Recently, reversible surface superwettability has attracted enormous interest, and methods to shorten the cycle time of transition have also garnered the attention of researchers. Herein, a superhydrophobic, open‐cell graphene network (OCGN) is fabricated via self‐assembly of graphene oxide and vapor ejection. Owing to the special open‐cell microstructure, the OCGNs can be transformed to be superhydrophilic rapidly within only 1 s by air plasma treatment. Moreover, the OCGNs with pure graphene composition have a high conductivity and show an ultrafast Joule heating rate of up to 20 °C s⁻¹ at a voltage of 20 V. By means of this property, for the first time an ultrafast recovery of the superhydrophobicity for OCGNs by self‐induced Joule heating with the shortest time of 1 min is reported. The mechanism of ultrafast, reversible transition is also explored specifically in this study. In addition, the superhydrophilic OCGNs show superoleophobicity in water and their underwater adhesion for oil droplets can be controlled by plasma treatment. Finally, the OCGNs with different oil adhesion properties are fabricated and the underwater oil microdroplet transportation is realized using OCGNs. Therefore, the OCGNs with smart surface can be an excellent candidate for achieving multifunctional superwettability of surfaces.

中文翻译：

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石墨烯网络超润湿性的超快速，可逆转变和可控的水下油附着力，可用于油微滴运输

最近，可逆的表面超湿性引起了极大的兴趣，并且缩短转变周期时间的方法也引起了研究人员的注意。在此，通过氧化石墨烯的自组装和蒸汽喷射制造了超疏水的开孔石墨烯网络（OCGN）。由于特殊的开孔微结构，通过空气等离子体处理，OCGNs可以在1 s内迅速转变为超亲水性。此外，具有纯石墨烯成分的OCGN具有高电导率，并且显示出高达20°C s ^-1的超快焦耳加热速率凭借此特性，首次报道了通过自感应焦耳加热以最短的1分钟时间超快速恢复OCGN的超疏水性的​​过程。在这项研究中还特别探讨了超快，可逆转变的机制。此外，超亲水性OCGNs在水中表现出超疏油性，其水下对油滴的附着力可通过等离子体处理来控制。最后，制备了具有不同油黏附特性的OCGNs，并利用OCGNs实现了水下油微滴运输。因此，具有智能表面的OCGN可以成为实现表面多功能超润湿性的极佳候选者。