Super Antiwetting Surfaces for Mitigating Drag-Out of Deep Eutectic Solvents

Abstract

Deep eutectic solvents (DESs) are, at room temperature, about dozens to hundreds of times more viscous than water, which brings pretty thick residues on solid surfaces, for example, causing drag-out and weight loss in the transfer process. Unfortunately, until now little work had been done for solving this knotty problem. In this study, the super antiwetting surface, i.e., super-DES-phobic surface (defined as DES contact angle > 150°) is proposed and fabricated successfully by a facile coating technique. Hierarchical silver dendrites on copper foam substrate provide effective dual-roughness surfaces showing stable superDESphobicity. The superDESphobic surface can repel the DESs and their derived solutions even under elevated temperature of about 120 °C and the impact attack of drops. It is also found that the superDESphobic surface can significantly delay the DESs freezing and reduce the adhesion strength of the frozen DESs. Interestingly, the superDESphobic surface can be applied as an effective tool for gauging the density of DES using an ∼2 μL droplet in virtue of its super antiwetting property. The super antiwetting surfaces show promise for potential applications in DES self-cleaning and antifreezing.

A self-roughened and biodegradable superhydrophobic coating with UV shielding, solar-induced self-healing and versatile oil–water separation ability

“…Superhydrophobic surfaces with the water contact angle (CA) more than 150º and the sliding angle (SA) less than 10º have exhibited excellent application potential in many fields, such as oil-water separation, [1][2][3] self-cleaning, [4][5] water collection, [6][7][8] liquid transport, [9][10] anti-corrosion, [11][12] anti-icing [13][14] and drag reduction. [15][16][17] It is well-known that the representative construction strategy of superhydrophobic coatings mainly includes two crucial factors: micro/nano structures and low surface energy components. The common construction approaches include dip-coating, [18][19] spray-coating, 20-21 etching, [22][23] chemical vapor deposition (CVD), 24-25 electrophoretic deposition [26][27] and so on.…”

Facile Fabrication of Robust Superhydrophobic Ice Shedding Coating with Superior Corrosion Resistance and Temperature Durability

“…Meanwhile, the superhydrophobic surface structures can capture air to form air pockets, and these air pockets can form a thermal barrier between the surface and water droplets. Eventually, the droplet freezing temperature is reduced and icing is delayed . Superhydrophobic surfaces can reduce the surface contact area with water, thus slowing the formation of ice crystals and minimizing heat transfer .…”

Spreading of Water Droplets on Cellulose-Based Papers: the Effect of Back-Surface Coating

“…Controlling the wetting and spreading of water on solid surfaces is of practical importance for a variety of applications, such as waterproofing, − anti-icing, , antioxidation, , self-cleaning, , etc. There are various techniques available to form superhydrophobic surfaces with contact angles larger than 150° and rolling angles less than 10°, i.e., surfaces of low wettability.…”