Nanostructure and surface activation of mayenite (12CaO·7Al 2 O 3 ) ceramics via femtosecond laser irradiation in solvents
| Autor: | Hirano Minami, Kazuyuki Hirao, Takuya Omura, Taigo Takaishi, Masahiro Shimizu, Heidy Visbal |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Infrared spectroscopy 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Laser Photochemistry 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials law.invention Crystallinity law Specific surface area Femtosecond Surface modification Irradiation Particle size Electrical and Electronic Engineering 0210 nano-technology |
| Zdroj: | Optics & Laser Technology. 92:126-132 |
| ISSN: | 0030-3992 |
| Popis: | Mayenite (12CaO·7Al2O3) is a highly interesting functional material due to the wide variety of its possible future applications. In this study, we used femtosecond laser irradiation in several solvents with varying polarities to increase the specific surface area of 12CaO·7Al2O3 ceramics and reduce their particle size without any structural degradation or loss of crystallinity. We observed that when femtosecond laser irradiation was applied to solvents bearing hydroxyl groups, a smaller particle size was obtained with the particle size decreasing as the polarity of the solvent increased. Using infrared spectroscopy, we confirmed the presence of hydroxyl and carbonyl surface functional groups at the surface of 12CaO·7Al2O3 ceramics after femtosecond laser irradiation. This is attributed to the direct chemical bonds breaking of the solvent via multiphoton ionization and/or tunneling ionization, followed by the Coulomb explosion and the subsequent production of ions that are adsorbed on the surfaces of 12CaO·7Al2O3 ceramics. Femtosecond laser irradiation in polar solvents with hydroxyl groups can reduce the particle size and increase the specific surface area without degradation or loss of crystallinity of 12CaO·7Al2O3 ceramics. Additionally, this method can be used for the surface modification and introduction of functional groups on the 12CaO·7Al2O3 ceramics surface. |
| Databáze: | OpenAIRE |
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