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  Interfacial adsorption, viscoelasticity and recovery of silk fibroin layers at different oil/water interface

Qiao, X., Miller, R., & Sun, K. (2017). Interfacial adsorption, viscoelasticity and recovery of silk fibroin layers at different oil/water interface. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 519, 179-186. doi:10.1016/j.colsurfa.2016.09.044.

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Qiao, Xiuying, Author
Miller, Reinhard1, Author           
Sun, Kang, Author
Affiliations:
1Reinhard Miller, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863501              

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Free keywords: Silk fibroin; Interfacial rheology; Adsorption; Viscoelasticity
 Abstract: Silk fibroin is verified as a good stabilizer for some oil-in-water emulsions, but the interfacial adsorption, viscoelasticity and stabilization mechanisms of silk fibroin at different oil/water interfaces were less reported. In this study, effect of silk fibroin concentration on the interfacial adsorption and viscoelasticity of silk fibroin at both dodecane/water and butyl butyrate/water interfaces were investigated. Higher protein concentration helps silk fibroin molecules to form well-organized network structures at the interface, with higher interfacial elasticity, quicker establishment of interfacial adsorption equilibrium and slower structure breakage at large strain. The nonpolar dodecane oil encourages microstructural rearrangements of the more hydrophobic silk fibroin and enhances the physical crosslinks within the interfacial networks, thus resulting in stronger interfacial elasticity, slower interfacial adsorption equilibrium and higher protein saturation concentration for the dodecane/water interface. The influence of silk fibroin concentration on the strain induced interfacial structure fracture also seems to be much stronger for the dodecane/water interface. However, after a nonlinear strain deformation, the fractured silk fibroin layers can merely recover partially for the dodecane/water interface except for very dilute silk fibroin systems, but can recover completely with more compact and elastic interfacial networks for the butyl butyrate/water interface.

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 Dates: 2016-09-132017
 Publication Status: Issued
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 Identifiers: DOI: 10.1016/j.colsurfa.2016.09.044
BibTex Citekey: Qiao2016
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Title: Colloids and Surfaces A: Physicochemical and Engineering Aspects
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 519 Sequence Number: - Start / End Page: 179 - 186 Identifier: ISSN: 0927-7757