstrated by preventing the accumulation of air in the plastron via a connection of the plastron to the environment. The times recorded for bubble rupture and complete reorganization of air are reduced by approximately a factor of 3 compared to previously reported values. The concept is utilized to passively control surfactant‐rich foam in froth flotation. Material collection efficiency increased by more than 60 times compared to controls.

Recent Advances in Photocatalysis Based on Bioinspired Superwettabilities

“…Different from bioinspired superhyrophophilicity, superhydrophobicity, patterned wetting, and (super)­amphiphobic materials were designed before the discovery of those inspired creatures. , Superamphiphobicity is the phenomenon where the CAs of water and various low surface tension oil drops are greater than 150° on a solid surface (Figure f). The oil-repellent surface requires much greater roughness and lower surface energies.…”

“…Superamphiphobic surfaces exhibit superoleophobicity and superhydrophobicity, repelling both organic oils and water (Figures g and f). Usually, superoleophobic surfaces also show superhydrophobicity due to the lower surface energies and complex structures. − However, there is a special model showing superoleophobicity as well as superhydrophilicity, resulting from mixtures of oleophobic fluorinated groups and hydrophilic groups. , …”

One‐Step Spraying Fabrication of Superomniphobic Coatings with Anti‐Flame, Anti‐Corrosive, and Mechanochemically Durable Ability

“…Compared with superhydrophobic surfaces which only repel water droplets, superomniphobic surface is more widely employed and has demonstrated enormous potential in medical testing, [1,2] droplet manipulation, [3,4] 3D printing, [5] liquid separation, [6,7] self-cleaning, [8,9] and so on. [10][11][12] The fabrication of a superomniphobic surface necessitates stringent and demanding criteria for the chemical composition as well as the micro/ nanostructure of the surface due to the very low surface tension of organic droplets. Recently, re-entrant structure [13] and doubly re-entrant structure [14] are two common structural models used to depict the superomniphobic surface.…”

Fluorine-Free Super-Liquid-Repellent Surfaces: Pushing the Limits of PDMS

“…Silica particles nucleate and grow. The time and process distance at which nanoparticles are collected determine their diameter, degree of aggregation, and the coating’s microscale roughness . A thin silica shell of approximately 10 nm was added by chemical vapor deposition to enhance the mechanical stability of the coatings.…”

“…The time and process distance at which nanoparticles are collected determine their diameter, degree of aggregation, and the coating's microscale roughness. 28 A thin silica shell of approximately 10 nm was added by chemical vapor deposition to enhance the mechanical stability of the coatings. For the sample LFS I, coated for 3 min at a 15 cm distance from the burner, nanoparticles with diameters of 83 ± 19 nm are aggregated into structures with heights between approximately 8 and 10 μm (Figure 1a, Inset red lines).…”