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中国科学:技术科学（英文版）
中国科学:技术科学（英文版）

周光召

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中国科学:技术科学（英文版）/Journal Science China Technological SciencesCSCDCSTPCDEISCI
查看更多>>《中国科学》是中国科学院主办、中国科学杂志社出版的自然科学专业性学术刊物。《中国科学》任务是反映中国自然科学各学科中的最新科研成果，以促进国内外的学术交流。《中国科学》以论文形式报道中国基础研究和应用研究方面具有创造性的、高水平的和有重要意义的科研成果。在国际学术界，《中国科学》作为代表中国最高水平的学术刊物也受到高度重视。国际上最具有权威的检索刊物SCI，多年来一直收录《中国科学》的论文。1999年《中国科学》夺得国家期刊奖的第一名。
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    Preface

    MA Tian-BaoSONG AiSheng
    1979页
      原文链接:
    • 万方数据
    • 维普

    Research progress on rolling superlubricity in solid lubricants

    LI PanPanLI HongXuanZHU DongXiangZHU YongQi...
    1980-1990页
    查看更多>>摘要：Superlubricity is an ideal lubrication state where friction nearly vanishes between contact interfaces.It has become one of the most important research topics and approaches owing to its significance in reducing energy consumption and preventing device failures.As an efficient and universal lubricating principle capable of achieving superlubricity,rolling lubrication has attracted widespread attention in recent years.In this review,the theoretical concept of rolling lubrication and the experimental research progress of spherical/scroll structures are summarized.The review focuses on the possibility of achieving rolling lubrication using spherical/scroll structures(such as spherical fullerenes,carbon nanotubes,and formed and constructed spherical/scroll structures).The challenges in achieving rolling lubrication are summarized,and the possibility of molecular rolling lubrication,as well as its potential applications in superlubrication,are discussed.
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    • 万方数据
    • 维普

    Combined effect of WS2 and Ti3C2Tx MXene favors oil-based ultra-low friction on rough steel-steel interface at elevated temperatures

    LIU YangQinCHEN LeiWANG YangQIAN LinMao...
    1991-2002页
    查看更多>>摘要：The lubrication performance of liquids is severely restricted and is degraded in high-temperature environments.Stable and reliable lubrication in high temperature environments has been a long-standing goal in various industrial fields.In this study,WS2 and Ti3C2Tx MXene nanoflakes were used as oil-based lubricant additives to generate ultra-low friction and even super-lubricity(friction coefficient of～0.007)at elevated temperatures(400℃),which has hitherto not been achieved by both individual pristine materials,WS2 and Ti3C2Tx MXene.Viscosity and thermogravimetric characterization revealed improve-ments in the high-temperature rheological properties and thermal stability of the lubricating base oil,indicating improved load-bearing and continuous lubrication capabilities at elevated temperatures.X-ray photoelectron spectroscopy,transmission electron microscopy,and atomic force microscopy demonstrated that the formation of an iron/titanium/tungsten-rich oxide lubricious thin film at the sliding interface reduced the interfacial shear stress,which was responsible for the observed friction and wear reductions at high contact pressures(＞1.1 GPa).Although the titanium/tungsten oxide film was gradually removed after prolonged sliding,a sufficiently thick iron oxide film maintained a low friction coefficient for at least 2 h.The improved surface quality facilitates the achievement of ultra-low friction and reduced wear.The proposed lubrication methodology has a broad utilization potential as a wear-reduction strategy across various industrial fields at elevated temperatures.
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    • 万方数据

    Study on the tribological properties of metal rolling bearing under lubrication with diketone lubricants

