# Hollow skeletal macroporous aluminum hydroxide monoliths and their calcined derivatives with high diffuse reflectance

https://mdr.nims.go.jp/datasets/ac252dc1-b641-4eef-980e-246d9d7e613d

## File

- [Journal of the American Ceramic Society - 2025 - Hayase - Hollow skeletal macroporous aluminum hydroxide monoliths and.pdf](https://mdr.nims.go.jp/filesets/4ff9434f-aa96-46c0-bbcc-a94fbc4c504d/download) ([Detail](https://mdr.nims.go.jp/filesets/4ff9434f-aa96-46c0-bbcc-a94fbc4c504d.md))

## Id

ac252dc1-b641-4eef-980e-246d9d7e613d

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-12-02T02:16:12.281364Z

## Updated at

2025-12-02T07:30:11.019385Z

## Published at

2025-12-02T07:29:33.027580Z

## Doi



## First published url

https://doi.org/10.1111/jace.70276

## Date published

2025-09-26

## Recorded date published

2026-1

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Hollow skeletal macroporous aluminum hydroxide monoliths and their calcined
    derivatives with high diffuse reflectance
  title_type: original
  lang: en

## Description

- description: Macroporous aluminum hydroxide monoliths with continuous hollow skeletons
    were fabricated through a scalable, template-free sol‒gel synthesis from metal‒salt
    precursors. Tuning the concentration of propylene oxide, which serves as a proton
    scavenger, yielded crack-free monoliths several centimeters in diameter. Scanning
    electron microscopy revealed a three-dimensional porous network composed of an
    interconnected nanoplatelet shell. The as-prepared sample exhibited a Brunauer–Emmett–Teller-specific
    surface area of 429 m² g⁻¹. Calcination at 500 °C converted the framework into
    γ-alumina while preserving the hollow architecture and a high specific surface
    area of 314 m² g⁻¹. Subsequent heating to 1250 °C produced α-alumina while preserving
    the monolithic shape and continuity of the skeletal framework; however, the hollow
    structure collapsed, and the surface area decreased significantly. Optical measurements
    showed that aluminum hydroxide and α-alumina monoliths both exhibited high total
    diffuse reflectance across the ultraviolet–visible–near-infrared (UV–Vis–NIR)
    range (400–1200 nm), comparable to Spectralon. The α-alumina retained over 90%
    reflectance up to 2500 nm and demonstrated excellent thermal stability. These
    results suggest that the fabricated monoliths could be used as diffuse reflectance
    reference materials.
  description_type: abstract
  lang: und
- description: 金属塩前駆体を用いたゾル－ゲル反応により、連続的な中空骨格を有する水酸化アルミニウムのモノリス型多孔体体を作製した。プロトン捕捉剤として機能するプロピレンオキシドの濃度を調整することで、直径数cmの亀裂のない試料を得た。走査型電子顕微鏡観察により、相互接続されたナノプレートレット殻からなる三次元多孔質ネットワークが明らかになった。調製した試料は、BET比表面積
    429 m² g⁻¹を示した。500 °Cでの焼成により、中空構造と314 m² g⁻¹の高い比表面積を維持したまま、骨格がγ-アルミナへ変換された。その後1250
    °Cまで加熱するとα-アルミナが形成され、モノリス形状と骨格構造の連続性は保持されたが、中空構造は崩壊し比表面積は大幅に減少した。光学測定により、水酸化アルミニウムおよびα-アルミナのモノリスは、紫外－可視－近赤外領域（波長400–1200
    nm）にわたって、スペクトラロンと同等の高い全拡散反射率を示すことが明らかになった。α-アルミナは2500 nmまで90%以上の反射率を維持し、優れた熱安定性を示した。この研究で得られたモノリス体は拡散反射率標準物質としての応用性が示唆される。
  description_type: abstract
  lang: en

## Creator

- name: Gen Hayase
  role: author
  orcid: https://orcid.org/0000-0003-1970-6129
  organization: National Institute for Materials Science

## Contact agent



## Publisher

organization: Wiley

## Managing organization



## Keyword

- subject: alumina
  schema: not_defined
- subject: aluminum hydroxide
  schema: not_defined
- subject: optical materials
  schema: not_defined
- subject: optical properties
  schema: not_defined
- subject: sol‒gel
  schema: not_defined
- subject: porous materials
  schema: not_defined
- subject: porous monoliths
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Journal of the American Ceramic Society
  issn: '15512916'
  volume: '109'
  start_page: 1
  article_number: e70276

## Conference



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## Specimen



## Chemical composition



## Structure for specimen



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## Fileset

- id: 4ff9434f-aa96-46c0-bbcc-a94fbc4c504d
  filename: Journal of the American Ceramic Society - 2025 - Hayase - Hollow skeletal
    macroporous aluminum hydroxide monoliths and.pdf
  content_type: application/pdf
  size: 1440311
  md5: 58070efc2289ab856b850a2e1ce37509

## Thumbnail

fileset_id: 4ff9434f-aa96-46c0-bbcc-a94fbc4c504d
filename: Journal of the American Ceramic Society - 2025 - Hayase - Hollow skeletal
  macroporous aluminum hydroxide monoliths and.pdf