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@ARTICLE{Cheng:207254,
      author       = {Cheng, Ya-Jun and Zhou, Shaoying and Wolkenhauer, Markus
                      and Bumbu, Gina-Gabriela and Lenz, Sebastian and Memesa,
                      Mine and Nett, Sebastian and Emmerling, Sebastian and
                      Steffen, Werner and Roth, Stephan V. and Gutmann, Jochen S.},
      title        = {{F}rom {S}pherical {M}esopores to {W}orm-{S}haped
                      {M}esopores: {M}orphology {T}ransition in
                      {T}itania-{P}olystyrene- b -poly(ethylene oxide) {C}omposite
                      {F}ilms with {I}ncreasing {S}ol-{G}el {R}eaction {T}ime},
      journal      = {European journal of inorganic chemistry},
      volume       = {2014},
      number       = {5},
      issn         = {1434-1948},
      address      = {Weinheim},
      publisher    = {Wiley-VCH},
      reportid     = {PUBDB-2015-01237},
      pages        = {836 - 844},
      year         = {2014},
      note         = {(c) WILEY-VCH Verlag GmbH $\&$ Co. KGaA},
      abstract     = {A morphology transition from spherical mesopores to
                      worm-shaped mesopores within titania block copolymer
                      composite thin films has been observed by varying the
                      sol–gel reaction time from 40 min to 48 h in the
                      four-component templating system of
                      polystyrene-$\mathit{b}$-poly(ethylene oxide)
                      (PS-$\mathit{b}$-PEO), 1,4-dioxane, concentrated HCl, and
                      titanium tetraisopropoxide (TTIP) with a PS-$\mathit{b}$-PEO
                      mass concentration of 0.25 wt.-\%. The impact of the
                      sol–gel reaction time on the local structure, long-range
                      lateral structure, and vertical structure of the
                      as-prepared, calcined, and UV-degraded thin films as well as
                      the structural changes in solution have been systematically
                      investigated by scanning electron microscopy (SEM), atomic
                      force microscopy (AFM), grazing-incidence small-angle X-ray
                      scattering (GISAXS), X-ray reflectivity (XRR), and dynamic
                      light scattering (DLS). With sol–gel reaction times of up
                      to 5 h, hexagonally organized spherical micelles are present
                      within the as-prepared composite films, in which the core of
                      the spherical micelles is composed of the polystyrene (PS)
                      block, and the corona is composed of the poly(ethylene
                      oxide)–titania (PEO–titania) hybrid. Upon calcination or
                      UV exposure, ordered mesoporous structures are formed owing
                      to the removal of the PS block. With the sol–gel reaction
                      time extended to 25 and 48 h, worm-shaped micelles appear,
                      and their quantity increases with increasing sol–gel
                      reaction time. Worm-shaped mesopores are formed by
                      calcination or UV degradation. The GISAXS results prove that
                      the local structural changes are representative over a
                      macroscopic scale. The XRR results suggest that with the
                      sol–gel reaction time extended to 48 h there is an
                      additional thin layer beneath the mesoporous titania layer
                      owing to the presence of a large amount of worm-shaped
                      micelles. The results of the DLS studies imply that the
                      morphology transition from spherical micelles to worm-shaped
                      micelles is caused by a fusion process of the spherical
                      micelles in solution.},
      cin          = {DOOR / FS-PE},
      ddc          = {540},
      cid          = {I:(DE-H253)HAS-User-20120731 / I:(DE-H253)FS-PE-20120731},
      pnm          = {PETRA Beamline P03 (POF2-54G14)},
      pid          = {G:(DE-H253)POF2-P03-20130405},
      experiment   = {EXP:(DE-H253)P-P03-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000331004200007},
      doi          = {10.1002/ejic.201301251},
      url          = {https://bib-pubdb1.desy.de/record/207254},
}