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@ARTICLE{Khodan:861705,
      author       = {Khodan, A. and Nguyen, T. H. N. and Esaulkov, M. and
                      Kiselev, M. R. and Amamra, M. and Vignes, J.-L. and Kanaev,
                      A.},
      title        = {{P}orous monoliths consisting of aluminum oxyhydroxide
                      nanofibrils: 3{D} structure, chemical composition, and phase
                      transformations in the temperature range 25–1700 °{C}},
      journal      = {Journal of nanoparticle research},
      volume       = {20},
      number       = {7},
      issn         = {1572-896X},
      address      = {Dordrecht [u.a.]},
      publisher    = {Springer Science + Business Media B.V},
      reportid     = {FZJ-2019-02135},
      pages        = {194},
      year         = {2018},
      abstract     = {We present a study on the chemical and structural
                      transformations in highly porous monolitic materials
                      consisting of the nanofibrils of aluminum oxyhydroxides
                      (NOA, Al2O3·nH2O) in the temperature range 20–1700 °C. A
                      remarkable property of the NOA material is the preservation
                      of the monolithic state during annealing over the entire
                      temperature range, although the density of the monolith
                      increases from ~0.02 up to ~3 g/cm3, the total porosity
                      decreases from 99.3 to $25\%$ and remains open up to 4 h
                      annealing at the temperature ~1300 °C. The physical
                      parameters of NOA monoliths such as density, porosity,
                      specific area were studied and a simple physical model
                      describing these parameters as the function of the average
                      size of NOA fibrils—the basic element of 3D
                      structure—was proposed. The observed thermally induced
                      changes in composition and structure of NOA were
                      successfully described and two mechanisms of mass transport
                      in NOA materials were revealed. (i) At moderate temperatures
                      (T ≤ 800 °C), the mass transport occurs along a
                      surface of amorphous single fibril, which results in a weak
                      decrease of the length-to-diameter aspect ratio from the
                      initial value ~24 till ~20; the corresponding NOA porosity
                      change is also small: from initial ~99.5 to $98.5\%.$ (ii)
                      At high temperatures (T > 800 °C), the mass transport
                      occurs in the volume of fibrils, that results in changes of
                      fibrils shape to elliptical and strong decrease of the
                      aspect ratio down to ≤ 2; the porosity of NOA decreases
                      to $25\%.$ These two regimes are characterized by activation
                      energies of 28 and 61 kJ/mol respectively, and the
                      transition temperature corresponds to the beginning of
                      γ-phase crystallization at 870 °C.},
      cin          = {JCNS-FRM-II / Neutronenstreuung ; JCNS-1},
      ddc          = {570},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106},
      pnm          = {6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
                      / 6G15 - FRM II / MLZ (POF3-6G15)},
      pid          = {G:(DE-HGF)POF3-6G4 / G:(DE-HGF)POF3-6G15},
      experiment   = {EXP:(DE-MLZ)KWS2-20140101 / EXP:(DE-MLZ)KWS3-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000438821500001},
      doi          = {10.1007/s11051-018-4285-4},
      url          = {https://juser.fz-juelich.de/record/861705},
}