Abstract
AbstractReversible attachment on soft substrates is useful in a range of applications, including soft robotics and soft‐tissue surgical instrumentation. On rigid substrates, the use of micropatterned adhesives has been extensively explored. It has been shown that surface micropatterns provide conformability, thereby enabling the formation and preservation of contact with the substrate. On soft, deformable substrates, on the other hand, surface micropatterns largely lose their functionality. Alternative mechanisms have to be explored to maximize conformability and thus formation and preservation of contact on soft substrates. 3D‐printing is used to fabricate adhesives with internal cylindrical pores of various configurations leading to different combinations of high/low normal/shearing stiffness, and shear forces are measured on glass and on soft elastomeric substrates. On the glass substrate, shear forces are highest for the adhesives with the lowest normal stiffness, independently from their shear stiffness. On the soft substrates, the highest shear forces are achieved for the adhesives combining low normal stiffness, enabling contact formation, with high shear stiffness, promoting contact preservation. The beneficial effect of such anisotropic stiffness on shear forces increased with the deformability of the substrate.
Highlights
Peter van Assenbergh,* Frank Haring, Joshua A
The adhesives were 20 × 20 × 5 mm3 in size and contained either a single row of cylindrical pores of 2.7 mm in diameter separated by pore walls with a 0.5 mm thickness at their thinnest position, or a double row of pores of 1.28 mm in diameter separated by pore walls with a 0.15 mm thickness at their thinnest position
We found that adhesives with internal pores generated higher shear forces compared to UNP adhesives, and that higher shear forces are generated with adhesives with a single row of pores with a double row of pores
Summary
Peter van Assenbergh,* Frank Haring, Joshua A. On and the substrate and preservation of the formed contact when external loads are applied.[5,6] for strong, yet reversible attachment, an adhesive should fulfil two contradictory properties simultasoft, deformable substrates, on the other hand, surface micropatterns largely neously: high deformability in the normal lose their functionality. 3D-printing is used to fabricate adhesives with internal cylindrical pores of various configurations leading to different combinations of high/low normal/shearing stiffness, and shear forces are measured on glass and on tion, and low deformability in the loading direction, leading to preservation of the formed contact when loads are applied.[7] The presence of such direction-dependent stiffness in a material is commonly soft elastomeric substrates. The highest shear forces are achieved for the adhesives combining low normal stiffness, enabling contact formation, with high shear stiffness, promoting contact preservation. Introduction tive elasticity of the adhesive, leading to better contact formation than unpatterned adhesives.[5,11,18] surface
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