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dc.contributor.author
Alison, Lauriane
dc.contributor.author
Demirörs, Ahmet F.
dc.contributor.author
Tervoort, Elena
dc.contributor.author
Teleki, Alexandra
dc.contributor.author
Vermant, Jan
dc.contributor.author
Studart, André R.
dc.date.accessioned
2020-12-15T08:31:07Z
dc.date.available
2018-06-08T06:55:56Z
dc.date.available
2018-06-19T09:08:39Z
dc.date.available
2020-12-08T10:39:05Z
dc.date.available
2020-12-15T08:31:07Z
dc.date.issued
2018-05
dc.identifier.issn
0743-7463
dc.identifier.issn
1520-5827
dc.identifier.other
10.1021/acs.langmuir.8b00622
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/268419
dc.description.abstract
In food-grade emulsions, particles with an appropriate surface modification can be used to replace surfactants and potentially enhance the stability of emulsions. During the life cycle of products based on such emulsions, they can be exposed to a broad range of pH conditions and hence it is crucial to understand how pH changes affect stability of emulsions stabilized by particles. Here, we report on a comprehensive study of the stability, microstructure, and macroscopic behavior of pH-controlled oil-in-water emulsions containing silica nanoparticles modified with chitosan, a food-grade polycation. We found that the modified colloidal particles used as stabilizers behave differently depending on the pH, resulting in unique emulsion structures at multiple length scales. Our findings are rationalized in terms of the different emulsion stabilization mechanisms involved, which are determined by the pH-dependent charges and interactions between the colloidal building blocks of the system. At pH 4, the silica particles are partially hydrophobized through chitosan modification, favoring their adsorption at the oil–water interface and the formation of Pickering emulsions. At pH 5.5, the particles become attractive and the emulsion is stabilized by a network of agglomerated particles formed between the droplets. Finally, chitosan aggregates form at pH 9 and these act as the emulsion stabilizers under alkaline conditions. These insights have important implications for the processing and use of particle-stabilized emulsions. On one hand, changes in pH can lead to undesired macroscopic phase separation or coalescence of oil droplets. On the other hand, the pH effect on emulsion behavior can be harnessed in industrial processing, either to tune their flow response by altering the pH between processing stages or to produce pH-responsive emulsions that enhance the functionality of the emulsified end products.
en_US
dc.language.iso
en
en_US
dc.publisher
American Chemical Society
en_US
dc.title
Emulsions Stabilized by Chitosan-Modified Silica Nanoparticles: PH Control of Structure-Property Relations
en_US
dc.type
Journal Article
dc.date.published
2018-05-02
ethz.journal.title
Langmuir
ethz.journal.volume
34
en_US
ethz.journal.issue
21
en_US
ethz.journal.abbreviated
Langmuir
ethz.pages.start
6147
en_US
ethz.pages.end
6160
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Washington, DC
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02160 - Dep. Materialwissenschaft / Dep. of Materials::03831 - Studart, André R. / Studart, André R.
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02160 - Dep. Materialwissenschaft / Dep. of Materials::02646 - Institut für Polymere / Institute of Polymers::09482 - Vermant, Jan / Vermant, Jan
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02160 - Dep. Materialwissenschaft / Dep. of Materials::03831 - Studart, André R. / Studart, André R.
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02160 - Dep. Materialwissenschaft / Dep. of Materials::02646 - Institut für Polymere / Institute of Polymers::09482 - Vermant, Jan / Vermant, Jan
ethz.date.deposited
2018-06-08T06:55:57Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2018-06-19T09:08:41Z
ethz.rosetta.lastUpdated
2021-02-15T22:31:45Z
ethz.rosetta.versionExported
true
ethz.COinS
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