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@INPROCEEDINGS{Qdemat:891616,
      author       = {Qdemat, Asmaa},
      title        = {{M}agnetic {N}anoparticles: {F}rom {N}anoscale to
                      {M}esoscale},
      reportid     = {FZJ-2021-01627},
      year         = {2021},
      abstract     = {Magnetic nanoparticles find promising applications in
                      biomedicine. Examples of these applications include new
                      methods for cancer treatment, such as magnetic drug
                      targeting [1] and magnetic hyperthermia [2], or it can be
                      used as contrast agents or tracers in magnetic resonance
                      imaging [3] and magnetic particle imaging [4]. Such
                      applications require magnetic nanoparticles with customized
                      structural and magnetic properties, strongly dependent on
                      particle size and shape [5]. Nanoparticle's shape is of key
                      importance and significantly impacts their magnetic
                      properties for their use in several applications. The
                      nanoparticles' magnetic shape anisotropy can be assumed much
                      larger than the magnetocrystalline anisotropy and can
                      strongly affect magnetic moments orientation inside the
                      particles. Moreover, the dipolar interaction between the
                      nanoparticles depends on the particle shape and will
                      influence the structural agglomerate formation.Recent
                      advances in nanoparticle synthesis techniques have enabled
                      the synthesis of a wide variety of precisely controlled,
                      non-spherical particles, including cubes, cube-like shapes
                      [6], and ellipsoids. Nanoparticles with a shape that
                      deviates from a perfect cube have gained much interest and
                      become experimentally available because they strongly
                      influence the nanocubes' large-scale arrangement. Cube
                      Nanoparticles with rounded edges result in an anisotropic
                      shape known as a superellipsoid [7] or superball, which is
                      an asymmetric body that describes the shape that smoothly
                      interpolates between a sphere and a cube. To the best of my
                      knowledge, there's no available theoretical model for the
                      evaluation of SAXS data of particles with superball shape,
                      and only it has been approximated by spheres of different
                      radii [8]. Therefore, a theoretical form factor for a more
                      precise evaluation of the SAXS data of superball particles
                      has been developed, and it will be presented in our
                      contribution.Also, in this contribution, we will present a
                      combined study of magnetic field-dependent SAXS and XPCS
                      measurements on hematite (α-Fe2O3) nanospindles, giving
                      insight into the particle morphological information (length,
                      radius, size distribution), magnetic orientation, and
                      microscopic dynamics (relaxation of nanospindles). Hematite
                      nanospindles are receiving considerable attention due to
                      their unique behavior in an applied magnetic field. In
                      contrast to other elongated nanoparticles, they bear a
                      strong magnetocrystalline anisotropy and orient with their
                      long axis perpendicular to an applied magnetic field above
                      the Morin transition (TM = 263 K) [9].Moreover, we will show
                      in our contribution the field-dependent polarized SANS
                      results of different nanospheres. Additionally, SANSPOL
                      results with and without applied magnetic field on pure
                      dispersion of hematite nanospindles and for hybrid
                      ferrofluidic dispersion consisting of hematite nanospindles
                      decorated with spherical ferrite nanoparticles will be
                      presented. The in-situ structure formation in such hybrid
                      ferrofluids includes the orientational behavior of
                      anisotropic structures as a function of the applied magnetic
                      field to elucidate the correlation of superstructure
                      formation and ferrofluidic properties, is
                      studied.References[1] Mejías, R., Pérez-Yagüe, S.,
                      Gutiérrez, L. et al. (2011). Dimercaptosuccinic acid-coated
                      magnetite nanoparticles for magnetically guided in vivo
                      delivery of interferon gamma for cancer immunotherapy.
                      Biomaterials, 32(11), 2938–2952.
                      https://doi.org/10.1016/j.biomaterials.2011.01.008[2]
                      Maier-Hauff, K., Ulrich, F., Nestler, D. et al. (2011).
                      Efficacy and safety of intratumoral thermotherapy using
                      magnetic iron-oxide nanoparticles combined with external
                      beam radiotherapy on patients with recurrent glioblastoma
                      multiforme. Journal of Neuro-Oncology, 103(2), 317–324.
                      https://doi.org/10.1007/s11060-010-0389-0[3] Shin, T.-H.,
                      Choi, Y., Kim, S., $\&$ Cheon, J. (2015). Recent advances in
                      magnetic nanoparticle-based multi-modal imaging. Chemical
                      Society Reviews, 44(14), 4501–4516.
                      https://doi.org/10.1039/C4CS00345D[4] Khandhar, A. P.,
                      Ferguson, R. M., Arami, H., $\&$ Krishnan, K. M. (2013).
                      Monodisperse magnetite nanoparticle tracers for in vivo
                      magnetic particle imaging. Biomaterials, 34(15),
                      3837–3845.
                      https://doi.org/10.1016/j.biomaterials.2013.01.087[5]
                      Hilger, I., $\&$ Kaiser, W. A. (2012). Iron oxide-based
                      nanostructures for MRI and magnetic hyperthermia.
                      Nanomedicine, 7(9), 1443–1459.
                      https://doi.org/10.2217/nnm.12.112[6] Wetterskog, E., Agthe,
                      M., Mayence, A.et al. (2014). Precise control over shape and
                      size of iron oxide nanocrystals suitable for assembly into
                      ordered particle arrays. Science and Technology of Advanced
                      Materials, 15(5), 055010.
                      https://doi.org/10.1088/1468-6996/15/5/055010[7] Rossi, L.,
                      Sacanna, S., Irvine, W. T. M., Chaikin, P. M., Pine, D. J.,
                      $\&$ Philipse, A. P. (2011). Cubic crystals from cubic
                      colloids. Soft Matter, 7(9), 4139–4142.
                      https://doi.org/10.1039/C0SM01246G[8] Donaldson, J. G.,
                      Linse, P., $\&$ Kantorovich, S. S. (2017). How cube-like
                      must magnetic nanoparticles be to modify their
                      self-assembly? Nanoscale, 9(19), 6448–6462.
                      https://doi.org/10.1039/C7NR01245D[9] Morrish A H. (1994).
                      Canted Antiferromagnetism: Hematite, (Singapore: World
                      Scientific)},
      month         = {Apr},
      date          = {2021-04-08},
      organization  = {Digital Institute Seminar JCNS-2,
                       online event (online event), 8 Apr 2021
                       - 8 Apr 2021},
      subtyp        = {Invited},
      cin          = {JCNS-2 / PGI-4 / JARA-FIT},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      $I:(DE-82)080009_20140620$},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (FZJ) (POF4-6G4)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G4},
      typ          = {PUB:(DE-HGF)31},
      url          = {https://juser.fz-juelich.de/record/891616},
}