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Effect of Tetramethylammonium Hydroxide on Nucleation, Surface Modification and Growth of Magnetic Nanoparticles
Joint Authors
Valente, M. A.
Andrade, Ângela L.
Fabris, José D.
Ardisson, José D.
Pina, Sandra
Source
Issue
Vol. 2012, Issue 2012 (31 Dec. 2012), pp.1-10, 10 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-08-01
Country of Publication
Egypt
No. of Pages
10
Main Subjects
Abstract EN
Nanoparticles of magnetite (Fe3O4) were obtained by reacting ferric chloride with sodium sulphite, through the reduction-precipitation method.
The effects of adding tetramethylammonium hydroxide (TMAOH) during or after the precipitation of the iron oxide were studied in an attempt to obtain well-dispersed magnetite nanoparticles.
Accordingly, the following experimental conditions were tested: (i) precipitation in absence of TMAOH (sample Mt), (ii) the same as (i) after peptizing with TMAOH (Mt1), (iii) TMAOH added to the reaction mixture during the precipitation of magnetite (Mt2).
Analyses with transmission electron microscopy (TEM), X-ray diffraction, Mössbauer spectroscopy, attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), zeta potential, and magnetization measurements up to 2.5 T revealed that magnetite was normally formed also in the medium containing TMAOH.
The degree of particles agglomeration was monitored with laser diffraction and technique and inspection of TEM images.
The relative contributions of Néel and Brownian relaxations on the magnetic heat dissipation were studied by investigating the ability of suspensions of these magnetite nanoparticles to release heat in aqueous and in hydrogel media.
Based on ATR-FTIR and zeta potential data, it is suggested that the surfaces of the synthesized magnetite particles treated with TMAOH become coated with (CH3)4N+ cations.
American Psychological Association (APA)
Andrade, Ângela L.& Fabris, José D.& Ardisson, José D.& Valente, M. A.& Pina, Sandra. 2012. Effect of Tetramethylammonium Hydroxide on Nucleation, Surface Modification and Growth of Magnetic Nanoparticles. Journal of Nanomaterials،Vol. 2012, no. 2012, pp.1-10.
https://search.emarefa.net/detail/BIM-997719
Modern Language Association (MLA)
Andrade, Ângela L.…[et al.]. Effect of Tetramethylammonium Hydroxide on Nucleation, Surface Modification and Growth of Magnetic Nanoparticles. Journal of Nanomaterials No. 2012 (2012), pp.1-10.
https://search.emarefa.net/detail/BIM-997719
American Medical Association (AMA)
Andrade, Ângela L.& Fabris, José D.& Ardisson, José D.& Valente, M. A.& Pina, Sandra. Effect of Tetramethylammonium Hydroxide on Nucleation, Surface Modification and Growth of Magnetic Nanoparticles. Journal of Nanomaterials. 2012. Vol. 2012, no. 2012, pp.1-10.
https://search.emarefa.net/detail/BIM-997719
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-997719