UV Induced Superhydrophilicity of RSF Film
Received date: 2013-09-09
Online published: 2013-11-14
Supported by
Project supported by the National Natural Science Foundation of China (No. 21034003) and the Program of Shanghai Subject Chief Scientist (No. 12XD1401000).
The research has indicated that the surface wettability of biological material has important effects on the cell attachment. The water insoluble regenerated silk fibroin film, which was made through solution-casting and then treated using ethanol was treated by UV light in order to change its surface properties. The effects of the UV irradiation on the surface wettability of RSF film were investigated. The results showed that UV irradiation induced the superhydrophilic of the surface of RSF film from non-hydrophilic, as the water contact angle of the RSF film was changed from 89°to less than 10°. However, such superhydrophilicity is time-dependent in a certain degree, because the water contact angle of the irradiated RSF film was increased to around 25° during storage of the film. XPS indicated that the increase of the hydrophilic group on surface from 24.1% to 40.5% is the major reason. Furthermore, the tensile testing demonstrated that UV irradiation has little effect on the mechanical properties of bulk RSF based materials. In general, the UV irradiated RSF film with hydrophilic surface and significant mechanical properties may be a promising natural material which has widely potential application in the biomedical field.
Yin Jianwei , Duan Yu , Shao Zhengzhong . UV Induced Superhydrophilicity of RSF Film[J]. Acta Chimica Sinica, 2014 , 72(1) : 51 -55 . DOI: 10.6023/A13090943
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