阳极氧化工艺及改性对TiO_(2)纳米管阵列薄膜疏水性的影响

Effect of Anodizing Process and Modification on Hydrophobicity of TiO_(2) Nanotube Array Film

采用阳极氧化法在钛片表面制备TiO_(2)纳米管阵列薄膜,研究了不同氧化电压(15~25V)和时间(0.5~2h)下薄膜的微观结构;采用硬脂酸对其进行改性,分析了薄膜改性前后的润湿性能。结果表明:TiO_(2)纳米管平均管径和管间距随氧化电压增大而增大,随氧化时间的变化不明显,而表面结构均匀性则受氧化时间影响,氧化2h的结构均匀性较好;改性前薄膜表面呈亲水性,改性后呈疏水性,且改性前越亲水则改性后越疏水;氧化时间对改性薄膜水接触角的影响较大,不同电压下阳极氧化2h制备得到薄膜改性后均呈超疏水性,20V/2h下制备得到薄膜改性后的平均水接触角最大,可达159.7°。

The TiO_(2)nanotube array film was prepared on the titanium sheet surface by anodizing method,and the microstructure of the film prepared at different anodizing voltages(15-25 V)and times(0.5-2 h)was studied.Then the film was modified by stearic acid.The wetting performance of the film before and after modification was analyzed.The results show that the average diameter and tube spacing of TiO_(2)nanotube increased with increasing anodizing voltage,but did not changed obviously with the anodizing time.The surface structure uniformity was affected by the anodizing time,and the structure uniformity after anodizing for 2 h was realtively good.The surface of the film before modification was hydrophilic,and after modification was hydrophobic.The more hydrophilic the film before modification,the more hydrophobic after modification.The anodizing time had a greater effect on the water contact angle of the modified film.The films prepared by anodizing at different voltages for 2 h were all superhydrophobic after modification.The average water contact angle of the modified film prepared at 20 V/2 h was the highest,and the value was 159.7°.