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.…”

“…A c c e p t e d M a n u s c r i p t 10 and polarity) and the surface structure [33]. For ethanol droplet, its smaller surface tension and polarity can weaken its adhesive effect with the lubricant, while its sliding speed is smaller than the water droplet (of same volume).…”

“…In addition to this, some methods and materials of soft lithography [14,15,24], colloidal templating [25], electrodeposition [18,[26][27][28], electrospray [29], layer-by-layer deposition [30], electrowetting [31,32], superhydrophobic silicon nanofilaments [33], nanoporous cellulose lauroyl ester [34], and porous polyelectrolyte multilayer [35] have been successfully employed as the holding structures for lubricant infiltration, but they are also plagued with some problems, such as process complexity and large requirement of time and money. Herein, we prepared transparent self-cleaning SLIPS with breath figure patterns (BFPs) formed on the glass substrates based on our previous work regarding BFPs preparation using an enhanced breath figure method (BFM) [36].…”

Slippery Liquid-Infused Porous Surfaces that Prevent Bacterial Surface Fouling and Inhibit Virulence Phenotypes in Surrounding Planktonic Cells

“…3,4 The work reported here was motivated broadly by the recent development of slippery liquid-infused porous surfaces (or ‘SLIPS’), 5–11 which have many physical properties and behaviors that render them well suited for the design of anti-biofouling surfaces. These ‘slippery’ materials consist of a porous or textured surface infused with a viscous liquid (e.g., perfluorinated lubricants, 5,11,12 silicone oil, 8,13,14 etc.). This general design maintains the infused liquid as a thin, dynamic film at the surface, creating a hydrophobic or omniphobic interface that allows other fluids and substances to easily slide or ‘slip’ off the surface with sliding angles as low as 2°.…”

Polysiloxane/multiwalled carbon nanotubes nanocomposites and their applications as ultrastable, healable and superhydrophobic coatings

“…Coating of surfaces with organosilanes is well known because of its fine properties and simplicity [34]. We have prepared a series of superhydrophobic and superoleophobic surfaces with excellent properties using organosilanes [35][36][37][38]. Carbon nanotubes are frequently used for fabricating superhydrophobic surfaces owing to their high aspect ratio [39][40][41][42][43], but the durability of the surfaces remains to be improved.…”