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Effect of Surface C...
Effect of Surface Charge Density on the Affinity of Oxide Nanoparticles for the Vapor–Water Interface
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Brown, Matthew (author)
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Duyckaerts, Nicolas (author)
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Redondo, Amaia Beloqui (author)
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Jordan, Inga (author)
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Nolting, Frithjof (author)
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Kleibert, Armin (author)
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Ammann, Markus (author)
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Wörner, Hans Jakob (author)
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Bokhoven, Jeroen A. van (author)
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- Abbas, Zareen, 1962 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology
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(creator_code:org_t)
- 2013-04-09
- 2013
- English.
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In: Langmuir. - : American Chemical Society (ACS). - 0743-7463 .- 1520-5827. ; 29:16, s. 5023-5029
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http://www.atto.ethz...
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https://gup.ub.gu.se...
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https://doi.org/10.1...
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Abstract
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- Using in-situ X-ray photoelectron spectroscopy at the vapor–water interface, the affinity of nanometer-sized silica colloids to adsorb at the interface is shown to depend on colloid surface charge density. In aqueous suspensions at pH 10 corrected Debye–Hückel theory for surface complexation calculations predict that smaller silica colloids have increased negative surface charge density that originates from enhanced screening of deprotonated silanol groups (≡Si–O–) by counterions in the condensed ion layer. The increased negative surface charge density results in an electrostatic repulsion from the vapor–water interface that is seen to a lesser extent for larger particles that have a reduced charge density in the XPS measurements. We compare the results and interpretation of the in-situ XPS and corrected Debye–Hückel theory for surface complexation calculations with traditional surface tension measurements. Our results show that controlling the surface charge density of colloid particles can regulate their adsorption to the interface between two dielectrics.
Subject headings
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Keyword
- Colloidal suspension
- XPS
- surface potential
- particle attachment
- size-dependent effect
- air/water interface
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Brown, Matthew
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Duyckaerts, Nico ...
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Redondo, Amaia B ...
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Jordan, Inga
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Nolting, Frithjo ...
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Kleibert, Armin
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Ammann, Markus
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Wörner, Hans Jak ...
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Bokhoven, Jeroen ...
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Abbas, Zareen, 1 ...
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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Langmuir
- By the university
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University of Gothenburg