We report an experimental study of the effect of visible and UV light irradiation on the wettability of films made by the assembly of SiO₂ and α − Fe₂O₃ particles in the nanometer range. To optimize the conditions for the film formation (adhesion of nanoparticles on glass substrates) using a dip-coating technique, we have analyzed the colloidal stability through Zeta-potential measurements of the nanoparticles by varying the pH of the solution. Additionally, X-ray diffraction (XRD), Raman, and Fourier transform infrared (FTIR) spectroscopy were used to study the structural and optical properties of the samples. The wettability behavior was performed by contact angle (CA) measurements using a sessile drop method. The atomic force microscope (AFM) results showed similar roughness parameters for both systems; however, we have obtained different wettability characteristics: superhydrophilic for SiO₂ and hydrophilic for α − Fe₂O₃. This difference is due to its physicochemical nature rather than the morphological structure of their surfaces, as predicted by the Wenzel equation. The CA of α − Fe₂O₃ surface changed upon irradiation by visible (2.7 eV) and UV (4.2 eV) light, i.e. from 38° (hydrophilic) to 15° (highly hydrophilic), respectively, while the SiO₂ case was kept constant (around 7°). These changes in CA can be attributed to the amount and mechanism of electron-hole pair photogenerated that breakdown organic molecules or dissociate water from moisture, lead to increasing hydroxyl species on the surface. The present study could provide new insights to control the wettability on hydrophilic surfaces with complex structures when it is irradiated with light at different wavelengths.

我们报告了对可见光和紫外线辐射对由SiO ₂和α-Fe ₂ O ₃组装而成的薄膜的润湿性的影响的实验研究。纳米范围内的颗粒。为了优化使用浸涂技术形成膜的条件（纳米颗粒在玻璃基板上的附着力），我们通过改变溶液的pH值通过纳米颗粒的Zeta电位测量分析了胶体稳定性。此外，还使用X射线衍射（XRD），拉曼光谱和傅立叶变换红外（FTIR）光谱研究了样品的结构和光学性质。通过使用无滴法通过接触角（CA）测量来进行润湿性行为。原子力显微镜（AFM）的结果表明，两个系统的粗糙度参数相似。然而，我们获得了不同的润湿性：SiO ₂为超亲水性而α-Fe ₂ O为亲水性₃。这种差异是由于其物理化学性质，而不是其表面​​的形态结构所致，正如Wenzel方程所预测的那样。α-Fe ₂ O ₃表面的CA在可见光（2.7 eV）和紫外线（4.2 eV）照射后发生变化，即分别从38°（亲水）到15°（高度亲水），而SiO ₂情况保持恒定（大约7°）。CA的这些变化可归因于光生电子空穴对的数量和机理，该光生空穴使有机分子分解或将水分与水分解离，从而导致表面上的羟基种类增加。本研究可以提供新的见解，以控制不同波长的光照射时，对具有复杂结构的亲水表面的润湿性。