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Effect of pore morphology and surface roughness on wettability of porous titania films
Materials Research Express ( IF 2.3 ) Pub Date : 2020-12-03 , DOI: 10.1088/2053-1591/abc770
Bangyun Xiong 1 , Jingjing Li 1 , Chunqing He 2 , Xiuqin Tang 3 , Zizhao Lv 1 , Xiaofeng Li 1 , Xiqiang Yan 1
Affiliation  

Surface hydrophobicity/hydrophilicity of titania (TiO2) films, spin-coated on silicon wafers, were tuned by introducing surface mesopores with various morphologies using a triblock copolymer F38 as the template agent of different weight ratios via a sol-gel method. It is found that both the porosity (2.92∼33.03%) and the surface roughness (0.22∼0.43 nm for arithmetic mean roughness and 0.28∼0.58 nm for root mean square roughness) of the films increase monotonically as increasing F38 ratio from 5 to 25 wt%, accompanied by distinct changes of pore morphology from isolated mesopores with pore sizes of 5∼7 nm to longer worm-like pores (30∼100 nm in length). The apparent static contact angle (θ*) of the films with isolated mesopores is enhanced from ca. 90.6 to 100.1 as indicated by an increase of the roughness factor with incresing F38 from 5 to 15 wt%, which is in qualitative agreement with the Wenzel’s equation. Interestingly, the films with interconnected worm-like pores show obvious hydrophilicity (θ*=80.7) with further increasing F38 ratio higher than 20 wt%. The reversed surface wettability show that not only surface roughness but also pore morphology could significantly affect the wettability of the mesoporous TiO2 films.



中文翻译:

孔隙形态和表面粗糙度对多孔二氧化钛薄膜润湿性的影响

使用三嵌段共聚物F38作为不同重量比的模板剂,通过溶胶-凝胶法引入具有各种形态的表面介孔,从而调节旋涂在硅片上的二氧化钛(TiO 2)膜的表面疏水性/亲水性。发现随着F38比从5增加到25,膜的孔隙率(2.92%〜33.03%)和表面粗糙度(算术平均粗糙度为0.22〜0.43 nm,均方根粗糙度为0.28〜0.58 nm)都单调增加。重量%,伴随着孔形态的明显变化,从孤立的中孔(孔径为5〜7 nm)到更长的蠕虫状孔(长度为30〜100 nm)。视在静态接触角(θ*)具有分离的中孔的薄膜从大约 F6从5 wt%增加到15 wt%时,粗糙度系数增加,表明粗糙度系数从90.6提高到100.1,这与Wenzel方程在质量上是一致的。有趣的是,具有相互连接的蠕虫状孔的薄膜表现出明显的亲水性(θ * = 80.7),并且随着F38的比例进一步增加,高于20 wt%。反向的表面润湿性表明,不仅表面粗糙度,而且孔的形态也会显着影响中孔TiO 2膜的润湿性。

更新日期:2020-12-03
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