Change search
ReferencesLink to record
Permanent link

Direct link
Insight into the adsorption of humic acid/Gd(3+) complex on the surface of Al(2)O(3) studied in situ by QCM-D and ex situ by ellipsometry and XPS
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology.
2011 (English)In: Soft Matter, ISSN 1744-683X, Vol. 7, no 16, 7424-7430 p.Article in journal (Refereed) Published
Abstract [en]

The adsorption of humic acid (HA) on an Al(2)O(3) surface in the presence of Gd(3+) was studied in situ by quartz crystal microbalance with dissipation (QCM-D) and ex situ by ellipsometry and XPS. Adsorption of a HA/Gd(3+) complex yielded an adlayer of a mass of 354 ng cm(-2), the adlayer is characterized by a relatively high dissipation indicating a significant viscoelastic character. The viscoelasticity is enhanced by the salt and water molecules penetrating the adlayer causing it to stretch. The dry state average thickness of the adlayer is about 23 angstrom as measured by ellipsometry. Ellipsometry revealed a slower kinetics in the case of HA/Gd(3+) adsorption than that of HA alone. XPS spectra proves the adsorption and demonstrates quantitatively that the adsorption of HA/Gd(3+) and HA show the same trend, except for the higher adsorption in the case of HA/Gd(3+) compared with HA. The structure of the HA/Gd(3+) adlayer may be assumed according to the results of the three techniques to consist of a monolayer of HA bound directly to the surface of Al(2)O(3) and connected via a Gd(3+) bridge to a HA upper layer.

Place, publisher, year, edition, pages
2011. Vol. 7, no 16, 7424-7430 p.
National Category
Chemical Engineering
URN: urn:nbn:se:kth:diva-38970DOI: 10.1039/c1sm05806aISI: 000293412900039ScopusID: 2-s2.0-79961157149OAI: diva2:438755
Available from: 2011-09-05 Created: 2011-09-05 Last updated: 2011-09-05Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Eita, Mohamed
By organisation
Fibre Technology
In the same journal
Soft Matter
Chemical Engineering

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 18 hits
ReferencesLink to record
Permanent link

Direct link