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Intercalation and hybrid heterostructure integration of two-dimensional atomic crystals with functional organic semiconductor molecules

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Nano Research 2020年第11期13卷 2917-2924页

作者： Wen He Han Zang Songhua cai Zhangyan Mu Cheng Liu Mengning ding Peng Wang Xinran Wang Key Laboratory of Mesoscopic Chemistry School of Chemistry and Chemical EngineeringNanjing UniversityNanjing210093China National Laboratory of Solid State Microstructures Nanjing UniversityNanjing210093China School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing210093China Jiangsu Key Laboratory of Artificial Functional Materials College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing210093China Department of Applied Physics The Hong Kong Polytechnic UniversityHung Hom999077KowloonHong KongChina Research Center for Environmental Nanotechnology(ReCENT) Nanjing UniversityNanjing210023China

Van der Waals(vdW)integration affords semiconductor heterostructures without constrains of lattice matching and opens up a new realm of functional devices by design.A particularly interesting approach is the electrochemical intercalation of two-dimensional(2D)atomic crystal and formation of superlattices,which can provide scalable production of novel vdW ***,this approach has been limited to the use of organic cations with non-functional aliphatic chains,therefore failed to take the advantage of the vast potentials in molecular functionalities(electronic,photonic,magnetic,etc.).Here we report the integration of 2D crystal(MoS_(2),WS_(2),highly oriented pyrolytic graphite(HOPG),WSe_(2) as model systems)with electrochemically inert organic molecules that possess semiconducting characteristics(including perylene-3,4,9,10-tetracarboxylic dianhydride(PTCDA),pentacene and fullerene),through on-chip electrochemical *** unprecedented long-range spatial feature of intercalation has been achieved,which allowed facile assembly of a vertical MoS_(2)-PTCDA-Si *** intercalated heterostructure shows significant modulation of the lateral transport,and leads to a molecular tunneling characteristic at the vertical *** general intercalation of charge neutral and functional molecules defines a versatile platform of inorganic/organic hybrid vdW heterostructures with significantly extended molecular functional building blocks,holding great promise in future design of nano/quantum devices.

关键词： transition metal dichalcogenide electrochemical intercalation perylene-3,4,9,10-tetracarboxylic dianhydride(PTCDA) organic semiconductor inorganic/organic heterostructure

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A Novel Bionic Piezoelectric Actuator Based on the Walrus Motion

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Journal of Bionic Engineering 2021年第5期18卷 1117-1125页

作者： Jianping Li Junjie cai Nen Wan Yili Hu Jianming Wen Junwu Kan Song Chen Hongwei Zhao Key Laboratory of Urban Rail Transit Intelligent Operation and Maintenance Technology and Equipment of Zhejiang Provincial The Institute of Precision Machinery and Smart StructureCollege of EngineeringZhejiang Normal UniversityJinhua 321004China School of Mechanical and Aerospace Engineering Jilin UniversityChangchun 130025China

A novel bionic piezoelectric actuator based on the walrus motion to achieve high performance on large working stroke for micro/nano positioning systems is first proposed in this *** structure of the proposed walrus type piezoelectric actuator is described,and its motion principle is presented in *** experimental system is set up to verify its feasibility and explore its working *** results indicate that the proposed walrus type piezoelectric actuator could realize large working stroke with only one driving unit and one coupled clamping unit;the maximum stepping displacement isΔL max=19.5μm in the case that the frequency f=1 Hz and the voltage U=120 V;the maximum speed V max=2275.2μm·s^(-1) when the frequency f=900 Hz and the voltage U=120 V;the maximum vertical load m max=350 g while the voltage U=120 V and the frequency f=1 *** study shows the feasibility of mimicking the bionic motion of the real walrus animal to the design of piezoelectric actuators,which is hopeful for the real application of micro/nano positioning systems to achieve large working stroke and high performance.

