Durability Improvement of Synthetic Dry Adhesives by Metal Coatings

Table 3

Comparison of the bending stiffness of SDAs with and without metal coatings and the surface energy of the coating metals.

	Stiffness; (GPa)	Coating thickness; (nm)	Bending stiffness; (Nm^2)	Surface energy; (mN/m)
Indium	12.7	4	3.22 × 10^−13	560
Zinc	96.5	8	4.14 × 10^−12	989
Gold	77	6	2.50 × 10^−12	1700
PDMS	0.00132	—	5.25 × 10^−14	23