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Re‐Dispersible 1D and 2D Nanoparticle Solid Powders without any Surfactant
Author(s) -
Wang Dexiu,
Li Jinyang,
Zhang Jinming,
Yu Jian,
Zhang Jun
Publication year - 2019
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.201800399
Subject(s) - materials science , nanoparticle , supercritical fluid , pulmonary surfactant , chemical engineering , nanotechnology , montmorillonite , graphene , composite material , organic chemistry , chemistry , engineering
Nanoparticles possess unique size‐dependent physical and chemical properties and hold considerable interest as ideal, defect‐free building blocks for nanostructured materials. However, due to irreversible and intrinsic self‐aggregation, it is challenging to obtain dried nanoparticle powders with good redispersibility. In this work, we propose a general method to increase the dispersibility of typical 1D and 2D nanoparticles, including cellulose nanowhiskers, graphene, Laponite and montmorillonite, by combining sol‐gel transitions and supercritical CO 2 drying. In the resulting dried powders, the nanoparticles adopt a non‐full‐contact mode and maintain a loose packing structure formed during the gelation process; thus, they can be perfectly redispersed in water and some organic solvents under mild conditions. Such a promising strategy, without using a surfactant, deliberate surface‐modification and high energy consumption, provides a practical solution to the transportation, storage and large‐scale industrial applications of nanoparticles.