Silica-Coated and Bare Akaganeite Nanorods: Structural and Magnetic Properties
Abstract
We report on structural and magnetic properties of uniform silica-coated akaganeite nanorods with length of L similar to 80 +/- 15 nm and diameter D similar to 15 +/- 5 nm as well as silica shell thickness of about 5 nm. Unexpected negative difference between field-cooled (FC) and zero-field-cooled (ZFC) magnetization Delta M = M-FC - M-ZFC LT 0, room temperature ferromagnetism, and exchange bias effect have been found. The nanorods are investigated by X-ray powder diffraction (XRPD), transmission electron microscopy (TEM), and vibrating sample magnetometer (VSM) measurements. The magnetic measurements were also performed on bare akaganeite nanorods in order to discriminate the effects of silica coating on the magnetic properties. The measured coercivity and exchange bias effect of bare beta-FeOOH nanorods are much lower compared with same properties of SiO2"beta-FeOOH nanorods, emphasizing the effect of silica coating on the magnetic properties. These results are discussed considering... the core shell structure of akaganeite nanorods; i.e., the inner part of the akaganeite nanorod has antiferromagnetic ordering, whereas the nanorod surface exhibits some disorder spin state.
Source:
Journal of Physical Chemistry. C, 2015, 119, 24, 13868-13875Funding / projects:
- Magnetic and radionuclide labeled nanostructured materials for medical applications (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45015)
- Serbia-France bilateral project
DOI: 10.1021/acs.jpcc.5b01547
ISSN: 1932-7447
WoS: 000356754900057
Scopus: 2-s2.0-84934931411
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VinčaTY - JOUR AU - Tadić, Marin AU - Milošević, Irena AU - Kralj, Slavko AU - Mbodji, Mamadou AU - Motte, Laurence PY - 2015 UR - https://vinar.vin.bg.ac.rs/handle/123456789/622 AB - We report on structural and magnetic properties of uniform silica-coated akaganeite nanorods with length of L similar to 80 +/- 15 nm and diameter D similar to 15 +/- 5 nm as well as silica shell thickness of about 5 nm. Unexpected negative difference between field-cooled (FC) and zero-field-cooled (ZFC) magnetization Delta M = M-FC - M-ZFC LT 0, room temperature ferromagnetism, and exchange bias effect have been found. The nanorods are investigated by X-ray powder diffraction (XRPD), transmission electron microscopy (TEM), and vibrating sample magnetometer (VSM) measurements. The magnetic measurements were also performed on bare akaganeite nanorods in order to discriminate the effects of silica coating on the magnetic properties. The measured coercivity and exchange bias effect of bare beta-FeOOH nanorods are much lower compared with same properties of SiO2"beta-FeOOH nanorods, emphasizing the effect of silica coating on the magnetic properties. These results are discussed considering the core shell structure of akaganeite nanorods; i.e., the inner part of the akaganeite nanorod has antiferromagnetic ordering, whereas the nanorod surface exhibits some disorder spin state. T2 - Journal of Physical Chemistry. C T1 - Silica-Coated and Bare Akaganeite Nanorods: Structural and Magnetic Properties VL - 119 IS - 24 SP - 13868 EP - 13875 DO - 10.1021/acs.jpcc.5b01547 ER -
@article{ author = "Tadić, Marin and Milošević, Irena and Kralj, Slavko and Mbodji, Mamadou and Motte, Laurence", year = "2015", abstract = "We report on structural and magnetic properties of uniform silica-coated akaganeite nanorods with length of L similar to 80 +/- 15 nm and diameter D similar to 15 +/- 5 nm as well as silica shell thickness of about 5 nm. Unexpected negative difference between field-cooled (FC) and zero-field-cooled (ZFC) magnetization Delta M = M-FC - M-ZFC LT 0, room temperature ferromagnetism, and exchange bias effect have been found. The nanorods are investigated by X-ray powder diffraction (XRPD), transmission electron microscopy (TEM), and vibrating sample magnetometer (VSM) measurements. The magnetic measurements were also performed on bare akaganeite nanorods in order to discriminate the effects of silica coating on the magnetic properties. The measured coercivity and exchange bias effect of bare beta-FeOOH nanorods are much lower compared with same properties of SiO2"beta-FeOOH nanorods, emphasizing the effect of silica coating on the magnetic properties. These results are discussed considering the core shell structure of akaganeite nanorods; i.e., the inner part of the akaganeite nanorod has antiferromagnetic ordering, whereas the nanorod surface exhibits some disorder spin state.", journal = "Journal of Physical Chemistry. C", title = "Silica-Coated and Bare Akaganeite Nanorods: Structural and Magnetic Properties", volume = "119", number = "24", pages = "13868-13875", doi = "10.1021/acs.jpcc.5b01547" }
Tadić, M., Milošević, I., Kralj, S., Mbodji, M.,& Motte, L.. (2015). Silica-Coated and Bare Akaganeite Nanorods: Structural and Magnetic Properties. in Journal of Physical Chemistry. C, 119(24), 13868-13875. https://doi.org/10.1021/acs.jpcc.5b01547
Tadić M, Milošević I, Kralj S, Mbodji M, Motte L. Silica-Coated and Bare Akaganeite Nanorods: Structural and Magnetic Properties. in Journal of Physical Chemistry. C. 2015;119(24):13868-13875. doi:10.1021/acs.jpcc.5b01547 .
Tadić, Marin, Milošević, Irena, Kralj, Slavko, Mbodji, Mamadou, Motte, Laurence, "Silica-Coated and Bare Akaganeite Nanorods: Structural and Magnetic Properties" in Journal of Physical Chemistry. C, 119, no. 24 (2015):13868-13875, https://doi.org/10.1021/acs.jpcc.5b01547 . .