Enhanced Magnetic Behavior of Cobalt Nano-Rods Elaborated by the Polyol Process Assisted with an External Magnetic Field
Cobalt nano-rods with the hexagonal close-packed (hcp) structure were prepared by reduction of the long-chain carboxylate Co (II) precursor in polyol. The application of an external magnetic field (<i>µ</i><sub>0</sub><i>H</i> = 1.25 T) during the nucleat...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-02-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/10/2/334 |
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| author | Mohamed Ali Bousnina Amel Dakhlaoui-Omrani Frédéric Schoenstein Yaghoub Soumare Aliou Hamady Barry Jean-Yves Piquemal Guillaume Viau Silvana Mercone Noureddine Jouini |
| author_facet | Mohamed Ali Bousnina Amel Dakhlaoui-Omrani Frédéric Schoenstein Yaghoub Soumare Aliou Hamady Barry Jean-Yves Piquemal Guillaume Viau Silvana Mercone Noureddine Jouini |
| author_sort | Mohamed Ali Bousnina |
| collection | DOAJ |
| description | Cobalt nano-rods with the hexagonal close-packed (hcp) structure were prepared by reduction of the long-chain carboxylate Co (II) precursor in polyol. The application of an external magnetic field (<i>µ</i><sub>0</sub><i>H</i> = 1.25 T) during the nucleation and growth steps resulted in a noticeable modification of the mean aspect ratio (length/diameter) of the particles. The particle morphology was also modified as the nano-rods did not exhibit conical heads at their extremities anymore, which are observed for particles prepared without application of an external magnetic field. Besides, the stacking faults density along the <i>c</i> axis of the hcp structure in the cobalt nano-rods has been found to decrease with the increase in the applied magnetic field. The coercive field of randomly oriented nano-rods increased with the aspect ratio, showing the highest value (i.e., 5.8 kOe at 300 K) for the cobalt nano-rods obtained under the highest applied magnetic field. For partially oriented Co nano-rods in toluene solution, the magnetic properties were significantly enhanced with a coercive field of 7.2 kOe at 140 K, while the magnetization saturation reached 92% of the bulk. The <i>M<sub>R</sub>/M<sub>S</sub></i> value was about 0.8, indicating a good orientation of the anisotropic particles relative to each other, making them suitable for the preparation of permanent magnets via a bottom-up approach. |
| first_indexed | 2024-12-13T20:37:06Z |
| format | Article |
| id | doaj.art-5166eb957fdf4759b7b0cfee19650c10 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-12-13T20:37:06Z |
| publishDate | 2020-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-5166eb957fdf4759b7b0cfee19650c102022-12-21T23:32:15ZengMDPI AGNanomaterials2079-49912020-02-0110233410.3390/nano10020334nano10020334Enhanced Magnetic Behavior of Cobalt Nano-Rods Elaborated by the Polyol Process Assisted with an External Magnetic FieldMohamed Ali Bousnina0Amel Dakhlaoui-Omrani1Frédéric Schoenstein2Yaghoub Soumare3Aliou Hamady Barry4Jean-Yves Piquemal5Guillaume Viau6Silvana Mercone7Noureddine Jouini8Laboratoire des Sciences des Procédés et des Matériaux, CNRS, UPR 3407, Université Sorbonne Paris Nord, 99 Avenue J.B. Clément, F-93430 Villetaneuse, FranceLaboratoire des Sciences des Procédés et des Matériaux, CNRS, UPR 3407, Université Sorbonne Paris Nord, 99 Avenue J.B. Clément, F-93430 Villetaneuse, FranceLaboratoire des Sciences des Procédés et des Matériaux, CNRS, UPR 3407, Université Sorbonne Paris Nord, 99 Avenue J.B. Clément, F-93430 Villetaneuse, FranceLaboratoire des Sciences des Procédés et des Matériaux, CNRS, UPR 3407, Université Sorbonne Paris Nord, 99 Avenue J.B. Clément, F-93430 Villetaneuse, FranceLaboratoire des Sciences des Procédés et des Matériaux, CNRS, UPR 3407, Université Sorbonne Paris Nord, 99 Avenue J.B. Clément, F-93430 Villetaneuse, FranceLaboratoire Interfaces Traitements Organisation et Dynamique des Systèmes, CNRS, UMR 7086, Université de Paris, 15 rue J.