Growing up in a rough world: scaling of frictional adhesion and morphology of the Tokay gecko (Gekko gecko)

• Anthony J. Cobos and
• Timothy E. Higham

Beilstein J. Nanotechnol. 2022, 13, 1292–1302, doi:10.3762/bjnano.13.107

• adhesive pads is the contact area between the setae and the surface. With increasingly rough surfaces, the area for contact decreases, leading to decreased adhesive performance. In a modeling framework, the force of adhesion can be related to surface energy of the substrate, the area of the adhering pad

Adhesive contact of rough brushes

• Qiang Li and
• Valentin L. Popov

Beilstein J. Nanotechnol. 2018, 9, 2405–2412, doi:10.3762/bjnano.9.225

• control. If the surface exhibits macroscopic adhesion, the normal force at the moment of complete detachment will be negative; its absolute value is called the force of adhesion, FA. Let us introduce some characteristic quantities which can be used for comparison with results for brushes: 1. A natural

• -ended square indenter is slightly larger than that predicted by Equation 2. 2. As shown already in [19] and confirmed by detailed simulations in [10], the detachment of a flat brush structure (without height distribution), occurs very similar to that of a continuous square, while the force of adhesion

• effective work of adhesion, γρ. The force of adhesion of a flat brush is a natural reference for comparison with rough brushes. 3. For characterization of the role of the statistical distribution of the pillar height, we consider the critical separation, the point at which the adhesive contact of one single

Measuring adhesion on rough surfaces using atomic force microscopy with a liquid probe

• Juan V. Escobar,
• Cristina Garza and
• Rolando Castillo

Beilstein J. Nanotechnol. 2017, 8, 813–825, doi:10.3762/bjnano.8.84

• adhesion between a single peak or protrusion and the liquid drop. This procedure could provide useful microscopic information to improve our understanding of wetting phenomena on rough surfaces. Keywords: atomic force microscopy; force of adhesion; functionalized-tip cantilevers; liquid probe

• two solid surfaces (force of adhesion per unit area) that governs contact stresses and strongly influences friction. In such method, the force, Fadh, required to separate a tip from a flat solid sample is measured. Subsequently, a single-asperity continuum contact mechanics model is used to extract

• adhesion to interfacial roughness showing a drop in Fadh of more than an order of magnitude with increasing roughness, down to the atomic limit [9]. In this paper, we present a procedure to measure the force of adhesion between a liquid drop and rough surfaces, in which a micrometric liquid drop replaces