Effect of structural iron on nanoscroll formation via exfoliation of a high iron-content kaolin
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Published:2022-10-20
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Volume:
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ISSN:0884-2914
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Container-title:Journal of Materials Research
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language:en
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Short-container-title:Journal of Materials Research
Author:
Zsirka BalázsORCID, Győrfi KatalinORCID, Yamaguchi TakahideORCID, Táborosi AttilaORCID, Vágvölgyi VeronikaORCID, Parameswary Clara, Homonnay ZoltánORCID, Kuzmann ErnőORCID, Horváth Erzsébet, Kristóf János
Abstract
AbstractNanoscroll formation by casacade intercalation–exfoliation method was investigated for a high iron-content kaolin and after the removal of its iron-bearing mineral constituents (goethite, hematite) by 11 M HCl treatment. Hindered kaolinite nanoscroll formation was observed by TEM in both cases, where the 11 M HCl treatment only slightly improved the occurrence of nanoscrolled shapes. The presence of minor amounts of well-dispersed, resilient Fe was observed after the exfoliation of 11 M HCl-treated sample, which was identified as structural Fe3+/Fe2+ in the octahedral sheet of kaolinite by Mössbauer and X-ray absorption spectroscopy. Iron substitution in the nanokaolinite TO layers was probed by computational chemistry. The computational results indicate inner coordination changes and elongation of bonds in the iron-substituted TO structure, and the increased curvature values offer an explanation for the observed experimental results for hindered nanoscroll formation.
Graphical abstract
Funder
Nemzeti Kutatási, Fejlesztési és Innovaciós Alap
Publisher
Springer Science and Business Media LLC
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
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