Boonyarattanakalin Kanokthip, Rattan Praphaporn, Songpanit Maneerat, Chutipaijit Sutee, Okumura Hideyuki, Ishihara Keiichi N, Mekprasart Wanichaya, Pecharapa Wisanu
College of Materials Innovation and Technology, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand.
Graduate School of Energy Science, Kyoto University, Yoshida Honmachi, Sakyo, Kyoto 606-8501, Japan.
Polymers (Basel). 2024 May 14;16(10):1400. doi: 10.3390/polym16101400.
In this study, we investigated the impact of polyvinyl alcohol (PVA) incorporation on the optical properties and oxygen detection performance of a titanium dioxide/methylene blue (TiO/MB) nanocomposite colorimetric indicator for packaging applications. The nanocomposite was synthesized via mechanical milling of TiO nanoparticles with MB and citric acid. PVA, at varying concentrations (0, 3, 9, and 14 wt%), was introduced during the wet milling process to produce a homogeneous composite film. Spin coating was employed to fabricate TiO/MB nanocomposite films for oxygen detection evaluation. The influence of PVA loading on the films' chemical functionalities and surface morphologies was assessed using Fourier-transform infrared spectroscopy (FTIR) and field-emission scanning electron microscopy (FE-SEM). The indicator's activation process, involving a color change between bleached and colored states, and its recovery time were monitored via optical imaging and UV-VIS-NIR spectrophotometry. The results revealed that a PVA content of 9 wt% yielded well-defined films with enhanced stability of the TiO/MB nanocomposite's oxygen detection performance.
在本研究中，我们研究了掺入聚乙烯醇（PVA）对用于包装应用的二氧化钛/亚甲基蓝（TiO/MB）纳米复合比色指示剂的光学性质和氧气检测性能的影响。该纳米复合材料是通过将TiO纳米颗粒与MB和柠檬酸进行机械研磨合成的。在湿磨过程中引入不同浓度（0、3、9和14 wt%）的PVA，以制备均匀的复合薄膜。采用旋涂法制备用于氧气检测评估的TiO/MB纳米复合薄膜。使用傅里叶变换红外光谱（FTIR）和场发射扫描电子显微镜（FE-SEM）评估PVA负载量对薄膜化学功能和表面形态的影响。通过光学成像和紫外-可见-近红外分光光度法监测指示剂的活化过程，该过程涉及漂白态和着色态之间的颜色变化及其恢复时间。结果表明，9 wt%的PVA含量产生了具有明确特征的薄膜，提高了TiO/MB纳米复合材料氧气检测性能的稳定性。
