Figure 3. Characterizing the viscosity of GaIn10-based liquid metal ink flowing on the paper with a slope angle of 45^o through high-speed camera.

(A) Optical image of liquid metal ink flowing on the paper. (B) Acceleration variation of the droplet as a function of quantity of oxygen in 40g GaIn₁₀-based liquid metal ink, and the inset shows the sketch map of force analysis of the droplet in the flowing process.