Small-angle neutron scattering on a core-shell colloidal system: a contrast-variation study
- Zackrisson, M. Department of Chemistry, Göteborg University, Sweden
- Stradner, Anna Department of Physics, University of Fribourg, Switzerland
- Schurtenberger, Peter Department of Physics, University of Fribourg, Switzerland
- Bergenholtz, Johan Department of Chemistry, Göteborg University, Sweden
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08.10.2005
Published in:
- Langmuir. - 2005, vol. 21(23), p. 10835
English
Small-angle neutron scattering (SANS) measurements are reported on a sterically stabilized, core-shell colloidal system using contrast variation. Aqueous dispersions of polystyrene particles bearing grafted poly(ethylene glycol) (PEG) have been studied over a large range of particle concentrations and two different solvent conditions for the PEG polymer. SANS data are analyzed quantitatively by modeling the particles as core-shell colloids. In a good solvent and under particle contrast conditions, an effective hard-sphere interaction captures excluded-volume interactions up to high concentrations. Contrast variation, through isotopic substitution of both the core and solvent, expedite a detailed study of the PEG layer, both in the dilute limit and as a function of the particle concentration. Upon diminishing the solvent quality, subtle changes in the PEG layer translate into attractions among particles of moderate magnitude.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Physique
- Language
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- English
- Classification
- Physics
- License
- License undefined
- Identifiers
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- RERO DOC 5482
- DOI 10.1021/la051664v
- Persistent URL
- https://folia.unifr.ch/unifr/documents/300058
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