NDLI: Self-assembly of 2D MnO<sub>2</sub> nanosheets into high-purity aerogels with ultralow density

Content Provider	Royal Society of Chemistry (RSC)
Author	Yin, Shengyan Sun, Hang Liu, Zhenning Xu, Kongliang She, Ping Zhu, Xuedong
Copyright Year	2016
Abstract	Self-assembling inorganic nanoparticles (NPs) into macroscopic three dimensional (3D) architectures often requires the assistance of organic components, leaving residual organics in the resultant. In this work, organic-free MnO2 aerogels with ultralow density have been achieved by the self-assembly of two dimensional (2D) MnO2 nanosheets via an ice-templating approach. To the authors' best knowledge, it is the first reported case of constructing a high-purity inorganic aerogel from preformed NPs without using any functionalization or stabilization agents. Moreover, it has been demonstrated that an ultralight MnO2 aerogel with a density as low as ∼0.53 mg cm−3, which is the lightest metal oxide aerogel to date, can be well obtained by such an approach. The successful formation of the aerogel can be attributed to the enhanced van der Waals force between the 2D building blocks that have been more orderly arranged by the squeezing of ice crystals during the freezing process. Hence, this work shows a pioneering example of assembling inorganic NPs into aerogels relying only on the weak interactions between NPs (e.g. van der Waals forces). It has also been demonstrated that the obtained MnO2 aerogel can function as an effective absorbent for toxic reducing gas, owing to its strong oxidation ability and high porosity. The strategy presented herein holds good potential to be applied to the fabrication of other high-purity inorganic aerogels, especially those with 2D building blocks readily available.
Starting Page	1926
Ending Page	1932
Page Count	7
File Format	HTM / HTML PDF
ISSN	20416520
Volume Number	7
Issue Number	3
Journal	Chemical Science
DOI	10.1039/c5sc03217b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Self-assembly Aerogel Ultralight aviation Dimension Porosity Van der Waals force
Content Type	Text
Resource Type	Article
Subject	Chemistry

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