Article
Physics, Multidisciplinary
Maria Tatulea-Codrean, Eric Lauga
Summary: By studying the synchronization of bacterial flagella through an elastohydrodynamic mechanism, this study shows that bacterial flagella spontaneously synchronize with zero phase difference. The far-field rate of synchronization is maximized at an intermediate value of elastic compliance, which has important implications for bacteria.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Physical
Behrouz Behdani, Kun Wang, Carlos A. Silvera Batista
Summary: Metallodielectric Janus particles and electric fields play a crucial role in the development of innovative concepts on AC electrokinetics, directed transport, and collective dynamics. Measurement methods and strategies to tailor the polarizability of JPs are discussed, providing insights into the fundamental polarization mechanisms through modeling. Insights from this study offer quantitative information for the design of colloidal machines with desired features such as targeted propulsion and tunable collective dynamics.
Article
Physics, Fluids & Plasmas
Christopher L. Sercel, Tate M. Gill, Benjamin A. Jorns
Summary: The induced magnetic field during acceleration in a pulsed rotating magnetic field (RMF) thruster is experimentally investigated. The plasma currents induced in the thruster are shown to be able to form a field-reversed configuration plasmoid, and the Lorentz force resulting from the induced magnetic field contributes to about 25% of the measured thrust.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Behrouz Behdani, Jacob Lumpkins, Carlos A. Silvera A. Batista
Summary: The objective of this article is to investigate the effect of electric polarizability on the propulsion and collective dynamics of metallodielectric Janus particles. Janus particles with sequential layers of titanium and SiO2 were fabricated to create model systems. The study found that the propulsion velocity spectra closely matched the electrorotation spectra, indicating a relationship between the two. The results also showed that the propulsion velocity reflects the real part of the particles' polarizability, and the thickness of the metal cap affects their behavior.
Article
Chemistry, Multidisciplinary
Zhaoqing Cong, Songsong Tang, Leiming Xie, Ming Yang, Yangyang Li, Dongdong Lu, Jiahong Li, Qingxin Yang, Qiwei Chen, Zhiqiang Zhang, Xueji Zhang, Song Wu
Summary: A unique robotic medical platform is designed using cell robots as carriers to selectively bind and kill tumors with oncolytic adenovirus. The cell robots are modified and coated to enable specific targeting and movement within the body, resulting in enhanced efficacy in tumor treatment.
ADVANCED MATERIALS
(2022)
Article
Multidisciplinary Sciences
Tieyan Si, Zhenwei Wu, Wenping He, Qiang He
Summary: We studied the predatory-prey dynamics of self-propelled clusters of Janus micromotors, which generates an oxygen bubbles cloud by decomposing H2O2 and enhances its mobility to wander around and devour other clusters. The fast decomposition of H2O2 also induces a tubular low-concentration zone that bridges two far separated clusters, resulting in a diffusio-osmotic pressure that drives the clusters to meet. This predatory-prey phenomena mimic white blood cells chasing bacteria and swarming flocks in nature, shedding light on emergent collective intelligence in biology.
Article
Astronomy & Astrophysics
Matteo Buzzegoli, Jonathan D. Kroth, Kirill Tuchin, Nandagopal Vijayakumar
Summary: In this study, we investigated the synchrotron radiation emitted by a charged fermion in a constant magnetic field parallel to the axis of rotation. The rotation is classical and independent of the magnetic field. We derived the intensity, spectrum, and chirality of the electromagnetic radiation using the exact solution of the Dirac equation. Our numerical calculations demonstrate that the effect of rotation on the radiation intensity increases with the particle energy and can either strongly enhance or suppress the radiation, depending on the relative orientation of the vectors omega and B and the sign of the electric charge.
Article
Mechanics
Evgeny S. Asmolov, Tatiana Nizkaya, Olga Vinogradova
Summary: Catalytic Janus swimmers exhibit diffusiophoretic motion by generating gradients of concentrations and electric potential spontaneously. This study considers the experimentally relevant scenario of particles releasing both types of ions and derives a simple expression for particle velocity in the limit of a thin electrostatic diffuse layer. The approximate expression remains highly accurate even in the presence of large ion fluxes and surface potentials, and it offers explanations for several intriguing phenomena, such as the reversal of particle motion in response to variations in the salt concentration or the self-diffusiophoresis of uncharged particles.
