期刊
JOURNAL OF MOLECULAR LIQUIDS
卷 311, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.molliq.2020.113255
关键词
Ionic liquids; Surfactant/ionic liquid hybrid systems; Palladium nanoparticles; Chemical reduction synthesis; In situ SAXS
资金
- Photon Factory Advisory Committee (PAC) [2011G508, 2013G533, 2015G521, 2017G508]
- Aichi Synchrotron Radiation Center, Aichi Science & Technology Foundation, Aichi, Japan [201905102]
- Kyoto University microstructural characterization platform (KUMCP) as a program of Nanotechnology Platform of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [A-16-KT-0017, A-19-KT-0016]
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
Metal nanoparticles of palladium(Pd) were synthesized by the chemical reduction of palladium acetylacetonate (Pd (acac)(2)) dissolved in room-temperature ionic liquids (ILs) containing various nonionic Brij series surfactants (such as Brij-30, Brij-52, Brij-56, Brij-58, Brij-35, and Brij-700) and TX-100. The obtained self-assembled structure of Pd nanoparticles in the surfactant/IL hybrid systems without any cosurfactant/cosolvent was investigated using in situ small-angle X-ray scattering measurements and cryo transmission electron microscopy observations. Size control of Pd nanoparticles was accomplished by simply adjusting the reaction temperature to around 433 K and choosing the surfactant. Brij-58 and Brij-35 were the most appropriate of our experimental conditions for the formation of a stable surfactant/IL hybrid system containing Pd nanoparticles. The most efficient method to regulate Pd nanoparticle size was a temperature-controlled gradual synthesis whereby the reaction temperature for the reduction of Pd (II) ions was increased stepwise from 333 K to 433 K over approximately 60 min. Furthermore, the detailed formation mechanisms of the self-assembled structure of Pd nanoparticles in surfactant/IL hybrid systems were shown using in situ and time-resolved small-angle X-ray scattering measurements. (C) 2020 Elsevier B.V. All rights reserved.
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