Microflow reactor synthesis of palladium nanoparticles stabilized with poly(benzyl ether) dendron ligands |
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Authors: | Kanjiro Torigoe Yohsuke Watanabe Takeshi Endo Kenichi Sakai Hideki Sakai and Masahiko Abe |
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Institution: | (1) Research Institute for Science and Technology, Tokyo University of Science, 2641, Yamazaki, Noda 278-8510, Japan;(2) Department of Pure and Applied Chemistry, Tokyo University of Science, 2641, Yamazaki, Noda 278-8510, Japan |
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Abstract: | A simple glass capillary microflow reactor system has been applied for the synthesis of palladium nanoparticles by thermal
decomposition of palladium acetate (Pd(OAc)2) in diphenyl ether in the presence of poly(benzyl ether) dendron ligands (PBED Gn-NH2, n = 1–3) as a stabilizer. Effect of hydrodynamic parameters (capillary diameter, linear flow rate, volume flow rate, and reaction
temperature) and concentrations (precursor and stabilizer) on the particle size was investigated. The particle size can be
controlled by varying linear flow rate and temperature as well as ligand/precursor concentration ratio. Volume flow rate does
not affect the particle size when the linear flow rate is held constant for different capillary diameters (150–320 μm). Unlike
batch systems, in this microreactor system, smaller particles are produced at low ligand concentrations when the molar ratio
of the ligand to metal precursor ranged from 1 to 5. As another characteristic of the microreactor synthesis, the concentration
of the Pd precursor can be increased (up to 27 mM) with maintaining a constant particle size (3.1 ± 0.2 nm) and a good monodispersity,
while in the batch system a significant increase and broadening in the particle size are observed with increasing precursor
concentration. |
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