层间距离调控双层二维材料的可控梯度润湿性,ACS Applied Materials & Interfaces

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层间距离调控双层二维材料的可控梯度润湿性
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-08-24 , DOI: 10.1021/acsami.2c08282
Hongfei Ye ₁ , Chenguang Yin ₁ , Jian Wang ₁ , Yonggang Zheng ₁

Affiliation

具有可控和梯度润湿性的表面通常需要精心设计微结构或其在电、热、光学、pH 和其他刺激下的响应。通常，这些物理或化学作用下的润湿性变化依赖于难以定量描述的复杂机制。在这项研究中，基于双层石墨烯原子结构，提出了一种表面润湿性的在线控制策略和相应的理论模型。分子动力学结果表明，无论其润湿性如何，在粘贴底部材料后，表面润湿性都会向亲水性变化。但这种影响随着层间距离的增加而减弱，整体润湿性逐渐接近上层材料的润湿性。这种变化通过粘附功的增加来阐明，为石墨烯的润湿透明度提供了新的见解。基于粘附功建立了控制关系的理论模型，该模型将整体表面润湿性与层间距离和单个材料的润湿性相关联。此外，通过倾斜底部材料获得具有均匀润湿梯度的表面。这种梯度润湿性可以诱导液滴的自发和稳定运动。通过考虑不同层间距离的理论模型评估相关的加速行为，这揭示了下层的关键作用。本研究提出了一种使用主流二维材料可控润湿和相关梯度表面的新策略，

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Controllable and Gradient Wettability of Bilayer Two-Dimensional Materials Regulated by Interlayer Distance

Surfaces with controllable and gradient wettability often require an elaborate design of the microstructure or its response under electrical, thermal, optical, pH, and other stimuli. Generally, the wettability change under these physical or chemical effects relies on a complex mechanism that is difficult to be quantitatively described. In this study, an online controlling strategy for surface wettability and the corresponding theoretical model are put forward based on a bilayer graphene-like atomic structure. Molecular dynamics results indicate that the surface wettability varies toward hydrophilicity after sticking a bottom material regardless of its wettability. But such an influence becomes weak with increasing interlayer distance, and the overall wettability approaches that of the upper layer material gradually. This variation is elucidated by the increase of the work of adhesion, providing new insight into the wetting transparency of graphene. A theoretical model of the governing relationship is established based on the work of adhesion, which correlates the overall surface wettability with the interlayer distance and the wettabilities of individual materials. Moreover, a surface with a uniform wettability gradient is achieved by inclining the bottom material. The spontaneous and steady motion of droplets can be induced by this gradient wettability. The relevant speedup behavior is evaluated through a theoretical model considering the varying interlayer distance, which reveals the critical role of the lower layer. This study proposes a novel strategy for controllable wetting and relevant gradient surfaces using prevailing two-dimensional materials, paving new routes to many applications such as microfluidic chips, virus diagnosis, and intelligent sensors.

更新日期：2022-08-24

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