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Recovery of Silver Nanoparticles Synthesized in AOT/C 12 E 4 Mixed Reverse Micelles by Antisolvent CO 2
Author(s) -
Zhang Jianling,
Han Buxing,
Liu Juncheng,
Zhang Xiaogang,
He Jun,
Liu Zhimin,
Jiang Tao,
Yang Guanying
Publication year - 2002
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/1521-3765(20020902)8:17<3879::aid-chem3879>3.0.co;2-w
Subject(s) - micelle , dissolution , dispersity , pulmonary surfactant , particle size , nanoparticle , chemical engineering , molar ratio , phase (matter) , silver nanoparticle , critical micelle concentration , chemistry , materials science , chromatography , nuclear chemistry , polymer chemistry , nanotechnology , organic chemistry , aqueous solution , catalysis , engineering
Abstract Silver nanoparticles were synthesized in sodium bis(2‐ethylhexyl)sulfosuccinate (AOT) reverse micelles in isooctane with tetraethylene glycol dodecyl ether (C 12 E 4 ) as a cosurfactant. Recovery of the Ag particles from the reverse micelles by dissolving antisolvent CO 2 in the micellar solution was investigated. All the Ag particles in the reverse micelles could be precipitated by compressed CO 2 at suitable pressures, while the surfactants remained in the isooctane continuous phase, and well‐dispersed Ag nanoparticles were obtained. The effects of operating conditions on the size and size distribution of the Ag particles were investigated. The particle size decreased with decreasing molar ratio ( w ) of water to surfactant. A higher CO 2 pressure in the recovery process favored production of smaller particles. A decrease in the molar ratio of reductant KBH 4 to AgNO 3 resulted in larger Ag particles with higher polydispersity.