Two reduction-cleavable ABA triblock copolymers possessing two disulfide linkages,PMMA-ssPMEO3MA-ss-PMMA and PDEA-ss-PEO-ss-PDEA were synthesized via facile substitution reactions from homopolymer precursors,where PMM...Two reduction-cleavable ABA triblock copolymers possessing two disulfide linkages,PMMA-ssPMEO3MA-ss-PMMA and PDEA-ss-PEO-ss-PDEA were synthesized via facile substitution reactions from homopolymer precursors,where PMMA,PMEO3MA,PDEA,and PEO represent poly（methyl methacrylate）,poly（tri（ethylene glycol） monomethyl ether methacrylate,poly（2-（diethylamino）ethyl methacrylate）,and poly（ethylene oxide）,respectively.Spherical micelles were obtained through supramolecular self-assembly of these two triblock copolymers in aqueous solutions.The resultant micelles with abundant disulfide bonds could serve as soft templates and precisely accommodate gold nanoparticles in the core/shell interface as a result of the formation of Au-S bonds.展开更多
To break through the bottle-neck of quantum yield in upconversion （UC） core-shell system, we elucidated that the energy transfer efficiency in core-shell system had an evident contribution from the charge transfer o...To break through the bottle-neck of quantum yield in upconversion （UC） core-shell system, we elucidated that the energy transfer efficiency in core-shell system had an evident contribution from the charge transfer of interface with related to two factors： （i） band offsets and （2） binding energy area density. These two variables were determined by material intrinsic properties and core-shell thickness ratio. We further unraveled the mechanism of non-radiative energy transfer by charge transfer induced dipole at the inter- face, based on a quasi-classical derivation from F6rster type resonant energy transfer （FRET） model. With stable bonding across the interface, the contributions on energy transfer in both radiative and non-radiative energy transfer should also be accounted together in Auzel＇s energy transfer （ETU） model in core-shell system. Based on the discussion about interface bonding, band offsets, and forma- tion energies, we figured out the significance of interface bonding induced gap states （IBIGS） that played a significant role for influ- encing the charge transfer and radiative type energy transfer. The interface band offsets were a key factor in dominating the non-radiative energy transfer, which was also correlated to core-shell thickness ratio. We found that the energy area density with re- lated to core/shell thickness ratio followed the trend of Boltzman sigmoidal growth function. By the physical trend, this work contrib- uted a reference how the multi-layered core-shell structure was formed starting from the very beginning within minimum size. A route was paved towards a systematic study of the interface to unveil the energy transfer mechanism in core-shell systems.展开更多
Interracial dislocation may have a spreading core corresponding to a weak shear resistance of interfaces. In this paper, a conic model is proposed to mimic the spreading core of interfacial dislocation in anisotropic ...Interracial dislocation may have a spreading core corresponding to a weak shear resistance of interfaces. In this paper, a conic model is proposed to mimic the spreading core of interfacial dislocation in anisotropic bimaterials. By the Stroh formalism and Green＇s function, the analytical expressions of the elastic fields are deduced for such a dislocation. Taking Cu/Nb bimaterial as an example, it is demonstrated that the accuracy and efficiency of the method are well validated by the interface conditions, a spreading core can greatly reduce the stress intensity near the interfacial dislocation compared with the compact core, and the elastic fields near the spreading core region are significantly different from the condensed core, while they are less sensitive to a field point that is 1.5 times the core width away from the center of the spreading core.展开更多
A core shell structured C@MoxTi1-xO2-δnanocrystal with a functionalized interface(C@MTNC-FI)was fabricated via the hydrothermal method with subsequent annealing derived from tetrabutyl orthotitanate.The formation of ...A core shell structured C@MoxTi1-xO2-δnanocrystal with a functionalized interface(C@MTNC-FI)was fabricated via the hydrothermal method with subsequent annealing derived from tetrabutyl orthotitanate.The formation of anatase TiO2 was inhibited by the simultaneous presence of the hydrothermal etching/regrowth process,infiltration of Mo dopants and carbon coating,which endows the C@MTNC-FI with an ultrafine crystalline architecture that has a Mo-functionalized interface and carbon-coated shell.Pt Ru nanoparticles(NPs)were supported on C@MTNC-FI by employing a microwave-assisted polyol process(MAPP).The obtained Pt Ru/C@MTNC-FI catalyst has 2.68 times higher mass activity towards methanol electrooxidation than that of the un-functionalized catalyst(Pt Ru/C@TNC)and 1.65 times higher mass activity than that of Pt Ru/C catalyst with over 25%increase in durability.The improved catalytic performance is due to several aspects including ultrafine crystals of TiO2 with abundant grain boundaries,Mofunctionalized interface with enhanced electron interactions,and core shell architecture with excellent electrical transport properties.This work suggests the potential application of an interface-functionalized crystalline material as a sustainable and clean energy solution.展开更多
