Journal
JOURNAL OF APPLIED CRYSTALLOGRAPHY
Volume 43, Issue -, Pages 959-969Publisher
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S0021889810025379
Keywords
small-angle neutron scattering; contrast variation; magnetic fluids; ferrofluids; cluster formation; sodium oleate; polyethylene glycol
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Funding
- Helmholtz-RFBR [HRJRG-016]
- Slovak Academy of Sciences [VEGA 0077, APVV-0509-07, APVV-99-02605]
- European Regional Development Fund [26220120021, 262022005]
- European Commission [RII3-CT-2003-505925]
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Contrast variation in small-angle neutron scattering (SANS) experiments is used to compare the structures of a water-based ferrofluid, where magnetite nanoparticles are stabilized by sodium oleate, and its mixture with biocompatible polyethylene glycol, PEG. The basic functions approach is applied, which takes into account the effects of polydispersity and magnetic scattering. Different types of stable aggregates of colloidal particles are revealed in both fluids. The addition of PEG results in a reorganization of the structure of the aggregates: the initial comparatively small and compact aggregates (about 40 nm in size) are replaced by large (more than 120 nm in size) fractal-type structures. It is postulated that these large structures are composed of single magnetite particles coated with PEG, which replaces sodium oleate. Micelle formation involving free sodium oleate is observed in both fluids. The structures of the fluids remain unchanged with increasing temperature up to 343 K. New and specific possibilities of SANS contrast variation with respect to multicomponent systems with different aggregates are considered.
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