Article
Engineering, Aerospace
Junjun Zhang, Bin Sun, Chang Lu, Guangqing Xia, Chong Chen
Summary: The energy coupling process in a thruster using a rotating electric field was simulated under different external magnetic field strengths. The interaction between electrons and the sheath layer was found to be affected by the magnetic field, resulting in changes in electron speed, power absorption, and density. The current density and total current density increased, while ions showed little response to the changes. The characteristics of plasma exhibited a nonlinear change with increasing magnetic field strength.
Article
Chemistry, Multidisciplinary
Shahar Erez, Emil Karshalev, Yue Wu, Joseph Wang, Gilad Yossifon
Summary: The microbowl-shaped Janus particles demonstrate effective electrical propulsion, cargo trapping, and transport capabilities, with a strong dependence on the layering order of Au and TiO2 for mobility and cargo loading. The concave side of the microbowl provides a negative dielectrophoretic trap for enhanced cargo loading capacity in biological and biomedical applications.
Article
Chemistry, Multidisciplinary
Jin Gyun Lee, Cooper P. Thome, Zoe A. Cruse, Arkava Ganguly, Ankur Gupta, C. Wyatt Shields
Summary: This study presents a method of magnetically assembling locked clusters of Janus particles, which display diverse trajectories when stimulated by AC electric fields. The orientation of particles within each cluster determines the different modes of locomotion. The predicted and experimentally observed cluster trajectories show qualitative agreement. This method provides a scalable way to create micromotors with a range of well-defined motions.
Article
Chemistry, Multidisciplinary
Qiao Yu, Baihai Su, Weifeng Zhao, Changsheng Zhao
Summary: A self-propelled chitosan-based hydrogel with CaCO3 was developed for efficient hemostasis, using the release of Ca2+ to accelerate clot formation and achieve excellent hemostatic efficiency.
Article
Chemistry, Multidisciplinary
L. Xie, Z. Cong, S. Tang, M. Yang, Y. Li, C. Ren, Q. Chen, D. Lu, F. Wan, X. Zhang, S. Wu
Summary: This study introduces tumor cell-based microrobots loaded with oncolytic adenovirus and coated with Fe3O4 nanoparticles. These microrobots exhibit homologous adhesion, active virotherapy, and magnetic navigation capabilities. The replication of the infected virus inside the host cells allows for persistent and specific tumor infection and killing. The combination of magnetic propulsion and homologous binding greatly enhances the binding and penetration of the microrobots, improving their cell-killing efficacy.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Engineering, Multidisciplinary
Pengfei Lin, Ning Zhang, Chunsheng Lin, Ming Chang, Lei Xu
Summary: The detection and localization of magnetic targets based on magnetic field signals have been a research hotspot, with a study establishing a magnetic field model for a rotating propeller as a magnetic dipole and proposing a positioning algorithm based on the rotating magnetic dipole. The analysis of positioning accuracy and factors such as uneven magnetic distribution and measurement noise revealed that accuracy increases with circular trajectory radius of magnetic moment and error due to noise increases with distance from the magnetic dipole source. Experimental verification confirmed the feasibility of the algorithm.
Article
Thermodynamics
Andrzej Skumiel, Peter Kopcansky, Milan Timko, Matus Molcan, Katarina Paulovicova, Rafal Wojciechowski
Summary: The physical principles of magnetic hyperthermia are based on the heat generation of magnetic nanoparticles under the influence of applied magnetic fields of different configurations. The choice of a suitable methodology for generating a magnetic field can significantly affect the resulting thermal effect and thus the efficiency itself. By comparing the efficiency when the rotating magnetic field is applied versus the alternating magnetic field, it was found that the former produces more than twice the thermal effect under similar experimental conditions.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Physics, Applied
Jiaxin Li, Ying Li, Tianlong Li, Wuyi Wang, Longqiu Li, Cheng-Wei Qiu
PHYSICAL REVIEW APPLIED
(2019)
Article
Nanoscience & Nanotechnology
Xiaocong Chang, Chuanrui Chen, Jinxing Li, Xiaolong Lu, Yuyan Liang, Dekai Zhou, Haocheng Wang, Guangyu Zhang, Tianlong Li, Joseph Wang, Longqiu Li
ACS APPLIED MATERIALS & INTERFACES
(2019)
Article
Chemistry, Multidisciplinary
Tieyan Si, Xian Zou, Zhiguang Wu, Tianlong Li, Xin Wang, Krasnyuk Ivan Ivanovich, Qiang He
CHEMISTRY-AN ASIAN JOURNAL
(2019)
Article
Engineering, Electrical & Electronic
Qi Gong, Weiwei Zhang, Yufeng Su, Kun Zhang
INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS
(2020)
Article
Chemistry, Analytical
Xiaolong He, Tianlong Li, Jia Zhang, Zhenlong Wang
Article
Chemistry, Multidisciplinary
Fengtong Ji, Tianlong Li, Shimin Yu, Zhiguang Wu, Li Zhang
Summary: The study introduces a model to regulate the motion of a swinging flexible nanomotor driven by an oscillating magnetic field, analyzing the coupling of magnetic actuation and the swinging pattern of SFNs. The experiment demonstrates the mobility of SFNs and successfully traps a living neutrophil for in vitro transportation.
