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Insights into memory effect mechanisms of layered double hydroxides with solid-state NMR spectroscopy.


ABSTRACT: Layered double oxides (LDOs) can restore the parent layered double hydroxides (LDHs) structure under hydrous conditions, and this "memory effect" plays a critical role in the applications of LDHs, yet the detailed mechanism is still under debate. Here, we apply a strategy based on ex situ and in situ solid-state NMR spectroscopy to monitor the Mg/Al-LDO structure changes during recovery at the atomic scale. Despite the common belief that aqueous solution is required, we discover that the structure recovery can occur in a virtually solid-state process. Local structural information obtained with NMR spectroscopy shows that the recovery in aqueous solution follows dissolution-recrystallization mechanism, while the solid-state recovery is retro-topotactic, indicating a true "memory effect". The amount of water is key in determining the interactions of water with oxides, thus the memory effect mechanism. The results also provide a more environmentally friendly and economically feasible LDHs preparation route.

SUBMITTER: Jin L 

PROVIDER: S-EPMC9568524 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature

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Insights into memory effect mechanisms of layered double hydroxides with solid-state NMR spectroscopy.

Jin Li L   Zhou Xiaoyuan X   Wang Fang F   Ning Xiang X   Wen Yujie Y   Song Benteng B   Yang Changju C   Wu Di D   Ke Xiaokang X   Peng Luming L  

Nature communications 20221014 1


Layered double oxides (LDOs) can restore the parent layered double hydroxides (LDHs) structure under hydrous conditions, and this "memory effect" plays a critical role in the applications of LDHs, yet the detailed mechanism is still under debate. Here, we apply a strategy based on ex situ and in situ solid-state NMR spectroscopy to monitor the Mg/Al-LDO structure changes during recovery at the atomic scale. Despite the common belief that aqueous solution is required, we discover that the structu  ...[more]

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