Article
Chemistry, Multidisciplinary
Marie-Charlotte Horny, Jean Gamby, Vincent Dupuis, Jean-Michel Siaugue
Summary: Magnetic hyperthermia on core-shell nanoparticles has shown promising advancements in biomedical applications, allowing for the release of DNA targets to mimic specific biological molecules. Silica-coated magnetic nanoparticles demonstrate efficient heating capabilities while maintaining low solution temperatures, making them suitable for biological media and energy efficiency.
Article
Nanoscience & Nanotechnology
Mathilde Le Jeune, Emilie Secret, Michael Trichet, Aude Michel, Delphine Ravault, Francoise Illien, Jean-Michel Siaugue, Sandrine Sagan, Fabienne Burlina, Christine Menager
Summary: The endosomal entrapment of functional nanoparticles is a severe limitation to their use for biomedical applications. In this study, a conjugation strategy using cationic peptides was developed to improve the access of magnetic nanoparticles (MNPs) to the cytosol. It was found that peptides rich in histidine residues can promote endosomal escape and enhance the delivery of MNPs to the cytosol.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Ji Hun Jung, Gye Seok An
Summary: This study investigates a method for synthesizing gamma-Fe2O3@SiO2 nanoparticles using sodium silicate (Na2SiO3) as a precursor. A surface treatment involving an acid or base is utilized to prepare activation sites for grafting the SiO2 network onto the magnetic particles. The effects of pH on the surface charge and coating layer thickness of the nanoparticles are analyzed, and the optimal pH is determined. The resulting nanoparticles exhibit improved dispersibility and are evaluated for DNA purification. Residual Na ions on the particle surface can reduce the purification efficiency, so additional acid treatment is performed to remove them. The correlation between surface charge and interparticle forces is examined, and it is found that the purification efficiency improves as the zeta potential and particle size distribution increase. In conclusion, gamma-Fe2O3@Na2SiO3 nanoparticles are successfully fabricated using Na2SiO3 and additional acid treatment, providing a promising alternative method for synthesizing gamma-Fe2O3@SiO2 nanoparticles with improved dispersibility and purification efficiency.
ACS APPLIED NANO MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
C. R. D. de Freitas, R. B. da Silva, J. M. Soares, P. R. T. Ribeiro, F. L. A. Machado, J. M. Sasaki
Summary: In this work, the structure and magnetic properties of bimagnetic core-shell CoO@MnFe2O4 nanoparticles were studied. It was found that the coercivity and the exchange-bias effect were enhanced at low temperatures, and these phenomena were explained by a model based on the exchange-coupling of the magnetic moments at the core-shell interface.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Garret Dee, Hend Shayoub, Helen McNeill, Itziar Sanchez Lozano, Aran Rafferty, Yurii K. Gun'ko
Summary: The main objective of this study is to develop new magnetic core-shell nanostructures for the removal of dye pollutants from water using an external magnetic field. The prepared nanoparticles demonstrated excellent adsorption properties for methylene blue dye, which was validated by UV-visible spectroscopy. The particles retained their ability to adsorb the pollutant after multiple cycles and showed no change in morphology. This research highlights the potential of magnetic core-shell nanostructures for water remediation.
Article
Chemistry, Multidisciplinary
A. Omelyanchik, S. Villa, M. Vasilakaki, G. Singh, A. M. Ferretti, A. Ponti, F. Canepa, G. Margaris, K. N. Trohidou, D. Peddis
Summary: By designing nanoparticle systems with core/shell morphology, magnetic anisotropy was successfully modulated, leading to adjustments in magnetic dipolar interactions between particles. Both nanoparticle systems exhibit high saturation magnetisation and display superparamagnetic behavior at room temperature, with strong exchange coupling observed at the core/shell interface.
NANOSCALE ADVANCES
(2021)
Article
Chemistry, Multidisciplinary
Suchandra Goswami, Pushpendra Gupta, Sagarika Nayak, Subhankar Bedanta, Oscar Iglesias, Manashi Chakraborty, Debajyoti De
Summary: This study reports the method of controlling the exchange bias effect by manipulating the interparticle interactions in nanocrystalline core/shell structures. The results indicate that the interparticle interactions have a significant impact on the magnetic properties, with a more pronounced collective behavior observed in concentrated assemblies. This finding contributes to a better understanding of the magnetic behavior in nanoparticle systems.
