Article
Mechanics
Bohan Wang, Weiquan Jiang, Guoqian Chen
Summary: This paper compares the distribution and dispersion of micro-swimmers with and without convective inertial torque in a two-dimensional vertical channel flow, while incorporating other effects such as shear-shape interaction and wall accumulation. The results show the importance of convective inertial torque in the orientational dynamics of micro-swimmers and its impact on their macroscopic transport properties.
Article
Mechanics
Zehua Liu, Linfeng Jiang, Chao Sun
Summary: This study investigates the dynamics of gyrotactic swimmers in turbulence and explores the effects of swimming velocity and gyrotactic stability on spatial accumulation and alignment. Using numerical simulations and Voronoi analysis, it is found that the preferential sampling of clusters and voids is more pronounced, and the clustering behavior is influenced by the gyrotaxis strength and swimming velocity. Additionally, the study reveals that the Lagrangian alignment is affected by both the gyrotaxis strength and swimming velocity.
Article
Engineering, Multidisciplinary
Ya-Nan Gao, Ye Wang, Tian-Ning Yue, Ming Wang
Summary: Electromagnetic shielding materials with high electromagnetic shielding effectiveness (EMW SE) values were successfully prepared by combining hollow silver micro-tubes and magnetic nano-barium ferrites. The electromagnetic parameters and impedance matching of the composites could be easily regulated by changing the ratio of silver micro-tubes and nano-barium ferrites.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Engineering, Marine
Shun Huang, Dilong Guo, Yiwei Wang, Guowei Yang, Bo Yin
Summary: This paper investigates the effects of posterior body morphology on the propulsion performance of thunniform swimmers through numerical simulations. It is found that the interaction between posterior body vortices and leading edge vortices of the caudal fin can significantly enhance the fin's thrust, especially with increasing height of the posterior body. Moreover, reducing the width of the posterior body can help decrease the trunk drag. These findings contribute to the understanding of tuna fish propulsion mechanism and provide guidance for designing biomimetic swimming devices.
Article
Multidisciplinary Sciences
Assad Ayub, Syed Zahir Hussain Shah, Muahmmad Imran Asjad, Musawa Yahya Almusawa, Sayed M. Eldin, Magda Abd El-Rahman
Summary: The study of biological interactions of micro swimmers in a complex wavy canal with MHD effects is important for understanding the behavior and dynamics of microorganisms in natural environments with complex fluid flow and magnetic fields. This study investigates the interactions between micro swimmers and Cross fluid with inclined MHD effects in a complex wavy canal. Factors such as medium nature, magnetic field, liquid rheology, and position play a role in these interactions. The study provides insights into swimming speed enhancement, power dissipation reduction, and the effective role of cross fluid rheology in swimming motion.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Multidisciplinary
Shanhe Gong, Shaokang Yang, Wenbo Wang, Runqing Lu, Haotan Wang, Xu Han, Guilong Wang, Jimin Xie, Dewei Rao, Chundu Wu, Jun Liu, Shouyan Shao, Xiaomeng Lv
Summary: A new electrostatic induced self-assembly strategy is developed for encapsulating isolated Ni-C3N1 moiety into hollow nano-reactor, which enhances the catalytic activity for electrocatalytic CO2 reduction reaction. The excellent activity of I-Ni SA/NHCRs is attributed to its hollow nano-reactor structure and unique Ni-C3N1 moiety, which promotes the adsorption and activation of CO2 molecule. This strategy also enables the encapsulation of isolated iron and cobalt sites into nano-reactor, and a zinc-CO2 battery based on I-Ni SA/NHCRs achieves a peak power density of 2.54 mW cm-².
Article
Robotics
Johan E. Quispe, Aude Bolopion, Pierre Renaud, Stephane Regnier
Summary: The study focuses on optimizing the performance of helical swimmers in low Reynolds number environments, including swimming and pumping tasks. Through numerical simulation, the research aims to serve as a guiding reference for building optimal helical structures.
IEEE ROBOTICS AND AUTOMATION LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Alice Kirvin, David Gregory, Andrew Parnell, Andrew I. Campbell, Stephen Ebbens
Summary: The ability to generate rotation in ellipsoidal catalytic micro swimming devices by catalyst deposition at glancing angles allows reliable access to circling trajectories, enabling propulsive ellipsoids to gather cargo and enhance mixing at small scales. The inherent anisotropy of ellipsoids in this work removes the requirement for a closely packed colloidal crystal monolayer, leading to shadowing effects during catalyst deposition. Geometric analysis and mechanistic understanding are used to propose a link between observed trajectories and catalyst distribution in order to improve control of rotation rates.
