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  Influence of pH on the surface and foaming properties of aqueous silk fibroin solutions

Qiao, X., Miller, R., Schneck, E., & Sun, K. (2020). Influence of pH on the surface and foaming properties of aqueous silk fibroin solutions. Soft Matter, 16(15), 3695-3704. doi:10.1039/C9SM02372K.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-F483-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-41B3-6
Genre: Journal Article

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 Creators:
Qiao, Xiuying, Author
Miller, Reinhard1, Author              
Schneck, Emanuel2, Author              
Sun, Kang, Author
Affiliations:
1Reinhard Miller, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863501              
2Emanuel Schneck, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_2074300              

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Free keywords: silk fibroin; surface layer formation; foam stabilization; interfacial rheology; pH effect
 Abstract: Silk fibroin (SF) adsorbs at the air/water interface, reduces the surface tension, and forms interfacial layers suppressing bubble coalescence and stabilizing foam. Variation of pH alters the inter-molecular interactions of SF in the interfacial layers and thus interfacial network formation, dilational visco-elasticity and foaming properties. At pH 4, around the isoelectric point, the reduced electrostatic repulsion between the SF molecules results in thicker adsorbed layers, but adsorption rate, foaming rate and foam stability are lower than at pH 3 and pH 7. At the highest pH investigated (pH 7), the small aggregate size and high protein flexibility lead to the formation of more ordered and stable viscoelastic interfacial networks, which are resistant to deformation breakage and generate homogeneous, denser and more stable foams.

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Language(s): eng - English
 Dates: 2020-03-232020
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1039/C9SM02372K
Other: FD nicht am Institut
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Title: Soft Matter
  Abbreviation : Soft Matter
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 16 (15) Sequence Number: - Start / End Page: 3695 - 3704 Identifier: ISSN: 1744-683X