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|Title:||Microscopy and spectroscopy analysis of carbon nanostructures in highly fertile Amazonian anthrosoils|
Cançado, Luiz Gustavo
Falcão, Newton P.S.
dos Santos, Hélio Ferreira
Baptista, Daniel Lorscheitter
Martins Ferreira, E. H.
Archanjo, Bráulio Soares
Achete, Carlos Alberto
|Keywords:||Carbon Based Materials|
Electron Energy Loss
Energy Dispersive X-ray
Ion Exchange Capacity
Scanning And Transmission Electron Microscopy
Electron Energy Loss Spectroscopy
Particles (particulate Matter)
Transmission Electron Microscopy
|metadata.dc.publisher.journal:||Soil and Tillage Research|
|metadata.dc.relation.ispartof:||Volume 122, Pags. 61-66|
|Abstract:||The anthropogenic Amazonian soil " Terra Preta de índio" (Amazonian Dark Earth) provides a potential model for a sustainable land-use system in the humid tropics. A large amount of carbon-based materials in this soil is responsible for its high fertility over long periods of usage, and soil scientists are trying to create " Terra Preta Nova" (New Dark Earth) by adding charcoal as a soil conditioner. By applying materials science tools, including scanning and transmission electron microscopy, energy dispersive X-ray, electron energy loss spectroscopy and Raman spectroscopy, we show that these millenary carbon materials exhibit a complex morphology, with particles ranging in size from micro- to nanometers, from the core to the surface of the carbon grains. From one side, our results might elucidate how nature solved the problem of keeping high levels of ion exchange capacity in these soils. From the other side, morphology and dimensionality are the key issues in nanotechnology, and the structural aspects revealed here may help generating the Terra Preta Nova, effectively improving world agriculture and ecosystem sustainability. © 2012 Elsevier B.V.|
|Appears in Collections:||Artigos|
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