关键词： Piezoelectric actuator Bionic actuator Walrus motion Flexure mechanism

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Nucleation and epitaxy growth of high-entropy REBa_(2)Cu_(3)O_(7-δ)(RE=Y,Dy,Gd,Sm,Eu)thin films by metal organic deposition

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Journal of Rare Earths 2023年第7期41卷 1091-1098,I0004页

作者： Jing Chen Rongtie Huang Xinghang Zhou difan Zhou Minjuan Li Chuanyi Bai Zhiyong Liu Chuanbing cai Shanghai Key Laboratory of High Temperature Superconductors Physics DepartmentShanghai UniversityShanghai 200444China Shanghai Creative Superconductor Technologies Co. Ltd.Shanghai 201401China

High-entropy REBa_(2)Cu_(3)O_(7-δ)(RE=Y_(0.7)+Dy_(0.2)+Gd_(0.2)+Sm_(0.2)+Eu_(0.2))(HE-REBCO) superconducting films doped with multiple rare earth elements were successfully fabricated with thickness up to 800 nm by a trifluoroacetate-metal organic deposition(TFA-MOD).The enhanced entropy change ΔS of the HEREBCO system promotes the c-axis growth of REBCO thin film in the competition with a/b-axis *** microstructure and element distribution were investigated by the transmission electron microscopy(TEM) and energy dispersive spectroscopy(EDS).The results show that HE-REBCO films have a great amount of stacking defects,lattice distortions and various rare earth ***,the microstrain of HE-REBCO films increases significantly compared to the undoped YBCO and(Y,Dy)BCO ***,the superco nducting critical temperature(T_c^(onset)) of HE-REBCO films is about 93 K,and the in-field properties are significantly improved,especially at the temperature of about 77 *** maximum pinning force density(F_(p,max)) of the HE-REBCO samples at 77 K is 1.7 times higher than that of the undoped YBCO films.

关键词： High-entropy superconductor REBa_(2)Cu_(3)O_(7-δ) Rare earths Trifluoroacetate-metal organic deposition Enhanced entropy change

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Valid hydrodynamic interaction regions of multiple ships advancing in waves

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Journal of Hydrodynamics 2013年第6期25卷 856-866页

作者：许勇董文才 Department of Naval Architecture Naval University of Engineering

Based on the 3-D surface panel method combined with the translating-pulsating source Green function, an approximate approach is developed to solve the hydrodynamic interacting problem of multiple ships advancing parallel in waves. Focus is on improving the calculating efficiency. In this approach, each ship is assumed to be in each other＇s far-field, and the near-field term in this Green function is neglected if the source point falls on one ship and the field point on others. Further, a matching relationship between the far-field waves and the interfered regions, which are defined as the overlapping areas between the mean wetted body surface of one ship and the propagating regions of the waves generated by another ship, is introduced to avoid the unnecessary computation of the relative terms of the Green function, if the field point is not in the overlapping areas. The approach is validated through studying the hydrodynamic terms and the free motions of two or three ships in side-by-side arrangement by comparing the obtained results with the model tests and the predictions of the exact method. The average calculating speed for the present approximate method is about 1.65-1.8 times of that for the exact method for solving the hydrodynamic interaction problem of two ships, and 2.56-2.73 times for that of three ships.

关键词： wave pattern translating-pulsating source calculation efficiency model test multiple ships

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The longest ultraconserved sequences and evolution of vertebrate mitochondrial genomes

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Chinese Science Bulletin 2006年第5期51卷 552-556页

作者： FANG Weiwu TU Sili cai Xu WANG Yuncheng WU Weixing Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100080 China Shandong Agricultural University Taian 271018 China University of International Business and Economics Beijing 100029 China

We compared 753 genomes of bacteria, archaea, and mitochondria (more than 540 M data) and found four unique ultraconserved sequences in 352 vertebrate mitochondrial genomes which are the longest or second longest or third longest ultracon- served subsequences in the vertebrate mitochondrial genomes, their lengths are approximate to those of small RNA. Surprisingly, the classification and evolu- tion relationship among some high-level categories of animals can be clearly reflected by their regularity of occurrence; moreover, these findings gave rise to some new ideas of evolution of mitochondria and living beings. For instance, the variations in mito- chondrial genomes of animals may help clarify the evolution relationship between Aves and Reptile, and understand the fact that the origin of mitochondrion is at least not a simple copy of genomes of lower living things such as bacteria and archaea.

