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| 1 | Sodium Alginate/Carboxyl-Functionalized Graphene Composite Hydrogel Via Neodymium Ions Coordination显示文摘A facile method for the preparation of sodium alginate(SA)/carboxyl-functionalized graphene(G-COOH)composite hydrogel was developed. Based on the coordination ability of lanthanide ions to the carboxyl groups, a series of hydrogel derived from different ratios of SA and G-COOH was fabricated by neodymium(Nd^(3+)) ions coordination. A relatively uniform layered structure was recorded by SEM at the interior of SA/G-COOH hydrogel. Several parameters such as water content, swelling ratio(SR), tensile test and solvent resistance were also investigated. The SA/G-COOH composite hydrogel showed excellent mechanical strength, and the tensile strength of SA/G-COOH composite hydrogel reaches 53.72 MPa at high water content. Due to the coordination ability of Nd^(3+) ions, the hydrogel also exhibited an excellent solvent resistance and stability. | Qianqian Huang Shunli Liu Kewen Li Imtiaz Hussain Fang Yao Guodong Fu | 2017 | Journal of Materials Science & Technology2017，33，8： | 4 |
| 2 | Observation of magnetic droplets in magnetic tunnel junctions显示文摘Magnetic droplets,a class of highly nonlinear magnetodynamic solitons,can be nucleated and stabilized in nanocontact spintorque nano-oscillators.Here we experimentally demonstrate magnetic droplets in magnetic tunnel junctions(MTJs).The droplet nucleation is accompanied by power enhancement compared with its ferromagnetic resonance modes.The nucleation and stabilization of droplets are ascribed to the double-Co Fe B free-layer structure in the all-perpendicular MTJ,which provides a low Zhang-Li torque and a high pinning field.Our results enable better electrical sensitivity in fundamental studies of droplets and show that the droplets can be utilized in MTJ-based applications and materials science. | Kewen Shi Wenlong Cai Sheng Jiang Daoqian Zhu Kaihua Cao Zongxia Guo Jiaqi Wei Ao Du Zhi Li Yan Huang Jialiang Yin Johan Akerman Weisheng Zhao | 2022 | Science China(Physics,Mechanics & Astronomy)2022，65，2： | 0 |
| 3 | Spintronics intelligent devices显示文摘Intelligent computing paradigms have become increasingly important for the efficient processing of massive amounts of data.However,using traditional electronic devices to implement these intelligent paradigms is currently mismatched and limited by their energy,area,and speed.Spintronics,which exploits the magnetic and electrical properties of electrons,could break through these limitations and bring new possibilities to electrical devices.In particular,the tunneling magnetoresistance effect,merging quantum and spintronics,enables spintronic devices to be compatible with standard integrated circuits with a magnetic tunnel junction(MTJ)design,showing great potential for implementing hardware-based intelligent frameworks.In this review,we introduce the specific capabilities of MTJs,including nonvolatility,stochasticity,plasticity,and nonlinearity,which are highly favorable in artificial intelligence algorithms.We then present how these devices could impact the development of intelligent computing,including in-memory computing,probabilistic computing,and neuromorphic computing.Finally,we discuss their challenges and perspectives in intelligent hardware implementations. | Wenlong Cai Yan Huang Xueying Zhang Shihong Wang Yuanhao Pan Jialiang Yin Kewen Shi Weisheng Zhao | 2023 | Science China(Physics,Mechanics & Astronomy)2023，66，11： | 0 |
| 4 | A direct laser-synthesized magnetic metamaterial for low-frequency wideband passive microwave absorption显示文摘Microwave absorption in radar stealth technology is faced with challenges in terms of its effectiveness in low-frequency regions.Herein,we report a new laser-based method for producing an ultrawideband metamaterial-based microwave absorber with a highly uniform sheet resistance and negative magnetic permeability at resonant frequencies,which results in a wide bandwidth in the L-to S-band.Control of the electrical sheet resistance uniformity has been achieved with less than 5%deviation at 400Ωsq^(-1)and 6%deviation at 120Ωsq^(-1),resulting in a microwave absorption coefficient between 97.2%and 97.7%within a1.56–18.3 GHz bandwidth for incident angles of 0°–40°,and there is no need for providing energy or an electrical power source during the operation.Porous N-and S-doped turbostratic graphene 2D patterns with embedded magnetic nanoparticles were produced simultaneously on a polyethylene terephthalate substrate via laser direct writing.The proposed low-frequency,wideband,wide-incident-angle,and high-electromagnetic-absorption microwave absorber can potentially be used in aviation,electromagnetic interference(EMI)suppression,and 5G applications. | Yihe Huang Yize Li Kewen Pan Yixian Fang Kai Chio Chan Xiaoyu Xiao Chao Wei Kostya S Novoselov John Gallop Ling Hao Zhu Liu Zhirun Hu Lin Li | 2023 | International Journal of Extreme Manufacturing2023，5，3： | 0 |
