Arancibia-Miranda Nicolás, Escudey Mauricio, Molina Mauricio, García-González María Teresa
Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Santiago 9170124, Chile.
Faculty of Chemistry and Biology, University of Santiago of Chile, Av. B. O'Higgins, Santiago 3363, Chile.
Nanomaterials (Basel). 2013 Mar 1;3(1):126-140. doi: 10.3390/nano3010126.
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) 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.
报道了伊莫戈石合成过程中产生的不同前驱体所经历的结构和表面变化。通过电泳迁移（EM）测量确定了伊莫戈石合成过程中发生的表面变化，该测量能够确定纳米颗粒关键前驱体产生的时间。理解这些前驱体演变的一个关键参数是等电点（IEP），其变化表明前驱体在伊莫戈石形成过程中改变了活性≡Al-OH和≡Si-OH位点的数量。我们还发现，由于合成过程中发生的表面分化，等电点向更高的pH值水平移动。同时，我们确定反应的pH值（pH）随着老化过程中前驱体的演变和缩合而降低。整合所有与结构和表面性质相关的结果，可以全面了解伊莫戈石合成过程中发生的不同过程以及形成的产物。
