Slip-stick wetting and large contact angle hysteresis on wrinkled surfaces

Deterministic Order in Surface Micro‐Topologies through Sequential Wrinkling

“…Micromechanical models using the finite element method (FEM) are carried out to reveal the underlying buckling mechanisms as well as the evolution of wrinkling patterns during simultaneous and sequential release of prestrains (see Methods and Supporting Information Section S1). Upon simultaneous release of a small equi‐biaxial prestrain of 2.5%, the film undergoes equi‐biaxial compression and the resulting herringbone pattern shows a jog angle of 90° (Figure S1a), consistent with herringbone patterns reported in the literature using thermal deposition and solvent swelling approaches 1, 7, 27. For sequential release of the same equi‐biaxial prestrain, the final pattern is obtained through two intermediate steps ( Figure ): first, after release of the prestrain in the x ‐axis, out‐of‐plane buckling occurs and a 1D wrinkle forms; second, upon release of the second prestrain in the y ‐axis, the 1D waves laterally buckle within the plane, forming the herringbone pattern with jog angle of 90° (Figure S2a).…”

“…Wrinkling surface patterns in soft materials have become increasingly important over a broad range of applications, including stretchable electronics,1, 2 thin film material properties measurement,3 tunable adhesion4, 5 and wettability,6, 7 electrospun fiber surface topologies,8 plant morphogenesis,9 micro fluidic channels,10 and photonics 11. Wrinkled surface topologies occur when out‐of‐plane bending of the coating is energetically favored over compression.…”

Contact angle and impinging process of droplets on partially grooved hydrophobic surfaces

“…The energy barrier refers to the free energy difference between a local minimum and an adjacent maximum in the direction of the moving three-phase contact line [26,43] . The three-phase contact line moves continuously and smoothly parallel to the grooves, indicating that there is little energy barrier when moving parallel to grooves.…”

Resistance to weathering and retreatability of composite protective nanostructured coatings applied to Pendelikon marbles

“…The critical three-phase (air -liquid -solid) contact line is defined by the intrinsic surface topography and roughness; in addition the interfacial pore geometry modulates and retreats across that line (Nakanishi & Fisher 1982;De Gennes 1985;Brostow et al 2003;Myshkin et al 2003Myshkin et al , 2005Feng et al 2004;Li et al 2006;Brostow et al 2010;Bukowsky et al 2011;Cheong et al 2013) .…”