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Amino acids in iron oxide mineralization: (incomplete) crystal phase selection is achieved even with single amino acids

  • Mantion, Alexandre Department of Chemistry, University of Basel, Switzerland - Department of Chemistry, Humboldt University, Berlin, Germany
  • Gozzo, Fabia Swiss Light Source, Paul-Scherrer-Institute, Villigen, Switzerland
  • Schmitt, Bernd Swiss Light Source, Paul-Scherrer-Institute, Villigen, Switzerland
  • Stern, Willem B. Department of Environmental Geosciences, University of Basel, Switzerland
  • Gerber, Yvonne Department of Environmental Geosciences, University of Basel, Switzerland
  • Robin, Adeline Y. Laboratoire de cristallogénèse et cristallographie des protéines, Institut de Biologie Structurale Jean-Pierre Ebel, CEA-CNRS-University J. Fourier, Grenoble, France
  • Fromm, Katharina M. Department of Chemistry, University of Fribourg, Switzerland
  • Painsi, Monika Institute of Geological Sciences, University of Bern, Switzerland
  • Taubert, Andreas Department of Chemistry, University of Basel, Switzerland - Swiss Light Source, Paul-Scherrer-Institute, Villigen, Switzerland - Institute of Chemistry, University of Potsdam, Golm, Germany
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    22.06.2008
Published in:
  • The Journal of Physical Chemistry C. - 2008, vol. 112, no. 32, p. 12104–12110
English Iron oxides are important minerals in biology and materials science. Using biomimetic synthesis, a variety of iron oxides have been fabricated. However, it is still not clear how growth modifiers like amino acids and peptides select different crystal phases of a complex material like iron oxide. The current paper shows that already with single amino acids, (incomplete) crystal phase selection is achieved in vitro. In particular, L-histidine, L-threonine, and L-cysteine favor the formation of unstable crystal phases like ferrihydrite or lepidocrocite, although sometimes only at high amino acid concentrations. Other amino acids like L-valine have only minor effects when compared to control samples grown in the absence of amino acids. The effects of the amino acids can be rationalized via kinetic trapping and different interaction strengths of the amino acids with the growing iron oxide particles. The effects of the amino acids on the particle morphologies are less significant. The paper therefore shows that single amino acids can be a valuable tool for the materials chemist to fabricate and stabilize even unstable iron oxide crystal phases.
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/300871
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