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@ARTICLE{Schulz:594921,
      author       = {Schulz, Florian and Jain, Avni and Dallari, Francesco and
                      Markmann, Verena and Lehmkühler, Felix},
      title        = {{I}n-situ aggregation and early states of gelation of gold
                      nanoparticle dispersions},
      journal      = {Soft matter},
      volume       = {20},
      number       = {18},
      issn         = {1744-683X},
      address      = {London},
      publisher    = {Royal Soc. of Chemistry},
      reportid     = {PUBDB-2023-06030},
      pages        = {3836-3844},
      year         = {2024},
      abstract     = {The aggregation and onset of gelation of PEGylated gold
                      nanoparticles dispersed in a glycerol–water mixture is
                      studied by small-angle X-ray scattering and X-ray photon
                      correlation spectroscopy. Tracking structural dynamics with
                      sub-ms time resolution over a total experimental time of 8
                      hours corresponding to a time windows larger than 108
                      Brownian times and varying the temperature between 298 K and
                      266 K we can identify three regimes. First, while cooling to
                      275 K the particles show Brownian motion that slows down due
                      to the increasing viscosity. Second, upon further cooling
                      the static structure changes significantly, indicated by a
                      broad structure factor peak. We attribute this to the
                      formation of aggregates while the dynamics are still
                      dominated by single-particle diffusion. Finally, the
                      relaxation functions become more and more stretched
                      accompanied by an increased slow down of the dynamics. At
                      the same time the structure changes continuously indicating
                      the onset of gelation. Our observations further suggest that
                      the colloidal aggregation and gelation is characterized
                      first by structural changes with a subsequent slowing down
                      of the systems dynamics. The analysis also reveals that the
                      details of the gelation process and the gel structure
                      strongly depend on the thickness of the PEG-coating of the
                      gold nanoparticles.},
      cin          = {FS-SMP / FS-CXS},
      ddc          = {530},
      cid          = {I:(DE-H253)FS-SMP-20171124 / I:(DE-H253)FS-CXS-20130727},
      pnm          = {633 - Life Sciences – Building Blocks of Life: Structure
                      and Function (POF4-633) / 6G3 - PETRA III (DESY) (POF4-6G3)
                      / FS-Proposal: I-20190529 (I-20190529) /
                      Ex-Net-0002-Phase2-3 - Advanced Imaging of Matter:
                      Structure, Dynamics and Control on the Atomic Scale - AIM
                      $(2018_Ex-Net-0002-Phase2-3)$},
      pid          = {G:(DE-HGF)POF4-633 / G:(DE-HGF)POF4-6G3 /
                      G:(DE-H253)I-20190529 /
                      $G:(DE-HGF)2018_Ex-Net-0002-Phase2-3$},
      experiment   = {EXP:(DE-H253)P-P10-20150101 /
                      EXP:(DE-MLZ)External-20140101},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {38651356},
      UT           = {WOS:001206309900001},
      doi          = {10.1039/D4SM00080C},
      url          = {https://bib-pubdb1.desy.de/record/594921},
}