Figure 2
From: Biomimicking lubrication superior to fish skin using responsive hydrogels
The COF curves of (a) the pNIPAM5–NaMA1 gel; (b) the pNIPAM5–NaMA2 gel at pH=7, rt; pH=2, rt; and pH=2 at 32 °C; and (c) The ΔCOF of the pNIPAM–NaMA gels in neutral and acidic surroundings. COF, coefficient of friction; NaMA, sodium methacrylate; pNIPAM, poly N-isopropyl-acrylamide; rt, room temperature.
