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Pina-Salazar EZ, Urita K, Hayashi T, Futamura R, Vallejos-Burgos F, Włoch J, Kowalczyk P, Wiśniewski M, Sakai T, Moriguchi I, Terzyk AP, Osawa E, Kaneko K. Water Adsorption Property of Hierarchically Nanoporous Detonation Nanodiamonds. Langmuir 2017; 33:11180-11188. [PMID: 28793776 DOI: 10.1021/acs.langmuir.7b02046] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
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.
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Affiliation(s)
| | - Koki Urita
- Division of Chemistry and Materials Science, Graduate School of Engineering, Nagasaki University , Nagasaki 852-8521, Japan
| | | | | | | | - Jerzy Włoch
- Faculty of Chemistry, Synthesis and Modification of Carbon Materials Research Group, Nicolaus Copernicus University in Toruń , Gagarin Street 7, 87-100 Toruń, Poland
| | - Piotr Kowalczyk
- School of Engineering and Information Technology, Murdoch University , Murdoch 6150, WA, Australia
| | - Marek Wiśniewski
- Faculty of Chemistry, Physicochemistry of Carbon Materials Research Group, Nicolaus Copernicus University in Toruń , Gagarin Street 7, 87-100 Toruń, Poland
- INVEST-TECH R&D Center, Plaska Street 32-34, 87-100 Toruń, Poland
| | | | - Isamu Moriguchi
- Division of Chemistry and Materials Science, Graduate School of Engineering, Nagasaki University , Nagasaki 852-8521, Japan
| | - Artur P Terzyk
- Faculty of Chemistry, Physicochemistry of Carbon Materials Research Group, Nicolaus Copernicus University in Toruń , Gagarin Street 7, 87-100 Toruń, Poland
| | - Eiji Osawa
- Nano-Carbon Research Institute, Ltd., Ueda, Nagano 386-8567, Japan
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