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中药补气活血方离子导入配合穴位按摩治疗糖尿病周围神经病变效果观察 预览
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作者 田君义 尤鲁山 张文广 《世界中医药》 CAS 2020年第1期116-119,共4页
目的:探讨中药离子导入联合穴位按摩应用在糖尿病周围神经病变的临床疗效及应用价值。方法:选取2016年1月至2018年10月西宁市城北区中医院收治的糖尿病周围神经病变210例作为研究对象,按照治疗方案不同分为对照组和观察组,每组105例,对... 目的:探讨中药离子导入联合穴位按摩应用在糖尿病周围神经病变的临床疗效及应用价值。方法:选取2016年1月至2018年10月西宁市城北区中医院收治的糖尿病周围神经病变210例作为研究对象,按照治疗方案不同分为对照组和观察组,每组105例,对照组给予西医基础治疗,观察组在对照组基础上联合中药离子导入与穴位按摩治疗,比较2组治疗效果。结果:观察组患者治疗总有效率为97.14%显著高于对照组的86.67%,组间比较差异有统计学意义(P<0.05)。观察组治疗后肢体麻木评分(1.53±0.11)分,肢体疼痛评分(1.34±0.12)分,倦怠乏力评分(1.23±0.14)分,手足畏寒评分(1.33±0.14)分;对照组疗后肢体麻木评分(2.06±0.38)分,肢体疼痛评分(1.96±0.34)分,倦怠乏力评分(1.84±0.37)分,手足畏寒评分(1.85±0.32)分,组间比较差异有统计学意义(P<0.05)。观察组治疗后尺神经传导速度(51.68±3.75)m/s,胫神经传导速度(39.96±2.98)m/s,腓总神经传导速度(38.43±2.88)m/s;对照组治疗后尺神经传导速度(45.32±2.86)m/s,胫神经传导速度(37.04±2.41)m/s,腓总神经传导速度(35.06±2.19)m/s,组间比较差异有统计学意义(P<0.05)。结论:中药离子导入联合穴位按摩应用在糖尿病周围神经病变可以提升临床疗效,改善神经传导素,减轻临床症状评分,值得在临床推广应用。 展开更多
关键词 中药 离子 导入 穴位 按摩 糖尿病 周围神经 疗效
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Bi2S3 for Aqueous Zn Ion Battery with Enhanced Cycle Stability 预览
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作者 Ting Xiong Yinming Wang +3 位作者 Bosi Yin Wen Shi Wee Siang Vincent Lee Junmin Xue 《纳微快报:英文版》 CAS CSCD 2020年第1期93-101,共9页
Aqueous Zn ion batteries(ZIBs)are promising in energy storage due to the low cost,high safety,and material abundance.The development of metal oxides as the cathode for ZIBs is limited by the strong electrostatic force... Aqueous Zn ion batteries(ZIBs)are promising in energy storage due to the low cost,high safety,and material abundance.The development of metal oxides as the cathode for ZIBs is limited by the strong electrostatic forces between O2−and Zn2+which leads to poor cyclic stability.Herein,Bi2S3 is proposed as a promising cathode material for rechargeable aqueous ZIBs.Improved cyclic stability and fast diffusion of Zn2+is observed.Also,the layered structure of Bi2S3 with the weak van der Waals interaction between layers offers paths for diffusion and occupancy of Zn2+.As a result,the Zn/Bi2S3 battery delivers high capacity of 161 mAh g−1 at 0.2 A g−1 and good cycling stability up to 100 cycles with ca.100%retention.The battery also demonstrates good cyclic performance of ca.80.3%over 2000 cycles at 1 A g−1.The storage mechanism in the Bi2S3 cathode is related to the reversible Zn ion intercalation/extraction reactions and the capacitive contribution.This work indicates that Bi2S3 shows great potential as the cathode of ZIBs with good performance and stability. 展开更多
关键词 AQUEOUS Zn ion battery BI2S3 Good stability
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不同盐对木薯淀粉结构的影响 预览
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作者 樊艳叶 林日辉 +4 位作者 杨慧 周丽红 曾艺君 黄彩梅 刘悦 《食品与发酵工业》 CAS CSCD 北大核心 2020年第3期84-89,共6页
为研究不同盐对木薯淀粉结构的影响,利用LiCl、LiNO3、CaCl2和Ca(NO3)2的醇溶液处理木薯淀粉,并通过扫描电子显微镜(scanning electron microscopy,SEM)、激光共聚焦显微镜(confocal laser scanning microscopy,CLSM)、X-射线衍射仪(X-r... 为研究不同盐对木薯淀粉结构的影响,利用LiCl、LiNO3、CaCl2和Ca(NO3)2的醇溶液处理木薯淀粉,并通过扫描电子显微镜(scanning electron microscopy,SEM)、激光共聚焦显微镜(confocal laser scanning microscopy,CLSM)、X-射线衍射仪(X-ray diffraction,XRD)、傅里叶变换红外光谱仪(fourier transform infrared spectroscopy,FTIR)以及同步热分析仪对处理淀粉进行表征,并对直链淀粉含量(amylose content,AM)进行检测。结果表明:虽然盐/醇处理后的木薯淀粉仍维持其颗粒的完整性,但其内部结构受到严重破坏。处理淀粉的晶型未受到破坏,但其相对结晶度按LiNO3、LiCl、Ca(NO3)2到CaCl2的顺序依次降低。盐/醇处理使淀粉在3424和1645cm^-1处的FTIR峰向低波数方向移动。此外,与原淀粉相比,除LiNO3处理的淀粉的直链淀粉含量增高外,其余的样品均降低。而处理淀粉的最大分解温度均低于原木薯淀粉,其降低顺序与其相对结晶度降低顺序相符。综上可知,在乙醇溶液中,不同盐对木薯淀粉结构的影响存在明显的差异性,而通过两两对比可知,Ca^2+对木薯淀粉的作用强于锂离子,而Cl^-则强于NO3^-。 展开更多
关键词 木薯淀粉 结构 盐/醇溶液 离子
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干旱胁迫下不同品种杨树矿质离子含量变化 预览
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作者 朱桐 金华 +4 位作者 邹吉祥 李新林 金纯伊 程文琼 刘思佳 《中南林业科技大学学报》 CAS CSCD 北大核心 2020年第2期102-107,共6页
