Sonochemical Approach to the Synthesis of Fe3O4@SiO2 Core−Shell Nanoparticles with Tunable Properties | Zendy

AnneLaure Morel | Zendy; Sergei I. Nikitenko | Zendy; Karine Gionnet | Zendy; Alain Wattiaux | Zendy; Joséphine LaiKeeHim | Zendy; Christine Labrugère | Zendy; Bernard Chevalier | Zendy; Gérard Déléris | Zendy; Cyril Petibois | Zendy; Alain Brisson | Zendy; M. Simonoff | Zendy

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Sonochemical Approach to the Synthesis of Fe₃O₄@SiO₂ Core−Shell Nanoparticles with Tunable Properties

Author(s) -

AnneLaure Morel,

Sergei I. Nikitenko,

Karine Gionnet,

Alain Wattiaux,

Joséphine LaiKeeHim,

Christine Labrugère,

Bernard Chevalier,

Gérard Déléris,

Cyril Petibois,

Alain Brisson,

M. Simonoff

Publication year - 2008

Publication title -

acs nano

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.554

H-Index - 382

eISSN - 1936-086X

pISSN - 1936-0851

DOI - 10.1021/nn800091q

Subject(s) - tetraethyl orthosilicate , materials science , nanoparticle , coprecipitation , sonochemistry , dispersity , superparamagnetism , magnetite , chemical engineering , aqueous solution , oxidizing agent , particle size , analytical chemistry (journal) , nanotechnology , magnetization , chemistry , metallurgy , magnetic field , organic chemistry , physics , quantum mechanics , polymer chemistry , engineering

In this study, we report a rapid sonochemical synthesis of monodisperse nonaggregated Fe(3)O(4)@SiO(2) magnetic nanoparticles (NPs). We found that coprecipitation of Fe(II) and Fe(III) in aqueous solutions under the effect of power ultrasound yields smaller Fe(3)O(4) NPs with a narrow size distribution (4-8 nm) compared to the silent reaction. Moreover, the coating of Fe(3)O(4) NPs with silica using an alkaline hydrolysis of tetraethyl orthosilicate in ethanol-water mixture is accelerated many-fold in the presence of a 20 kHz ultrasonic field. The thickness of the silica shell can be easily controlled in the range of several nanometers during sonication. Mossbauer spectra revealed that nonsuperparamagnetic behavior of obtained core-shell NPs is mostly related to the dipole-dipole interactions of magnetic cores and not to the particle size effect. Core-shell Fe(3)O(4)@SiO(2) NPs prepared with sonochemistry exhibit a higher magnetization value than that for NPs obtained under silent conditions owing to better control of the deposited silica quantities as well as to the high speed of sonochemical coating, which prevents the magnetite from oxidizing.

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