Advances and challenges in slippery covalently-attached liquid surfaces

Nanostructure Explains the Behavior of Slippery Covalently Attached Liquid Surfaces

“… Chain length (a, d): If snow‐jet cleaned samples are ignored, a minimum in CAH is observed at intermediate $${\hat N_{\rm{n}} }$$ by both NR and AFM‐SMFS (40 and 80 repeat units, respectively) consistent with previous studies [3,11,15,21] . Snow‐jet cleaned samples (i.e., K5), which have similar chain lengths but different grafting densities, break this trend, indicating that SCALS cannot be described by $${\hat N_{\rm{n}} }$$ alone. Thickness (b, e): Consistent with trends in the existing literature, [4] Figure 6 shows a CAH minimum at intermediate layer thickness (between 2 and 5 nm) as measured by both NR and ellipsometry. This trend with thickness is present even across snow‐jet cleaned samples. Grafting density : No consistent trend was observed between σ and CAH; data is plotted in Figure S14. Reduced grafting density (c, f): All samples studied here exhibit a minimum CAH at either Σ=2 (AFM‐SMFM) or Σ=2.5 (NR‐nSCFT). …”

Droplet detachment force and its relation to Young–Dupre adhesion

“…More recently developed surfaces, such as lubricated 21,22 and slippery covalently-attached liquid (SCAL) surfaces, 34 typically exhibit θ r ∼ 90°, r ∼ R , and 1 + cos θ r ∼ 1, cos θ r − cos θ a ∼ 10 −3 . 35–37 Hence, F d / F fric ∼ 10 3 .…”

“…33 Hence, F d /F fric = R/r B 10, i.e., it is easier to move a droplet on a superhydrophobic surface by applying a lateral force as compared to a vertical force. More recently developed surfaces, such as lubricated 21,22 and slippery covalently-attached liquid (SCAL) surfaces, 34 typically exhibit y r B 901, r B R, and 1 + cos y r B 1, cos y r À cos y a B 10 À3 . [35][36][37] Hence, F d /F fric B 10 3 .…”

Transparent Liquid-like Slippery Coating with Excellent Photothermal Performance and Durability for Anti-/De-Icing Applications

“…Nevertheless, the micronano structures of SHSs are susceptible to damage, resulting in poor durability. , Another research focus of active anti-icing is the Slippery Liquid-Infused Porous Surfaces (SLIPSs) inspired by pitcher plants. − SLIPSs have extremely low ice adhesion strength, which benefits the removal of ice. However, the loss of the SLIPSs lubricants is also an inherent issue, thus limiting their practical application. , Liquid-like surfaces are a type of coating that covalently connects flexible molecular chains or molecular brushes to the surface, without the need to create complex micro- and nanoporous structures. − This overcomes the limitations of SHSs and SLIPSs; thus, there has been a growing research emphasis on the exploration of liquid-like surfaces. − Hao et al prepared liquid-like surfaces with excellent stability and durability by grafting the long molecule chain of polydimethylsiloxane on a substrate with covalent bonds. Zhang et al reported a liquid-like ice-shedding coating with extremely low ice adhesion .…”