【目的】了解杨树在干旱胁迫下矿质离子分布及其动态变化。【方法】以吴屯杨、新疆杨和荷兰杨为实验材料,在中度和重度干旱条件下测定了根、茎、叶和质外体的K^+、Ca^2+、Na^+和Mg^2+等4种离子含量的变化。【结果】干旱胁迫使K^+、Ca^2+... 【目的】了解杨树在干旱胁迫下矿质离子分布及其动态变化。【方法】以吴屯杨、新疆杨和荷兰杨为实验材料,在中度和重度干旱条件下测定了根、茎、叶和质外体的K^+、Ca^2+、Na^+和Mg^2+等4种离子含量的变化。【结果】干旱胁迫使K^+、Ca^2+和Na^+离子含量上升,Mg^2+含量下降,其中K^+和Ca^2+含量自胁迫开始明显升高,Na^+含量则在中度胁迫之后明显增加。离子在各器官分布情况为:K^+主要分布于杨树的叶片,Ca^2+、Na^+和Mg^2+主要分布于杨树根部,且离子分布存在品种间差异,荷兰杨和新疆杨中K^+分布为:叶>根>茎,而吴屯杨体内K^+分布则为:叶>茎>根;3种杨树中Ca^2+分布均为:根>叶>茎;吴屯杨和荷兰杨中Na^+分布为:根>茎>叶,新疆杨则为:根>叶>茎;在Mg^2+的分布上吴屯杨和新疆杨较为类似即:根>叶>茎,而荷兰杨为叶>根>茎。【结论】干旱胁迫下杨树首选吸收的离子是K^+和Ca^2+,K^+主要分布在杨树的叶片中,其次是根部,Ca^2+主要分布在杨树的根部。重度干旱胁迫下,杨树开始吸收Na^+,储存在杨树的根部。不同品种杨树之间离子的分布和吸收都存在品种差异。质外体作为离子的运输通道,在各干旱条件下运输4种矿质离子至杨树的其他部位,Mg^2+存在滞留在质外体中的情况。本研究可为植物在干旱胁迫下矿质离子吸收和分布的研究提供理论依据。 展开更多
关键词 干旱 杨树 离子 动态变化
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Facile Fabrication of Fe3O4@TiO2@C Yolk–Shell Spheres as Anode Material for Lithium Ion Batteries 预览
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作者 Wenming Liao Zhongqiang Shan Jianhua Tian 《天津大学学报:英文版》 EI CAS 2020年第1期3-12,共10页
Transition metal oxides have been actively exploited for application in lithium ion batteries due to their facile synthesis,high specific capacity,and environmental-friendly.In this paper,Fe3O4@TiO2@C yolk-shell(Y-S)s... Transition metal oxides have been actively exploited for application in lithium ion batteries due to their facile synthesis,high specific capacity,and environmental-friendly.In this paper,Fe3O4@TiO2@C yolk-shell(Y-S)spheres,used as anode material for lithium ion batteries,were successfully fabricated by Stober method.XRD patterns reveal that Fe3O4@TiO2@C Y-S spheres possess a good crystallinity.But the diffraction peaks’intensity of Fe3O4 crystals in the composites is much weaker than that of bare Fe3O4 spheres,indicating that the outer anatase TiO2@C layer can cover up the diffraction peaks of inner Fe3O4 spheres.The yolk-shell structure of Fe3O4@TiO2@C spheres is further characterized by TEM,HAADFSTEM,and EDS mapping.The yolk-shell structure is good for improving the cycling stability of the inner Fe3O4 spheres during lithium ions insertion-extraction processes.When tested at 200 mA/g,the Fe3O4@TiO2@C Y-S spheres can provide a stable discharge capacity of 450 mAh/g over 100 cycles,which is much better than that of bare Fe3O4 spheres and TiO2@C spheres.Furthermore,cyclic voltammetry curves show that the composites have a good cycling stability compared to bare Fe3O4 spheres. 展开更多
关键词 Fe3O4@TiO2@C yolk-shell spheres Cycle performance Lithium ion batteries Anode material
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Upstream proton cyclotron waves:occurrence and amplitudedependence on IMF cone angle at Mars from MAVEN observations 预览
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作者 Di Liu ZhongHua Yao +6 位作者 Yong Wei ZhaoJin Rong LiCan Shan Stiepen Arnaud Espley Jared HanYing Wei WeiXing Wan 《地球与行星物理:英文版》 CSCD 2020年第1期51-61,共11页
Proton cyclotron waves(PCWs)can be generated by ion pickup of Martian exospheric particles in the solar wind.The solar wind ion pickup process is highly dependent on the“IMF cone angle”—the angle between the solar ... Proton cyclotron waves(PCWs)can be generated by ion pickup of Martian exospheric particles in the solar wind.The solar wind ion pickup process is highly dependent on the“IMF cone angle”—the angle between the solar wind velocity and the interplanetary magnetic field(IMF),which also plays an important role in the generation of PCWs.Using data from 2.15 Martian years of magnetic field measurements collected by the Mars Atmosphere and Volatile Evolution(MAVEN)mission,we have identified 3307 upstream PCW events.Their event number distribution decreases exponentially with their duration.A statistical investigation of the effects of IMF cone angle on the amplitudes and occurrence rates of PCWs reveals a slight tendency of PCWs’amplitudes to decrease with increasing IMF cone angle.The relationship between the amplitude and IMF cone angle is weak,with a correlation coefficient r=–0.3.We also investigated the influence of IMF cone angle on the occurrence rate of PCWs and found that their occurrence rate is particularly high for intermediate IMF cone angles(~18°–42°)even though highly oblique IMF orientation occurs most frequently in the upstream region of the Martian bow shock.We also conclude that these variabilities are not artefacts of temporal coverage biases in MAVEN sampling.Our results demonstrate that whereas IMF cone angle strongly influences the occurrence of PCWs,IMF cone angle may also weakly modulate their amplitudes in the upstream region of Mars. 展开更多
