Combination of magnetic field and surface functionalization for reaching synergistic effects in cellular labeling by magnetic core–shell nanospheres

2014 ◽  
Vol 2 (12) ◽  
pp. 1750-1760 ◽  
Author(s):  
Tina Gulin-Sarfraz ◽  
Jixi Zhang ◽  
Diti Desai ◽  
Jarmo Teuho ◽  
Jawad Sarfraz ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Surface Functionalization ◽  
Synergistic Effects ◽  
Joint Effect ◽  
Magnetic Core ◽  
Core Shell ◽  
Cellular Labeling ◽  
Effect Of Surface

The joint effect of surface functionalization and an external magnetic field on cellular labeling was studied.

Magnetic core–shell nanoprobe for sensitive killing of cancer cells via induction with a strong external magnetic field

RSC Advances ◽  
2014 ◽  
Vol 4 (39) ◽  
pp. 20077-20085 ◽  
Author(s):  
Samir Mandal ◽  
Nabanita Chatterjee ◽  
Subhadip Das ◽  
Krishna Das Saha ◽  
Keya Chaudhuri
Keyword(s):  
Magnetic Field ◽  
Side Effects ◽  
External Magnetic Field ◽  
Cancer Cells ◽  
Sodium Arsenite ◽  
Anticancer Agent ◽  
Magnetic Core ◽  
Core Shell ◽  
Title System

The title system, composed of a highly magnetic core surrounded by a thin arsenite shell, has been synthesized and applied to the magnetically facilitated targeting of anticancer agent (sodium arsenite) at lower dose with minimal side effects and higher efficacy in a biocompatible manner.

scholarly journals Ionic magnetic core–shell nanoparticles for DNA extraction

RSC Advances ◽  
2020 ◽  
Vol 10 (64) ◽  
pp. 38818-38830
Author(s):  
Tammar Hussein Ali ◽  
Amar Mousa Mandal ◽  
Thorsten Heidelberg ◽  
Rusnah Syahila Duali Hussen ◽  
Ean Wai Goh
Keyword(s):  
Magnetic Field ◽  
Particle Size ◽  
External Magnetic Field ◽  
Small Particle ◽  
Magnetic Core ◽  
Core Shell ◽  
Small Particle Size ◽  
Particle Loading ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

The fabrication ionic magnetic core-shell nanoparticles were simple synthesize with a super-ferromagnetic and small particle size properties, which enabled sufficient DNA particle loading with easy isolation based on an external magnetic field.

scholarly journals Carbon-coated Fe3O4 core–shell super-paramagnetic nanoparticle-based ferrofluid for heat transfer applications

2021 ◽  
Author(s):  
Mohd Imran ◽  
Nasser Zouli ◽  
Tansir Ahamad ◽  
Saad M. Alshehri ◽  
Mohammed Rehaan Chandan ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Thermal Conductivity ◽  
External Magnetic Field ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Carbon Coated ◽  
Core Shell Nanoparticles ◽  
Fe3o4 Core

Ferrofluids prepared by dispersing superparamagnetic Fe3O4@C core–shell nanoparticles in water exhibited exceptional enhancement in thermal conductivity without an external magnetic field.

The Composition and Magnetic Structure of Fe3O4/γ-Fe2O3 Core-Shell Nanocomposites under External Magnetic Field: Mössbauer Study (Part II)

2020 ◽  
Vol 62 (11) ◽  
pp. 2167-2172
Author(s):  
A. S. Kamzin ◽  
I. M. Obaidat ◽  
A. A. Valliulin ◽  
V. G. Semenov ◽  
I. A. Al-Omari
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Magnetic Structure ◽  
Core Shell ◽  
Mössbauer Study

scholarly journals Мёссбауэровские исследования состава и магнитной структуры нанокомпозитов Fe-=SUB=-3-=/SUB=-O-=SUB=-4-=/SUB=-/γ-Fe-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=- типа ядро-оболочка во внешнем магнитном поле (Часть 2)

