Stable Superwetting Surface Prepared with Tilted Silicon Nanowires

Large-scale uniform nanostructured surface with superwettability is crucial in both fundamental research and engineering applications.A facile and controllable approach was employed to fabricate a superwetting tilted silicon nanowires(TSNWs) surface through metal-assisted chemical etching and modification with low-surface-energy material.The contact angle(CA) measurements of the nanostructured surface show a large range from the superhydrophilicity(the CA approximate to 0°) to superhydrophobicity(the CA up to 160°).The surface becomes antiadhesion to water upon nanostructuring with a measured sliding angle(a) close to 0°.Moreover,the fluorinated TSNWs surface exhibits excellent stability and durability because strong chemical bonding has been formed on the surface.

Al-Mg-Li三元合金表面张力的估算

运用表面张力计算公式Butler方程,与过剩吉布斯自由能结合,计算了973 K温度下Al-Mg, Al-Li和Mg-Li二元体系的表面张力。结果表明,在铝熔体中分别加入金属镁或锂,合金表面张力随其含量增加而降低;在镁熔体中加入金属锂,合金表面张力随锂含量增加而降低。以此为基础,利用Chou模型计算得Al-Mg-Li三元合金的表面张力为0.326~0.851 N/m,随铝或镁含量增加表面张力增大,随锂含量增加表面张力减小。