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    Université de Fribourg

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

    Mantion, Alexandre ; Gozzo, Fabia ; Schmitt, Bernd ; Stern, Willem B. ; Gerber, Yvonne ; Robin, Adeline Y. ; Fromm, Katharina M. ; Painsi, Monika ; Taubert, Andreas

    In: The Journal of Physical Chemistry C, 2008, vol. 112, no. 32, p. 12104–12110

    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...

    Université de Fribourg

    Silver nanoparticle engineering via oligovaline organogels

    Mantion, Alexandre ; Guex, A. Geraldine ; Foelske, Annette ; Mirolo, Laurent ; Fromm, Katharina M. ; Painsi, Monika ; Taubert, Andreas

    In: Soft Matter, 2008, vol. 4, no. 3, p. 606-617

    L-Valine-based oligopeptides with the chemical structure Z–(L-Val)₃–OMe and Z–(L-Val)₂–L-Cys(S-Bzl)–OMe form stable organogels in butanol. Both peptides are efficient gelators, but Z–(L-Val)₂–L-Cys(S-Bzl)–OMe crystallizes more readily than Z–(L-Val)₃–OMe. The two peptides can form mixed fibers, which also gel butanol. The resulting organogels are very similar to...