Magnetic core–shell structures for magnetic fluid hyperthermia therapy application

2013 ◽  
Vol 37 (11) ◽  
pp. 3784 ◽  
Author(s):  
P. B. Shete ◽  
R. M. Patil ◽  
R. S. Ningthoujam ◽  
S. J. Ghosh ◽  
S. H. Pawar
Keyword(s):  
Magnetic Fluid ◽  
Magnetic Core ◽  
Shell Structures ◽  
Core Shell ◽  
Magnetic Fluid Hyperthermia ◽  
Hyperthermia Therapy

On the in Vitro Hyperthermia of Magnetic Fluid in AC Magnetic Field

2009 ◽  
Author(s):  
Junfeng Jiang ◽  
Ruoyu Hong ◽  
Xiaohui Zhang ◽  
Hongzhong Li
Keyword(s):  
Magnetic Field ◽  
Magnetic Fluid ◽  
Volume Fraction ◽  
Maximum Temperature ◽  
Magnetic Fluid Hyperthermia ◽  
Ac Magnetic Field ◽  
Hyperthermia Therapy ◽  
Good Biocompatibility ◽  
High Chemical Stability

Hyperthermia therapy for cancer has attracted much attention nowadays. The study on the heat transfer in the magnetic fluid and the tumor is crucial for the successful application of magnetic fluid hyperthermia (MFH). Water-based Fe3O4 magnetic fluid is expected to be a most appropriate candidate for MFH due to the good biocompatibility, high saturation magnetization, super-paramagnetization and high chemical stability. In this paper, we explore the heat generation and transfer in magnetic fluid which is placed under an AC magnetic field. It is found that the amplitude and the frequency of alternating magnetic field, particle size and volume fraction have a pronounce influence on maximum temperature of hyperthermia.

scholarly journals Synthesis, characterisation and potential biomedical applications of magnetic core–shell structures: carbon‐, dextran‐, SiO 2 ‐ and ZnO‐coated Fe 3 O 4 nanoparticles

2017 ◽  
Vol 12 (1) ◽  
pp. 78-86 ◽  
Author(s):  
Komail Boustani ◽  
Saber Farjami Shayesteh ◽  
Mojtaba Salouti ◽  
Atefeh Jafari ◽  
Alireza Ahadpour Shal
Keyword(s):  
Biomedical Applications ◽  
Magnetic Core ◽  
Shell Structures ◽  
Core Shell

Heat transfer of PEGylated cobalt ferrite nanofluids for magnetic fluid hyperthermia therapy: In vitro cellular study

2018 ◽  
Vol 462 ◽  
pp. 185-194 ◽  
Author(s):  
Shadie Hatamie ◽  
Benymin Parseh ◽  
Mohammad Mahdi Ahadian ◽  
Fatemeh Naghdabadi ◽  
Reza Saber ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Magnetic Fluid ◽  
Cobalt Ferrite ◽  
Magnetic Fluid Hyperthermia ◽  
Hyperthermia Therapy

scholarly journals Engineering Core-Shell Structures of Magnetic Ferrite Nanoparticles for High Hyperthermia Performance

Nanomaterials ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 991 ◽  
Author(s):  
Mohamed S. A. Darwish ◽  
Hohyeon Kim ◽  
Hwangjae Lee ◽  
Chiseon Ryu ◽  
Jae Young Lee ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Cobalt Ferrite ◽  
Magnetic Core ◽  
Ferrite Nanoparticles ◽  
Shell Structures ◽  
Precipitation Process ◽  
Core Shell ◽  
Heating Efficiency

Magnetic ferrite nanoparticles (MFNs) with high heating efficiency are highly desirable for hyperthermia applications. As conventional MFNs usually show low heating efficiency with a lower specific loss power (SLP), extensive efforts to enhance the SLP of MFNs have been made by varying the particle compositions, sizes, and structures. In this study, we attempted to increase the SLP values by creating core-shell structures of MFNs. Accordingly, first we synthesized three different types of core ferrite nanoparticle of magnetite (mag), cobalt ferrite (cf) and zinc cobalt ferrite (zcf). Secondly, we synthesized eight bi-magnetic core-shell structured MFNs; Fe3O4@CoFe2O4 (mag@cf1, mag@cf2), CoFe2O4@Fe3O4 (cf@mag1, cf@mag2), Fe3O4@ZnCoFe2O4 (mag@zcf1, mag@zcf2), and ZnCoFe2O4@Fe3O4 (zcf@mag1, zcf@mag2), using a modified controlled co-precipitation process. SLP values of the prepared core-shell MFNs were investigated with respect to their compositions and core/shell dimensions while varying the applied magnetic field strength. Hyperthermia properties of the prepared core-shell MFNs were further compared to commercial magnetic nanoparticles under the safe limits of magnetic field parameters (<5 × 109 A/(m·s)). As a result, the highest SLP value (379.2 W/gmetal) was obtained for mag@zcf1, with a magnetic field strength of 50 kA/m and frequency of 97 kHz. On the other hand, the lowest SLP value (1.7 W/gmetal) was obtained for cf@mag1, with a magnetic field strength of 40 kA/m and frequency of 97 kHz. We also found that magnetic properties and thickness of the shell play critical roles in heating efficiency and hyperthermia performance. In conclusion, we successfully enhanced the SLP of MFNs by engineering their compositions and dimensions.

