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@ARTICLE{Krause:878318,
      author       = {Krause, Simon and Bon, Volodymyr and Du, Hongchu and
                      Dunin-Borkowski, Rafal E and Stoeck, Ulrich and Senkovska,
                      Irena and Kaskel, Stefan},
      title        = {{T}he impact of crystal size and temperature on the
                      adsorption-induced flexibility of the {Z}r-based
                      metal–organic framework {DUT}-98},
      journal      = {Beilstein journal of nanotechnology},
      volume       = {10},
      issn         = {2190-4286},
      address      = {Frankfurt, M.},
      publisher    = {Beilstein-Institut zur Förderung der Chemischen
                      Wissenschaften},
      reportid     = {FZJ-2020-02774},
      pages        = {1737 - 1744},
      year         = {2019},
      abstract     = {In this contribution we analyze the influence of adsorption
                      cycling, crystal size, and temperature on the switching
                      behavior of the flexible Zr-based metal–organic framework
                      DUT-98. We observe a shift in the gate-opening pressure upon
                      cycling of adsorption experiments for micrometer-sized
                      crystals and assign this to a fragmentation of the crystals.
                      In a series of samples, the average crystal size of DUT-98
                      crystals was varied from 120 µm to 50 nm and the obtained
                      solids were characterized by X-ray diffraction, infrared
                      spectroscopy, as well as scanning and transmission electron
                      microscopy. We analyzed the adsorption behavior by nitrogen
                      and water adsorption at 77 K and 298 K, respectively, and
                      show that adsorption-induced flexibility is only observed
                      for micrometer-sized crystals. Nanometer-sized crystals were
                      found to exhibit reversible type I adsorption behavior upon
                      adsorption of nitrogen and exhibit a crystal-size-dependent
                      steep water uptake of up to 20 mmol g−1 at 0.5 p/p0 with
                      potential for water harvesting and heat pump applications.
                      We furthermore investigate the temperature-induced
                      structural transition by in situ powder X-ray diffraction.
                      At temperatures beyond 110 °C, the open-pore state of the
                      nanometer-sized DUT-98 crystals is found to irreversibly
                      transform to a closed-pore state. The connection of crystal
                      fragmentation upon adsorption cycling and the crystal size
                      dependence of the adsorption-induced flexibility is an
                      important finding for evaluation of these materials in
                      future adsorption-based applications. This work thus extends
                      the limited amount of studies on crystal size effects in
                      flexible MOFs and hopefully motivates further investigations
                      in this field.},
      cin          = {ER-C-1 / ER-C-2},
      ddc          = {620},
      cid          = {I:(DE-Juel1)ER-C-1-20170209 / I:(DE-Juel1)ER-C-2-20170209},
      pnm          = {143 - Controlling Configuration-Based Phenomena (POF3-143)
                      / DFG project 167917811 - SFB 917: Resistiv schaltende
                      Chalkogenide für zukünftige Elektronikanwendungen:
                      Struktur, Kinetik und Bauelementskalierung "Nanoswitches"
                      (167917811)},
      pid          = {G:(DE-HGF)POF3-143 / G:(GEPRIS)167917811},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:31501745},
      UT           = {WOS:000482478100001},
      doi          = {10.3762/bjnano.10.169},
      url          = {https://juser.fz-juelich.de/record/878318},
}