Nepenthes Pitcher Inspired Anti‐Wetting Silicone Nanofilaments Coatings: Preparation, Unique Anti‐Wetting and Self‐Cleaning Behaviors

Abstract

Nepenthes pitcher inspired anti-wetting coatings, fl uoro-SNs/Krytox, are successfully fabricated by the combination of fl uoro-silicone nanofi laments (fl uoro-SNs) and Krytox liquids, perfl uoropolyethers. Fluoro-SNs with different microstructure are grown onto glass slides using trichloromethylsilane by simply repeating the coating step, and then modifi ed with 1 H, 1 H, 2 H, 2 Hperfl uorodecyltrichlorosilane. Subsequently, the Krytox liquid is spread on the fl uoro-SNs coatings via capillary effect. The fl uoro-SNs/Krytox coatings feature ultra-low sliding angle for various liquids, excellent stability, and transparency. The sliding speed of liquid drops on the fl uoro-SNs/Krytox coating is obviously slower than on the lotus inspired superhydrophobic and superoleophobic coatings, and is controlled by composition of the coating (e.g., morphology of the fl uoro-SNs, type of Krytox and its thickness) and properties of the liquid drops (e.g., density and surface tension). In addition, the self-cleaning property of the fl uoro-SNs/Krytox coating is closely related to properties of liquid drops and dirt.

Transparent self-cleaning lubricant-infused surfaces made with large-area breath figure patterns

“…5a and 5b or comparing Fig. 5c and 5d), it was evident that sliding speed of the water droplet is larger than that of the ethanol droplet under the same conditions, which is consistent with Zhang's report [33]. Furthermore, the sliding speed of the liquid droplet increases slightly with the decrease in pore size (see each of the four figures in Fig.…”

Transparent self-cleaning lubricant-infused surfaces made with large-area breath figure patterns

“…5a and 5b or comparing Fig. 5c and 5d), it was evident that sliding speed of the water droplet is larger than that of the ethanol droplet under the same conditions, which is consistent with Zhang's report [33]. Furthermore, the sliding speed of the liquid droplet increases slightly with the decrease in pore size (see each of the four figures in Fig.…”

Evaporation-Induced Transition from Nepenthes Pitcher-Inspired Slippery Surfaces to Lotus Leaf-Inspired Superoleophobic Surfaces

“…Liquid drops need a few seconds or even a few minutes to slide down a wafer scale, e.g., 40 mm, NP-inspired surface (Movie S2). A similar phenomenon was also observed by Hozumi et al on the statically oleophilic but dynamically oleophobic smooth surface . However, as is well known, liquid drops could roll off a tilted LL-inspired superhydrophobic or superoleophobic surface in the twinkling of an eye.…”

Temperature-Responsive Anisotropic Slippery Surface for Smart Control of the Droplet Motion

“…The differences between SAs of various droplets on the same surfaces were depending on many physical parameters of the liquids, such as surface tension, viscosity, polarity, and density. 28,69,70 These results showed that the SAs of various droplets are different on the same slippery surface.…”

“…Here, switching the temperature enabled control over the motion of glycerol, DMSO, and ionic liquid in different TAs, which corresponded to the critical SAs in the parallel directions within a reasonable error range. The differences between SAs of various droplets on the same surfaces were depending on many physical parameters of the liquids, such as surface tension, viscosity, polarity, and density. ,, These results showed that the SAs of various droplets are different on the same slippery surface.…”

Transparent self-cleaning lubricant-infused surfaces made with large-area breath figure patterns

“…5a and 5b or comparing Fig. 5c and 5d), it was evident that sliding speed of the water droplet is larger than that of the ethanol droplet under the same conditions, which is consistent with Zhang's report [33]. Furthermore, the sliding speed of the liquid droplet increases slightly with the decrease in pore size (see each of the four figures in Fig.…”

Evaporation-Induced Transition from Nepenthes Pitcher-Inspired Slippery Surfaces to Lotus Leaf-Inspired Superoleophobic Surfaces

“…Liquid drops need a few seconds or even a few minutes to slide down a wafer scale, e.g., 40 mm, NP-inspired surface (Movie S2). A similar phenomenon was also observed by Hozumi et al on the statically oleophilic but dynamically oleophobic smooth surface . However, as is well known, liquid drops could roll off a tilted LL-inspired superhydrophobic or superoleophobic surface in the twinkling of an eye.…”

Temperature-Responsive Anisotropic Slippery Surface for Smart Control of the Droplet Motion

“…The differences between SAs of various droplets on the same surfaces were depending on many physical parameters of the liquids, such as surface tension, viscosity, polarity, and density. 28,69,70 These results showed that the SAs of various droplets are different on the same slippery surface.…”

“…Here, switching the temperature enabled control over the motion of glycerol, DMSO, and ionic liquid in different TAs, which corresponded to the critical SAs in the parallel directions within a reasonable error range. The differences between SAs of various droplets on the same surfaces were depending on many physical parameters of the liquids, such as surface tension, viscosity, polarity, and density. ,, These results showed that the SAs of various droplets are different on the same slippery surface.…”

Transparent self-cleaning lubricant-infused surfaces made with large-area breath figure patterns

“…5a and 5b or comparing Fig. 5c and 5d), it was evident that sliding speed of the water droplet is larger than that of the ethanol droplet under the same conditions, which is consistent with Zhang's report [33]. Furthermore, the sliding speed of the liquid droplet increases slightly with the decrease in pore size (see each of the four figures in Fig.…”

Evaporation-Induced Transition from Nepenthes Pitcher-Inspired Slippery Surfaces to Lotus Leaf-Inspired Superoleophobic Surfaces

“…Liquid drops need a few seconds or even a few minutes to slide down a wafer scale, e.g., 40 mm, NP-inspired surface (Movie S2). A similar phenomenon was also observed by Hozumi et al on the statically oleophilic but dynamically oleophobic smooth surface . However, as is well known, liquid drops could roll off a tilted LL-inspired superhydrophobic or superoleophobic surface in the twinkling of an eye.…”

Temperature-Responsive Anisotropic Slippery Surface for Smart Control of the Droplet Motion

“…The differences between SAs of various droplets on the same surfaces were depending on many physical parameters of the liquids, such as surface tension, viscosity, polarity, and density. 28,69,70 These results showed that the SAs of various droplets are different on the same slippery surface.…”

“…Here, switching the temperature enabled control over the motion of glycerol, DMSO, and ionic liquid in different TAs, which corresponded to the critical SAs in the parallel directions within a reasonable error range. The differences between SAs of various droplets on the same surfaces were depending on many physical parameters of the liquids, such as surface tension, viscosity, polarity, and density. ,, These results showed that the SAs of various droplets are different on the same slippery surface.…”