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Simple Surfactant Concentration‐Dependent Shape Control of Polyhedral Fe 3 O 4 Nanoparticles and Their Magnetic Properties
Author(s) -
Ge Wanyin,
Sato Ryota,
Wu HsinLun,
Teranishi Toshiharu
Publication year - 2015
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201500605
Subject(s) - cetylpyridinium chloride , coercivity , pulmonary surfactant , dispersity , nanoparticle , octahedron , magnetization , chemical engineering , ferrofluid , materials science , chloride , alkyl , pyridinium , magnetic nanoparticles , chemistry , crystallography , nanotechnology , organic chemistry , crystal structure , polymer chemistry , physics , quantum mechanics , magnetic field , engineering , condensed matter physics
The shape and size of monodisperse Fe 3 O 4 nanoparticles (NPs) are controlled using a chemical solution synthesis in the presence of the surfactant cetylpyridinium chloride (CPC). Cubic Fe 3 O 4 NPs surrounded by six {100} planes are obtained in the absence of CPC. Increasing the CPC content during synthesis causes the shape of the resulting Fe 3 O 4 NPs to change from cubic to truncated cubic, cuboctahedral, truncated octahedral, and finally octahedral. During this evolution, the predominantly exposed planes of the Fe 3 O 4 NPs vary from {100} to {111}. The shape control results from the synergistic effect of the pyridinium cations, chloride anions, and long‐chain alkyl groups of CPC, which is confirmed by comparison with NPs synthesized in the presence of various related cationic surfactants. The size of the cubic Fe 3 O 4 NPs can be tuned from 50 to 200 nm, by changing the concentration of oleic acid in the reaction solution. The Fe 3 O 4 NPs exhibit shape‐dependent saturation magnetization, remanent magnetization, and coercivity.