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In situ probing of electron transfer at the dynamic MoS_(2)/graphene–water interface for modulating boundary slip

Nano Research 2024年第8期17卷 7513-7521页

作者： Yishu Han dameng liu State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China

The boundary slip condition is pivotal for nanoscale fluid *** research has primarily focused on simulating the interaction mechanism between the electronic structure of two-dimensional materials and slip of water at the nanoscale,raising the possibility for ultralow friction flow of water at the ***,experimentally elucidating electronic interactions at the dynamic solid–liquid interface to control boundary slip poses a significant *** this study,the crucial role of electron structures at the dynamic solid–liquid interface in regulating slip length was ***,the slip length of water on the molybdenum disulfide/graphene(MoS_(2)/G)heterostructure(100.9±3.6 nm)significantly exceeded that of either graphene(27.7±2.2 nm)or MoS_(2)(5.7±3.1 nm)*** was also analyzed how electron transfer significantly affected interface *** electrons played a crucial role in determining the type and proportion of excitons at both MoS_(2)–water and MoS_(2)/G–water ***,by applying voltage,distinct photoluminescence(PL)responses at static and dynamic interfaces were discovered,achieving a 5-fold modulation in PL intensity and a 2-fold modulation in the trion to exciton intensity *** electrons transfer from the top graphene to the bottom MoS_(2)at the MoS_(2)/G–water interface,reducing surface charge ***,the reduction of electrostatic interactions between the solid and water leads to an increased slip length of water on the MoS_(2)/G *** process aids in comprehending the origin of frictional resistance at the subatomic *** work establishes a foundation for actively controlling and designing of fluid transport at the nanoscale.

关键词： two-dimensional materials solid-liquid interface photoluminescence excitons electron transfer slip length

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Rapid thin-layer WS_(2) detection based on monochromatic illumination photographs

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Nano Research 2021年第3期14卷 840-845页

作者： Xiangmin Hu Cuicui Qiu dameng liu State Key Laboratory of Tribology Tsinghua UniversityBeijing100084China

The thickness of two-dimensional(2D)nanomaterials shows a significant effect on their optical and electrical ***,a rapid and automatic detection technology of 2D nanomaterials with desired layer-number is required to extend their practical application in optoelectronic *** this paper,an image recognition technology was proposed for rapid and reliable identification of thin-layer WS_(2) samples,which combining a layer-thickness identification criterion and a novel image segmentation *** criterion stemmed from optical contrast study of monochromatic illumination photographs,and the algorithm was based on Canny operator and edge connection *** optical identification method can seek out thin-layer WS_(2) samples on complex surfaces,which provides a promising approach for automatic search of thin-layer nanomaterials.

关键词： WS_(2) thickness identification image recognition sample detection

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Microstructure and mechanical properties of Ti Al Si N nano-composite coatings deposited by ion beam assisted deposition

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Science China(Technological Sciences) 2015年第10期58卷 1682-1688页

作者： SU Kang liu dameng SHAO TianMin State Key Laboratory of Tribology Tsinghua University

TiA1SiN nano-composite coatings with Silicon contents from 4.1 to 23.9 at.% were deposited on Silicon wafers. The nano- hardness, microstructure, and adhesion force of the coatings were deeply affected by Silicon contents. The TiA1SiN with 9.0 at.% Silicon has a maximum hardness of 40.9 GPa, a highest adhesion force of 67 N and a lowest friction coefficient of 0.5. Microstructures show that Silicon doping increases the hardness of coating due to solid solution hardening effect and grain boundary enhancement effect. The amorphous Si3N4 matrix, which contains （Ti,Al）N nano-crystals, is formed as the Silicon content is increased. The matrix contributes to the nano-hardness and helps to resist surface oxidization. Especially, the matrix induces low surface roughness and decreases the friction coefficient.

关键词： IBAD TiAISiN Nano-hardness microstructure mechanical properties

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Layer-dependent signatures for exciton dynamics in monolayer and multilayer WSe2 revealed by fluorescence lifetime imaging measurement

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Nano Research 2020年第3期13卷 661-666页

作者： Yuanshuang liu Huanglong Li Cuicui Qiu Xiangmin Hu dameng liu State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China Beijing Innovation Center for Future Chip Tsinghua UniversityBeijing 100084China

Two-dimensional(2D)transition-metal dichalcogenide(TMD)materials have aroused noticeable interest due to their distinguished electronic and optical ***,little is known about their complex exciton properties together with the exciton dynamics process which have been expected to influence the performance of optoelectronic *** process of fluorescence can well reveal the process of exciton transition after *** this work,the room-temperature layer-dependent exciton dynamics properties in layered WSe2 are investigated by the fluorescence lifetime imaging microscopy(FLIM)for the first *** paper focuses on two mainly kinds of excitons including the direct transition neutral excitons and *** with the lifetime of neutral excitons(<0.3 ns within four-layer),trions possess a longer lifetime(~6.6 ns within four-layer)which increases with the number of *** attribute the longer-lived lifetime to the increasing number of trions as well as the varieties of trion configurations in thicker ***,the whole average lifetime increases over 10%when WSe2 flakes added up from monolayer to *** paper provides a novel tuneable layer-dependent method to control the exciton dynamics process and finds a relatively longer transition lifetime of trions at room temperature,enabling to investigate in the charge transport in TMD-based optoelectronics devices in the future.