关键词 ion pickup proton cyclotron waves Martian exosphere
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Ion-vacancy coupled charge transfer model for ion transport in concentrated solutions
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作者 Yu Gao Jun Huang +3 位作者 Yuwen Liu Jawei Yan Bingwei Mao Shengli Chen 《中国科学:化学英文版》 SCIE EI CAS CSCD 2019年第4期515-520,共6页
We present a conceptual framework for understanding and formulating ion transport in concentrated solutions,which pictures the ion transport as an ion-vacancy coupled charge transfer reaction.A key element in this pic... We present a conceptual framework for understanding and formulating ion transport in concentrated solutions,which pictures the ion transport as an ion-vacancy coupled charge transfer reaction.A key element in this picture is that the transport of an ion from an occupied to unoccupied site involves a transition state which exerts double volume exclusion.An ab initio random walk model is proposed to describe this process.Subsequent coarse-graining results in a continuum formula as a function of chemical potentials of the constituents,which are further derived from a lattice-gas model.The subtlety here is that what has been taken to be the chemical potential of the ion in the past is actually that of the ion-vacancy couple.By aid of this new concept,the driving force of ion transport is essentially the chemical affinity of the ion-vacancy coupled charge transfer reaction,which is a useful concept to unify transport and reaction,two fundamental processes in electrochemistry.This phenomenological model is parameterized for a specific material by the aid of first-principles calculations.Moreover,its extension to multiple-component systems is discussed. 展开更多
关键词 concentrated solutions ION dynamics ION volume effect chemical affinity ion-vacancy COUPLE
Basic Steps in Chemical Dissociation of Gaseous Molecules Using an Even-Odd Rule, a Specifically Adapted Periodic Table and a Covalent Bonding Rule 预览
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作者 Geoffroy Auvert 《物理化学期刊(英文)》 2019年第2期88-105,共18页
When writing equations of chemical dissociation, students and scholars are taught two fundamental rules to balance the equation. On both sides of the equation, the types of elements and their quantity are conserved, a... When writing equations of chemical dissociation, students and scholars are taught two fundamental rules to balance the equation. On both sides of the equation, the types of elements and their quantity are conserved, as well as the global electrical charge. This paper introduces additional methods during dissociation of gaseous compounds, to precisely describe how electrical charges locally move and how bonding structures are modified. Specific rules revolving around electrons pairs displacements are developed and applied to about 150 dissociations of small gaseous molecules using atoms from the three first rows of the periodic table. Results obtained tend to demonstrate the relevance of these tools for chemists. 展开更多
关键词 Chemistry COVALENT BONDS Even-Odd RULE COVALENT RULE MOLECULE DISSOCIATION Gas Charge Position Ion Periodic Table
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Close up observation and inversion of low-altitude ENA emissions during a substorm event
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作者 Li LU Susan MCKENNA-LAWLOR Jan BALAZ 《中国科学:地球科学英文版》 SCIE EI CAS CSCD 2019年第6期1024-1032,共9页
