Research on Response Regulation of Pressure-driven Multi-droplet Wetting State

The liquid-liquid interface spreading engineering has a wide range of applications. Surfaces with controllable wettability can be stimulated to realize the modulation of the wettability state, which is of great importance in nanofluidics, medical field, and materials science. The motion of the three-phase contact line has self-similarity, and the spreading radius and the spreading time are proportional to the power exponential relationship of R~tⁿ and the dynamic mechanism of spreading during infiltration can be reflected through the power index n. In this paper, the liquid-liquid interface wetting problem with surfactant solution as the substrate is investigated on a macroscopic scale, and the intrinsic mechanism of the interfacial monolayer of active agent molecules in the process of changing the dynamic wettability of the liquid is analyzed. The wetting experimental system composed of n-hexadecane as the driven droplet and sodium dodecyl sulfate solution as the base solution was established by changing the droplet spreading state by pulling pressure to drive the liquid surface, and the dynamic response of the wetting state was realized. On the basis of single droplet, the synergistic wetting state of double droplet and triple droplet was realized. The work of this paper gives new ideas and means for liquid interface manipulation, which is expected to be applied in interface assembly technology.