# Color-Controlled Nonstoichiometric Spinel-Type Cobalt Gallate Nanopigments Prepared by Supercritical Hydrothermal Synthesis

https://mdr.nims.go.jp/datasets/c1404bed-6e6c-4e9a-b611-9c5b8dd46456

## File

- [d3dt03086e.pdf](https://mdr.nims.go.jp/filesets/18a8a1ec-653e-4b4d-a5c4-c770f30f47d2/download) ([Detail](https://mdr.nims.go.jp/filesets/18a8a1ec-653e-4b4d-a5c4-c770f30f47d2.md))

## Id

c1404bed-6e6c-4e9a-b611-9c5b8dd46456

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2023-12-04T02:25:05.611524Z

## Updated at

2024-01-05T13:13:19.166463Z

## Published at

2023-12-09T04:30:24.539761Z

## Doi



## First published url

https://doi.org/10.1039/d3dt03086e

## Date published

2023-10-15

## Recorded date published

2023-11-14

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Color-Controlled Nonstoichiometric Spinel-Type Cobalt Gallate Nanopigments
    Prepared by Supercritical Hydrothermal Synthesis
  title_type: original
  lang: en

## Description

- description: "Spinel-type inorganic pigments with intensive color and chemical/thermal
    stability are showing extensive applications that could be further broadened by
    color manipulation and improvement of the material properties through nanosizing.
    In this study, we report supercritical hydrothermal synthesis of nonstoichiometric
    spinel-type cobalt gallate nanoparticles (Co–Ga NPs) with controlled color. Without
    the conventional calcination procedure, NPs with greenish–blue, blue, and yellowish–green
    colors were synthesized from precursor solutions at pH 7, 9, and 11, respectively,
    with a low Co/Ga molar ratio of 0.25.\r\nX-ray diffraction, scanning/transmission
    electron microscopy, and inductively coupled plasma-atomic emission spectroscopy
    methods suggest that the products were spinel-type cobalt gallate NPs with high
    crystallinity and a nonstoichiometric composition. Based on an X-ray absorption
    fine structure investigation, prepared nonstoichiometric Co–Ga NPs were found
    to have different metal distributions from stoichiometric CoGa2O4 produced by
    a solid-state reaction during calcination. Particularly, nonstoichiometric Co–Ga
    NPs with a blue color and a high crystallinity were prepared without calcination
    for the first time and were found to have lower tetrahedral cobalt occupancy but
    comparable octahedral cobalt occupancy compared to calcined CoGa2O4. We also discuss
    strategies that could realize Co–Ga NPs with a more brilliant blue color using
    the present technique based on an investigation of the growth process."
  description_type: abstract
  lang: eng

## Creator

- name: Bo Xie
  role: author
- name: Chiya Numako
  role: author
- name: Takashi Naka
  role: author
  orcid: https://orcid.org/0000-0002-0645-6952
  organization: National Institute for Materials Science
- name: Seiichi Takami
  role: author

## Contact agent



## Publisher

organization: Royal Society of Chemistry (RSC)

## Managing organization



## Keyword

- subject: cobalt callate
  schema: not_defined
- subject: supercritical hydrothermal synthesis
  schema: not_defined
- subject: pigment
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by-nc/3.0/legalcode

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: DALTON TRANSACTIONS
  issn: '14779226'
  volume: '52'
  issue: '44'
  start_page: 16285
  end_page: 16296

## Conference



## Related item



## Funding



## 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: 18a8a1ec-653e-4b4d-a5c4-c770f30f47d2
  filename: d3dt03086e.pdf
  content_type: application/pdf
  size: 2217493
  md5: 60beabd5c29292b190f6bc6337b08a2c

## Thumbnail

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filename: d3dt03086e.pdf