| 5 | Vertical graphene-coated Cu wire for enhanced tolerance to high current density in power transmission显示文摘Cu wires(CuWs)are widely used as electric transmission lines.However,their limited thermal and chemical stabilities become challenges under the high-power and harsh environment.Graphene is regarded as an ideal protective barrier for CuW benefiting from its impermeability to all atoms and molecules.Particularly,the excellent hydrophobicity of vertical graphene(VG)will strengthen its protective capability as a corrosion and oxidation barrier.Herein,VG is directly synthesized on CuW by plasmaenhanced chemical vapor deposition method.The hydrophobic VG coating with a high water contact angle can effectively exclude the corrosive liquid and moisture from CuW surface and prevent their further penetration.Consequently,the electrochemical corrosion rate of VG-CuW is reduced by~13,8,and 2 times,compared with bare CuW,VG-CuW with hydrophilic treatment,and CuW coated with thick horizontal graphene layers,respectively.Negligible oxidation occurs on VGCuW after the long-time exposure to humid air at~200℃ along with the largely enhanced tolerance under high-current operating condition.This study reveals the impressive potentials of hydrophobic VG as a robust corrosion and oxidation barrier for metal wires used in high-power cables and electronic devices in harsh environment. | Kun Wang Shuting Cheng Qingmei Hu Feng Yu Yi Cheng Kewen Huang Hao Yuan Jun Jiang Wenjuan Li Junliang Li Shichen Xu Jianbo Yin Yue Qi Zhongfan Liu | 2022 | Nano Research2022，15，11： | 0 |
| 6 | TUNNEL INTERFERENCE IN UNSTEADY POST-STALL EXPERIMENTS显示文摘TUNNELINTERFERENCEINUNSTEADYPOST┐STALLEXPERIMENTSZhangWenhua,DingKewen,HuangDa,LiZhiqiang,ZhangQingli(6thDept.NanjingUniversi... | Zhang Wenhua, Ding Kewen, Huang Da, Li Zhiqiang, Zhang Qingli (6th Dept. Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China) | 1997 | Chinese Journal of Aeronautics1997，10，4： | 0 |
| 7 | Implementation of 16 Boolean logic operations based on one basic cell of spin-transfer-torque magnetic random access memory显示文摘In-memory computing(IMC)systems based on emerging nonvolatile memories(NVMs)provide a thorough solution for memory wall issues and von Neumann bottlenecks.Massive IMC schemes have been proposed by utilizing ingenious structures and additional auxiliary components.However,these schemes are not compatible with the basic cell(one memory unit and one transistor)of emerging random-access memory(RAM),which goes against low-power and high-density requirements.In this paper,we propose a logic implementation scheme based on one magnetic tunnel junction and one transistor(1MTJ-1T),which is the basic cell of spin-transfer-torque magnetic RAM(STT-MRAM).With no other assistance,complete 16 logic operations can be accomplished in two steps with their logic outputs in-situ stored in the MTJ.The area(0.2μm^(2))and energy consumption per logic operation(1.1-2.6 pJ)of the logic gates under 14 nm process node are evaluated using SPICE simulations,indicating its excellent performance.Our work exhibits a 1MTJ-1Tbased logic operation implementation,which can bridge the gap between STT-MRAM and high-performance IMC applications. | Yan HUANG Kaihua CAO Kun ZHANG Jinkai WANG Kewen SHI Zuolei HAO Wenlong CAI Ao DU Jialiang YIN Qing YANG Junfeng LI Jianfeng GAO Chao ZHAO Weisheng ZHAO | 2023 | Science China(Information Sciences)2023，66，6： | 0 |
| 8 | Mechanism of field-like torque in spin-orbit torque switching of perpendicular magnetic tunnel junction显示文摘The current-induced spin-orbit torque(SOT) is one of the most promising ways for high speed and low power spintronics devices. However, the mechanism of SOT driven magnetization reversal, especially the role of the field-like torque(FLT), is still unclear. Here, we report the observed promotion and suppression of switching by FLT, which depends on the relative direction of FLT and spin polarization. Our results reveal that the FLT could modulate the switching speed and power consumption by affecting the work done by the damping-like torque, and leads two different reversal dynamical paths during the switching.Furthermore, the origin of incubation time in SOT induced switching is clarified simultaneously. | Yudong Zhuo Wenlong Cai Daoqian Zhu Hongchao Zhang Ao Du Kaihua Cao Jialiang Yin Yan Huang Kewen Shi Weisheng Zhao | 2022 | Science China(Physics,Mechanics & Astronomy)2022，65，10： | 0 |
| 9 | Bubble dynamics characteristics and influencing factors on the cavitation collapse intensity for self-resonating cavitating jets显示文摘Based on bubble dynamics theory, a mathematic model describing the cavitation bubble size variation in the flow field of self-resonating cavitating jet was developed considering the pressure field and mass and heat exchange between cavitation bubble and ambient fluid. With this model, the influence factors on the cavitation intensity are investigated. The results show that the destructiveness of cavitating jet in breaking rocks depends on the bubble's first collapse, with decreasing intensity in the subsequent collapses. The self-resonating effect significantly enhances the cavitation intensity by promoting the collapse pressure and elongating its duration. Hydraulic parameters are proven to be the dominating factors influencing cavitation intensity: while collapse intensity monotonously increases with jet velocity, there exists an optimum ambient pressure where highest collapse intensity can be achieved. Conversely, the fluid properties show minor influences: cavitation intensity only slightly decreases with the increasing of fluid's density and barely changes with the variation of viscosity and surface tension. The results from this investigation help to uncover the mechanism of the enhanced erosion potential of self-resonating cavitating jet. The conclusions can be used to further improve the performance of self-resonating cavitating jet in field applications. | PENG Kewen TIAN Shouceng LI Gensheng HUANG Zhongwei YANG Ruiyue GUO Zhaoquan | 2018 | Petroleum Exploration and Development2018，45，2： | 0 |
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