2020 ◽  
Vol 62 (11) ◽  
pp. 1919
Author(s):  
А.С. Камзин ◽  
I.M. Obaidat ◽  
А.А. Валлиулин ◽  
В.Г. Семенов ◽  
I.A. Al-Omari
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Spin Structure ◽  
Magnetic Moments ◽  
Core Shell ◽  
Fe2o3 Nanoparticles ◽  
Synthesis Conditions ◽  
The Core ◽  
Canted Spin ◽  
Shell Particles

The results of Mössbauer studies of the composition and magnetic structure of Fe3O4 / -Fe2O3 nanoparticles placed in an external magnetic field with a strength of 1.8 kOe, which is a continuation of the work [A.S. Kamzin, I.M. Obaidat, A.A. Valliulin, V.G. Semenov, I.A. Al-Omari. FTT No. 10/2020]. It is shown that the thickness of the maghemite (-Fe2O3) shell can be changed by the synthesis conditions. It was found that on the surface of the maghemite (-Fe2O3) shell in the Fe3O4 / -Fe2O3 nanocomposites there is a layer in which the magnetic moments are not oriented collinearly to the moments located in the depth of the shell, i.e., there is a canted spin structure. An intermediate layer in the spin-glass state is formed between the core and the shell. The data obtained on the structure of core / shell particles are important for understanding the properties of nanocomposites, which are of great interest for applications in various fields, including biomedicine.

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.

The magnetoelliptic instability of rotating systems

2009 ◽  
Vol 632 ◽  
pp. 401-430 ◽  
Author(s):  
K. A. MIZERSKI ◽  
K. BAJER
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Gravitational Interaction ◽  
Joint Effect ◽  
Flow Models ◽  
Analytical Technique ◽  
Rotating Systems ◽  
Astrophysical Objects ◽  
Tidal Deformations ◽  
The Magnetic Field

We address the question of stability of the Euler flow with elliptical streamlines in a rotating frame, interacting with uniform external magnetic field perpendicular to the plane of the flow. Our motivation for this study is of astrophysical nature, since many astrophysical objects, such as stars, planets and accretion discs, are tidally deformed through gravitational interaction with other bodies. Therefore, the ellipticity of the flow models the tidal deformations in the simplest way. The joint effect of the magnetic field and the Coriolis force is studied here numerically and analytically in the limit of small elliptical (tidal) deformations (ζ ≪ 1), using the analytical technique developed by Lebovitz & Zweibel (Astrophys. J., vol. 609, 2004, pp. 301–312). We find that the effect of background rotation and external magnetic field is quite complex. Both factors are responsible for new destabilizing resonances as the vortex departs from axial symmetry (ζ ≪ 1); however, just like in the non-rotating case, there are three principal resonances causing instability in the leading order. The presence of the magnetic field is very likely to destabilize the system with respect to perturbations propagating in the direction of the magnetic field if the basic vorticity and the background rotation have opposite signs (i.e. for anticyclonic background rotation). We present the dependence of the growth rates of the modes on various parameters describing the system, such as the strength of the magnetic field (h), the inverse of the Rossby number (ℛv), the ellipticity of the basic flow (ϵ) and the direction of propagation of modes (ϑ). Our analytical predictions agree well with the numerical calculations.

Magnetic Radio Modifier Based on the Fe3O4/Ta2O5 Nanoparticles

2018 ◽  
Vol 386 ◽  
pp. 156-160
Author(s):  
Ksenya Sergeevna Lukуanenko ◽  
Vladimir Iosifovich Apanasevich ◽  
Leonid Lazarevich Afremov ◽  
Olga Vycheslavovna Tarakova ◽  
Olga Sergeevna Plotnikova ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Radiation Therapy ◽  
Tumor Cells ◽  
Magnetic Core ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
The Core ◽  
Electron Positron ◽  
Nanoparticles Concentration ◽  
Core Shell Nanoparticles

The possibility of application of magnetic core-shell Fe3O4/Ta2O5nanoparticles has been investigated in order to enhance the effect of radiation therapy. It has been shown, that an increase of the concentration of the core-shell nanoparticles due to the influence of the nonuniform magnetic field enhances the absorption of gamma quanta with energy destroying tumor cells (20-200 keV). In addition, an increase of nanoparticles concentration promotes the formation of electron-positron pairs, annihilation of which are leads to an increase in the number of secondary gamma quanta with an energy of 511 keV.

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