Title
One-step chemical vapor deposition synthesis of magnetic CNT-hercynite (FeAl2O4) hybrids with good aqueous colloidal stability
Date Issued
01 September 2013
Access level
metadata only access
Resource Type
journal article
Author(s)
Instituto de Química Física de Los Materiales, Medio Ambiente y Energía
Abstract
A multiwall carbon nanotube (MWCNT)/hercynite (FeAl2O 4) hybrid nanomaterial was synthesized by one-step chemical vapor deposition (CVD) using acetylene as precursor and FeOx-AlOOH xerogel as catalyst. The hybrid material was composing by hercynite nanoparticles (diameter 10-50 nm) intimately attached to the walls of the MWCNTs. The diameter of the MWCNTs was related to particle size of the catalyst. The hybrid nanomaterial exhibited a characteristic magnetic behavior that can be considered as a combination of superparamagnetism and ferromagnetism, with a saturation magnetization of 5.7 emu/g at an applied field of 18 kOe and a coercivity of 520 Oe. The hybrid displayed a relatively low pHZPC (approx. 3.2) and formed very stable aqueous suspensions at pH 5.5. Controlled oxidation of the hybrid generated oxidized functional groups, as -OH and -COOH, and promoted the transformation of hercynite to hematite. Due to the high dispersibility of the hybrid in water, it presents an interesting potential as nanofiller for hydrophilic polymers. © 2013 Elsevier Ltd. All rights reserved.
Start page
515
End page
524
Volume
61
Language
English
OCDE Knowledge area
Nano-tecnología
Ingeniería de materiales
Scopus EID
2-s2.0-84879694901
Source
Carbon
ISSN of the container
0008-6223
Sponsor(s)
The authors wish to acknowledge the support and collaboration of the following organizations: UBA (UBACYT Nos. 20020100100350 and 20020090100297) and CONICET PIP 2010-2012, PIP 11220090100699. The research leading to these results has received funding from the European Community’s Seventh Framework Program (FP7/2007–2013) under Grant Agreement No. 213939.
Sources of information:
Directorio de Producción Científica
Scopus