Abstract
Small-angle neutron scattering (SANS) measurements are reported on a sterically stabilized, coreshell
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
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
Original language | English |
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Pages (from-to) | 10835-10845 |
Journal | Langmuir |
Volume | 21 |
Issue number | 23 |
DOIs | |
Publication status | Published - 2005 |
Externally published | Yes |
Subject classification (UKÄ)
- Physical Chemistry
Free keywords
- Small-angle neutron scattering
- core-shell particles
- contrast-variation
- PEG layer
- grafted