During a series of substorm events on November 12 2004, the Neutral Atom Detector Unit(NUADU) flying onboard the TC-2 spacecraft observed, close to perigee, bright low-altitude Energetic Neutral Atom(ENA) emissions fr... During a series of substorm events on November 12 2004, the Neutral Atom Detector Unit(NUADU) flying onboard the TC-2 spacecraft observed, close to perigee, bright low-altitude Energetic Neutral Atom(ENA) emissions from both north and south poles. Through utilizing high temporal and spatial resolution data inversion techniques we present here a global view the associated processes of energetic ion deposition and injection at the uniquely high temporal resolution of a few minutes. It is demonstrated that the ENA emissions observed came mainly from the, low-altitude, high magnetic latitude polar region. Since precipitating ions follow magnetic field lines and have more chance to produce ENA emissions through charge exchange there.Therefore, the employment of a low-orbit satellite to record at high temporal and spatial resolution ENA image data is inferred to be the best way to monitor those dynamic ring current variations that occur during geomagnetic activity. 展开更多
关键词 LOW-ALTITUDE ENA EMISSIONS ENA image INVERSION Pitch angle distribution ION injection ION deposition
Cellular and Molecular Mechanisms Underlying Arterial Baroreceptor Remodeling in Cardiovascular Diseases and Diabetes
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作者 Huiyin Tu Dongze Zhang Yu-Long Li 《神经科学通报:英文版》 SCIE CAS CSCD 2019年第1期98-112,共15页
Clinical trials and animal experimental studies have demonstrated an association of arterial baroreflex impairment with the prognosis and mortality of cardiovascular diseases and diabetes. As a primary part of the art... Clinical trials and animal experimental studies have demonstrated an association of arterial baroreflex impairment with the prognosis and mortality of cardiovascular diseases and diabetes. As a primary part of the arterial baroreflex arc, the pressure sensitivity of arterial baroreceptors is blunted and involved in arterial baroreflex dysfunction in cardiovascular diseases and diabetes.Changes in the arterial vascular walls, mechanosensitive ion channels, and voltage-gated ion channels contribute to the attenuation of arterial baroreceptor sensitivity. Some endogenous substances(such as angiotensin II and superoxide anion) can modulate these morphological and functional alterations through intracellular signaling pathways in impaired arterial baroreceptors. Arterial baroreceptors can be considered as a potential therapeutic target to improve the prognosis of patients with cardiovascular diseases and diabetes. 展开更多
关键词 Cardiovascular disease DIABETES BAROREFLEX BARORECEPTOR Vascular wall MECHANOSENSITIVE ION CHANNELS Voltage-gated ION CHANNELS Angiotensin Superoxide Nuclear factor-kappa B
Nitrogen and Phosphorus Dual-Doped Multilayer Graphene as Universal Anode for Full Carbon-Based Lithium and Potassium Ion Capacitors 预览
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作者 Yuting Luan Rong Hu +6 位作者 Yongzheng Fang Kai Zhu Kui Cheng Jun Yan Ke Ye Guiling Wang Dianxue Cao 《纳微快报:英文版》 CAS CSCD 2019年第2期166-178,共13页
Lithium/potassium ion capacitors(LICs/PICs) have been proposed to bridge the performance gap between high-energy batteries and high-power capacitors.However,their development is hindered by the choice,electrochemical ... Lithium/potassium ion capacitors(LICs/PICs) have been proposed to bridge the performance gap between high-energy batteries and high-power capacitors.However,their development is hindered by the choice,electrochemical performance,and preparation technique of the battery-type anode materials.Herein,a nitrogen and phosphorus dual-doped multilayer graphene(NPG) material is designed and synthesized through an arc discharge process,using low-cost graphite and solid nitrogen and phosphorus sources.When employed as the anode material,NPG exhibits high capacity,remarkable rate capability,and stable cycling performance in both lithium and potassium ion