Article
Nanoscience & Nanotechnology
Jeotikanta Mohapatra, Meiying Xing, Rui Wu, Jinbo Yang, Ping Liu
Summary: This report investigates the exchange-bias effect of Co/CoO core/shell nanoparticles with an amorphous CoO shell. The spin-glass state in the CoO shell at low temperatures creates a unidirectional anisotropy in the Co core, resulting in a large exchange bias field of up to 3.6 kOe. By improving the crystallinity of the CoO shell, the spin-glass ordering is suppressed, leading to a significantly lower exchange-bias field (2.2 kOe) and a prominent training effect due to multiple easy axes in the multi-crystalline CoO shell. Theoretical studies confirm the significant impact of the emerging spin-glass state on the exchange bias of the system. These findings offer a new approach for manipulating and fine-tuning exchange bias effects in nanoscale systems for spintronics applications.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Ceramics
Rachida Lamouri, Ki Hyeon Kim
Summary: In this study, MnFe2O4 nanoparticles were synthesized through a facile solvothermal method and then enveloped with iron oxide nanoparticles using ethanol and ethylene glycol as solvents. The resulting nanoparticles showed a homogeneous distribution of spherical particles with an average size of 12 to 16 nm. The encapsulation process did not affect the particle distribution, with a very thin layer of Fe3O4 on the shell structure. The core@shell structure exhibited improved magnetic properties compared to pure MnFe2O4, as confirmed by magnetization and electron spin resonance. The heating efficiency, evaluated in terms of specific loss power, was significantly increased in the core@shell structure.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Subenthung P. Tsopoe, Chandan Borgohain, Jyoti Prasad Borah
Summary: Magnetic hyperthermia, a notable technique for tumor treatment, relies on magnetic nanoparticles (MNPs) that release heat when exposed to magnetic fields. This study investigates a unique CS structure with antiferromagnetic NiO as the core and ferrimagnetic Fe3O4 as the shell to enhance the heating efficiency. The results show a significant increase in specific absorption rate (SAR) for the CS N@F compared to bare Fe3O4, suggesting a potential improvement in theranostics using MNPs.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Yuan Wang, Xuemei Liu, Quyun Chen, Tian C. Zhang, Like Ouyang, Shaojun Yuan
Summary: This study focuses on the efficient removal of arsenite pollution in groundwater using BiOI/gamma-Fe2O3 core-shell nanoparticles as photocatalysts. The optimal molar ratio of BiOI to gamma-Fe2O3 is found to be 2:1. The main active substances for the photocatalytic oxidation of As(III) on BiOI/gamma-Fe2O3 are identified as ∙O2- and h+.
MATERIALS TODAY CHEMISTRY
(2022)
Article
Biochemistry & Molecular Biology
Venkatesha Narayanaswamy, Jayalakshmi Jagal, Hafsa Khurshid, Imaddin A. A. Al-Omari, Mohamed Haider, Alexander S. S. Kamzin, Ihab M. M. Obaidat, Bashar Issa
Summary: Magnetically soft-soft MnFe2O4-Fe3O4 core-shell nanoparticles were synthesized and their magnetic and thermal properties were studied. The results showed that the shell thickness had no significant effect on the magnetic properties, while the interface spin freezing between the shell and core played an important role. These nanoparticles have potential applications in cancer treatment.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Beatrice Muzzi, Martin Albino, Michele Petrecca, Claudia Innocenti, Cesar de Julian Fernandez, Giovanni Bertoni, Clara Marquina, Manuel Ricardo Ibarra, Claudio Sangregorio
Summary: In this study, the effect of dual-doping of Fe-(II) with Co-(II) and Ni-(II) on crystal structure and magnetic properties is investigated. The results show that Ni-Co doped iron oxide core@shell nanoparticles with high coercivity and increased antiferromagnetic ordering transition temperature close to room temperature can be obtained.
Article
Nanoscience & Nanotechnology
Rashmi Joshi, Sandeep Balu Shelar, Manas Srivastava, Bheeshma Pratap Singh, Lokesh Goel, Raghumani Singh Ningthoujam
Summary: Monodispersed core@shell gamma-Fe2O3@MnxOy nanoparticles were prepared through thermolysis and coated with biocompatible substances. They showed high biocompatibility for different cell lines and exhibited enhanced cancer cell killing through hyperthermia. Folic acid and fluorescein isothiocyanate were tagged onto the nanoparticles, enabling simultaneous therapy, imaging, and targeting capabilities.
