Rheology and microstructural studies of regenerated silk fibroin solutions

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• 作者：Anuya Nisal ; Chirag Kalelkar ; Jayesh Bellare ; Ashish Lele
• 关键词：Rheology ; Microrheology ; Silk ; Interfacial rheology
• 刊名：Rheologica Acta
• 出版年：2013
• 出版时间：November 2013
• 年：2013
• 卷：52
• 期：10-12
• 页码：833-840
• 全文大小：529KB
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• 作者单位：Anuya Nisal (1)
  Chirag Kalelkar (2)
  Jayesh Bellare (3)
  Ashish Lele (1)
  
  1. Complex Fluids and Polymer Engineering, Polymer Science and Engineering Division, National Chemical Laboratory, Pune, 411008, India
  2. Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur, 721302, India
  3. Department of Chemical Engineering, Indian Institute of Technology, Bombay, 400076, India
  
• ISSN：1435-1528

文摘

Regenerated silk fibroin solutions (RSF) are produced by dissolving degummed silk fibers in water. We have observed that RSF solutions at a concentration less than 15 % by weight exhibit an unusual gel-like response in conventional shear rheology measurements. At higher concentrations, the response is predominantly viscous (or liquid-like). We have probed this counterintuitive behavior of silk fibroin solutions by using microrheology, and interfacial rheometry. Scattering techniques were also used to understand the microstructure of RSF solutions as a function of the concentration. Our studies suggest that the gel-like response of the RSF solution may result from the formation of an interfacial film at the air–solution interface, which dominates the bulk rheological response.