Magnetic properties of novel superparamagnetic iron oxide nanoclusters and their peculiarity under annealing treatment
Апстракт
The aim of this work is to present the magnetic properties of novel superparamagnetic-iNANOvative (TM)vertical bar silica nanoparticle clusters. A TEM analysis showed that these nanoparticle clusters, approximately 80 nm in size, contained an assembly of maghemite nanoparticles in the core and an amorphous silica shell. The maghemite nanoparticles in the core were approximately 10 nm in size, whereas the uniform silica shell was approximately 15-nm thick. The number of magnetic nanoparticles that were densely packed in the core of the single nanocluster was estimated to be approximately 67, resulting in a high magnetic moment for the single nanocluster of m(nc) similar to 1.2 x 10(6) mu(B). This magnetic property of the nanoparticle cluster is advantageous for its easy manipulation using an external magnetic field, for example, in biomedical applications, such as drug delivery, or for magnetic separation in biotechnology. The magnetic properties of the iNANOvative (TM)vertical bar sili...ca nanoparticle clusters were systematically studied, with a special focus on the influence of the magnetic interactions between the nanoparticles in the core. For comparison, the nanoparticle clusters were annealed for 3 h at 300 degrees C in air. The annealing had no influence on the nanoparticles size and phase; however, it had a unique effect on the magnetic properties, i.e., a decrease of the blocking temperature and a weakening of the inter-particle interactions. We believe that this surprising observation is related to the thermal decomposition of the organic surfactant on the surfaces of the nanoparticles at the high annealing temperatures, which resulted in the formation of amorphous carbon inside the nanocluster. (C) 2014 Elsevier B.V. All rights reserved.
Кључне речи:
Maghemite / Surface effects / Superparamagnetism (SPION) / Self-assembly nanoparticles / AC susceptibility / Inter-particle interactionsИзвор:
Applied Surface Science, 2014, 322, 255-264Финансирање / пројекти:
- Магнетни и радионуклидима обележени наноструктурни материјали за примене у медицини (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45015)
- Ministry of Higher Education, Science and Technology of the Republic of Slovenia within the National Research Program
DOI: 10.1016/j.apsusc.2014.09.181
ISSN: 0169-4332; 1873-5584
WoS: 000345508700036
Scopus: 2-s2.0-84913529778
Колекције
Институција/група
VinčaTY - JOUR AU - Tadić, Marin AU - Kralj, Slavko AU - Jagodič, Marko AU - Hanžel, Darko AU - Makovec, Darko PY - 2014 UR - https://vinar.vin.bg.ac.rs/handle/123456789/59 AB - The aim of this work is to present the magnetic properties of novel superparamagnetic-iNANOvative (TM)vertical bar silica nanoparticle clusters. A TEM analysis showed that these nanoparticle clusters, approximately 80 nm in size, contained an assembly of maghemite nanoparticles in the core and an amorphous silica shell. The maghemite nanoparticles in the core were approximately 10 nm in size, whereas the uniform silica shell was approximately 15-nm thick. The number of magnetic nanoparticles that were densely packed in the core of the single nanocluster was estimated to be approximately 67, resulting in a high magnetic moment for the single nanocluster of m(nc) similar to 1.2 x 10(6) mu(B). This magnetic property of the nanoparticle cluster is advantageous for its easy manipulation using an external magnetic field, for example, in biomedical applications, such as drug delivery, or for magnetic separation in biotechnology. The magnetic properties of the iNANOvative (TM)vertical bar silica nanoparticle clusters were systematically studied, with a special focus on the influence of the magnetic interactions between the nanoparticles in the core. For comparison, the nanoparticle clusters were annealed for 3 h at 300 degrees C in air. The annealing had no influence on the nanoparticles size and phase; however, it had a unique effect on the magnetic properties, i.e., a decrease of the blocking temperature and a weakening of the inter-particle interactions. We believe that this surprising observation is related to the thermal decomposition of the organic surfactant on the surfaces of the nanoparticles at the high annealing temperatures, which resulted in the formation of amorphous carbon inside the nanocluster. (C) 2014 Elsevier B.V. All rights reserved. T2 - Applied Surface Science T1 - Magnetic properties of novel superparamagnetic iron oxide nanoclusters and their peculiarity under annealing treatment VL - 322 SP - 255 EP - 264 DO - 10.1016/j.apsusc.2014.09.181 ER -
@article{ author = "Tadić, Marin and Kralj, Slavko and Jagodič, Marko and Hanžel, Darko and Makovec, Darko", year = "2014", abstract = "The aim of this work is to present the magnetic properties of novel superparamagnetic-iNANOvative (TM)vertical bar silica nanoparticle clusters. A TEM analysis showed that these nanoparticle clusters, approximately 80 nm in size, contained an assembly of maghemite nanoparticles in the core and an amorphous silica shell. The maghemite nanoparticles in the core were approximately 10 nm in size, whereas the uniform silica shell was approximately 15-nm thick. The number of magnetic nanoparticles that were densely packed in the core of the single nanocluster was estimated to be approximately 67, resulting in a high magnetic moment for the single nanocluster of m(nc) similar to 1.2 x 10(6) mu(B). This magnetic property of the nanoparticle cluster is advantageous for its easy manipulation using an external magnetic field, for example, in biomedical applications, such as drug delivery, or for magnetic separation in biotechnology. The magnetic properties of the iNANOvative (TM)vertical bar silica nanoparticle clusters were systematically studied, with a special focus on the influence of the magnetic interactions between the nanoparticles in the core. For comparison, the nanoparticle clusters were annealed for 3 h at 300 degrees C in air. The annealing had no influence on the nanoparticles size and phase; however, it had a unique effect on the magnetic properties, i.e., a decrease of the blocking temperature and a weakening of the inter-particle interactions. We believe that this surprising observation is related to the thermal decomposition of the organic surfactant on the surfaces of the nanoparticles at the high annealing temperatures, which resulted in the formation of amorphous carbon inside the nanocluster. (C) 2014 Elsevier B.V. All rights reserved.", journal = "Applied Surface Science", title = "Magnetic properties of novel superparamagnetic iron oxide nanoclusters and their peculiarity under annealing treatment", volume = "322", pages = "255-264", doi = "10.1016/j.apsusc.2014.09.181" }
Tadić, M., Kralj, S., Jagodič, M., Hanžel, D.,& Makovec, D.. (2014). Magnetic properties of novel superparamagnetic iron oxide nanoclusters and their peculiarity under annealing treatment. in Applied Surface Science, 322, 255-264. https://doi.org/10.1016/j.apsusc.2014.09.181
Tadić M, Kralj S, Jagodič M, Hanžel D, Makovec D. Magnetic properties of novel superparamagnetic iron oxide nanoclusters and their peculiarity under annealing treatment. in Applied Surface Science. 2014;322:255-264. doi:10.1016/j.apsusc.2014.09.181 .
Tadić, Marin, Kralj, Slavko, Jagodič, Marko, Hanžel, Darko, Makovec, Darko, "Magnetic properties of novel superparamagnetic iron oxide nanoclusters and their peculiarity under annealing treatment" in Applied Surface Science, 322 (2014):255-264, https://doi.org/10.1016/j.apsusc.2014.09.181 . .