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Bioinspired Struvite Mineralization for Fire-Resistant Wood
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posted on 2019-01-09, 00:00 authored by Huizhang Guo, Mirko Luković, Miller Mendoza, Christian M. Schlepütz, Michele Griffa, Biwan Xu, Sabyasachi Gaan, Hans Herrmann, Ingo BurgertHigh-performance
wood materials have attracted significant attention in recent years
because of excellent property profiles achieved by relatively easy
top-down processing of a renewable resource. A crucial flaw of the
renewable wood scaffolds is the low flame retardancy, which we tackled
by bioinspired mineralization in an eco-friendly processing step.
The formation of the biomineral struvite, commonly found in urinary
tract stones, was used for the infiltration of hierarchical wood structures
with the necessary ions followed by an in situ synthesis of struvite
by ammonium steam fumigation. Struvite decomposes prior to wood, which
absorbs heat and releases nonflammable gas and amorphous MgHPO4 resulting from the degradation, which promotes insulating
char formation. As a result, the mineralized wood can hardly be ignited
and the treatment strongly suppresses the heat release rate and smoke
production.
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top-down processingflame retardancyMgHPO 4smoke productionwood structurestract stonesheat release rateeco-friendly processing stepbioinspired mineralizationwood scaffoldsbiomineral struviteformationproperty profilesFire-Resistant Wood High-performance wood materialsBioinspired Struvite Mineralizationammonium steam fumigation
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