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MXene Hybridized Polymer with Enhanced Electromagnetic Energy Harvest for Sensitized Microwave Actuation and Self-Powered Motion Sensing

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NANO-MICRO LETTERS 2025年第1期17卷 1-15页

作者： Wang, Yu-Ze Wang, Yu-Chang Liu, Ting-Ting zhao, quan-Liang Li, Chen-Sha Cao, Mao-Sheng Beijing Inst Technol Sch Mat Sci & Engn Beijing 100081 Peoples R China Peking Univ Sch Mat Sci & Engn Beijing 100871 Peoples R China North China Univ Technol Sch Mech & Mat Engn Beijing 100144 Peoples R China Heilongjiang Univ Minist Educ Peoples Republ China Key Lab Funct Inorgan Mat Chem Harbin 150080 Peoples R China

Polymeric microwave actuators combining tissue-like softness with programmable microwave-responsive deformation hold great promise for mobile intelligent devices and bionic soft robots. However, their application is challenged by restricted electromagnetic sensitivity and intricate sensing coupling. In this study, a sensitized polymeric microwave actuator is fabricated by hybridizing a liquid crystal polymer with Ti3C2Tx (MXene). Compared to the initial counterpart, the hybrid polymer exhibits unique space-charge polarization and interfacial polarization, resulting in significant improvements of 230% in the dielectric loss factor and 830% in the apparent efficiency of electromagnetic energy harvest. The sensitized microwave actuation demonstrates as the shortened response time of nearly 10 s, which is merely 13% of that for the initial shape memory polymer. Moreover, the ultra-low content of MXene (up to 0.15 wt%) benefits for maintaining the actuation potential of the hybrid polymer. An innovative self-powered sensing prototype that combines driving and piezoelectric polymers is developed, which generates real-time electric potential feedback (open-circuit potential of similar to 3 mV) during actuation. The polarization-dominant energy conversion mechanism observed in the MXene-polymer hybrid structure furnishes a new approach for developing efficient electromagnetic dissipative structures and shows potential for advancing polymeric electromagnetic intelligent devices.

关键词： Microwave absorption Electromagnetic response Energy harvest Self-sensing Soft actuator

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AN ENERGY-STABLE PARAMETRICFINITE ELEMENT METHOD FOR SIMULATING SOLID-STATE DEWETTING PROBLEMS INTHREE DIMENSIONS

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Journal of Computational Mathematics 2023年第4期41卷 771-796页

作者： Weizhu Bao quan zhao Department of Mathematics National University of SingaporeSingapore119076

We propose an accurate and energy-stable parametric finite element method for solving the sharp-interface continuum model of solid-state dewetting in three-dimensional *** model describes the motion of the film/vapor interface with contact line migration and is governed by the surface diffusion equation with proper boundary conditions at the contact *** present a weak formulation for the problem,in which the contact angle condition is weakly *** using piecewise linear elements in space and backward Euler method in time,we then discretize the formulation to obtain a parametric finite element approximation,where the interface and its contact line are evolved *** resulting numerical method is shown to be well-posed and unconditionally ***,the numerical method is generalized to the case of anisotropic surface energies in the Riemannian metric *** results are reported to show the convergence and efficiency of the proposed numerical method as well as the anisotropic effects on the morphological evolution of thin films in solid-state dewetting.

关键词： Solid-state dewetting Surface diffusion Contact line migration Contact angle Parametric finite element method Anisotropic surface energy

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Reversible Plasticity Shape Memory Effect in SEBS/Crystallizable Paraffin: Influence of Paraffin Content

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Chinese Journal of Polymer Science 2022年第12期40卷 1697-1705,I0011页

作者： Shao-quan zhao Jia-Chun Feng State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai 200433China Yiwu Research Institute of Fudan University Yiwu 322000China

Polymers with reversible plasticity shape memory effect(RPSME)have attracted considerable attention due to their simple programming and large ***,the exact mechanisms of RPSME are still not thoroughly *** this work,the RPSME of SEBS/crystallizable paraffin was investigated by comparatively analyzing the performances and microstructures of samples with different paraffin *** was found the shape fixing ratios(Rfs)of samples increased with the paraffin content,and interestingly,a significant improvement in Rf was observed when the paraffin content exceeded 60 wt%.Tensile test results showed that the deformation characteristics of samples changed from elastic to plastic as the paraffin content increased above 60 wt%.By exploring the crystallization behaviors of paraffin in various SEBS/paraffin samples,it was revealed that the microstructures of SEBS/paraffin were different when the paraffin content was below 50 wt%and above 60 wt%.In samples with low paraffin content(below 50 wt%),nearly all paraffin was co-crystallized with ethylene-co-butylene(EB)chains and its crystallization was severely restricted;while in samples with high paraffin content(above 60 wt%),“excess”paraffin appeared and this part of paraffin crystallized on the template of the EB/paraffin co-crystals,which might be responsible for the elastic-to-plastic transition and the sharp increase in *** on the above results,a possible structural model was proposed to explain the exact mechanism of RPSME in SEBS/paraffin.

