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000903843 1001_ $$00000-0001-6066-4616$$aSaini, Apurve$$b0
000903843 245__ $$aMagnetic Particle Self-Assembly at Functionalized Interfaces
000903843 260__ $$aWashington, DC$$bACS Publ.$$c2021
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000903843 520__ $$aWe 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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000903843 65027 $$0V:(DE-MLZ)SciArea-120$$2V:(DE-HGF)$$aCondensed Matter Physics$$x0
000903843 65017 $$0V:(DE-MLZ)GC-1604-2016$$2V:(DE-HGF)$$aMagnetic Materials$$x0
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000903843 7001_ $$00000-0002-9218-5588$$aTheis-Bröhl, Katharina$$b1
000903843 7001_ $$0P:(DE-Juel1)158075$$aKoutsioumpas, Alexandros$$b2
000903843 7001_ $$00000-0002-6393-3268$$aKrycka, Kathryn L.$$b3
000903843 7001_ $$0P:(DE-HGF)0$$aBorchers, Julie A.$$b4
000903843 7001_ $$0P:(DE-Juel1)188865$$aWolff, Max$$b5$$eCorresponding author$$ufzj
000903843 773__ $$0PERI:(DE-600)2005937-1$$a10.1021/acs.langmuir.0c03235$$gVol. 37, no. 14, p. 4064 - 4071$$n14$$p4064 - 4071$$tLangmuir$$v37$$x0743-7463$$y2021
000903843 8564_ $$uhttps://juser.fz-juelich.de/record/903843/files/Functional_Surfaces_March_8.pdf$$yOpenAccess
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