batteries.This excellent electrochemical performance is ascribed to the synergistic effect of nitrogen and phosphorus doping,which enhances the electrochemical conductivity,provides a higher number of ion storage sites,and leads to increased interlayer spacing.Full carbon-based NPG‖LiPF6‖active carbon(AC) LICs and NPG‖KPF6‖AC PICs are assembled and show excellent electrochemical performance,with competitive energy and power densities.This work provides a route for the large-scale production of dual-doped graphene as a universal anode material for high-performance alkali ion batteries and capacitors. 展开更多
关键词 Arc discharge GRAPHENE HETEROATOM doping Lithium/potassium ION battery Lithium/potassium ION capacitor
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The lithium and sodium storage performances of phosphorus and its hierarchical structure
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作者 Dan Zhao Lihui Zhang +2 位作者 Chengcheng Fu Jinying Zhang Chunming Niu 《纳米研究:英文版》 SCIE EI CAS CSCD 2019年第1期1-17,共17页
Recent preparation of black phosphorene and subsequent discovery of its excellent optical and electronic properties have attracted great attenti on,and ren ewed interest to phosphorus.Rece nt researches have indicated... Recent preparation of black phosphorene and subsequent discovery of its excellent optical and electronic properties have attracted great attenti on,and ren ewed interest to phosphorus.Rece nt researches have indicated that phosphorus structures are promisi ng an odes for lithium-ion and sodium-ion batteries.A high theoretical capacity of 2,596 mAh·g^-1 was predicted for phosphorus according to the reaction of 3Li/Na+P→Li3P/Na3P.However,fast capacity degradation is accompanying with most phosphorus structures due to the low electronic conductivity and structural pulverization induced by large volume change in charging and discharging proceses.The electrochemical performances are significantly affected by the hierarchical structural design of phosphorus.A few reviews of phosphorus structures have been reported recent?However,no review about the electrochemical performances of phosphorus structures according to their hierarchical structures has been reported.First of all,phosphrus allotropes along with their structure and fundamental properties are briefly reviewed in this work.Secondly,the studies on lithiation/sodiation mechanism of red/black phosphorus are presented.Thirdly,a summary about the electrochemical performances of red/black phosphorus composites with different hierarchical structures is presented.Furthermore,the,development challenges and future perspectives of phosphorus structures as anodes for LIBs and SIBs are discussed. 展开更多
关键词 LITHIUM ION BATTERIES SODIUM ION BATTERIES PHOSPHORUS COMPOSITES PHOSPHORUS structures review
Quantum-confined ion superfluid in nerve signal transmission
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作者 Xiqi Zhang Lei Jiang 《纳米研究:英文版》 SCIE EI CAS CSCD 2019年第6期1219-1221,共3页
We propose a process of quantum-confined ion superfluid (QISF),which is enthalpy-driven confined ordered fluid,to explain the transmission of nerve signals.The ultrafast Na^+ and K^+ ions transportation through all so... We propose a process of quantum-confined ion superfluid (QISF),which is enthalpy-driven confined ordered fluid,to explain the transmission of nerve signals.The ultrafast Na^+ and K^+ ions transportation through all sodium-potassium pump nanochannels simultaneously in the membrane is without energy loss,and leads to QISF wave along the neuronal axon,which acts as an information medium in the ultrafast nerve signal transmission.The QISF process will not only provide a new view point for a reasonable explanation of ultrafast signal transmission in the nerves and brain,but also challenge the theory of matter wave for ions,molecules and particles. 展开更多
关键词 NERVE signal transmission quantum-confined ION SUPERFLUID action potential ION CHANNELS matter wave
