Palma Dener Pedro da Silva, Silva Giovana Pedroso, Zago Fernanda Mathidios, Codaro Eduardo Norberto, Acciari Heloisa Andréa
São Paulo State University (Unesp), School of Engineering and Sciences, Department of Chemistry and Energy, Guaratinguetá, SP, 12516-410, Brazil.
Heliyon. 2024 Mar 20;10(7):e28144. doi: 10.1016/j.heliyon.2024.e28144. eCollection 2024 Apr 15.
This paper explores the features of both nanoporous and compact TiO films formed by titanium anodisation in two experimental conditions, given that they have completely different morphologies and properties than those found by our previous studies. After anodisation, samples have been subjected for 20 days to immersion tests in different media (HO, HPO, and KOH). Surface morphology, phase composition and wettability of anodised films were investigated using FESEM, FTIR, Raman spectroscopy, contact angle measurements and XPS, and the hydrophilicity of modified surfaces was investigated by immersion tests. Nanoporous films exhibited hydrophobic surfaces, but contact angle values gradually decreased after immersing films in HO, HPO and KOH media, respectively. However, compact films produced superhydrophilic surfaces, both before and after immersion tests, with the exception of immersing the film in a HPO medium due to film removal by acid attack. As for compact films, an unusual morphology revealed by the presence of cone-shaped particles might be responsible for the adsorption of -OH groups arranged so as to favour anatase phase formation.
鉴于通过钛阳极氧化在两种实验条件下形成的纳米多孔TiO薄膜和致密TiO薄膜具有与我们先前研究中发现的完全不同的形态和性质，本文对它们的特性进行了探究。阳极氧化后，将样品在不同介质（HO、HPO和KOH）中进行了20天的浸泡测试。使用场发射扫描电子显微镜（FESEM）、傅里叶变换红外光谱（FTIR）、拉曼光谱、接触角测量和X射线光电子能谱（XPS）对阳极氧化薄膜的表面形态、相组成和润湿性进行了研究，并通过浸泡测试研究了改性表面的亲水性。纳米多孔薄膜呈现出疏水表面，但将薄膜分别浸入HO、HPO和KOH介质后，接触角值逐渐降低。然而，致密薄膜在浸泡测试前后均产生了超亲水表面，但将薄膜浸入HPO介质时除外，因为酸蚀会导致薄膜被去除。至于致密薄膜，由锥形颗粒的存在所揭示的异常形态可能是有利于锐钛矿相形成的-OH基团吸附的原因。
