title: Continuous synthesis of monodispersed silver nanoparticles using a homogeneous heating microwave reactor system.
abstract: Continuous synthesis of silver nanoparticles based on a polyol process was conducted using a microwave-assisted flow reactor installed in a cylindrical resonance cavity. Silver nitrate (AgNO(3)) and poly(N-vinylpyrrolidone) (PVP) dissolved in ethylene glycol were used respectively as a silver metal precursor and as a capping agent of nanoparticles. Ethylene glycol worked as the solvent and simultaneously as the reductant. Silver nanoparticles of narrow size distributions were synthesized steadily for 5 h, maintaining almost constant yield (>93%) and quality. The reaction was achieved within 2.8 s of residence time, although nanoparticles were not formed under this flow rate by conventional heating. A narrower particle size distribution was realized by the increased flow rate of the reaction solution. Nanoparticles of 9.8 nm average size with a standard deviation of 0.9 nm were synthesized at the rate of 100 ml h(-l).
authors.affiliation: National Institute of Advanced Industrial Science and Technology, AIST, 4-2-1, Nigatake, Miyagino-ku, Sendai, 983-8551, Japan. m.nishioka@aist.go.jp
authors.forename: Masateru
authors.initials: M
authors.lastname: Nishioka
authors.forename: Masato
authors.initials: M
authors.lastname: Miyakawa
authors.forename: Haruki
authors.initials: H
authors.lastname: Kataoka
authors.forename: Hidekazu
authors.initials: H
authors.lastname: Koda
authors.forename: Koichi
authors.initials: K
authors.lastname: Sato
authors.forename: Toshishige M
authors.initials: TM
authors.lastname: Suzuki