钛酸钡/醋酸纤维素双功能膜的制备及应用

Preparation and Application of bi-functional BaTiO3/CA films

摘要:

以粒径500 nm的BaTiO3微球为原料，醋酸纤维素（CA）为粘合剂，制备了具有反射及扩散功能的BaTiO3/CA双功能膜，并利用SEM、接触角测试仪、紫外-可见分光光度计对BaTiO3/CA双功能膜进行了表征。考察了BaTiO3形貌、m(CA): m(BaTiO3)、搅拌时间、表面活性剂种类及用量、固含量、湿膜厚度等对双功能膜形貌、扩散性能及光反射率的影响。制备BaTiO3/CA双功能膜的最佳条件为：BaTiO3采用微球， m(CA): m(BaTiO3)=0.05，搅拌时间不少于4 h，表面活性剂为Triton X-100，添加量为20 μL/ 10 g (Triton X-100/ BaTiO3)，固含量44.9%，湿膜厚度0.4 mm。此条件下制备的双功能膜平整、光滑，热稳定性良好。血清经双功能膜扩散至自制试剂层后，反应形成的斑点颜色均一，5个平行样品反应斑点直径的标准偏差SD为0.055，说明扩散均匀且重复性好。此BaTiO3/CA双功能膜在460~800 nm波长内的光反射率大于97.5%。以此膜制备的葡萄糖（GLU）、尿酸（URIC）试剂的线性范围较利用TiO2/CA双功能膜制备的更广，试剂更为便捷。

Abstract:

Bi-functional BaTiO3/CA films were prepared with 500 nm BaTiO3 microspheres and cellulose acetate. SEM, contact angle meter, and UV-visible spectrophotometer were used to characterize them. The effect of BaTiO3 morphology, mass ratio of CA to BaTiO3, mixing time, different surfactants and dosages, solid content and films thickness on morphology, diffusion performance and light reflectivity of bi-functional films were studied. The optimal condition for preparing the bi-functional film were as follows: BaTiO3 was 500 nm microspheres. Mass ratio of CA to BaTiO3 was 0.05. Mixing time was more than 4 h. Surfactants was Triton X-100 which dosages was 20 μL/ 10 g (Triton X-100/ BaTiO3). Solid content was 44.9% and film thickness was 0.4 mm. Bi-functional films prepared in the condition were smooth and thermal stable. The light reflectivity of the bi-functional BaTiO3 film in the 460~800 nm range was higher than 97.5%. Serum diffused in the bi-functional BaTiO3 film reacted in the reagent film and then formed uniform colorful spots. The SD of the diameter of the five parallel samples was 0.055, which showed a good repeatability. The linear range of GLU and URIC reagents prepared with BaTiO3/CA bi-functional films was wider than that prepared with TiO2/CA films.