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  • Title: Small-angle neutron scattering on a core-shell colloidal system: a contrast-variation study.
    Author: Zackrisson M, Stradner A, Schurtenberger P, Bergenholtz J.
    Journal: Langmuir; 2005 Nov 08; 21(23):10835-45. PubMed ID: 16262360.
    Abstract:
    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.
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