Shell-thickness control of hollow SiO2 nanoparticles through post-treatment using sol−gel technique toward efficient water confinement.

Tarutani Naoki

Honda Yuka

Hamakawa Risa

Uchikoshi Tetsuo

Ishigaki Takamasa

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Hollow structures possess a confinement function, which enables the handling and use of functional liquids. In this study, we focus on the confinement of water in the inner spaces of hollow SiO2 nanoparticles (HSNPs). Water is introduced into the hollow spaces passing through the mesopores of the shells. The introduced water is then confined by thickening the shell through a post-treatment using silicon alkoxides. HSNPs with a variety of shell thicknesses are prepared by tuning the synthetic conditions of the reaction media and the alkoxides. It is found that the amount of water retained in a hollow space is increased with shell thickness. The resultant water–HSNP nanocomposites exhibit effective far-infrared absorption. The facile confinement approach reported in this study will lead to highly functional complex nanocomposites, such as isolated metal nanoparticles–water–silica.

Hollow nanoparticles

Sol−gel reaction

Water confinement

Nanocomposites

eng

Elsevier

© 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/

This is not the published version. Please cite only the published version. この論文は出版社版ではありません。引用の際には出版社版をご確認、ご利用ください。

[ISSN] 1873-4359

[DOI] 10.1016/j.colsurfa.2021.127501

[DOI] https://doi.org/10.1016/j.colsurfa.2021.127501

[NCID] AA10892561