ACS APPLIED BIO MATERIALS
(2022)
Article
Chemistry, Physical
Xin Kou, Yongpeng Zhao, Lijia Xu, Zhiliang Kang, Yuchao Wang, Zhiyong Zou, Peng Huang, Qianfeng Wang, Gehong Su, Ying Yang, YanMing Sun
Summary: The design of high-performance microwave absorbing materials relies on the structural design of heterostructures and appropriate material compositions. In this study, a composite material consisting of reduced graphene oxide (RGO) and core-shell structured gamma-Fe2O3@C nanoparticles was successfully synthesized. The composite material exhibited multiple electromagnetic dissipation mechanisms and had a wide absorption range.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Multidisciplinary Sciences
F. G. Silva, J. Depeyrot, Yu L. Raikher, V. Stepanov, I. S. Poperechny, R. Aquino, G. Ballon, J. Geshev, E. Dubois, R. Perzynski
Summary: In the study of exchange bias properties of MnFe2O4@gamma-Fe2O3 core-shell nanoparticles, three types of magnetic anisotropies were identified: easy-axis anisotropy, unidirectional exchange-bias anisotropy, and rotatable anisotropy. These anisotropies arise from different structural interfaces and spin couplings. The experimental results provide insights into the dynamics of the magnetic moment and are interpreted within the framework of superparamagnetic theory, with a focus on the effect of thermal fluctuations.
SCIENTIFIC REPORTS
(2021)
Article
Physics, Applied
D. A. Balaev, I. S. Poperechny, A. A. Krasikov, S. Semenov, S. Popkov, Y. Knyazev, V. L. Kirillov, S. S. Yakushkin, O. N. Martyanov, Yu L. Raikher
Summary: The study on the magnetodynamics of cobalt ferrite nanoparticles revealed the influence of the superparamagnetic effect, with the increase in magnetic field variation rate leading to an increase in coercivity and a decrease with temperature. The proposed theoretical model explained the observed phenomena well.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Multidisciplinary Sciences
Mikhail V. Vaganov, Dmitry Yu. Borin, Stefan Odenbach, Yuriy L. Raikher
Summary: A new model is proposed to describe the magnetization of a magnetoactive elastomer filled with magnetically hard powder, emphasizing the complexity of magnetization and mechanical rotation of single-domain particles, and analyzing the influence of slippage on the composite material's magnetization.
ADVANCED THEORY AND SIMULATIONS
(2021)
Article
Multidisciplinary Sciences
V. V. Rusakov, Y. L. Raikher
Summary: A model is developed to describe the oscillations of optical anisotropy induced in a viscoelastic ferrocolloid by an AC magnetic field. The solution is obtained by applying effective field approximation and the peculiarities imparted by viscoelasticity in a ferrocolloid sample are discussed.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2022)
Article
Polymer Science
Liudmila A. Makarova, Danil A. Isaev, Alexander S. Omelyanchik, Iuliia A. Alekhina, Matvey B. Isaenko, Valeria V. Rodionova, Yuriy L. Raikher, Nikolai S. Perov
Summary: Multiferroics are materials that exhibit unique properties under the influence of magnetic and electric fields, achieved through a combination of ferromagnetic and ferroelectric particles. In soft polymer matrices, the separation of particles results in a more complex multiferroic coupling compared to solid composites.
Article
Engineering, Electrical & Electronic
Aleksandr Ryzhkov, Yuriy L. Raikher
Summary: Molecular dynamics simulation is used to investigate the response of magnetosensitive vesicles to an external magnetic field. The study reveals that the vesicles do not fully restore their shape after an on/off switching cycle.
IEEE MAGNETICS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Oleg Stolbov, Yuriy Raikher
Summary: The letter presents a new phenomenological model that explains the field/stress response of a magnetoactive elastomer with induced pseudoplasticity on a unified basis. The model successfully demonstrates the elastic behavior of a composite with high ferromagnet filler content under zero/low field and its transition to plasticity under a stronger field. The sample's elasticity is restored upon removing the field. The one-dimensional variant of the model shows good agreement with numerical experiments performed on quasi-1-D samples.
