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001     903843
005     20220103172043.0
024 7 _ |a 10.1021/acs.langmuir.0c03235
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100 1 _ |a Saini, Apurve
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245 _ _ |a Magnetic Particle Self-Assembly at Functionalized Interfaces
260 _ _ |a Washington, DC
|c 2021
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520 _ _ |a We study the assembly of magnetite nanoparticles in water-based ferrofluids in wetting layers close to silicon substrates with different functionalization without and with an out-of-plane magnetic field. For particles of nominal sizes 5, 15, and 25 nm, we extract density profiles from neutron reflectivity measurements. We show that self-assembly is only promoted by a magnetic field if a seed layer is formed at the silicon substrate. Such a layer can be formed by chemisorption of activated N-hydroxysuccinimide ester-coated nanoparticles at a (3-aminopropyl)triethoxysilane functionalized surface. Less dense packing is reported for physisorption of the same particles at a piranha-treated (strongly hydrophilic) silicon wafer, and no wetting layer is found for a self-assembled monolayer of octadecyltrichlorosilane (strongly hydrophobic) at the interface. We show that once the seed layer is formed and under an out-of-plane magnetic field further wetting layers assemble. These layers become denser with time, larger magnetic fields, higher particle concentrations, and larger moment of the nanoparticles.
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650 2 7 |a Condensed Matter Physics
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650 1 7 |a Magnetic Materials
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693 _ _ |a Forschungs-Neutronenquelle Heinz Maier-Leibnitz
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700 1 _ |a Theis-Bröhl, Katharina
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700 1 _ |a Koutsioumpas, Alexandros
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700 1 _ |a Krycka, Kathryn L.
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700 1 _ |a Borchers, Julie A.
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700 1 _ |a Wolff, Max
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773 _ _ |a 10.1021/acs.langmuir.0c03235
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856 4 _ |y OpenAccess
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856 4 _ |y OpenAccess
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