title: In Situ Observation of Dynamic Wetting Transition in Re-Entrant Microstructures.
abstract: Re-entrant microstructures exhibit excellent wetting stability under different pressure levels, but the underlying mechanism determined by wetting transition behavior at the microscale level remains unclear. We propose the "wetting chip" method for in situ assessment of the dynamic behavior of wetting transition in re-entrant microstructures. High sag and transverse depinning were observed in re-entrant microstructures. Analysis indicated that high sag and transverse depinning mainly influenced the stability of the structures. The threshold pressure and longevity of wetting transition were predicted and experimentally verified. The design criteria of wetting stability, including small geometry design, hydrophobic material selection, and sidewall condition, were also presented. The proposed method and model can be applied to different shapes and geometry microstructures to elucidate wetting stability.
authors.affiliation: Key Laboratory of Micro/Nano Systems for Aerospace, Ministry of Education and Shaan'xi Key Provincial Laboratory of Micro and Nano Electromechanical Systems, Northwestern Polytechnical University , Xi'an 710072, P. R. China.
authors.forename: Yang
authors.identifier: 0000-0003-4659-9349
authors.initials: Y
authors.lastname: He
authors.affiliation: Key Laboratory of Micro/Nano Systems for Aerospace, Ministry of Education and Shaan'xi Key Provincial Laboratory of Micro and Nano Electromechanical Systems, Northwestern Polytechnical University , Xi'an 710072, P. R. China.
authors.forename: Qingqing
authors.initials: Q
authors.lastname: Zhou
authors.affiliation: Key Laboratory of Micro/Nano Systems for Aerospace, Ministry of Education and Shaan'xi Key Provincial Laboratory of Micro and Nano Electromechanical Systems, Northwestern Polytechnical University , Xi'an 710072, P. R. China.
authors.forename: Shengkun
authors.initials: S
authors.lastname: Wang
authors.affiliation: Key Laboratory of Micro/Nano Systems for Aerospace, Ministry of Education and Shaan'xi Key Provincial Laboratory of Micro and Nano Electromechanical Systems, Northwestern Polytechnical University , Xi'an 710072, P. R. China.
authors.forename: Ruyuan
authors.initials: R
authors.lastname: Yang
authors.affiliation: Key Laboratory of Micro/Nano Systems for Aerospace, Ministry of Education and Shaan'xi Key Provincial Laboratory of Micro and Nano Electromechanical Systems, Northwestern Polytechnical University , Xi'an 710072, P. R. China.
authors.forename: Chengyu
authors.initials: C
authors.lastname: Jiang
authors.affiliation: Key Laboratory of Micro/Nano Systems for Aerospace, Ministry of Education and Shaan'xi Key Provincial Laboratory of Micro and Nano Electromechanical Systems, Northwestern Polytechnical University , Xi'an 710072, P. R. China.
authors.forename: Weizheng
authors.initials: W
authors.lastname: Yuan