关键词： Reversible plasticity shape memory effect Poly(styrene-b-(ethylene-co-butylene)-b-styrene) Crystallizable paraffin Paraffin content

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Gold modified microelectrode for direct tetracycline detection

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Frontiers of Environmental Science & Engineering 2012年第3期6卷 313-319页

作者： Hongtao WANG Huimin zhao Xie quan Key Laboratory of Industrial Ecology and Environmental Engineering (MOE) School of Environmental Science and Technology Dalian University of Technology Dalian 116024 China

The residues of tetracycline antibiotics in water have attracted many concerns due to their harmful impact to human health. This paper reports an electrochemical sensor for the determination of tetracycline (TC) by the microelectrode, which was fabricated by electrodeposited gold colloids on tungsten tip. Cyclic voltammerty was used to study the electrochemical behavior of TC on the microelectrode. Well anodic wave was obtained at about 1.5 V in acidic solutions. Electrochemical determination of tetracycline was investigated using microelectrode by cyclic voltammetry. Under optimized conditions, the calibration curves for TC were obtained. The oxidation peak currents were linearly related to TC concentrations in the range of 1–10 mg·L?1 and 10–100 mg·L?1, respectively. The detection limit was 0.09 mg·L?1 (S/N = 3).

关键词： microelectrode tungsten tip gold colloids tetracycline

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Traveling waves in nonlocal diffusion systems with delays and partial quasi-monotonicity

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Applied Mathematics(A Journal of Chinese Universities) 2011年第4期26卷 464-482页

作者： XU zhao-quan WENG Pei-xuan Department of Mathematics South China Normal University Gungzhou 510631 China.

This paper is devoted to the study of a three-dimensional delayed system with nonlocal diffusion and partial quasi-monotonicity. By developing a new definition of upper-lower solutions and a new cross iteration scheme, we establish some existence results of traveling wave solutions. The results are applied to a nonlocal diffusion model which takes the three-species Lotka-Volterra model as its special case.

关键词： Traveling wave nonlocal diffusion partial quasi-monotonicity upper and lower solution cross iteration scheme.

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Effect of mating status on the fecundity of a cricket, Teleogryllus emma

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Insect Science 2011年第3期18卷 320-324页

作者： LQ-quan zhao Dao-Hong Zhu College of Forestry Central South University of Forestry & Technology Central South University of Forestry & Technology Changshe China Hunan First Normal University Central South University of Forestry & Technology Changshe China College of Life Science and Technology Central South University of Forestry & Technology Changshe China

Fecundity in some insects is affected by mating status. The effect of mating status on the fecundity and total egg production of Teleogryllus emma （Ohmachi et Matsumura）（Orthoptera： Gryllidae） was examined in this study. The results showed that the pre-oviposition period was shorter for amphigonic females than that for virgin females. However, no significant difference in pre-oviposition was found between amphigonic females and those that had mated with a male with either the phallodeum or testes extirpated. There is no difference in adult longevity between the above four groups. The fecundity and total egg production were much higher in amphigonic females than in those controlled under the three non-amphigonic treatments. The females of T. emma that mated with the testes-extirpated males produced more eggs （up to two-fold more） than both the virgin females and those that mated with the phallodeum-extirpated males, but there was no difference between them. The fecundity-enhancing substances transferred from male to female can stimulate the female to produce more eggs, but this stimulation has to occur in collaboration with sperm.

关键词： fecundity mating status pre-oviposition Teleogryllus emma total egg production

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Ruptured intracranial aneurysm presenting as cerebral circulation insufficiency:A case report

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World Journal of Clinical Cases 2021年第22期9卷 6380-6387页

作者： Long zhao Shuang-quan zhao Xiao-Ping Tang Department of Neurosurgery The Affiliated Hospital of North Sichuan Medical CollegeNanchong 637000Sichuan ProvinceChina Department of Emergency Medicine The Affiliated Hospital of North Sichuan Medical CollegeNanchong 637000Sichuan ProvinceChina