Article
Chemistry, Analytical
Tao Zhang, Yuguo Deng, Bo Zhou, Jiayu Liu, Yufeng Su, Mu Li, Weiwei Zhang
Summary: Swarming robotic systems derived from insect swarms demonstrate high environmental adaptability and enhanced tasking capabilities. A strategy to reconfigure paramagnetic nanoparticles into microswarm was proposed, where reversible transformations between disk, ellipse, and ribbon shapes were achieved through programmed sawtooth magnetic field. The system also allowed for splitting, merging, steering in any direction, and successful combination of microparts into complete assemblies.
Article
Materials Science, Multidisciplinary
S. Yu, T. Li, F. Ji, S. Zhao, K. Liu, Z. Zhang, W. Zhang, Y. Mei
Summary: This paper presents a magnetic trimer-like microrobot composed of three magnetic Janus colloids with different diameters, which exhibits multimodal locomotion, reconfigurability, and contactless manipulation. The locomotion modes can be achieved by adjusting the magnetic field, enabling the microrobot to move in a 3D space and on a surface. Rapid reconfiguration of the microrobot from one mode to another can be achieved by changing the frequency and strength of the magnetic field.
MATERIALS TODAY ADVANCES
(2022)
Article
Chemistry, Multidisciplinary
Zhanxiang Zhang, Haocheng Wang, Hua Yang, Wenping Song, Lizhou Dai, Shimin Yu, Xuejia Liu, Tianlong Li
Summary: A highly effective contrast enhancer for accurate diagnosis is in great demand in clinics. This study introduces a new strategy using deformable and manipulatable magnetic microswarm as MRI contrast enhancer. The magnetic microswarm, composed of aggregated nanoparticles, demonstrates the ability to exhibit various behaviors and adapt to different terrains. Experimental results in an intestinal model show that the magnetic microswarm significantly enhances T-2-weighted MRI sequences.
CHEMISTRY-AN ASIAN JOURNAL
(2022)
Article
Physics, Multidisciplinary
Jiaxin Li, Zhanxiang Zhang, Guoqiang Xu, Haoran Sun, Lizhou Dai, Tianlong Li, Cheng-Wei Qiu
Summary: This article reports a method of rectifying diffusion-wave fields by modulating conductivity and observing nonreciprocal transport of charges. A spatiotemporal diffusion metamaterial is created experimentally, achieving mode transition and generating a direct current component.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Weiwei Zhang, Yuguo Deng, Jinhao Zhao, Tao Zhang, Xiang Zhang, Wenping Song, Lin Wang, Tianlong Li
Summary: By controlling the directional flow of protoplasm, amoeba can produce temporary pseudopods in any direction to perform important life activities. Creating robotic systems with pseudopodia to emulate environmental adaptability and tasking capabilities of natural amoeba remains challenging.
Article
Multidisciplinary Sciences
Tianlong Li, Shimin Yu, Bei Sun, Yilong Li, Xinlong Wang, Yunlu Pan, Chunlei Song, Yukun Ren, Zhanxiang Zhang, Kenneth T. V. Grattan, Zhiguang Wu, Jie Zhao
Summary: Swimming microrobots guided in the circulation system have great potential in precision medicine. A new design of swimming microrobots with clawed geometry, red blood cell (RBC) membrane-camouflaged surface, and magnetically actuated retention is discussed. The microrobots showed effective magnetic propulsion and active retention even against a flow of 2.1 cm/s, indicating promising biomedical applications.
