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• Arancibia-Miranda, N
• Escudey, M
• Molina, M
• García-González, MTeresa
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• Escudey, M
• Molina, M
• García-González, MTeresa
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• Arancibia-Miranda, N
• Escudey, M
• Molina, M
• García-González, MTeresa

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Nanomaterials 2013, 3(1), 126-140; doi:10.3390/nano3010126

Article

Kinetic and Surface Study of Single-Walled Aluminosilicate Nanotubes and Their Precursors

Nicolás Arancibia-Miranda ^1,2,* , Mauricio Escudey ^1,2 , Mauricio Molina ³  and María Teresa García-González ⁴

¹ Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Santiago 9170124, Chile ² Faculty of Chemistry and Biology, University of Santiago of Chile, Av. B. O'Higgins, Santiago 3363, Chile ³ Departament of Industry, Federico Santa María Technical University, Av. Santa María 6400, Santiago 766-0251, Chile ⁴ Institute for Agricultural Sciences, Spanish National Research Council, Serrano 115-dup., Madrid 28006, Spain

* Author to whom correspondence should be addressed.

Received: 19 December 2012; in revised form: 10 February 2013 / Accepted: 11 February 2013 / Published: 1 March 2013

(This article belongs to the Special Issue New Developments in Nanomaterial Analysis)

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Abstract: The structural and surface changes undergone by the different precursors that are produced during the synthesis of imogolite are reported. The surface changes that occur during the synthesis of imogolite were determined by electrophoretic migration (EM) measurements, which enabled the identification of the time at which the critical precursor of the nanoparticles was generated. A critical parameter for understanding the evolution of these precursors is the isoelectric point (IEP), of which variation revealed that the precursors modify the number of active ≡Al-OH and ≡Si-OH sites during the formation of imogolite. We also found that the IEP is displaced to a higher pH level as a consequence of the surface differentiation that occurs during the synthesis. At the same time, we established that the pH of the reaction (pH_rx) decreases with the evolution and condensation of the precursors during aging. Integration of all of the obtained results related to the structural and surface properties allows an overall understanding of the different processes that occur and the products that are formed during the synthesis of imogolite.

Keywords: metal oxide nanotubes; imogolite; growth kinetics; isoelectric point; electrophoretic characterisation

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