Hierarchically Structured Materials by Anodic Coagulation Casting of Fibrinogenic Alumina Suspensions
Article first published online: 2 MAY 2013
© 2013 The American Ceramic Society
Journal of the American Ceramic Society
Volume 96, Issue 6, pages 1745–1750, June 2013
How to Cite
Zehbe, R., Fleck, C. (2013), Hierarchically Structured Materials by Anodic Coagulation Casting of Fibrinogenic Alumina Suspensions. Journal of the American Ceramic Society, 96: 1745–1750. doi: 10.1111/jace.12344
- Issue published online: 6 JUN 2013
- Article first published online: 2 MAY 2013
- Manuscript Accepted: 18 MAR 2013
- Manuscript Received: 27 NOV 2012
- DFG. Grant Number: SPP1420
Anodic coagulation casting of fibrinogenic ceramic suspensions is a novel processing technology, which is based on the electrically induced transformation of the water soluble fibrinogen into the insoluble fibrin. Contrary to the direct coagulation casting (DCC) technology, green formation does not depend on a pH-shift and as the fibrin coagulate forms on an anode, it can be combined with the electrophoretic deposition (EPD) technology.
In this study, the conversion of fibrinogen into fibrin is activated via electron transfer processes at an electrode material and is combined with the green formation of alumina by embedding the ceramic particles in the protein matrix. The focus of this work was to establish a technology to shape thin hierarchically structured ceramic films and thick porous materials with a distinct pore structure. Film thickness and porosity were controlled by the applied voltage and the processing-time. The range of the established green bodies included two-dimensional and simple three-dimensional shapes including multilayered deposition and fiber coatings. Overall the process of anodic coagulation casting can be reported to be successful for all established ceramic shapes except multilayers, where delamination was observed. The deposited alumina ceramics were characterized using light microscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM), and synchrotron micro computed tomography (μCT), while the coagulation mechanism was studied using high-performance liquid chromatography (HPLC).