Microscopic insights into hydrophobicity of cerium oxide:Effects of crystal orientation and lattice constant  

作　　者：Dapeng Zhu Weiwei Liu Rongzhi Zhao Zhen Shi Xiangyang Tan Zhenhua Zhang Yixing Li Lianze Ji Xuefeng Zhang 

机构地区：[1]Key Laboratory for Anisotropy and Texture of Materials(MOE),School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China [2]Institute of Advanced Magnetic Materials,College of Materials and Environmental Engineering,Hangzhou Dianzi University,Hangzhou 310012,China

出　　处：《Journal of Materials Science & Technology》2022年第14期20-29,共10页材料科学技术（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51901062 and U1908220);the Natural Science Foundation of Zhejiang Province(No.LR18E010001);the Key R&D Project of Zhejiang Province(Nos.2019C01121 and 2021C01023);the LiaoNing Revitalization Talents Program(No.XLYC1807177)。

摘　　要：Cerium oxide possesses intrinsic hydrophobic properties ascribed to the unique electronic structure.However,the relationship between the crystal structure and hydrophobicity of cerium oxide has not been systematically studied.Herein,it is experimentally and theoretically demonstrated that the water contact angle(105.9°)of the(111)surface is higher than that(91.7°)of the(220)surface,associated with the lower surface free energy(28.44 mN/m)of(111)surface than that(38.48 mN/m)of(220)surface.Furthermore,cerium oxide films with(111)-terminated surface are annealed at 300℃ and 600℃ for1 h,respectively.The lattice constant increases(5.4594Å<5.4613Å<5.4670Å)with decreasing the annealing temperature(600℃>300℃>the as-deposited),leading to the increased water contact angle(96.7°<96.8°<99.0°).The First-principles calculation provides microscopic insights into the wetting mechanism,originating from the weakened adsorption capacity of the(111)surface for water molecules with the increasing lattice constant.

关 键 词：Cerium oxide HYDROPHOBICITY Lattice constant Crystal orientation 

分 类 号：TQ133.3[化学工程—无机化工]