Publikationen

Structural transformations of heat-treated bacterial iron oxide

Autor(en)
Hideki Hashimoto, Tatsuo Fujii, Shinji Kohara, Koji Nakanishi, Chihiro Yogi, Herwig Peterlik, Makoto Nakanishi, Jun Takada
Abstrakt

A bacterial siliceous iron oxide microtubule (diameter: ca. 1 mu m, 15Fe(2)O(3)center dot 8SiO(2)center dot P2O6 center dot 30H(2)O) produced by Leptothrbc ochracea was heat treated in air and its structural transformation was investigated in detail by microscopy, diffractometry, and spectroscopy. Although the heat-treated bacterial iron oxide retained its original microtubular structure, its nanoscopic, middle-range, and local structures changed drastically. Upon heat treatment, nanosized pores were formed and their size changed depending on temperature. The Fe O Si linkages were gradually cleaved with increasing temperature, causing the progressive separation of Fe and Si ions into iron oxide and amorphous silicate phases, respectively. Concomitantly, global connectivity and local structure of FeO6 octahedra in the iron oxide nanoparticles systematically changed depending on temperature. These comprehensive investigations clearly revealed various structural changes of the bacterial iron oxide which is an important guideline for the future exploration of novel bio-inspired materials.

Organisation(en)
Dynamik Kondensierter Systeme, Fakultätszentrum für Nanostrukturforschung
Externe Organisation(en)
Japan Synchrotron Radiat Res Inst, Japan Synchrotron Radiation Research Institute, Okayama University, Japan Science and Technology Agency , Kyoto University, Ritsumeikan University
Journal
Materials Chemistry and Physics
Band
155
Seiten
67-75
Anzahl der Seiten
9
ISSN
0254-0584
DOI
https://doi.org/10.1016/j.matchemphys.2015.01.067
Publikationsdatum
04-2015
Peer-reviewed
Ja
ÖFOS 2012
Materialphysik
Schlagwörter
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/structural-transformations-of-heattreated-bacterial-iron-oxide(63081ad9-209d-4099-a968-60e6341077ff).html