Magnetic Core-Shell to Yolk-Shell Structures in Palladium-Catalyzed Suzuki-Miyaura Reactions: Heterogeneous versus Homogeneous Nature

ChemPlusChem ◽  
2016 ◽  
Vol 81 (6) ◽  
pp. 564-573 ◽  
Author(s):  
Yinle Li ◽  
Zhuqing Zhang ◽  
Tao Fan ◽  
Xiaoguang Li ◽  
Jin Ji ◽  
...  
Keyword(s):  
Magnetic Core ◽  
Shell Structures ◽  
Core Shell ◽  
Palladium Catalyzed

Magnetic Pt single and double core-shell structures for the catalytic selective hydrogenation of cinnmaladehyde

2020 ◽  
Vol 92 (3) ◽  
pp. 413-427 ◽  
Author(s):  
Robinson B. Dinamarca ◽  
Rodrigo Espinoza-González ◽  
Cristian H. Campos ◽  
Gina Pecchi
Keyword(s):  
Particle Size ◽  
Average Particle Size ◽  
Pt Nanoparticles ◽  
Magnetic Core ◽  
Shell Structures ◽  
Pt Catalyst ◽  
Core Shell ◽  
Average Particle ◽  
Cinnamyl Alcohol ◽  
Metal Support Interaction

AbstractThis study reports the catalytic preparation, characterization, and evaluation of nanoscale core-shell structures with a γ-Fe2O3 core covered by a SiO2 monoshell or by a SiO2@TiO2 multishell as a support for Pt nanoparticles (NPs) to synthesize active and operationally stable catalysts for selective liquid-phase cinnamaldehyde hydrogenation. The structures were designed with a magnetic core so they could be easily recovered from the catalytic bed by simple magnetization and with a SiO2 monoshell or a SiO2@TiO2 multishell to protect the magnetic core. At the same time, this study details the effect of the shell on the catalytic performance. Moreover, the effect of particle size on the selective production of cinnamyl alcohol was studied by preparing two families of catalysts with metal loadings of 1 wt% and 5 wt% Pt with respect to the core-shell. The particle size effect enabled the Fe2O3@SiO2-5%Pt system, with an average particle size of 5.6 nm, to reach 100 % conversion of cinnamaldehyde at 300 min of reaction, producing cinnamyl alcohol with 90 % selectivity; this result differed greatly from that of the Fe2O3@SiO2-1%Pt (dPt = 3.5 nm) system, which reached a maximum conversion at 600 min with 49 % selectivity for the product of interest. However, the Fe2O3@SiO2@TiO2-x%Pt systems showed lower levels of conversion and selectivity compared to those of the Fe2O3@SiO2-x%Pt catalysts, which is attributed to the fact that average metal particle sizes below 5.0 nm were obtained in both cases. After reduction in H2 at 773 K, the Fe2O3@SiO2@TiO2-1%Pt catalyst showed deactivation, reaching 10 % conversion at 600 min of reaction and 60 % selectivity for the product of interest. However, the reduced Fe2O3@SiO2@TiO2-5%Pt system showed 98 % conversion with 95 % selectivity for cinnamyl alcohol at 24 h of operation; the increase in selectivity is attributed to the combined effects of the increase in average particle size (~7.5 nm) and the presence of strong metal-support interaction – SMSI – effects after reduction. Finally, the most selective systems were tested for operational stability, where the Fe2O3@SiO2@-5%Pt catalyst could be reused in three consecutive operating cycles while maintaining its activity and selectivity for cinnamyl alcohol – unlike the Fe2O3@SiO2@TiO2-5%Pt reduced system, which was deactivated after the third reaction cycle due to active phase leaching.

MAGNETIC CORE SHELL STRUCTURES: from 0D to 1D assembling

2015 ◽  
Vol 21 (37) ◽  
pp. 5301-5311 ◽  
Author(s):  
Denisa Ficai ◽  
Anton Ficai ◽  
Elena Dinu ◽  
Ovidiu Oprea ◽  
Maria Sonmez ◽  
...  
Keyword(s):  
Magnetic Core ◽  
Shell Structures ◽  
Core Shell

scholarly journals On the relaxation time of interacting superparamagnetic nanoparticles and implications for magnetic fluid hyperthermia

2019 ◽  
Vol 10 ◽  
pp. 1280-1289 ◽  
Author(s):  
Andrei Kuncser ◽  
Nicusor Iacob ◽  
Victor E Kuncser
Keyword(s):  
Relaxation Time ◽  
Magnetic Fluid ◽  
Critical Discussion ◽  
Superparamagnetic Nanoparticles ◽  
Perturbation Approach ◽  
Interparticle Interactions ◽  
Micromagnetic Simulations ◽  
Magnetic Fluid Hyperthermia ◽  
Theoretical Support ◽  
Hyperthermia Therapy

A critical discussion on the presently available models for the relaxation time of magnetic nanoparticles approaching the superparamagnetic regime in the presence of interparticle dipolar interactions is considered. The direct implications of such interactions for magnetic fluid hyperthermia therapy through susceptibility loss mechanisms give rise to an indirect method for their study via specific absorption rate measurements performed on ferrofluids of different volume fractions. The theoretical support for the specific evolution of the relaxation time constant and the anisotropy energy barrier versus the interparticle interactions in a perturbation approach of the simple Néel expression for the relaxation time is provided via static and time-dependent micromagnetic simulations.

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