Issue 5, 2013
From the journal:

Nanoscale

Ultrafast and continuous synthesis of crystalline ferrite nanoparticles in supercritical ethanol

Oana Pascu,a   Samuel Marre,bc   Cyril Aymonier*bc  and  Anna Roig*a  

* Corresponding authors

a Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra, Spain
E-mail: roig@icmab.es

b CNRS, ICMCB, UPR 9048, F-33600 Pessac, France

c Univ. Bordeaux, ICMCB, UPR 9048, F-33600 Pessac, France
E-mail: aymonier@icmcb-bordeaux.cnrs.fr

Abstract

Magnetic nanoparticles (NPs) are of increasing interest in various industrially relevant products. For these, the development of greener and faster approaches facilitating scaling-up production is of paramount importance. Here, we report a novel, green and potentially scalable approach for the continuous and ultrafast (90 s) synthesis of superparamagnetic ferrite NPs (MnFe2O4, Fe3O4) in supercritical ethanol (scEtOH) at a fairly moderate temperature (260 °C). ScEtOH exhibits numerous advantages such as its production from bio-resources, its lack of toxicity and its relatively low supercritical coordinates (pc = 6.39 MPa and Tc = 243 °C), being therefore appropriate for the development of sustainable technologies. The present study is completed by the investigation of both in situ and ex situ NP surface functionalization. The as-obtained nanoparticles present good crystallinity, sizes below 8 nm, superparamagnetic behavior at room temperature and high saturation magnetization. Moreover, depending on the capping strategy, the ferrite NPs present extended (for in situ coated NPs) or short-term (for ex situ coated NPs) colloidal stability.

Graphical abstract: Ultrafast and continuous synthesis of crystalline ferrite nanoparticles in supercritical ethanol

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Article information

DOI
https://doi.org/10.1039/C3NR33501A
Article type
Paper
Submitted
06 Nov 2012
Accepted
05 Jan 2013
First published
09 Jan 2013

Nanoscale, 2013,5, 2126-2132

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Ultrafast and continuous synthesis of crystalline ferrite nanoparticles in supercritical ethanol

O. Pascu, S. Marre, C. Aymonier and A. Roig, Nanoscale, 2013, 5, 2126 DOI: 10.1039/C3NR33501A

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