Article
Physics, Fluids & Plasmas
Alexander Ambarov, Vladimir S. Zverev, Ekaterina A. Elfimova
Summary: This paper investigates the dynamic magnetic properties of interacting immobilized magnetic nanoparticles with aligned easy axes in an applied perpendicular ac magnetic field. The system models magnetically sensitive composites synthesized from liquid dispersions of nanoparticles which lose translational degrees of freedom after polymerization. The results provide a theoretical basis for predicting the properties of soft, magnetically sensitive composites used in high-tech industrial and biomedical technologies.
Article
Physics, Applied
Martin Moeddel, Florian Griese, Tobias Kluth, Tobias Knopp
Summary: Advancements in micromachinery and nanotechnology, such as magnetically actuated microrobots for navigating in viscous environments, play a crucial role in medicine. Studies have shown that the spatial orientation of immobilized nanoparticles with parallel-aligned magnetic easy axes affects the magnetization response to an external dynamic magnetic field. This study introduces a method to estimate this orientation and experimentally investigate potential application scenarios.
PHYSICAL REVIEW APPLIED
(2021)
Article
Engineering, Electrical & Electronic
Ahmed L. Elrefai, Teruyoshi Sasayama, Takashi Yoshida, Keiji Enpuku
Summary: The alignment of magnetic easy axes significantly affects the magnetic properties of immobilized MNPs samples, with the influence decreasing as the strength of the ac excitation field increases. These findings are crucial for applications of immobilized MNPs in hyperthermia and magnetic particle imaging.
IEEE TRANSACTIONS ON MAGNETICS
(2021)
Article
Mechanics
Xinyu Jiang, Weixi Huang, Chunxiao Xu, Lihao Zhao
Summary: The rotational dynamics of a prolate spheroid in oscillating shear flows is investigated using direct numerical simulations with an immersed boundary method. The study focuses on the fluid inertia effect and identifies chaotic and nonchaotic rotation modes based on the sign of the largest Lyapunov exponent. These rotation modes depend on both the particle Reynolds number and oscillation frequency. An empirical expression is proposed to predict the rotation mode, and the mechanism behind chaotic rotation is discussed.
Article
Multidisciplinary Sciences
Ali F. Abu-Bakr, Andrey Yu. Zubarev
Summary: Experiments show that magnetic nanoparticles embedded in tissues often form heterogeneous clusters of various shapes, which can significantly impact the thermal properties of composite systems. A model is proposed to study heat production by particles in ring-shaped clusters, with results indicating a decrease in thermal effects with cluster appearance.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2021)
Article
Computer Science, Information Systems
Hsuan-Yu Tseng, Pao-Hsien Chu, Hao-Chun Lu, Ming-Jyh Tsai
Summary: Particle swarm optimization (PSO) is a popular stochastic approach for solving practical optimal problems due to its effective performance and few hyperparameters. This study proposes easy particles inspired by lazy ant behavior to diversify moving directions and improve the exploration abilities of all referenced PSO-based algorithms in solving nonlinear constrained optimization (NCO) problems to reduce premature convergence.
Article
Engineering, Electrical & Electronic
Antomne Caunes, Hayato Imamichi, Nagisa Kawasumi, Mitsuru Izumi, Tetsuya Ida
Summary: Pulsed magnetization is an attractive method for promoting the use of superconducting technology in commercial applications. Waveform control pulsed magnetization (WCPM) is a new technique that has shown promising results. Numerical simulations and experiments have been conducted to better understand and improve WCPM.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Engineering, Electrical & Electronic
M. D. Ainslie, A. Yamamoto
Summary: This paper investigates the thickness dependence of the trapped magnetic field in bulk MgB2 superconductors. The results from experiments and numerical simulations show that J(c) degrades as the sample thickness decreases, and the numerical modeling agrees well with the experimental results.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Engineering, Electrical & Electronic
E. Kurbatova, P. Kurbatov
Summary: This paper proposes a method to represent the anisotropic nonlinear superconducting properties using a discrete model, which reduces calculation time by analyzing magnetic systems with superconducting elements in a stationary mode. The application of this model is demonstrated by calculating force interactions between high-temperature superconducting samples and permanent magnets in different modes.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Mechanics
Ahmed K. K. Abu-Nab, Khaled G. G. Mohamed, Ali F. F. Abu-Bakr
Summary: Histotripsy uses sound waves to create cavitation microbubbles for liquefying tumor tissue cells. This study presents a theoretical and mathematical modeling of microbubble dynamics, considering the viscoelastic properties of biotissues. The proposed model takes into account the effect of viscosity, tissue elasticity modulus, and polytropic exponent in determining the microbubble cavitation radius.
