Wang Yue, Guo Yufeng, Guo Wanlin
State Key Laboratory of Mechanics and Control of Mechanical Structures and MOE Key Laboratory for Intelligent Nano Materials and Devices, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China.
Phys Chem Chem Phys. 2020 Dec 16;22(47):27873-27881. doi: 10.1039/d0cp04656f.
Our extensive molecular dynamics simulations reveal a significant screening effect of monolayer graphene and hexagonal boron nitride (h-BN) on surface deicing of substrates with different degrees of hydrophilicity, including superhydrophilic (SHP) and superhydrophobic (SHB) substrates. Compared with bare surfaces, graphene and h-BN reduce the interfacial shear strength and the normal detaching strength of ice on an SHP substrate but increase the shear and detaching strengths on hydrophobic and SHB substrates. However, the shear and detaching strengths of ice become approximately unified on all of the surfaces, when interface ice layers melt into liquid water, demonstrating the screening capability from graphene and h-BN that weakens the influence of substrates on ice adhesion. Graphene and h-BN coatings suppress ice premelting on the SHP surface and change the dielectric constant of interface ice or water. This work could deepen our understanding of the role of van der Waals crystals in deicing coating.
我们广泛的分子动力学模拟揭示了单层石墨烯和六方氮化硼（h-BN）对不同亲水性底物（包括超亲水（SHP）和超疏水（SHB）底物）表面除冰的显著屏蔽效应。与裸露表面相比，石墨烯和h-BN降低了超亲水底物上冰的界面剪切强度和法向脱离强度，但增加了疏水和超疏水底物上的剪切和脱离强度。然而，当界面冰层融化成液态水时，冰在所有表面上的剪切和脱离强度变得大致统一，这表明石墨烯和h-BN的屏蔽能力减弱了底物对冰附着力的影响。石墨烯和h-BN涂层抑制了超亲水表面上的冰预融，并改变了界面冰或水的介电常数。这项工作可以加深我们对范德华晶体在除冰涂层中作用的理解。
