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Combined Hydrothermal Conversion and Vapor Transport Sintering of Ag-Modified Calcium Phosphate Scaffolds

Schlosser, Margarete and Fröls, Sabrina and Hauf, Ulla and Sethmann, Ingo and Schultheiss, Stefanie and Pfeifer, Felicitas and Kleebe, Hans-Joachim (2013):
Combined Hydrothermal Conversion and Vapor Transport Sintering of Ag-Modified Calcium Phosphate Scaffolds.
In: Journal of the American Ceramic Society, pp. 412-419, 96, (2), [Article]

Abstract

Two processing methods were successfully combined to obtain Ag-modified calcium phosphate scaffolds with antibacterial properties: (i) hydrothermal conversion of macroporous biogenic carbonates and (ii) vapor transport sintering. Hydrothermal conversion of two precursor materials, i.e., coral skeletons and sea urchin spines, resulted in the pseudomorphic replacement of highly porous calcium carbonates by calcium phosphate scaffolds. Vapor transport sintering of these scaffolds within a reactive AgCl atmosphere facilitated near net-shape processing accompanied by the condensation of finely dispersed Ag-bearing particles over the scaffold's surface. Chemical and phase compositions were analyzed using WDXRF, XRD, and DRIFTS (FTIR), and the microstructure development was characterized by SEM and TEM imaging. The dissolution kinetics of Ag+ ions in aqueous solution was determined and growth inhibition experiments with Gram-positive and Gram-negative bacteria were performed to assess the antibacterial properties of Ag-modified ceramics.

Item Type: Article
Erschienen: 2013
Creators: Schlosser, Margarete and Fröls, Sabrina and Hauf, Ulla and Sethmann, Ingo and Schultheiss, Stefanie and Pfeifer, Felicitas and Kleebe, Hans-Joachim
Title: Combined Hydrothermal Conversion and Vapor Transport Sintering of Ag-Modified Calcium Phosphate Scaffolds
Language: English
Abstract:

Two processing methods were successfully combined to obtain Ag-modified calcium phosphate scaffolds with antibacterial properties: (i) hydrothermal conversion of macroporous biogenic carbonates and (ii) vapor transport sintering. Hydrothermal conversion of two precursor materials, i.e., coral skeletons and sea urchin spines, resulted in the pseudomorphic replacement of highly porous calcium carbonates by calcium phosphate scaffolds. Vapor transport sintering of these scaffolds within a reactive AgCl atmosphere facilitated near net-shape processing accompanied by the condensation of finely dispersed Ag-bearing particles over the scaffold's surface. Chemical and phase compositions were analyzed using WDXRF, XRD, and DRIFTS (FTIR), and the microstructure development was characterized by SEM and TEM imaging. The dissolution kinetics of Ag+ ions in aqueous solution was determined and growth inhibition experiments with Gram-positive and Gram-negative bacteria were performed to assess the antibacterial properties of Ag-modified ceramics.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 96
Number: 2
Divisions: 10 Department of Biology
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10 Department of Biology > Microbiology and Archaea
Date Deposited: 29 Jan 2013 07:28
Identification Number: doi:10.1111/jace.12137
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