ARCHIVE OF APPLIED MECHANICS
(2023)
Article
Physics, Multidisciplinary
Ali F. Abu-Bakr, Khaled G. Mohamed, Ahmed K. Abu-Nab
Summary: This study presents physico-mathematical models for the cavitation of microbubble clouds during histotripsy, considering bubble-bubble interaction and variable surface tension. The Keller-Miksis equations based on the Neo-Hookean and Quadratic Law Kelvin-Voigt models are transformed into ordinary differential equations using non-dimensional variables and solved analytically. The effects of viscoelastic medium on single microbubble dynamics and interbubble interactions are investigated. The study shows that the growth of a single bubble is more pronounced than the interaction of multiple bubbles, and the number and distance between bubbles play significant roles in the cavitation process during histotripsy of cancerous tissues.
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS
(2023)
Article
Physics, Multidisciplinary
A. Yu. Zubarev, L. Yu. Iskakova
Summary: This study presented the theoretical results of the initial stage of spinodal decomposition and magneto-diffusion transport in ferrofluids with single-domain ferromagnetic nanoparticles. The effects of magnetic field and long-ranged interparticle correlations on the kinetics of this transformation were analyzed.
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS
(2023)
Article
Physics, Multidisciplinary
A. Yu. Zubarev, A. Yu. Musikhin
Summary: The paper presents a theoretical study on the circulating flow in a channel filled with a non-magnetic liquid and an injected drop of a soluble ferrofluid under the influence of a uniform rotating magnetic field. The aim of this study is to develop a scientific understanding of drag transport intensification in thrombosed blood vessels. The results demonstrate that under realistic parameters, circulating flow with a velocity of approximately one hundred millimeters per second can be generated in a channel with a thickness of several millimeters. This can significantly enhance molecular transport (thrombolytics) in the channel.
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS
(2023)
Article
Physics, Multidisciplinary
A. Yu. Zubarev, L. Yu. Iskakova
Summary: This study proposes a theoretical model for the dynamic susceptibility and magnetoviscous effect in non-dilute polydisperse ferrofluids with magnetically interacting particles. The system is considered as a homogeneous magnetic colloid without any heterogeneous aggregates. The analysis is based on a mathematically regular approximation of the pair interparticle interaction combined with the effective field method, which agrees well with laboratory and computer experiments in dilute ferrofluids with non-interacting particles and computer simulations of monodisperse ensembles of magnetically interacting ferromagnetic particles.
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS
(2023)
Article
Physics, Multidisciplinary
A. Zubarev, L. Iskakova
Summary: The paper presents theoretical modelling of the dynamic remagnetization process of a dimer composed of two single-domain ferromagnetic particles immobilized in a non-magnetic medium. The results demonstrate that dimer formation leads to an increase in system magnetization and a significant increase in the characteristic time of remagnetization.
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS
(2023)
Article
Physics, Multidisciplinary
Ali F. Abu-Bakr, Andrey Yu. Zubarev
Summary: This paper presents a theoretical study on the effect of clustering of ferromagnetic nanoparticles on the intensity of magnetic hyperthermia in non-liquid systems. Four-particle clusters with two different spatial arrangements of the ferroparticles are considered. The results show that particle clustering reduces the thermal effect and the morphology of the clusters influences this effect.
