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説明:

We systematically investigated the conditions that lead to the loss of swelling ability, using protonic layered perovskite crystals of HCa2Nb3O10·1.5H2O as a representative example. The crystals were stored under various conditions, including ambient air, sealed environments, and dry/humid conditions, both in the dark and under light. Their reactivity with dimethylaminoethanol (DMAE) was then examined. We found that only the crystals exposed to ambient air for more than 10 days lost their swelling ability, whereas those stored under other conditions retained their reactivity. Based on these results, we speculated that ammonia, the most abundant alkaline component in the atmosphere, is absorbed from the air via acid-base interaction. This hypothesis was confirmed through XRD and FT-IR characterization. We conclude that trace amounts of ammonia in the atmosphere intercalate into the acidic interlayer galleries and are responsible for the degradation in reactivity. Furthermore, the original reactivity can be easily restored by acid treatment, which replaces the intercalated ammonium ions with protons, thereby recovering the swelling capability.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: layered metal oxide, swelling reactivity

刊行年月日: 2025-09-16

出版者: American Chemical Society (ACS)

掲載誌:

• Langmuir (ISSN: 07437463) vol. 41 issue. 36 acs.langmuir.5c03503

研究助成金:

• Ministry of Education, Culture, Sports, Science and Technology
• Core Research for Evolutional Science and Technology JPMJCR22B1

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1021/acs.langmuir.5c03503

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更新時刻: 2025-09-17 12:30:20 +0900

MDRでの公開時刻: 2025-09-17 12:18:27 +0900