关键词： two-dimensional(2D)WSe2 exciton dynamics fluorescence lifetime fluorescence lifetime imaging microscopy(FLIM) density functional theory(DFT)

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The mechanisms and applications of friction energy dissipation

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Friction 2023年第6期11卷 839-864页

作者： Huan liu Boming YANG Chong WANG Yishu HAN dameng liu State Key Laboratory of Tribology Tsinghua UniversityBeijing100084China College of Liberal Arts&Sciences University of Illinois at Urbana-ChampaignUrbana61801USA

About 30%of the world's primary energy consumption is in *** economic losses caused by friction energy dissipation and wear account for about 2%-7%of its gross domestic product(GDP)for different countries every *** key to reducing energy consumption is to control the way of energy dissipation in the friction ***,due to many various factors affecting friction and the lack of efficient detection methods,the energy dissipation mechanism in friction is still a challenging ***,we firstly introduce the classical microscopic mechanism of friction energy dissipation,including phonon dissipation,electron dissipation,and non-contact friction energy ***,we attempt to summarize the ultrafast friction energy dissipation and introduce the high-resolution friction energy dissipation detection system,since the origin of friction energy dissipation is essentially related to the ultrafast dynamics of excited electrons and ***,the application of friction energy dissipation in representative high-end equipment is discussed,and the potential economic saving is predicted.

关键词： friction energy dissipation ultrafast dynamics origin of friction superlubricity

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Factors influencing methane diffusion behaviors in micro-nano coal pores: a comprehensive study

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Frontiers of Earth Science 2023年第1期17卷 71-86页

作者： Xianglong FANG dameng liu Yingfang ZHOU Xiaobo liu Yidong CAI School of Energy Resources China University of GeosciencesBeijing 100083China Coal Reservoir Laboratory of National Engineering Research Center of CBM Development&Utilization China University of GeosciencesBeijing 100083China School of Engineering Fraser Noble BuildingKing's CollegeUniversity of AberdeenAB243UE AberdeenUK Postdoctoral Workstation of Applied Technology Research Institute Northeast Petroleum UniversityDaqing 163318China

Gas diffusion in the coal matrix plays a significant role in forecasting the production performance of coalbed methane(CBM)*** better understand methane diffusion behavior,a systematic study was performed on various rank coals with vitrinite reflectance(Ro,m)ranging from 0.46%to 2.79%.Multiple experiments,including coal petrographic analysis,field emission scanning electron microscopy(FESEM),low-temperature N2 adsorption/desorption,and mercury intrusion porosimetry(MIP),were conducted to quantitatively characterize the multiscale micro-nano pore system in different rank coals,which showed that the pore structure of coals exhibited a multimodal pore size and volume *** adsorption-diffusion experiments using the volumetric method were also performed to understand the methane diffusion characteristics in the micro-nano pores of the coal *** applicability of the multiporous diffusion model is verified,and methane diffusion in the multi-scale pores of coal reservoirs exhibits the characteristics of early fast diffusion,transitional diffusion in the medium term,and slow diffusion in the later *** addition,the factors affecting methane diffusion in coals were systematically analyzed,and gray relational analysis(GRA)was employed to analyze and identify the importance of these factors on methane *** results show the impact ranking of factors,in order from the most important to the least:particle size>moisture>surface area>pore volume>pressure>coal rank>temperature in all of three diffusion *** findings are helpful for forecasting production performance and enhancing the production efficiency of CBM.

