Skip to main content

Table 1 Water contact angle (CA) values, and friction properties of various biomimetic patterned surfaces at nano- and micro-scales

From: Biomimetic patterned surfaces for controllable friction in micro- and nanoscale devices

Surface CA (deg) Nano-scale friction force (nN) Micro-scale friction coefficient (μ) Ref
Silicon flat surface 22 20-28 0.46 [15]
SU-8 thin film 83 - 0.6 [30]
PMMA nano-patterns 99 0.84-1.97 0.33 [13]
DLC nano-dot surfaces 95 0.98-1.63 0.13 [23]
PMMA micro-patterns (Replicated Surfaces) 91-106 - 0.11-0.13 [25, 26]
Silicon micro-pillars 59 - 0.16 [29]
Silicon micro-pillars coated with DLC 145 - 0.12 [29]
Silicon micro-pillars coated with ZDOL 105 - 0.08 [29]
SU-8 micro-patterns 105 - 0.3 [30]
SU-8 micro-patterns coated with PFPE 108 - 0.19 [30]
SU-8 micro-patterns treated with Ar and coated with PFPE 83 - 0.21 [30]
SU-8 micro-patterns treated with O2 and coated with PFPE 91 - 0.22 [30]
  1. In these works, atomic force microscope and micro-tribotesters were used to measure friction at nano- and micro-scales, respectively.