-A. de Baïf, F-75013 Paris, FranceLaboratoire de Physique et Chimie des Nano-objets, CNRS, INSA, UPS, Université de Toulouse, 135 avenue de Rangueil, F-31077 Toulouse CEDEX 4, FranceLaboratoire des Sciences des Procédés et des Matériaux, CNRS, UPR 3407, Université Sorbonne Paris Nord, 99 Avenue J.B. Clément, F-93430 Villetaneuse, FranceLaboratoire des Sciences des Procédés et des Matériaux, CNRS, UPR 3407, Université Sorbonne Paris Nord, 99 Avenue J.B. Clément, F-93430 Villetaneuse, FranceCobalt nano-rods with the hexagonal close-packed (hcp) structure were prepared by reduction of the long-chain carboxylate Co (II) precursor in polyol. The application of an external magnetic field (<i>µ</i><sub>0</sub><i>H</i> = 1.25 T) during the nucleation and growth steps resulted in a noticeable modification of the mean aspect ratio (length/diameter) of the particles. The particle morphology was also modified as the nano-rods did not exhibit conical heads at their extremities anymore, which are observed for particles prepared without application of an external magnetic field. Besides, the stacking faults density along the <i>c</i> axis of the hcp structure in the cobalt nano-rods has been found to decrease with the increase in the applied magnetic field. The coercive field of randomly oriented nano-rods increased with the aspect ratio, showing the highest value (i.e., 5.8 kOe at 300 K) for the cobalt nano-rods obtained under the highest applied magnetic field. For partially oriented Co nano-rods in toluene solution, the magnetic properties were significantly enhanced with a coercive field of 7.2 kOe at 140 K, while the magnetization saturation reached 92% of the bulk. The <i>M<sub>R</sub>/M<sub>S</sub></i> value was about 0.8, indicating a good orientation of the anisotropic particles relative to each other, making them suitable for the preparation of permanent magnets via a bottom-up approach.https://www.mdpi.com/2079-4991/10/2/334cobaltnano-rodspolyol processmagnetic fieldferromagnetism |
| spellingShingle | Mohamed Ali Bousnina Amel Dakhlaoui-Omrani Frédéric Schoenstein Yaghoub Soumare Aliou Hamady Barry Jean-Yves Piquemal Guillaume Viau Silvana Mercone Noureddine Jouini Enhanced Magnetic Behavior of Cobalt Nano-Rods Elaborated by the Polyol Process Assisted with an External Magnetic Field Nanomaterials cobalt nano-rods polyol process magnetic field ferromagnetism |
| title | Enhanced Magnetic Behavior of Cobalt Nano-Rods Elaborated by the Polyol Process Assisted with an External Magnetic Field |
| title_full | Enhanced Magnetic Behavior of Cobalt Nano-Rods Elaborated by the Polyol Process Assisted with an External Magnetic Field |
| title_fullStr | Enhanced Magnetic Behavior of Cobalt Nano-Rods Elaborated by the Polyol Process Assisted with an External Magnetic Field |
| title_full_unstemmed | Enhanced Magnetic Behavior of Cobalt Nano-Rods Elaborated by the Polyol Process Assisted with an External Magnetic Field |
| title_short | Enhanced Magnetic Behavior of Cobalt Nano-Rods Elaborated by the Polyol Process Assisted with an External Magnetic Field |
| title_sort | enhanced magnetic behavior of cobalt nano rods elaborated by the polyol process assisted with an external magnetic field |
| topic | cobalt nano-rods polyol process magnetic field ferromagnetism |
| url | https://www.mdpi.com/2079-4991/10/2/334 |
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