关键词： coalbed methane reservoir micro-characteristic diffusion coefficient grey relational analysis

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Petrophysics characteristics of coalbed methane reservoir: a comprehensive review

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Frontiers of Earth Science 2021年第2期15卷 202-223页

作者： Qifeng JIA dameng liu Yidong CAI Xianglong FANG Lijing LI School of Energy Resources China University of GeosciencesBeijing 100083China Coal Reservoir Laboratory of National Engineering Research Center of CBM Development&Utilization China University of GeosciencesBeijing 100083China

Petrophysics of coals directly affects the development of coalbed methane(CBM).Based on the analysis of the representative academic works at home and abroad,the recent progress on petrophysics characteristics was reviewed from the aspects of the scale-span porefracture structure,permeability,reservoir heterogeneity,and its controlling *** results showed that the characterization of pore-fracture has gone through three stages:qualitative and semiquantitative evaluation of porefracture by various techniques,quantitatively refined characterization of pore-fracture by integrating multiple methods including nuclear magnetic resonance analysis,liquid nitrogen,and mercury intrusion,and advanced quantitative characterization methods of pore-fracture by high-precision experimental instruments(focused-ion beam-scanning electron microscopy,small-angle neutron scattering and computed tomography scanner)and testing methods(m-CT scanning and X-ray diffraction).The effects of acoustic field can promote the diffusion of CBM and generally increase the permeability of coal reservoirs by more than 10%.For the controlling factors of reservoir petrophysics,tectonic stress is the most crucial factor in determining permeability,while the heterogeneity of CBM reservoirs increases with the enhancement of the tectonic deformation and stress *** study on lithology heterogeneity of deep and high-dip coal measures,the spatial storage-seepage characteristics with deep CBM reservoirs,and the optimizing production between coal measures should be the leading research directions.

关键词： petrophysics pore-fracture permeability heterogeneity controlling factors

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Laser wavelength effects on(Ti,Al,Si)N in near-field laser nanostructuring by micron optical fiber enhanced irradiation

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Science China(Technological Sciences) 2013年第12期56卷 3012-3016页

作者： liu dameng liu JiaChen WANG Hui SU Kang SHAO TianMin State Key Laboratory of Tribology Tsinghua University

The effects of laser wavelengths(1064,532,355 and 266 nm)on nano-processing of fabricating a groove structure on(Ti,Al,Si)N alloy film using the micro-fiber near-field enhanced irradiation are *** is observed that variations of laser wavelength can effectively change the widths of the groove structures,which are featured as one-dimension bowl-like *** minimum of the groove width can be achieved at 293 nm with a 532 nm laser *** order to fabricate the groove in nanoscale,enough energy is delivered onto(Ti,Al,Si)N surface by a single laser *** results are also discussed to understand the experimental results.

关键词： micro-fiber field enhancement nano-optics nanostructuring

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The component fractionation effect in binary-component gas adsorption isotherm experiments on coal

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Chinese Science Bulletin 2005年第S1期50卷 72-78页

作者： TANG Shuheng HAO Duohu TANG Dazhen liu dameng China University of Geosciences Beijing 100083China China University of Mining and Technology Beijing 100083China

Different gas adsorption isotherm experiments were carried out on the coal samples from Jincheng district, including N2, CH4, CO2, as well as the binary-component gas of CH4-N2 and CH4-CO2 of three different concentrations. In the binary-component gas adsorption isotherm experiments, the gas component with higher adsorption ability is adsorbed firstly. Thus the result in its relative concentration in the free phase shows a trend of decrease first and then increase, whereas the relative concentration of the gas component with lower adsorption ability shows a trend of increase first and then decrease. In the adsorption phrase, the relative concentration of the gas component with higher adsorption ability increases gradually, and the relative concentration of the gas component with lower adsorption ability decreases gradually. In the adsorption competition of the binary-component gas, the adsorption rate of the gas component with higher adsorption ability shows a trend of rapidity at first then slowness, but the adsorption rate of the gas component with lower adsorption ability shows a trend of slowness at first then rapidity. The component fractionation effect in the binary-component gas adsorption isotherm experiments is caused by the difference of the adsorption ability of coal of different gas components.

关键词： coal reservoir binary-component gas adsorption isotherm experiment adsorption ability fractionation effect.

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Frontiers in Coal-related Resources——introduction to the special issue

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Frontiers of Earth Science 2023年第1期17卷 1-3页

作者： dameng liu Shen JIAN Hongfei CHENG Yidong CAI Guangyao SI School of Energy Resource China University of GeosciencesBeijing 100083China Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process(Ministry of Education) China University of Mining and TechnologyXuzhou 221008China School of Earth Science and Resources Chang’an UniversityXi’an 710054China School of Minerals and Energy Resources Engineering University of New South WalesSydneyNSW 2052Australia

Coal-related resources, as a popular development in recent years, is the focus of research in the field of coalbed methane (CBM), coal measure gases, coal-associated rare earth resources and nonmetallic minerals (Moore, 2012;Dai and Finkelman, 2018;Qin et al., 2018). Due to its complexity in concentration, occurrence and exploitation, many key issues need to be addressed (Sayed et al., 2017;Bera et al., 2022;liu et al., 2022).

关键词： minerals coalbed gases

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