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Attractive double-l...
Attractive double-layer forces and charge regulation upon interaction between electrografted amine layers and silica
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- Duner, Gunnar (författare)
- KTH,Yt- och korrosionsvetenskap,KTH Royal Institute of Technology, Sweden
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- Iruthayaraj, Joseph (författare)
- Aarhus University, Denmark
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- Daasbjerg, Kim (författare)
- Aarhus University, Denmark
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- Pedersen, Steen Uttrup (författare)
- Aarhus University, Denmark
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- Thormann, Esben (författare)
- KTH,Yt- och korrosionsvetenskap,KTH Royal Institute of Technology, Sweden
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- Dédinaité, Andra (författare)
- KTH,RISE,YKI – Ytkemiska institutet,KTH Royal Institute of Technology, Sweden,Yt- och korrosionsvetenskap
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(creator_code:org_t)
- Elsevier BV, 2012
- 2012
- Engelska.
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Ingår i: Journal of Colloid and Interface Science. - : Elsevier BV. - 0021-9797 .- 1095-7103. ; 385:1, s. 225-234
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- Amine functionalities have been introduced on glassy carbon surfaces through electrografting of 4-(2-aminoethyl)benzenediazonium tetrafluoroborate. The grafted layers were characterized by ellipsometry and by nanomechanical mapping in air and aqueous solutions using the atomic force microscopy PeakForce QNM mode. The layer was found to be 2.5. nm thick with low roughness, comparable to that of the glassy carbon substrate. However, small semi-spherical features were observed in the topographical image, indicating a clustering of the grafted amine compound. The nanomechanical mapping also demonstrated some swelling of the layer in water and pointed toward an important contribution of electrostatic interactions for the tip-surface adhesion. The forces between an aminated glassy carbon surface and a μm-sized silica particle in aqueous solutions were measured at different ionic strength and pH-values. The results demonstrate that an attractive double-layer force predominates at large separations, and that the surface charge densities increase as the separation between the surfaces decreases. The degree of charge regulation on the aminated glassy carbon is significant. The relatively low surface charge density of the aminated glassy carbon is attributed to significant incorporation of counterions in the water-rich grafted layer.
Ämnesord
- NATURVETENSKAP -- Kemi -- Annan kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Other Chemistry Topics (hsv//eng)
Nyckelord
- AFM
- Double-layer force
- Electrografting
- Phenylethylamine
- Surface charge
- Surface potential
- Amine compounds
- Amine functionality
- Benzenediazonium tetrafluoroborate
- Carbon substrates
- Charge regulation
- Counterions
- Double layer force
- Glassy carbon surfaces
- Grafted layers
- Nanomechanical mappings
- pH value
- Phenylethylamines
- Silica particles
- Topographical images
- Atomic force microscopy
- Grafting (chemical)
- Ionic strength
- Organic compounds
- Separation
- Silica
- Solutions
- Glassy carbon
- 4 (aminoethyl)benzenediazonium tetrafluoroborate
- amine
- carbon
- imidazole derivative
- silicon dioxide
- unclassified drug
- water
- adhesion
- aqueous solution
- article
- chemical bond
- chemical structure
- dielectric constant
- electrochemical analysis
- electrode
- electron transport
- ellipsometry
- force
- molecular mechanics
- pH
- priority journal
- static electricity
- thickness
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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