BACKGROUND Rupture of an intracranial aneurysm is a type of acute stroke that is a serious threat to human *** of ruptured intracranial aneurysms is a serious clinical event that may have disastrous consequences in some *** date,ruptured intracranial aneurysms have been misdiagnosed as meningitis,tumors,stroke,or trauma,among other ***,we report what appears to be the first case of a ruptured intracranial aneurysm that presented as cerebral circulation *** SUMMARY A middle-aged man was admitted to our hospital because of a parasellar lesion identified on a noncontrast computed tomography(CT)image after a mild traffic accident that was caused by a brief loss of ***,he was diagnosed with cerebral circulation insufficiency after two unexplained episodes of a transient loss of consciousness within the past 8 *** patient was diagnosed with right internal carotid artery aneurysm based on CT angiography and completely recovered after a craniotomy at our hospital.A few clots and severe adhesions around the aneurysm were observed in the subarachnoid space during the operation,suggesting that the aneurysm had ruptured and may had been misdiagnosed as cerebral circulation *** Ruptured intracranial aneurysms may show negative imaging results and present as cerebral circulation insufficiency,which should be recognized as soon as possible to ensure timely management.

关键词： Intracranial aneurysm Misdiagnosis Cerebral circulation insufficiency Case

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quantum quenches in the Dicke model:Thermalization and failure of the generalized Gibbs ensemble

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Chinese Physics B 2020年第12期29卷 198-204页

作者： Xiao-Qiang Su You-quan zhao College of Physics and Information Engineering ShanXi Normal UniversityLinfen 041004China

quantum quenches in the Dicke model were studied both in the thermodynamic limit and the finite *** the integrable situation in the thermodynamic limit,the generalized Gibbs ensemble can effectively describe the energylevel occupations for the quench within the normal phase,but it fails for the quench to the superradiant *** the finite systems which are considered non-integrable,the post quench systems were studied by comparing with the thermal *** canonical ensembles are directly available for the quench within the normal *** the increasing of the target coupling strength over the equilibrium phase transition critical point,sudden changes take place for the effective temperature and the distance to the thermal *** thermalization was also studied by comparing with the results of the microcanonical ensembles.

关键词： quantum quench generalized Gibbs ensemble thermalization Dicke model

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A Level Set Method for the Simulation of Moving Contact Lines in Three Dimensions

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Communications in Computational Physics 2022年第10期32卷 1310-1331页

作者： quan zhao Shixin Xu Weiqing Ren Department of Mathematics National University of SingaporeSingapore119076 Zu Chongzhi Center for Mathematics and Computational Sciences Duke Kunshan University8 Duke AveKunshanJiangsuChina

We propose an efficient numerical method for the simulation of the twophase flows with moving contact lines in three *** mathematical model consists of the incompressible Navier-Stokes equations for the two immiscible fluids with the standard interface conditions,the Navier slip condition along the solid wall,and a contact angle condition(Ren et al.(2010)[28]).In the numerical method,the governing equations for the fluid dynamics are coupledwith an advection equation for a level-set *** latter models the dynamics of the fluid *** the standard practice,the interface conditions are taken into account by introducing a singular force on the interface in themomentum *** results in a single set of governing equations in the whole fluid ***,the contact angle condition is imposed by introducing a singular force,which acts in the normal direction of the contact line,into theNavier slip *** newboundary condition,which unifies the Navier slip condition and the contact angle condition,is imposed along the solid *** model is solved using the finite difference *** results are presented for the spreading of a droplet on both homogeneous and inhomogeneous solid walls,as well as the dynamics of a droplet on an inclined plate under gravity.

关键词： Level set method two-phase flow moving contact line dynamic contact angle Navier boundary condition

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Effects of the Antiferromagnetic Spin Coupling and Interdot Coulomb Repulsion on Kondo Effects in Serial Double quantum Dots

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Chinese Physics Letters 2014年第4期31卷 139-142页

作者： LI Zeng-Peng WU Shao-quan zhao Guo-Ping College of Physics and Electronic Engineering Siehuan Normal University Chengdu 610086

We theoretically study the effects of the antiferromagnetic （AF） spin coupling and the interdot Coulomb repulsion on the Kondo effects in serial double quantum dots by means of the slave-boson mean-field approximation. Our results indicate that in the weak coupling regime, the AF spin coupling strengthens the Kondo resonance, while the interdot Coulomb repulsion suppresses them for the equilibrium case. In the non-equilibrium case, the AF spin coupling strengthens the Kondo resonance only when J 〉 2.5TK0, while the interdot Coulomb repulsion does not suppress Kondo peaks. In the strong coupling regime, the bias voltage has no effects on the Kondo resonance in this system, and the AF spin coupling increases the height of Kondo peaks only when J 〈 2.5TK0. However, the inter-dot Coulomb repulsion suppresses the spin Kondo effect, which induces the orbit Kondo effect. Moreover, the relevant underlying physics of these problems are discussed.

关键词： ANTIFERROMAGNETIC resonance SPIN-spin interactions COULOMB potential KONDO effect quanTUM dots

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