Water Adsorption Property of Hierarchically Nanoporous Detonation Nanodiamonds
| Autor: | Isamu Moriguchi, Jerzy Włoch, Toshio Sakai, Marek Wiśniewski, Piotr Kowalczyk, Ryusuke Futamura, Elda-Zoraida Piña-Salazar, Katsumi Kaneko, Eiji Osawa, Koki Urita, Fernando Vallejos-Burgos, Takuya Hayashi, Artur P. Terzyk |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Nanoporous Detonation Nanotechnology 02 engineering and technology Surfaces and Interfaces 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Adsorption Chemical engineering Electrochemistry Particle General Materials Science Crystallite 0210 nano-technology Nanodiamond Mesoporous material Spectroscopy Water vapor |
| Zdroj: | Langmuir : the ACS journal of surfaces and colloids. 33(42) |
| ISSN: | 1520-5827 |
| Popis: | The detonation nanodiamonds form the aggregate having interparticle voids, giving a marked hygroscopic property. As the relationship between pore structure and water adsorption of aggregated nanodiamonds is not well understood yet, adsorption isotherms of N2 at 77 K and of water vapor at 298 K of the well-characterized aggregated nanodiamonds were measured. HR-TEM and X-ray diffraction showed that the nanodiamonds were highly crystalline and their average crystallite size was 4.5 nm. The presence of the graphitic layers on the nanodiamond particle surface was confirmed by the EELS examination. The pore size distribution analysis showed that nanodiamonds had a few ultramicropores with predominant mesopores of 4.5 nm in average size. The water vapor adsorption isotherm of IUPAC Type V indicates the hydrophobicity of the nanodiamond aggregates, with the presence of hydrophilic sites. Then the hygroscopic nature of nanodiamonds should be associated with the surface functionalities of the graphitic shell and the ultramicropores on the mesopore walls. |
| Databáze: | OpenAIRE |
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