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On the key role of the surface of palygorskite nanofibers in the stabilization of hexagonal metastable β-Ag2CO3 phase in palygorskite-based nanocomposites

Abstract : This study reports an original remarkable effect of fibrous palygorskite clay mineral in the stabilization at the ambient temperature of the metastable hexagonal β-phase of Ag2CO3 along with the stable monoclinic one (m-Ag2CO3) and the refinement of their particles size (≈5–10 nm). These structural and microstructural features likely arise owing to heterogeneous nucleation induced by the surface of palygorskite fibers between CO32– anions in solution and Ag+ exchanged palygorskite (Ag+-Pal) as reactants kept maturing for short periods, which should not exceed 1 h. Besides, the phase composition of Ag2CO3 supported on palygorskite, namely β- and m-structures can be monitored by carrying on appropriate low temperature treatments under CO2 atmosphere coupled with aging during several months in such a way that either pure β or m single-phases as well as biphased mixtures with controlled composition can be obtained. Taking into account experimental results and literature data, a growth mechanism is discussed.
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https://hal.archives-ouvertes.fr/hal-02073563
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Submitted on : Wednesday, March 20, 2019 - 8:50:29 AM
Last modification on : Friday, January 10, 2020 - 9:08:25 PM
Long-term archiving on: : Friday, June 21, 2019 - 12:42:52 PM

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Omar Lakbita, Benaïssa Rhouta, Francis Maury, François Senocq, M'Barek Amjoud, et al.. On the key role of the surface of palygorskite nanofibers in the stabilization of hexagonal metastable β-Ag2CO3 phase in palygorskite-based nanocomposites. Applied Clay Science, Elsevier, 2019, 172, pp.123-134. ⟨10.1016/j.clay.2019.02.023⟩. ⟨hal-02073563⟩

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