纳米TiO_2/丝素复合膜的制备及其机械性能研究

Study on preparation and mechanical intensity of nano TiO_2/Silk fibroin composite membrane

为获得良好强度的纳米TiO2/丝素复合膜,在丝素蛋白溶液中添加了纳米TiO2,采用复合法,通过控制配比,pH等条件制备了不同形态的复合膜,并以普通丝素膜作对照,用AFM,EDS和IR对复合膜进行了表征,在此基础上,研究了复合膜的机械性能.实验结果表明,复合膜制备方法合理,当W(TiO2)=1/1000时,纳米TiO2以粒径50nm左右均匀分散于复合膜中,纳米TiO2的加入,促进了丝素无规卷曲构象向β-折叠构象的转化,使复合膜表现出较丝素膜更优异的机械强度.

In order to make silk fibroin membrane with excellent mechanical intensity, several nano TiO2/silk fibroin composite membranes were prepared by controlling conditions, such as temperature, pH value. After being prepared, nano TiO2/silk fibroin composite membrane was characterized by AFM, EDS and FTIR and compared with pure silk fibroin membrane, and then the mechanical intensity of the composite membrane was studied. The experiments showed that, the method of preparation was reasonable;when the content of nanoTiO2 is 1/1000,compared to the weight of silk fibroin, it could homodisperse in the nano TiO2/silk fibroin composite membrane with the size about 50nm. It can be concluded that adding nanoTiO2 can cause silk fibroin molecule transforming from random coil conformation to β - sheet conformation, and so the composite membrane exhibits more excellent mechanical intensity.