    DU ShaoNanZHANG ChenHuiLUO Zhi
    2003-2017页
    查看更多>>摘要：In this article,1-(4-ethylphenyl)-nonane-1,3-dione(0206)was prepared by Claisen condensation.By mixing 0206,chelate,and base oil in a ratio of 3.2∶4.8∶2,a diketone lubricant(PAO=14(20％))that can achieve superlubricity was prepared and applied to bearing lubrication experiments.The experimental results show that when the bearing was lubricated by base oil,the friction coefficient(COF)and temperature rise decreased with the decrease of the viscosity of PAO.When PAO=14(20％)was used as the lubricant,the COF of the bearing was the lowest(0.001),and the wear morphology was comparable to that of the bearing lubricated with commercial lubricant.Compared with the base oil with the same viscosity,it is found that the COF and temperature rise of the bearing lubricated by PAO=14(20％)were lower under any experimental conditions.And when the amount of lubricant added was 10 pL,the COF of the bearing lubricated by PAO=14(20％)reached a very low value(0.0004).Bearing ball surface analysis identified the formation of diketone adsorption films.Combined with the previous PAO=14(20％)superlubricity mechanism,it was considered that the occurrence of tribochemical reaction and the bearing effect of chelates were the main reasons for the existence of ultra-low friction coefficient and low wear.In addition,when there were polar molecules in the lubricant,they were adsorbed on the metal surface through tribochemical reactions,resulting in many irregular pits on the surface.
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    • 万方数据
    • 维普

    Exceptional mechanical performance and macroscale superlubricity enabled by core-shell-like MoS2/B4C film

    REN SiMingGAO ZhenRongFAN XinWANG HaiXin...
    2018-2030页
    查看更多>>摘要：Molybdenum disulfide(MoS2)films are widely deployed in industrial applications owing to their inherent interlayer slip characteristics,offering energy consumption savings and prolonged mechanical part performance.Nevertheless,their practical utility is limited by environmental constraints and the limitations of preparation techniques,which hinder the attainment of robust superlubricity(friction coefficient＜0.01).Herein,through magnetron sputtering technology,we synthesize a core-shell-like nanocomposite composed of MoS2 nanosheets encapsulating B4C.The core-shell-like structure enables the resulting films to preferentially grow crystalline MoS2,providing them with outstanding mechanical properties and efficient lubrication over a wide range of temperatures.Remarkably,such film achieves robust macroscale superlubricity and an ultralow wear rate(1.7 × 10-8mm3N-1m)under high contact stress in a mild vacuum environment.This noteworthy outcome is primarily attributable to the self-segmentation of the macroscale contact interface during the friction process,involving:(1)a large amount of wear debris is embedded into the wear track to create extensive micro-sized asperities;(2)a nanolayer of amorphous carbon enriched with oxide nanoparticles is formed on the uppermost part of these asperities;(3)numerous incommensurate nanocontacts comprising nanoparticles and highly oriented MoS2 nanosheets are established,culminating in the achievement of robust superlubricity.Our pioneering design,coupled with the elucidation of the underlying superlubricity mechanism,holds significant promise for advancing the development of robust and high-performance lubricants.
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    • 万方数据

    Rational design of robust and transparent superrepellent surfaces for long-term marine antifouling

    CHEN HuiWANG ZhiWANG DaHengXIAO Feng...
    2031-2039页
    查看更多>>摘要：Superhydrophobic surfaces have demonstrated exceptional efficacy in combatting biofouling contaminations of optical devices and equipment in marine applications.However,the fabrication of highly transparent superhydrophobic materials remains a formidable challenge due to the inherent trade-off between surface roughness for superhydrophobicity and optical transparency.Herein,we design a robust and transparent superhydrophobic coating(Si-POSS)embedded silica nanoparticles(200 nm)with fluorinated polyhedral oligomeric silsesquioxanes(F-POSS)and zinc pyrithione(ZPT).The Si-POSS coating exhibits excellent water repellence toward diverse liquids and optical transmittance exceeding 90％in the visible spectrum.Moreover,the Si-POSS coating sustains long-term anti-bacterial(＞99.11％)and anti-algal effects for over 30 days,accompanied by mechanical,chemical,and thermal stability.This research asserts that the Si-POSS coating with outstanding combined characteristics holds significant potential for marine applications,particularly in self-cleaning and antifouling endeavors.
      原文链接:
    • 万方数据
    • 维普