关键词：脊椎动物线粒体RNA 基因组序列结构

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Evaluation of PCDD/Fs and metals emission from a circulating fluidized bed incinerator co-combusting sewage sludge with coal

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Journal of Environmental Sciences 2013年第1期25卷 231-235页

作者： Gang Zhang Jing Hai Jiang Cheng Zhiqi cai Mingzhong Ren Sukun Zhang Jieru Zhang School of Chemistry and Chemical Engineering South China University of Technology South China Institute of Environmental Sciences Ministry of Environmental Protection

The emission characteristics of polychlorinated dibenzo-p-dioxins and dibenzofurans （PCDD/Fs） and heavy metals were evaluated during co-combustion of sewage sludge with coal from a circulating fluidized bed incinerator. The stack gas, slag and fly ash samples were sampled and analyzed. The gas-cleaning system consisted of electrostatic precipitators and a semi-dry scrubber. Results showed that the stack gas and fly ash exhibited mean dioxin levels of 9.4 pg I-TEQ/Nm3 and 11.65 pg I-TEQ/g, respectively, and showed great similarities in congener profiles. By contrast, the slag presented a mean dioxin level of 0.15 pg I-TEQ/g and a remarkable difference in congener profiles compared with those of the stack gas and fly ash. Co-combusting sewage sludge with coal was able to reduce PCDD/Fs emissions significantly in comparison with sewage sludge mono-combustion. The leaching levels of Hg, Pb, Cd, Ni, Cr, Cu, and As in the fly ash and slag were much lower than the limits of the environmental protection standard in China. These suggest that the co-combustion of sewage sludge and coal is an advisable treatment method from an environmental perspective.

关键词： co-combustion PCDD/Fs sewage sludge heavy metals

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Drag-reduction of a nonionic surfactant aqueous solution and its rheological characteristics

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Science China(Technological Sciences) 2012年第4期55卷 772-778页

作者： cai ShuPeng SUZUKI Hiroshi KOMODA Yoshiyuki Institute of High Pressure Water Jet Hunan University of TechnologyZhuzhou 412007China Graduate of Science and technology Kobe UniversityKobe 657-8501Japan

In order to develop turbulent drag-reducing technology by using an environmentally friendly additive in a water-transporting system,the drag reducing characteristics in a non-ionic surfactant(Oleyldimethylamineoxide,ODMAO) dilute aqueous solution flowing in a circular pipe of 5 mm diameter have been experimentally investigated with an air-driven fluid resistance test *** rheological characteristics of the solution have also been examined by a rheometer with a cone-plate flow *** results show that the ODMAO solutions are drag-reducing when concentration is 400 ppm or higher,that the critical Reynolds number corresponding to the maximum drag reduction rate increases with both concentration and temperature,and that the maximum drag reduction rate can reach up to 70% in the straight *** low shear rates,the shear viscosity of ODMAO solutions with a relatively high drag-reduction behaves similarly to Newtonian fluids;at above a certain critical shear rate,it is firstly shear-thickening,then *** shear-rate-dependent characteristics of the shear viscosity are attributed to the different transitions of micellar network structure induced by different shear *** of shear stress after removing an applied constant shear rate at which the solution is in the SIS(shear-induced structure) state is found to be well expressed by a 2-step Maxwell model with a tail relaxation time much shorter than that for a drag-reducing cationic surfactant,which indicates that for the ODMAO solution,a viscoelasticity as strong as a drag-reducing cationic surfactant is not needed to realize turbulent drag-reduction.

