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  Specific Effects of Ca2+ Ions and Molecular Structures of β-Lactoglobulin Interfacial Layers that Drive Macroscopic Foam Stability

Braunschweig, B., Schulze-Zachau, F., Nagel, E., Engelhardt, K., Stoyanov, S., Gochev, G., et al. (2016). Specific Effects of Ca2+ Ions and Molecular Structures of β-Lactoglobulin Interfacial Layers that Drive Macroscopic Foam Stability. Soft Matter, 12(27), 5995-6004. doi:10.1039/C6SM00636A.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-E95F-5 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-BE43-6
Genre: Journal Article

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 Creators:
Braunschweig, Björn, Author
Schulze-Zachau, Felix, Author
Nagel, Eva, Author
Engelhardt, Kathrin, Author
Stoyanov, Stefan, Author
Gochev, Georgi1, Author              
Khristov, Khr., Author
Mileva, Elena, Author
Exerowa, Dotchi, Author
Miller, Reinhard1, Author              
Peukert, Wolfgang, Author
Affiliations:
1Reinhard Miller, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863501              

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Free keywords: Open Access
 Abstract: β-lactoglobulin (BLG) adsorption layers at air-water interfaces were studied in situ with vibrational sum-frequency generation (SFG), tensiometry, surface dilatational rheology and ellipsometry as a function of bulk Ca2+ concentration. The relation between the interfacial molecular structure of adsorbed BLG and the interactions with the supporting electrolyte is additionally addressed on higher length scales along the foam hierarchy – from the ubiquitous air-water interface through thin foam films to macroscopic foam. For concentrations <1 mM, a strong decrease in SFG intensity from O-H stretching bands and a slight increase in layer thickness and surface pressure are observed. A further increase in Ca2+ concentrations above 1 mM causes an apparent change in the polarity of aromatic C-H stretching vibrations from interfacial BLG which we associate to a charge reversal at the interface. Foam film measurements show formation of common black films at Ca2+ concentrations above 1 mM due to considerable decrease of the stabilizing electrostatic disjoining pressure. These observations also correlate with a minimum in macroscopic foam stability. For concentrations >30 mM Ca2+, micrographs of foam films show clear signatures of aggregates which tend to increase the stability of foam films. Here, the interfacial layers have a higher surface dilatational elasticity. In fact, macroscopic foams formed from BLG dilutions with high Ca2+ concentrations where aggregates and interfacial layers with higher elasticity are found, showed the highest stability with much smaller bubble sizes.

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 Dates: 2016-06-132016-07-21
 Publication Status: Published in print
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 Identifiers: DOI: 10.1039/C6SM00636A
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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: 12 (27) Sequence Number: - Start / End Page: 5995 - 6004 Identifier: ISSN: 1744-683X
CoNE: https://pure.mpg.de/cone/journals/resource/1744-683X