# Ammonia Uptake from Ambient Air by Protonic Layered Metal Oxide as a Cause of the Gradual Degradation of Its Swelling Reactivity

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## Id

508fc034-9d39-44db-a9ae-80c35c3fdcc6

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-09-16T07:55:35.600354Z

## Updated at

2025-09-17T03:30:20.032372Z

## Published at

2025-09-17T03:18:27.723984Z

## Doi



## First published url

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

## Date published

2025-09-16

## Recorded date published

2025-9-16

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Ammonia Uptake from Ambient Air by Protonic Layered Metal Oxide as a Cause
    of the Gradual Degradation of Its Swelling Reactivity
  title_type: original
  lang: en

## Description

- description: 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.
  description_type: abstract
  lang: und

## Creator

- name: Nobuyuki Sakai
  role: author
  orcid: https://orcid.org/0000-0002-9395-6751
- name: Ritesh Uppuluri
  role: author
  orcid: https://orcid.org/0000-0003-0595-7963
- name: Nobuo Iyi
  role: author
  orcid: https://orcid.org/0000-0001-5547-7031
- name: Yasuo Ebina
  role: author
  orcid: https://orcid.org/0000-0003-3471-9825
- name: Renzhi Ma
  role: author
  orcid: https://orcid.org/0000-0001-7126-2006
- name: Takayoshi Sasaki
  role: author
  orcid: https://orcid.org/0000-0002-2872-0427

## Contact agent



## Publisher

organization: American Chemical Society (ACS)

## Managing organization



## Keyword

- subject: layered metal oxide
  schema: not_defined
- subject: swelling reactivity
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Langmuir
  issn: '07437463'
  volume: '41'
  issue: '36'
  article_number: acs.langmuir.5c03503

## Conference



## Related item



## Funding

- funder_name: Ministry of Education, Culture, Sports, Science and Technology
- identifier: JPMJCR22B1
  funder_name: Core Research for Evolutional Science and Technology

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



## Specific property for specimen



## Process for specimen treatment



## Computational method



## Energy level/transition state



## Software



## Custom property



## Fileset

- id: b86b4a21-0a51-4f6a-98fe-874ba5800cf6
  filename: sakai-et-al-2025-ammonia-uptake-from-ambient-air-by-protonic-layered-metal-oxide-as-a-cause-of-the-gradual-degradation.pdf
  content_type: application/pdf
  size: 6119847
  md5: 0f331675e479d6b082d7746e7aca0b0e
- id: 8c2ceab1-cfc6-4870-900e-c7a87ba549b5
  filename: la5c03503_si_001.pdf
  content_type: application/pdf
  size: 1136939
  md5: 9a831a53dbe9eeb9682fd83b77862786

## Thumbnail

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filename: sakai-et-al-2025-ammonia-uptake-from-ambient-air-by-protonic-layered-metal-oxide-as-a-cause-of-the-gradual-degradation.pdf