IEEE MAGNETICS LETTERS
(2022)
Article
Instruments & Instrumentation
T. Becker, O. Stolbov, A. M. Biller, D. Yu Borin, O. S. Stolbova, K. Zimmermann, Yu L. Raikher
Summary: This study investigates the macroscopic field-controlled mechanics of magnetoactive elastomers of mixed content, particularly focusing on the bending deformation of horizontally fixed magnetoactive cantilevers. The model developed based on finite-strain theory provides good agreement with experimental observations up to moderate concentrations of the MS filler, highlighting the importance of filler concentration in influencing material properties.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Polymer Science
Kirill Sobolev, Valeria Kolesnikova, Alexander Omelyanchik, Yulia Alekhina, Valentina Antipova, Liudmila Makarova, Davide Peddis, Yuriy L. Raikher, Katerina Levada, Abdulkarim Amirov, Valeria Rodionova
Summary: This study focuses on polymer-based multiferroics, which combine magnetic and piezoelectric properties and have the potential for fabricating biocompatible scaffolds. The study investigates composites based on PVDF-TrFE polymer matrices filled with a combination of piezoelectric and/or ferrimagnetic particles. The results show that the presence of certain particles enhances the magnetoelectric response of the composites. Moreover, the mechanical properties of the composite and its local surfacial mechanical properties are crucial factors to consider for stem cell cultivation.
Article
Chemistry, Physical
Oleg V. Stolbov, Artyom A. Ignatov, Valeria V. Rodionova, Yuriy L. Raikher
Summary: In this work, the behavior of a three-component composite multiferroic is investigated, in which an electrically neutral polymer matrix is filled with a mixture of piezoelectric and ferromagnetic micrometer-size particles. The main focus is on the electric polarization generated in a thin film of such a material in response to a quasistatic magnetic field. The driving mechanism is the rotation of magnetically hard particles inside the matrix, transferring mechanical stresses to the piezoelectric grains.
Article
Multidisciplinary Sciences
Oleg Stolbov, Pedro A. Sanchez, Sofia S. Kantorovich, Yuriy L. Rancher
Summary: This article presents a comparative analysis of a composite material called magnetoactive elastomer (MAE), which consists of a polymer matrix filled with magnetically soft and hard particles. The analysis is conducted using a coarse-grained molecular dynamics simulation model and a continuum magnetomechanical description. The study finds that the composite unit comprising magnetically soft and hard particles can exhibit a nontrivial reentrant axial deformation under variation of the applied field strength.
PHYSICAL SCIENCES REVIEWS
(2022)
Article
Chemistry, Physical
Mikhail V. Vaganov, Dmitry Yu. Borin, Stefan Odenbach, Yuriy L. Raikher
Summary: In this study, the magnetization of magnetoactive elastomers (MAE) with unstable interfaces between the matrix and magnetic particles, allowing for particle slipping, was investigated. The maximal angle of particle displacement from the initial position was estimated based on cyclic measurement of hysteresis loops at different magnetic fields. A model considering slipping of magnetically hard multigrain particles in an elastic environment was proposed and found to be in good agreement with experimental data.
Proceedings Paper
Materials Science, Multidisciplinary
O. Stolbov, Yu L. Raikher
Summary: The analysis of the magnetostriction effect on a spherical sample of MAE revealed two possible scenarios for elongation, depending on the material parameters. One scenario involves the formation of 'beaks' on the sphere, deviating its shape drastically from a spheroidal one, without showing hysteresis in the overall elongation. The second scenario, related to MAEs with higher magnetic properties and softer matrices, suggests that beak formation could happen simultaneously with a jump-like overall elongation, resembling a first-order transition pattern. Upon evaluation, it is concluded that the second scenario is unlikely, while the first scenario is much more achievable.
XXII WINTER SCHOOL ON CONTINUOUS MEDIA MECHANICS (WSCMM 2021)
(2021)
Article
Chemistry, Physical
V. V. Rusakov, Yu. L. Raikher
Summary: A viscoelastic ferrocolloid was studied using a weak magnetic field, resulting in rotational oscillations of nanoparticles. The rheology of the dispersion medium was described, showing that an increase in medium elasticity affects the position and height of the main peak.
