Unusual hygroscopic nature of nanodiamonds in comparison with well-known porous materials
| Autor: | Elda-Zoraida Piña-Salazar, Toshio Sakai, Katsumi Kaneko, Eiji Ōsawa, Ryusuke Futamura |
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| Rok vydání: | 2018 |
| Předmět: |
Absorption of water
Materials science 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials chemistry.chemical_compound Colloid and Surface Chemistry Adsorption Montmorillonite Chemical engineering chemistry Particle 0210 nano-technology Nanodiamond Mesoporous material Porous medium Porosity |
| Zdroj: | Journal of colloid and interface science. 549 |
| ISSN: | 1095-7103 |
| Popis: | Nanodiamond aggregates have interparticle pores of 4.5 nm on average, exhibiting porous nature involved in their water storage. This work studies the hygroscopic nature of porous nanodiamond aggregates by water absorption based on liquid water droplets. Nanodiamond aggregates show hydrophobicity from the water vapor adsorption. Surprisingly, porous nanodiamond aggregates quickly absorb water droplets at the bulk scale. The volume of absorbed liquid water is comparable to that of the water-absorbing clay Montmorillonite and higher than those of zeolites ZSM-5 and molecular sieve 5A. This hygroscopic nature of nanodiamonds is ascribed to the micro- and mesoporous structure of their aggregates and the special core-shell structure of each nanodiamond particle (wrapped by graphene-like carbon). The absorption rate of liquid water in the porous nanodiamonds is influenced by the surface wettability, while the hygroscopic capacity depends mainly on the hierarchical porosity. |
| Databáze: | OpenAIRE |
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