    Conductive edge-warping graphite mesas for robust structural superlubricity

    FENG WeiJiaLIU YingMA MingPENG DeLi...
    2040-2049页
    查看更多>>摘要：Structural superlubricity(SSL)refers to a state of ultralow friction and zero wear when two solid surfaces slide against each other.Recent investigations have identified amorphous carbon at the edge of the graphite mesa as the primary source of friction in such SSL systems.Here,the tensile stress of metal thin film is exploited to engineer vertically conductive edge-warping graphite mesas(EWGM).Through this approach,robust SSL performance is realized,demonstrated by sliding an 8 µm side length square EWGM on an atomically smooth Au substrate for 10000 cycles at a constant voltage of 1 mV.In this SSL system,differential friction coefficients lower than 1.5 × 10-4 are achieved,with static contact resistance between EWGM and Au substrate as low as 28 Ω and sliding contact resistance as low as 32 Ω.Moreover,the EWGM exhibits SSL behavior on polished Si wafer substrates.Furthermore,because of the no-edge contact with the substrate during sliding,friction is independent of the sliding speed of the EWGM.This study presents the first successful fabrication of conductive EWGM.Remarkably,in both EWGM-Au and EWGM-Si SSL systems,the measured frictions are more than one order of magnitude lower than those of ordinary self-retracting graphite mesas with no-edge warping,and no wear is observed during extended current-carrying sliding.Overall,these findings establish a solid groundwork for the future realization of macroscale conductive SSL systems.
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    • 万方数据
    • 维普

    Interfacial tribochemical kinetics:A new perspective on superlubricity of diamond-like carbon films

    CHEN WeiQiMA Tian-Bao
    2050-2052页
      原文链接:
    • 万方数据

    Concept,configuration,and application of on-board nanogrids for use in electric vehicles

    ZHAO BingLI YongWU FangWAN JiangHu...
    2053-2073页
    查看更多>>摘要：Against the backdrop of increasingly serious climate change,researchers are attempting to extend macroscale carbon reduction research to smaller scales.With the rapid development and widespread application of electric vehicles(EVs),an effective approach for carbon reduction based on EVs has the potential to be developed.To coordinate and manage the EV platform in diverse application scenarios,the concept of an on-board nanogrid(OBNG),in which a nanogrid is combined with the EV,is proposed and defined,and the characteristics summarized.A configuration that includes a physical layer with the on-board hardware system;an information layer for logical control,energy management,and communication coordination;and an application layer that can cope with different working environments is proposed.A detailed introduction to the basic architecture and management mode of each layer is provided along with information concerning the relevant technologies for coordinated operation.New ideas and approaches to improve the existing performance are proposed,and finally,combined with a back-ground of smart and low-carbon cities,major application scenarios are envisioned.
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    • 万方数据

    A study of novel real-time power balance strategy with virtual asynchronous machine control for regional integrated electric-thermal energy systems

    WANG RuiLI Ming-JiaWANG YiBoSUN QiuYe...
    2074-2086页
    查看更多>>摘要：The development of regional integrated electric-thermal energy systems(RIETES)is considered a promising direction for modem energy supply systems.These systems provide a significant potential to enhance the comprehensive utilization and efficient management of energy resources.Therein,the real-time power balance between supply and demand has emerged as one pressing concern for system stability operation.However,current methods focus more on minute-level and hour-level power optimal scheduling methods applied in RIETES.To achieve real-time power balance,this paper proposes one virtual asyn-chronous machine(VAM)control using heat with large inertia and electricity with fast response speed.First,the coupling time-scale model is developed that considers the dynamic response time scales of both electric and thermal energy systems.Second,a real-time power balance strategy based on VAM control can be adopted to the load power variation and enhance the dynamic frequency response.Then,an adaptive inertia control method based on temperature variation is proposed,and the unified expression is further established.In addition,the small-signal stability of the proposed control strategy is validated.Finally,the effectiveness of this control strategy is confirmed through MATLAB/Simulink and HIL(Hardware-in-the-Loop)experiments.
      原文链接:
    • 万方数据
    • 维普