fig2

Figure 2. SEM photos of isotropic microstructure surface and contact angle photos of water droplets. (A) Biomimetic nanocolumn array prepared by template method. Copyright 2020, ACS^[52]; (B) Microciliary array prepared by self-assembly method under magnetic field. Copyright 2020, Wiley^[53]; (C) 3D printing technology based on two-photon polymerization to manufacture reentrant structures. Copyright 2018, Wiley^[28]; (D) Multi-structure composite surface prepared by etching and electrospinning. Copyright 2020, Springer Nature^[55]; (E) Top-bound Self-branched (TCSB) Bionic superhydrophobic four-branched microstructures. Copyright 2022, ACS^[56]; (F) Superhydrophobic egg beater microstructure prepared by Immersed Surface Accumulation 3D printing process. Copyright 2010, Wiley^[57]. 3D: three-dimensional.