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS
(2023)
Article
Chemistry, Multidisciplinary
Alexander P. Safronov, Elena V. Rusinova, Tatiana V. Terziyan, Yulia S. Zemova, Nadezhda M. Kurilova, Igor. V. Beketov, Andrey Yu. Zubarev
Summary: The addition of dispersed magnetic particles to alginate gels and solutions allows for the control of their rheo-elastic properties, making them valuable for tissue regeneration and engineering applications.
APPLIED SCIENCES-BASEL
(2023)
Article
Thermodynamics
Ahmed K. Abu-Nab, Ali F. Abu-Bakr
Summary: This paper proposes theoretical and mathematical models for the interaction of lipid-encapsulated microbubbles in soft tissues, considering the effect of shell thickness. The models include both single encapsulated microbubbles and interacting microbubbles in lipid shells. The modified Church equations for microbubbles with different shell thickness are analytically solved, and it is found that the radii of outer microbubble dynamics are larger than those of inner radii of encapsulated microbubble dynamics under the effect of layer thickness.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Physics, Fluids & Plasmas
Ilya Starodumov, Ksenia Makhaeva, Andrey Zubarev, Ivan Bessonov, Sergey Sokolov, Pavel Mikushin, Dmitri Alexandrov, Vasiliy Chestukhin, Felix Blyakhman
Summary: This theoretical study focuses on investigating the role of the cell-free layer (CFL) near the vessel wall in hemodynamics and its relevance to interventional cardiology. The study found that the CFL thickness and its contribution to hemodynamics are non-uniform along the vessel in the presence of stenosis. The effects of CFL on velocity profiles, vortex formation, hematocrit, viscosity, and wall shear stresses in the stenosis area were determined.
Article
Engineering, Multidisciplinary
Alexander P. Safronov, Nadezhda M. Kurilova, Lidiya V. Adamova, Tatyana F. Shklyar, Felix A. Blyakhman, Andrey Yu. Zubarev
Summary: In this study, hydrogels with interpenetrated physical and chemical networks were synthesized using natural polysaccharide-calcium alginate (CaAlg) and synthetic polymer-polyacrylamide (PAAm). The water uptake and compatibility of the combined gels were characterized. Mechanical and electrical properties of the gels were also studied. The results showed potential applications of these hydrogels in biomimetic materials for biomedicine and bioengineering.
Article
Chemistry, Physical
A. Yu. Zubarev
Summary: This study presents the theoretical analysis of the dynamic susceptibility of soft elastic-viscous ferrogels with embedded single-domain ferromagnetic particles chaotically distributed in the host medium. The effect of magnetic interparticle interaction is focused on, and the results show that the interparticle interaction enhances the composite magnetization and reduces its remagnetization rate under a weak applied magnetic field.
Article
Materials Science, Multidisciplinary
A. Yu. Zubarev, L. Yu. Iskakova
Summary: This study presents theoretical results on the effect of magnetic interparticle interaction on the kinetics of remagnetization in magnetic gels with immobilized single-domain particles. The magnetic anisotropy of the particles is assumed to be very strong, and the particle axis of easy magnetization is randomly oriented. The results demonstrate that the interparticle interaction affects the kinetics of particle remagnetization, with the strength of the applied magnetic field playing a deciding role. Specifically, this interaction slows down the composite remagnetization when the applied magnetic field is weak, but speeds it up when the field is high.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Thermodynamics
Ahmed K. Abu-Nab, Mahmoud I. Elgammal, Ali F. Abu-Bakr
Summary: The study introduces a theoretical and mathematical model of growing bubbles in a generalized Newtonian fluid at low Mach numbers, highlighting the roles of magnetic field, shear stress, and electrical conductivity in the bubble growth process. The analysis also provides insights into the bubble radius in non-Newtonian, Newtonian, and viscoelastic fluids under specific flow index values, along with the impact of magnetic field strength on gas bubble growth behavior.
JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER
(2022)
