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@PHDTHESIS{Giesselmann:643119,
      author       = {Giesselmann, Niels Christian},
      othercontributors = {Stierle, Andreas and Lehmkühler, Felix and Froeba,
                          Michael},
      title        = {{X}-ray {S}cattering {I}nvestigations of the {S}tructure of
                      {W}ater and {I}ce in {P}eriodic {M}esoporous
                      {O}rganosilicas},
      school       = {University of Hamburg},
      type         = {Dissertation},
      address      = {Hamburg},
      publisher    = {Deutsches Elektronen-Synchrotron DESY},
      reportid     = {PUBDB-2026-00017},
      pages        = {113 pages: illustrations, diagrams},
      year         = {2026},
      note         = {Dissertation, University of Hamburg, 2025},
      abstract     = {Water is one of the most common materials on Earth and in
                      everyday life. However, with its many anomalies which in
                      many cases get further amplified when supercooled, it is
                      still poorly understood. A particularly interesting case is
                      water under confinement. When water is subject to spatial
                      restrictions, it has been found that the structure of its
                      network is influenced and its equilibrium and dynamical
                      properties vary. An interesting confining matrix for water
                      is found in the form of periodic mesoporous organosilicas
                      (PMOs). These materials enable mesoporous confinement in a
                      broad range of pore diameters with the possibility of tuning
                      the pore wall-water interaction. This is achieved by organic
                      moieties in the pore wall, which can house additional
                      functional groups. These groups can for example have
                      hydrophobic or hydrophilic properties. This thesis
                      investigates the structure of water and ice under
                      confinement in a broad range of PMOs with different pore
                      diameters and pore wall functionalizations, by use of X-ray
                      scattering. A strong dependence of the structure of confined
                      water on the pore functionalization, as well as the pore
                      diameter is found. Pores with smaller diameters and
                      hydrophilic functionalizations lead to a decrease in density
                      when compared to bulk water. Furthermore, a stronger
                      tetrahedral water network is observed in these pores. At
                      lower temperatures, an ice structure with diffuse
                      cubic-like, hexagonal and amorphous contributions is
                      observed. The hexagonal component also exhibits a shift in
                      its lattice parameters when compared to bulk hexagonal ice.
                      In smaller, hydrophilic pores, the ice crystallites are
                      furthermore oriented in specific, preferred angles compared
                      to the pore axis. It is also observed that the PMO host
                      materials undergo a deformation when water is being
                      adsorbed. Specifically, the periodicity of their organic
                      moieties changes in dependence on their interaction with
                      water.},
      cin          = {DOOR ; HAS-User},
      cid          = {I:(DE-H253)HAS-User-20120731},
      pnm          = {6G3 - PETRA III (DESY) (POF4-6G3) / FS-Proposal: I-20200440
                      (I-20200440) / FS-Proposal: I-20190201 (I-20190201) /
                      FS-Proposal: I-20220503 (I-20220503) / FS-Proposal:
                      I-20220497 (I-20220497)},
      pid          = {G:(DE-HGF)POF4-6G3 / G:(DE-H253)I-20200440 /
                      G:(DE-H253)I-20190201 / G:(DE-H253)I-20220503 /
                      G:(DE-H253)I-20220497},
      experiment   = {EXP:(DE-H253)P-P02.1-20150101 / EXP:(DE-H253)P-P03-20150101
                      / EXP:(DE-H253)P-P21.1-20150101},
      typ          = {PUB:(DE-HGF)11},
      url          = {https://bib-pubdb1.desy.de/record/643119},
}