Ion current rectification:from nanoscale to microscale
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作者 Tianyi Xiong Kailin Zhang +2 位作者 Yanan Jiang Ping Yu Lanqun Mao 《中国科学:化学英文版》 SCIE EI CAS CSCD 2019年第10期1346-1359,共14页
Ion current rectification(ICR)is an electrodynamic phenomenon in electrolyte solution which is defined as the asymmetric potential-dependent ion flux through a confined environment,giving rise to asymmetric electrical... Ion current rectification(ICR)is an electrodynamic phenomenon in electrolyte solution which is defined as the asymmetric potential-dependent ion flux through a confined environment,giving rise to asymmetric electrical current-voltage characteristics induced by the influence of an asymmetric electrical double layer structure.Since the discovery of the ICR phenomenon,the observation and application of ICR at nanoscale and microscale have been widely investigated experimentally and theoretically.Here,the recent progress of ICR from nanoscale to microscale is systematically reviewed.Nano/micropore structures of different materials,shapes and pore sizes are first discussed.Then,the factors influencing ICRs by thermodynamically or kinetically regulating the electrical double layer structure are introduced.Moreover,theoretical models are presented to explain the mechanism of ICRs.Based on the understanding of this phenomenon,the applications,especially in biosensors,are discussed.Finally,future developments of this area are briefly presented.This review covers the representative related literature published since 2010 and is intended to give a systematic introduction to this area. 展开更多
关键词 ION current RECTIFICATION ION transport NANOPORE NANOCHANNEL micropipette
SnS2@C Hollow Nanospheres with Robust Structural Stability as High?Performance Anodes for Sodium Ion Batteries 预览
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作者 Shuaihui Li Zhipeng Zhao +2 位作者 Chuanqi Li Zhongyi Liu Dan Li 《纳微快报:英文版》 CAS CSCD 2019年第1期241-249,共9页
Constructing unique and highly stable structures with plenty of electroactive sites in sodium storage materials is a key factor for achieving improved electrochemical properties through favorable sodium ion di usion k... Constructing unique and highly stable structures with plenty of electroactive sites in sodium storage materials is a key factor for achieving improved electrochemical properties through favorable sodium ion di usion kinetics.An SnS2@carbon hollow nanospheres(SnS2@C)has been designed and fabricated via a facile solvothermal route,followed by an annealing treatment.The SnS2@C hybrid possesses an ideal hollow structure,rich active sites,a large electrode/electrolyte interface,a shortened ion transport pathway,and,importantly,a bu er space for volume change,generated from the repeated insertion/extraction of sodium ions.These merits lead to the significant reinforcement of structural integrity during electrochemical reactions and the improvement in sodium storage properties,with a high specific reversible capacity of 626.8 mAh g-1 after 200 cycles at a current density of 0.2 A g-1 and superior high-rate performance(304.4 mAh g-1 at 5 A g-1). 展开更多
关键词 SnS2@C HOLLOW NANOSPHERES ANODE materials SODIUM ion BATTERIES
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Metal–Oleate Complex?Derived Bimetallic Oxides Nanoparticles Encapsulated in 3D Graphene Networks as Anodes for Efficient Lithium Storage with Pseudocapacitance 预览
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作者 Yingying Cao Kaiming Geng +6 位作者 Hongbo Geng Huixiang Ang Jie Pei Yayuan Liu Xueqin Cao Junwei Zheng Hongwei Gu 《纳微快报:英文版》 CAS CSCD 2019年第1期250-263,共14页
