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Título:
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On the Bimodal Effects of Silicic Acids on Calcite Growth
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Autores:
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Pina Martínez, Carlos Manuel ;
Merkel, Casjen ;
Guntram, Jordan
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Tipo de documento:
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texto impreso
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Editorial:
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American Chemical Society, 2009
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Geología: Cristalografía
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Tipo = Artículo
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Resumen:
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The effects of silicic acids on calcite growth are a model for the effects of partially polymerized additives on crystal growth. At alkaline pH, silicic acid polymers coexist with small mono- and oligomers. Atomic force microscopy (AFM) showed that large polymers promote two-dimensional nucleation, while mono- and oligomers have a bimodal promoter/inhibitor effect on step propagation. This bimodality can be interpreted as the result of attachment of mono- and oligomers along the steps along with a modification of the kinetics of kink generation and/or propagation. The bimodal step kinematic effect is accompanied by a single morphologic effect: growth islands transform from a rhombus into an ellipse. This effect has been reported for other additives, indicating that many additives generate few morphologies. Such a convergence limits the versatility of chemical control on biomorphogenesis. Contrarily, the strong kinetic effect of silicic acids may make them very efficient controllers of biomorphogenesis, if coupled with a physical shape control, for example, by templates. Thus, silicic acids show a unique bimodality as a controller of calcite biomineralisation and as an abundant biomineral.
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En línea:
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https://eprints.ucm.es/id/eprint/51668/1/On%20the%20Bimodal%20Effects%20of%20Silicic%20Acids%20on%20Calcite%20Growth%20Pina%20Merkel%20Jordan%202009-2.pdf
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