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Poly(ethylene imine)-controlled Calcium Phosphate mineralization

  • Shkilnyy, Andriy Institute of Chemistry, University of Potsdam, Golm, Germany - Max-Planck-Institute of Colloids and Interfaces, Golm, Germany
  • Friedrich, Alwin Institute of Chemistry, University of Potsdam, Golm, Germany
  • Tiersch, Brigitte Institute of Chemistry, University of Potsdam, Golm, Germany
  • Schöne, Stefanie Institute of Chemistry, University of Potsdam, Golm, Germany
  • Fechner, Mabya Institute of Chemistry, University of Potsdam, Golm, Germany
  • Koetz, Joachim Institute of Chemistry, University of Potsdam, Golm, Germany
  • Schläpfer, Carl-Wilhelm Department of Chemistry, University of Fribourg, Switzerland
  • Taubert, Andreas Institute of Chemistry, University of Potsdam, Golm, Germany - Max-Planck-Institute of Colloids and Interfaces, Golm, Germany
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    19.01.2008
Published in:
  • Langmuir. - 2008, vol. 24, no. 5, p. 2102–2109
English The current paper shows that poly(ethylene imine) (PEI) is an efficient template for the fabrication of spherical calcium phosphate (CaP)/polymer hybrid particles at pH values above 8. The polymer forms spherical entities, which contain one or a few CaP particles with diameters of ca. 6 nm. The samples contain up to 20 wt % polymer, which appears to be wrapped around the small CaP particles. The particles form via a mineralization-trapping pathway, where at the beginning of the precipitation small CaP particles form. Further particle growth is then prevented by precipitation of the PEI onto these particles at pH values of ca. 8. Stabilization of the particles is provided by the re-protonation of the PEI, which is adsorbed on the CaP particles, during the remainder of the mineralization process. At low pH, much larger particles form. They most likely grow via heterogeneous nucleation and growth on existing, polymer-modified CaP surfaces.
Faculty
Faculté des sciences et de médecine
Department
Département de Chimie
Language
  • English
Classification
Chemistry
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/300892
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