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@ARTICLE{Saini:903843,
      author       = {Saini, Apurve and Theis-Bröhl, Katharina and Koutsioumpas,
                      Alexandros and Krycka, Kathryn L. and Borchers, Julie A. and
                      Wolff, Max},
      title        = {{M}agnetic {P}article {S}elf-{A}ssembly at {F}unctionalized
                      {I}nterfaces},
      journal      = {Langmuir},
      volume       = {37},
      number       = {14},
      issn         = {0743-7463},
      address      = {Washington, DC},
      publisher    = {ACS Publ.},
      reportid     = {FZJ-2021-05476},
      pages        = {4064 - 4071},
      year         = {2021},
      abstract     = {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.},
      cin          = {JCNS-FRM-II / JCNS-2 / JCNS-4 / MLZ},
      ddc          = {540},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)JCNS-4-20201012 /
                      I:(DE-588b)4597118-3},
      pnm          = {6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ)
                      (POF4-6G4) / 632 - Materials – Quantum, Complex and
                      Functional Materials (POF4-632)},
      pid          = {G:(DE-HGF)POF4-6G4 / G:(DE-HGF)POF4-632},
      experiment   = {EXP:(DE-MLZ)MARIA-20140101},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {33797254},
      UT           = {WOS:000640891400003},
      doi          = {10.1021/acs.langmuir.0c03235},
      url          = {https://juser.fz-juelich.de/record/903843},
}