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dc.contributor.author
Sun, Qiyao
dc.contributor.author
Bertsch, Pascal
dc.contributor.author
Fischer, Peter
dc.date.accessioned
2021-05-07T11:38:07Z
dc.date.available
2021-01-25T12:53:24Z
dc.date.available
2021-05-04T07:57:10Z
dc.date.available
2021-05-07T11:38:07Z
dc.date.issued
2020-12-16
dc.identifier.uri
http://hdl.handle.net/20.500.11850/465341
dc.description.abstract
Cellulose Nanocrystals (CNC) are renewable, anisotropic nanoparticles gained from wood pulp. CNC allows for Pickering stabilization of fluid interfaces, as well as resulting foams and emulsions. Despite successful application, the underlying mechanisms of CNC adsorption and stabilization are matter of current debate. We present our recent advances on the adsorption and rheology of CNC at air/water and oil/water interfaces. CNC adsorption occurs at the time-scale of hours and induces a decrease in surface tension. Herein, we present parameters for the adsorption of CNC at the A/W interface. Initial CNC adsorption is limited by diffusion, followed by monolayer saturation and decrease in surface tension, indicating a Pickering stabilization. The adsorption of CNC may be accelerated by salt-induced charge screening. Neutron reflectometry revealed that CNC form a discontinuous monolayer with crystallites oriented in the interfacial plane. Besides numerous reports on CNC Pickering emulsions, the adsorption and stabilization of O/W interfaces by CNC remains mostly unknown. We investigated the adsorption of CNC at oils with varying polarity and chemical structure. CNC adsorption was found to be independent of the chain length of aliphatic n-alkanes, but strongly dependent on oil polarity. Surface pressures decreased for more polar oils due to lower particle adsorption energies. No surface pressure was measurable and the O/W emulsification capacity ceased for the most polar octanol, suggesting limited CNC adsorption. Further, salt-induced charge screening enhanced CNC adsorption and surface coverage due to lower interparticle and particle-interface electrostatic repulsion. An empiric power law is presented which predicts the induced surface pressure of charged nanoparticles based on the specific oil-water interface tension. These findings underline the prediction of nanoparticle-oil interactions and choice of the right oil-particle combination for application targeted properties.
en_US
dc.language.iso
en
en_US
dc.publisher
ICR
en_US
dc.title
Adsorption of Charged anisotropic nanoparticles at A/W and O/W Interface
en_US
dc.type
Other Conference Item
ethz.book.title
Abstract Book of the 18th International Congress on Rheology (ICR 2020)
en_US
ethz.pages.start
110
en_US
ethz.pages.end
110
en_US
ethz.event
18th International Congress on Rheology (ICR 2020)
en_US
ethz.event.location
Rio de Janeiro, Brazil
en_US
ethz.event.date
December 14-18, 2020
en_US
ethz.notes
Conference lecture on 16 December 2020
en_US
ethz.publication.place
s.l.
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02070 - Dep. Gesundheitswiss. und Technologie / Dep. of Health Sciences and Technology::02701 - Inst.f. Lebensmittelwiss.,Ernährung,Ges. / Institute of Food, Nutrition, and Health::03858 - Nyström, Laura M. / Nyström, Laura M.::08821 - Fischer, Peter (Tit.-Prof.)
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02070 - Dep. Gesundheitswiss. und Technologie / Dep. of Health Sciences and Technology::02701 - Inst.f. Lebensmittelwiss.,Ernährung,Ges. / Institute of Food, Nutrition, and Health::03858 - Nyström, Laura M. / Nyström, Laura M.::08821 - Fischer, Peter (Tit.-Prof.)
en_US
ethz.date.deposited
2021-01-25T12:53:31Z
ethz.source
FORM
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2021-05-07T11:38:17Z
ethz.rosetta.lastUpdated
2022-03-29T07:09:25Z
ethz.rosetta.versionExported
true
ethz.COinS
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