In this manuscript,we have demonstrated the delicate design and synthesis of bimetallic oxides nanoparticles derived from metal–oleate complex embedded in 3D graphene networks(MnO/CoMn2O4?GN),as an anode material for... In this manuscript,we have demonstrated the delicate design and synthesis of bimetallic oxides nanoparticles derived from metal–oleate complex embedded in 3D graphene networks(MnO/CoMn2O4?GN),as an anode material for lithium ion batteries.The novel synthesis of the MnO/CoMn2O4?GN consists of thermal decomposition of metal–oleate complex containing cobalt and manganese metals and oleate ligand,forming bimetallic oxides nanoparticles,followed by a selfassembly route with reduced graphene oxides.The MnO/CoMn2O4?GN composite,with a unique architecture of bimetallic oxides nanoparticles encapsulated in 3D graphene networks,rationally integrates several benefits including shortening the diffusion path of Li+ions,improving electrical conductivity and mitigating volume variation during cycling.Studies show that the electrochemical reaction processes of MnO/CoMn2O4?GN electrodes are dominated by the pseudocapacitive behavior,leading to fast Li+charge/discharge reactions.As a result,the MnO/CoMn2O4?GN manifests high initial specific capacity,stable cycling performance,and excellent rate capability. 展开更多
关键词 Metal–oleate complex Bimetallic oxides NANOPARTICLES Porous architecture 3D GRAPHENE NETWORKS Lithium ion batteries
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Thickness evolution of graphite-based cathodes in the dual ion batteries via in operando optical observation 预览
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作者 Na Li Yaoda Xin +4 位作者 Haosen Chen Shuqiang Jiao Hanqing Jiang Wei-Li Song Daining Fang 《能源化学:英文版》 SCIE EI CAS CSCD 2019年第2期122-128,共7页
Graphite has been currently considered as a promising cathode material in dual ion batteries(DIBs)due to its unique features of sp2 hybridized carbon and stacked two-dimensional layered structures.However,unexpected v... Graphite has been currently considered as a promising cathode material in dual ion batteries(DIBs)due to its unique features of sp2 hybridized carbon and stacked two-dimensional layered structures.However,unexpected volume/thickness changes in the graphite cathodes,induced by the intercalation/deintercalation of anions with large molecular size have been known to be a critical problem in designing DIB cells.To understand the volume/thickness changes in the DIB electrodes,in operando optical observing apparatus has been employed to observe the cross-section view of a graphite-based cathode upon cycles in the present work.The observation suggests that the cathode initially presented a huge irreversible thickness change(60%),and such thickness variation was prone to reduce and remain <20% in the following cycles.The results from both in operando observation and electrochemical characterizations collectively indicate that the greater thickness variation at initial cycle should be attributed to both anion intercalation into graphite-based cathodes and irreversible decomposition of chemical components in the DIB system.The method here highlights a universal route for fundamentally understanding the electrodes of huge volume variation. 展开更多
关键词 DUAL ion BATTERIES In OPERANDO optical observation GRAPHITE CATHODE Thickness EVOLUTION
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Flexible quasi-solid-state dual-ion asymmetric supercapacitor based on Ni(OH)2 and Nb2O5 nanosheet arrays 预览
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作者 Xiaolan Deng Yuqi Jiang +6 位作者 Zengxi Wei Minglei Mao Ramyakrishna Pothu Hongxia Wang Caiyun Wang Jinping Liu Jianmin Ma 《绿色能源与环境:英文版》 CSCD 2019年第4期382-390,共9页