关键词： nonionic surfactant drag-reduction shear viscosity shear stress relaxation

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Boosting electrocatalytic hydrogen generation by a renewable porous wood membrane decorated with Fe-doped NiP alloys

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Journal of Energy Chemistry 2021年第5期30卷 23-33页

作者： Bin Hui Jian Li Yun Lu Kewei Zhang Hongjiao Chen Dongjiang Yang Liping cai Zhenhua Huang State Key Laboratory of Bio-Fibers and Eco-Textiles Shandong Collaborative Innovation Center of Marine Biobased Fiber and Ecological TextileInstitute of Marine Biobased MaterialsSchool of Environmental Science and EngineeringQingdao UniversityQingdao 266071ShandongChina Key Laboratory of Bio-based Materials Science and Technology of Ministry of Education Research Center of Wood Bionic Intelligent ScienceNortheast Forestry UniversityHarbin 150040HeilongjiangChina Research Institute of Wood Industry Chinese Academy of ForestryBeijing 100091China College of Engineering University of North Texas3940 NElm St.DentonTX 76207USA

Porous biomass electrodes have emerged as a critical material for electrocatalytic hydrogen evolution reaction(HER).However,most approaches for synthesizing porous electrodes from biomass require high energy consumption,which is resulted from the smash of biomass and the undergoing of serial ***,a self-supported wood-derived"breathable"membrane is utilized directly as electrodes for highefficient HER via an assembly of Fe-doped NiP *** well-designed hierarchical porous structures in natural wood membrane(NWM)are unusually beneficial for electrolytes accessibility and hydrogen gas *** obtained wood-derived membrane exhibits a high electrocatalytic activity and good cycling durability in acidic and alkaline ***,the Fe_(0.074) NiP alloys/NWM electrode affords a large current density of 100 m A cm^(-2) at extremely low overpotentials of 168 mV in acidic electrolyte and174 m V in alkaline *** functional theory calculations unveil that the Fe atom doped in NiP alloys can create much more charge accumulation around Fe and Ni active sites,which helps decrease the △GH_(*)and △G_(H2O)and significantly promote the HER *** new insight will promote further explorations of economic,high-efficient,and biodegradable wood-derived electrocatalysts for HER.

关键词： Wood membrane Hierarchical structures Electrocatalysis:Hydrogen generation

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Velocity Selection of Atomic Beam by Laser

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Chinese Physics Letters 1995年第5期12卷 269-272页

作者： cai Weiquan CHEN Hongxin LI Fusheng SHU Wei SUN Shundi WANG Yuzhu Joint Laboratory for Quantum Optics Shanghai Institute of Optics and Fine Mechanics and East China Normal University Shanghai Institute of Optics and Fine Mechanics Academia SinicaShanghai 201800

It is possible to deflect a group of atoms with a certain velocity from an effusive atomic beam if we use a properly detuned laser beam with a small angle off orthogonal to the atomic *** and initial experimental resu... 详细信息

关键词： beam Velocity properly

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Moderated crevice corrosion susceptibility of Ti6Al4V implant material due to albumin-corrosion interaction

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Journal of Materials Science & Technology 2022年第14期109卷 209-220页

作者： Jing Wu Meng Li Chuanchuan Lin Pengfei Gao Rui Zhang Xuan Li Jixi Zhang Kaiyong cai Key Laboratory of Biorheological Science and Technology Ministry of EducationCollege of BioengineeringChongqing UniversityChongqing 400044China

Localized corrosion of metallic biomaterials is a concerning problem for implant *** the present work,the interaction between localized corrosion of Ti6Al4V implant material and adsorption of bovine serum albumin(BSA)was investigated by electrochemical tests,surface morphological and compositional *** artificial crevice was set up on the Ti6Al4V surface to simulate the crevice corrosion of metallic *** results show that the BSA adsorption is regulated by the heterogeneous metallic ion release resulted from the crevice *** negatively charged BSA prefers to aggregate at the interior of artificial crevice due to electrostatic interaction with the concentrated metallic cations in the *** return,the non-uniform BSA adsorption can decrease the crevice corrosion susceptibility of the Ti6Al4V implant material,even though the presence of BSA accelerates the dissolution of passive *** the Ti6Al4V alloys with artificial crevice,stable localized corrosion occurs after 96 h of immersion in the PBS free of BSA while no stable localized corrosion can be determined in the presence of 4%*** is deduced that the presence of BSA can reduce the surface potential discrepancy between the crevice interior and the crevice *** disclosed mechanism of albumin-corrosion interaction is vital to the localized corrosion control of metallic implants in clinical use.

关键词： Titanium alloy Albumin Electrochemistry Localized corrosion Protein adsorption

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