Guo Xiaoyan, Liu Jiaqi, Liu Lixia, Yang Suohe, He Guangxiang, Jin Haibo
College of Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China.
Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology, Beijing 102617, China.
Materials (Basel). 2020 Apr 1;13(7):1615. doi: 10.3390/ma13071615.
TiO is a high-reflectance material for preparing sheets during dry reagent chemical tests in detail. In this study, bifunctional TiO sheets with diffusive and reflective properties were prepared using TiO microspheres (particle size 2-3 µm) and cellulose acetate (CA). Factors such as the CA dosage, water content, mixing time, and the choice of surfactant were investigated. The structure and properties of the bifunctional TiO sheets were characterized by thermogravimetry and differential thermal analysis (TG-DAT), scanning electron microscopy (SEM), dynamic contact angle test and reflectance spectroscopy. By studying the above experimental results, it was concluded that the most optimal preparation conditions for preparing the bi-functional TiO sheets under natural drying conditions were as follows: the mass ratio of CA to TiO microspheres was 0.05:1; Triton-100 was used to improve the diffusion performance of the bifunctional sheets, after mixing for 5 h and coating. The light reflectivity of the bifunctional TiO sheets in the 420 to 800 nm range was higher than 90%. Serum diffused in the bifunctional TiO sheets reacted in the reagent sheets and formed uniform colorful spots. Considering the repeatability of spot proportion and light reflectivity, the sheet offered a uniform serum diffusion and good repeatability. So, the bifunctional TiO sheets are nominated as a promising material for dry chemical diagnostic reagents.
TiO是一种用于干式试剂化学测试中详细制备试纸的高反射材料。在本研究中，使用TiO微球（粒径2 - 3 µm）和醋酸纤维素（CA）制备了具有扩散和反射特性的双功能TiO试纸。研究了CA用量、含水量、混合时间和表面活性剂选择等因素。通过热重分析和差示热分析（TG - DAT）、扫描电子显微镜（SEM）、动态接触角测试和反射光谱对双功能TiO试纸的结构和性能进行了表征。通过研究上述实验结果得出，在自然干燥条件下制备双功能TiO试纸的最优化制备条件如下：CA与TiO微球的质量比为0.05:1；使用Triton - 100改善双功能试纸的扩散性能，混合5小时后进行涂布。双功能TiO试纸在420至800 nm范围内的光反射率高于90%。在双功能TiO试纸中扩散的血清在试剂条中发生反应并形成均匀的彩色斑点。考虑到斑点比例和光反射率的重复性，该试纸具有均匀的血清扩散和良好的重复性。因此，双功能TiO试纸被认为是干式化学诊断试剂的一种有前景的材料。