Increasing the energy density,power density as well as widening the operation voltage are essential to electrochemical capacitors to meet the practical energy demands.Herein,a novel flexible quasi-solid-state dual-ion... Increasing the energy density,power density as well as widening the operation voltage are essential to electrochemical capacitors to meet the practical energy demands.Herein,a novel flexible quasi-solid-state dual-ion asymmetric supercapacitor(ASC)with Ni(OH)2 and Nb2O5 nanosheets directly grown on stainless steel mesh is developed.In the dual-ion ASC,Nb2O5 negative and Ni(OH)2 positive electrodes react with Lit and OHrespectively in alkaline gel electrolyte to store energy,which is quite different from conventional alkali metal ion SCs and alkaline SCs.The as-assembled flexible device has an extended working voltage of 1.7 Vand delivers a capacity of 5.37 mAh cm^-2,a maximum energy density and power density of 0.52 mWh cm^-3 and 170 mW cm^-3,respectively.The device maintains around 60%capacity retention after long cycling up to 1000 cycles.Moreover,our device can light up a LED light efficiently upon fast charging.The proposed quasi-solid-state dual-ion ASC has potential applications in future portable electronics and flexible energy storage devices. 展开更多
关键词 Nickel hydroxide Niobium pentoxide NANOARRAYS Flexible supercapacitor Dual ion capacitor
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Aluminum,titanium and oxygen control during electroslag remelting of stainless steel based on thermodynamic analysis
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作者 Dong Hou Zhou-hua Jiang +3 位作者 Tian-peng Qu De-yong Wang Fu-bin Liu Hua-bing Li 《钢铁研究学报:英文版》 SCIE EI CAS CSCD 2019年第1期20-31,共12页
Experimental investigation and thermodynamic calculation were carried out to study the effect of slag on alloying elements during electroslag remelting with developing a thermodynamic model to control titanium and alu... Experimental investigation and thermodynamic calculation were carried out to study the effect of slag on alloying elements during electroslag remelting with developing a thermodynamic model to control titanium and aluminum in in got.The thermodynamic model based on ion and molecule coexistence theory and conservation law of element atoms was established to analyze the change in aluminum and titanium along the height of ingot.The results show that low CaO slag is suitable for electroslag remelting of metal containing high titanium-to-aluminum ratio.As electroslag remelting process consists of slag temperature-rising and temperature-stable periods,TiO2 should be added into water-cooled copper mold during temperature-rising period in order to keep the thermodynamic equilibrium between titanium and aluminum,and the amount of TiO2 is the difference value calculated by the reaction between titanium and alumina at 1477 and 1677℃. 展开更多
关键词 ELECTROSLAG REMELTING TITANIUM CONTROL ALUMINUM CONTROL Oxygen CONTROL Stainless steel Thermodynamic analysis Ion and molecule COEXISTENCE theory
Facile synthesis of rutile TiO2/carbon nanosheet composite from MAX phase for lithium storage
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作者 Zhaoruxin Guan Xiaoxue Wang +3 位作者 Tingting Li Qizhen Zhu Mengqiu Jia Bin Xu 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2019年第9期1977-1981,共5页
Titanium oxide(TiO2),with excellent cycling stability and low volume expansion,is a promising anode material for lithium-ion battery(LIB),which suffers from low electrical conductivity and poor rate capability.Combini... Titanium oxide(TiO2),with excellent cycling stability and low volume expansion,is a promising anode material for lithium-ion battery(LIB),which suffers from low electrical conductivity and poor rate capability.Combining nano-sized TiO2 with conductive materials is proved an efficient method to improve its electrochemical properties.Here,rutile TiO2/carbon nanosheet was obtained by calcinating MAX(Ti3AlC2)and Na2C03 together and water-bathing with HC1.The lamellar carbon atoms in MAX are converted to 2D carbon nanosheets with urchin-like rutile TiO2 anchored on.The unique architecture can offer plentiful active sites,shorten the ion diffusion distance and improve the conductivity.The composite exhibits a high reversible capacity of 247 mA h g^-1,excellent rate performance(38 mA h g^-1 at 50 C)and stable cycling performance(0.014%decay per cycle during 2000 cycles)for lithium storage. 展开更多
关键词 TiO2/C COMPOSITE ANODE LITHIUM ion battery MAX
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