Fabricating patterned microstructures by embedded droplet printing on immiscible deformable surfaces

다국어 초록 (Multilingual Abstract)

The deposition of droplets inside the deformable surfaces has attracted researchers for decades due to itsapplication in direct-writing microporous polymer architectures, printing embedded flexible wires, patterningfunctional nanoparticles, etc. Herein, a patterned microstructure method based on droplets,named as the embedded droplet printing (EDP), is proposed. The experiments were conducted at aWeber number of 5.49–17.7 to explore the impact outcome, spreading laws and embedded morphologyof the droplets. The rebound of droplets impacting the viscous surface was suppressed under appropriateconditions. The spreading factor of the droplet impacting on the high viscous surface followed the powerlaw d*/ t a. However, the exponent a was observed to be in the range 0.042–0.031, much smaller than thereported values (0.1–1), which could be explained by the Oh number. The diameters of droplets wrappedwith viscous PDMS were only about 1/6th as compared to the spreading on the surface of PDMS precuredfor 30 min. In particular, a domain map was plotted in which patterns of solid bracts, plates and coffeerings were printed. Overall, EDP is a promising candidate to tailor the size, depth and morphology of dropletsfor preparing the patterned microstructures inside the soft materials.

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