S
S. J. Stewart
Researcher at National University of La Plata
Publications - 62
Citations - 1512
S. J. Stewart is an academic researcher from National University of La Plata. The author has contributed to research in topics: Magnetization & Magnetic moment. The author has an hindex of 21, co-authored 61 publications receiving 1352 citations. Previous affiliations of S. J. Stewart include National Scientific and Technical Research Council & Open University.
Papers
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Nitrogen-containing TiO2 photocatalysts. Part 2. Photocatalytic behavior under sunlight excitation
TL;DR: In this article, a series of nanosized N-containing TiO2-based materials with Anatase-type structure and synthesized by a microemulsion method were tested in the photocatalytic degradation of methylcyclohexene, a representative example of volatile organic compound (VOC) present in urban atmospheres.
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Cationic exchange in nanosized Zn Fe 2 O 4 spinel revealed by experimental and simulated near-edge absorption structure
S. J. Stewart,Santiago J. A. Figueroa,Santiago J. A. Figueroa,J. M. Ramallo Lopez,J. M. Ramallo Lopez,Sergio Gustavo Marchetti,Jose Fernando Bengoa,R. J. Prado,Félix G. Requejo,Félix G. Requejo +9 more
TL;DR: In this article, the nonequilibrium cation site occupancy in nanosized zinc ferrites with different degree of inversion was investigated using X-ray absorption near edge spectroscopy (XANES).
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Oxygen-vacancy-induced local ferromagnetism as a driving mechanism in enhancing the magnetic response of ferrites
C.E. Rodríguez Torres,G. A. Pasquevich,P. Mendoza Zélis,Federico Golmar,Silvia P. Heluani,Sanjeev K. Nayak,Waheed A. Adeagbo,Wolfram Hergert,Martin Hoffmann,Martin Hoffmann,Arthur Ernst,Pablo Esquinazi,S. J. Stewart +12 more
TL;DR: In this paper, the relevance of oxygen vacancies in the formation of local ferromagnetic coupling between Fe ions at octahedral sites in zinc ferrites was investigated, which gives rise to a ferrimagnetic ordering with the Curie temperatures above room temperature in an otherwise antiferromagnetic compound.
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Alternative low-cost approach to the synthesis of magnetic iron oxide nanoparticles by thermal decomposition of organic precursors.
I O Perez De Berti,M.V. Cagnoli,Gina Pecchi,J L Alessandrini,S. J. Stewart,Jose Fernando Bengoa,Sergio Gustavo Marchetti +6 more
TL;DR: The results indicate that the distance between two neighbour NPs is insufficient to inhibit interparticle magnetic interactions when the average diameter is 8.8 nm, and the good quality of the NPs open a new perspective for future technological applications.
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Influence of N-doping on the structure and electronic properties of titania nanoparticle photocatalysts.
TL;DR: The influence of N-doping on titania nanoparticles and their structure, electronics and photocatalytic activity is discussed and it is observed that those samples with a larger fraction of Ti in a fivefold coordination also present a modified Ti environment at the medium-range scale.