Highly crystalline superparamagnetic iron oxide nanoparticles (SPION) in a silica matrix
Нема приказа
Аутори
Tadić, MarinKusigerski, Vladan
Marković, Dragana
Panjan, Matjaž
Milošević, Irena
Spasojević, Vojislav
Чланак у часопису
Метаподаци
Приказ свих података о документуАпстракт
We report on magnetic properties of iron oxide nanoparticles in a silica matrix synthesized by the sol-gel method. The sample is characterized by using X-ray powder diffractometer (XRPD), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX) and superconducting quantum interference device (SQUID) magnetometer. TEM reveals iron oxide nanoparticles (maghemite/magnetite) of small sizes of about 4 nm, narrow size distribution and no particle agglomeration. The SQUID measurements show low blocking temperature T-B = 6 K and superparamagnetic behavior above 30 K. Obtained saturation magnetization M-S = 61.1 emu/g is very high, among the highest values for iron oxides of particle size below 5 nm. The field-cooled hysteresis measurements do not show displacement of the hysteresis loop thus indicating an absence of exchange bias, whereas AC susceptibility reveals non-interacting nanoparticles. The values of K-eff and K-S (effective and surface anisotropy constants) o...btained in this work are smaller than those reported in the literature for systems where shells disorder spin structure (surface effects) is observed. These results point to highly crystalline iron oxide nanoparticles with a low amount of internal defects and small surface disorder shell thickness which is uncommon for nanoparticles of this size. Superparamagnetic iron oxide nanoparticles (SPION) with such properties are convenient for the biomedical applications in targeted diagnostics and drug delivery. (C) 2012 Elsevier B. V. All rights reserved.
Кључне речи:
Superparamagnetism / Iron oxides / Nanostructures / Magnetic materials / Sol-gel synthesis / Magnetic measurementsИзвор:
Journal of Alloys and Compounds, 2012, 525, 28-33Финансирање / пројекти:
- Магнетни и радионуклидима обележени наноструктурни материјали за примене у медицини (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45015)
DOI: 10.1016/j.jallcom.2012.02.056
ISSN: 0925-8388
WoS: 000302574800006
Scopus: 2-s2.0-84857951335
Колекције
Институција/група
VinčaTY - JOUR AU - Tadić, Marin AU - Kusigerski, Vladan AU - Marković, Dragana AU - Panjan, Matjaž AU - Milošević, Irena AU - Spasojević, Vojislav PY - 2012 UR - https://vinar.vin.bg.ac.rs/handle/123456789/4784 AB - We report on magnetic properties of iron oxide nanoparticles in a silica matrix synthesized by the sol-gel method. The sample is characterized by using X-ray powder diffractometer (XRPD), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX) and superconducting quantum interference device (SQUID) magnetometer. TEM reveals iron oxide nanoparticles (maghemite/magnetite) of small sizes of about 4 nm, narrow size distribution and no particle agglomeration. The SQUID measurements show low blocking temperature T-B = 6 K and superparamagnetic behavior above 30 K. Obtained saturation magnetization M-S = 61.1 emu/g is very high, among the highest values for iron oxides of particle size below 5 nm. The field-cooled hysteresis measurements do not show displacement of the hysteresis loop thus indicating an absence of exchange bias, whereas AC susceptibility reveals non-interacting nanoparticles. The values of K-eff and K-S (effective and surface anisotropy constants) obtained in this work are smaller than those reported in the literature for systems where shells disorder spin structure (surface effects) is observed. These results point to highly crystalline iron oxide nanoparticles with a low amount of internal defects and small surface disorder shell thickness which is uncommon for nanoparticles of this size. Superparamagnetic iron oxide nanoparticles (SPION) with such properties are convenient for the biomedical applications in targeted diagnostics and drug delivery. (C) 2012 Elsevier B. V. All rights reserved. T2 - Journal of Alloys and Compounds T1 - Highly crystalline superparamagnetic iron oxide nanoparticles (SPION) in a silica matrix VL - 525 SP - 28 EP - 33 DO - 10.1016/j.jallcom.2012.02.056 ER -
@article{ author = "Tadić, Marin and Kusigerski, Vladan and Marković, Dragana and Panjan, Matjaž and Milošević, Irena and Spasojević, Vojislav", year = "2012", abstract = "We report on magnetic properties of iron oxide nanoparticles in a silica matrix synthesized by the sol-gel method. The sample is characterized by using X-ray powder diffractometer (XRPD), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX) and superconducting quantum interference device (SQUID) magnetometer. TEM reveals iron oxide nanoparticles (maghemite/magnetite) of small sizes of about 4 nm, narrow size distribution and no particle agglomeration. The SQUID measurements show low blocking temperature T-B = 6 K and superparamagnetic behavior above 30 K. Obtained saturation magnetization M-S = 61.1 emu/g is very high, among the highest values for iron oxides of particle size below 5 nm. The field-cooled hysteresis measurements do not show displacement of the hysteresis loop thus indicating an absence of exchange bias, whereas AC susceptibility reveals non-interacting nanoparticles. The values of K-eff and K-S (effective and surface anisotropy constants) obtained in this work are smaller than those reported in the literature for systems where shells disorder spin structure (surface effects) is observed. These results point to highly crystalline iron oxide nanoparticles with a low amount of internal defects and small surface disorder shell thickness which is uncommon for nanoparticles of this size. Superparamagnetic iron oxide nanoparticles (SPION) with such properties are convenient for the biomedical applications in targeted diagnostics and drug delivery. (C) 2012 Elsevier B. V. All rights reserved.", journal = "Journal of Alloys and Compounds", title = "Highly crystalline superparamagnetic iron oxide nanoparticles (SPION) in a silica matrix", volume = "525", pages = "28-33", doi = "10.1016/j.jallcom.2012.02.056" }
Tadić, M., Kusigerski, V., Marković, D., Panjan, M., Milošević, I.,& Spasojević, V.. (2012). Highly crystalline superparamagnetic iron oxide nanoparticles (SPION) in a silica matrix. in Journal of Alloys and Compounds, 525, 28-33. https://doi.org/10.1016/j.jallcom.2012.02.056
Tadić M, Kusigerski V, Marković D, Panjan M, Milošević I, Spasojević V. Highly crystalline superparamagnetic iron oxide nanoparticles (SPION) in a silica matrix. in Journal of Alloys and Compounds. 2012;525:28-33. doi:10.1016/j.jallcom.2012.02.056 .
Tadić, Marin, Kusigerski, Vladan, Marković, Dragana, Panjan, Matjaž, Milošević, Irena, Spasojević, Vojislav, "Highly crystalline superparamagnetic iron oxide nanoparticles (SPION) in a silica matrix" in Journal of Alloys and Compounds, 525 (2012):28-33, https://doi.org/10.1016/j.jallcom.2012.02.056 . .