MATERIALS ADVANCES
(2021)
Article
Materials Science, Multidisciplinary
Claudio Cazorla, Riccardo Rurali
Summary: This study predicts the magnetophononic effects in materials undergoing antiferromagnetic (AFM) <-> ferromagnetic (FM) phase transitions, allowing for tuning of the thermal conductivity of crystals by applying magnetic fields. Using first-principles methods, a significant and anomalous increase of approximate to 40% in the lattice heat conductivity kappa(L) is predicted for the metamagnetic phase transition in bulk FeRh near room temperature. These effects are attributed to large anharmonic spin-phonon couplings causing significant differences in the phase space of allowed phonon-phonon collision processes in the respective AFM and FM phases.
Article
Engineering, Chemical
Alex Hamilton, Yang Xu, Mehmet E. Kartal, Nikolaj Gadegaard, Daniel M. Mulvihill
Summary: The potential of improving mechanical properties of adhesive joints through micro-structured interlocking features was investigated. Results showed that micro-structuring the interface led to significant increases in strength and work to failure, attributed to mechanical interlocking of features. This was achieved by progressive bending of interlocking features, allowing for a higher total load compared to planar roughened surfaces.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2021)
Article
Chemistry, Multidisciplinary
Guo Tian, Weili Deng, Da Xiong, Tao Yang, Binbin Zhang, Xiarong Ren, Boling Lan, Shen Zhong, Long Jin, Hongrui Zhang, Lin Deng, Weiqing Yang
Summary: This study proposes a strategy to enhance the piezoelectric performance of polyamide framework materials using well-aligned MXene nanosheets and successfully synthesizes MXene/PVDF composites with excellent performance. Additionally, the modified model of the piezo-composite helps to further understand the interfacial polarization and dielectric relaxation effect in piezoelectric composites.
CELL REPORTS PHYSICAL SCIENCE
(2022)
Article
Chemistry, Applied
Yi Zhang, Yan Wang, Zhilong He, Siyuan Li, Tong Shan, Lei Zhu, Hongliang Zhong
Summary: This study investigates the effect of non-covalent interaction on the photostability of narrow-bandgap non-fullerene acceptors (NFAs). By designing and synthesizing compounds with different configurations, it is found that non-covalent interaction can improve the photostability of NFAs. This is a promising approach.
Review
Materials Science, Multidisciplinary
Jinan Liu, Yiqiang Fu, Xiongjun Liu, Haihui Ruan
Summary: This paper summarizes the historical achievements in understanding the dynamic behaviors of natural and artificial micro-swimmers, focusing on flagellated micro-swimmers and their propulsion mechanisms. It reviews progress in actuation strategies of artificial micro-swimmers and proposes two possible strategies for steering a flagellated micro-swimmer, discussing inadequacies in current research and providing insights for future developments.
ACTA MECHANICA SOLIDA SINICA
(2021)
Article
Physics, Multidisciplinary
Zeeshan Asghar, Nasir Ali, Khurram Javid, Muhammad Waqas, Waqar Azeem Khan
Summary: This study investigates the motion characteristics of soft nano-robots in a fluid environment and their regulatory effects on the reproductive system. Key parameters such as the speed of active swimmers in the fluid and the work done by microorganisms are obtained, and numerical simulation and analytical solutions are used to study the dynamic equilibrium conditions.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Physics, Applied
L. Liang, W. Tong, H. J. Wang, L. M. Peng
Summary: Considerable interest has been shown in improving the magnetocaloric properties of NiMnGa ferromagnetic shape memory alloys. In this study, we combined Dy micro-alloying and pseudoelastic cyclic training to enhance the magnetic entropy change and broaden the working temperature interval. The introduction of Dy elements established a stable magneto-structural coupling transformation, resulting in a large magnetic entropy change and widened working temperature interval. The internal strain fields at phase interfaces assisted phase transformation nucleation and significantly reduced hysteresis loss. Pseudoelastic cyclic training produced a preferred crystallographic orientation, facilitating magnetic alignment and achieving a giant magnetic entropy change and effective refrigeration capacity.
APPLIED PHYSICS LETTERS
(2023)