Low-efficiency charge transfer is a critical factor to limit the photocatalytic H_(2)evolution activity of semiconductor photocatalysts.The interface design is a promising approach to achieve high chargetransfer effic...Low-efficiency charge transfer is a critical factor to limit the photocatalytic H_(2)evolution activity of semiconductor photocatalysts.The interface design is a promising approach to achieve high chargetransfer efficiency for photocatalysts.Herein,a new 2 D/2 D atomic double-layer WS_(2)/Nb_(2)O_(5)shell/core photocatalyst(DLWS/Nb_(2)O_(5))is designed.The atom-resolved HAADF-STEM results unravel the presence of an unusual 2 D/2 D shell/core interface in DLWS/Nb_(2)O_(5).Taking advantage of the advanced femtosecond-resolved ultrafast TAS spectra,the average lifetime of charge carriers for DLWS/Nb_(2)O_(5)(180.97 ps)is considerably shortened as compared to that of Nb_(2)O_(5)(230.50 ps),strongly indicating that the 2 D/2 D shell/core interface enables DLWS/Nb_(2)O_(5)to achieve ultrafast charge transfer from Nb_(2)O_(5)to atomic double-layer WS_(2),thus yielding a high photocatalytic H_(2)evolution rate of 237.6 mmol/h,up to10.8 times higher than that of pure Nb_(2)O_(5)nanosheet.This study will open a new window for the development of high-efficient photocatalytic systems through the interface design.展开更多
We present a systematic first-principles based study on the formation of coherent L12-phase nanoparticles in dilute Al-Sc-Zr alloys.Bulk structures and properties,solute substitution,interface formation energies,and i...We present a systematic first-principles based study on the formation of coherent L12-phase nanoparticles in dilute Al-Sc-Zr alloys.Bulk structures and properties,solute substitution,interface formation energies,and interfacial coherent strains are all calculated.Nucleation modeling and relevant energetic calculations are performed on various possible structures of L12-phase nano-precipitates,i.e.individual L12-Al3Sc and L12-Al3Zr,homogeneous L12-Al3(ScxZr1-x)and the core-shelled L12-Al3Sc(Al3Zr)and L12-Al3Zr(Al3Sc).The following insights are obtained.Matrix-dissolved Sc or Zr strongly prefers to substitute the X sublattice sites in L12-Al3X(X=Zr or Sc),while the inter-substitution between L12-Al3Sc and Al3Zr is only weakly feasible.The cube-on-cube orientation with the(100)/(100)contacting facets is the most energy favored for the Al/Al3Sc(L12),Al/Al3Zr(L12)and Al3Sc(L12)/Al3Zr(L12)interfaces.All these interfaces are highly coherent,with fairly low formation energy.And particularly,the Al3Sc(L12)/Al3Zr(L12)interface has essentially zero formation energy.Ternary L12-Al3(ScxZr1-x)precipitates tend to form a Al3Sc-based core and Al3Zr-based shell structure,with a relatively sharp inner interface of Al3Sc(L12)/Al3Zr(L12).This core-shelled structure becomes energetically more favorable for the particle size R>1–2 nm.The potential influence of the Sc/Zr ratio and temperature on the relative stabilities of L12-phases in Al is also evaluated and discussed.展开更多
With the rapid development of integrated circuit(IC)technology,reusable intelligent property(IP)core design is widely valued by the industry.Based on the in-depth study of the functional characteristics of advanced mi...With the rapid development of integrated circuit(IC)technology,reusable intelligent property(IP)core design is widely valued by the industry.Based on the in-depth study of the functional characteristics of advanced microcontroller bus architecture(AMBA),a design scheme of IP core is presented,and it is divided into the functional modules,and the structural design of the IP core is completed.The relationship between the internal modules of the IP core is clarified,and the top-down design method is used to build the internal architecture of the IP core.The IP core interface module,register module,baud rate module,transmit module,receive module,and interrupt module are designed in detail by using Verilog language.The simulation results show that the designed IP core supports serial peripheral interface(SPI)protocol,the function coverage of IP core reaches 100%,the maximum working frequency reaches 200 MHz,and the resource occupancy rate is less than 15%.The reusable IP core can support multiple data formats,multiple timing transmission modes,and master/slave operation modes,reducing the resource consumption of hardware circuits and having stronger applicability.展开更多
A simple Core-SOL-Divertor （C-S-D） model has been developed to investigate qualitatively the overall features of the operational space for the integrated core and edge plasma. To construct the simple C-S-D model, a ...A simple Core-SOL-Divertor （C-S-D） model has been developed to investigate qualitatively the overall features of the operational space for the integrated core and edge plasma. To construct the simple C-S-D model, a simple core plasma model of ITER physics guidelines and a two-point SOL-divertor model are used. The simple C-S-D model is applied to the study of the EAST operational space with lower hybrid current drive experiments under various kinds of trade-off for the basic plasma parameters. Effective methods for extending the operational space are also presented, From this study for the EAST operational space, it is evident that the C-S-D model is a useful tool for understanding qualitatively the overall features of the plasma operational space.展开更多
ASP.Net Core MVC技术近几年被广泛应用于智能制造MES、控制、监控领域。本设计工作日志上传系统是利用ASP.Net Core MVC的优势,实现的功能是:在Oracle Linux 7.6服务器上发布应用程序,在任意接入服务器网内的PC上通过浏览器注册登录后...ASP.Net Core MVC技术近几年被广泛应用于智能制造MES、控制、监控领域。本设计工作日志上传系统是利用ASP.Net Core MVC的优势,实现的功能是:在Oracle Linux 7.6服务器上发布应用程序,在任意接入服务器网内的PC上通过浏览器注册登录后添加当日工作日志的功能。本设计使用ASP.Net Core MVC技术,基于内置依赖注入与接口的程序设计,结构清晰,应用发布跨平台,用户可将应用发布到Linux或Windows平台。展开更多
基金financial support from the National Natural Scientific Foundation of China(NNSFC) Project(Nos.51690150,51690154,and 21674103)Anhui Provincial Natural Scientific Foundation project(No.1508085QB43)
文摘Two reduction-cleavable ABA triblock copolymers possessing two disulfide linkages,PMMA-ssPMEO3MA-ss-PMMA and PDEA-ss-PEO-ss-PDEA were synthesized via facile substitution reactions from homopolymer precursors,where PMMA,PMEO3MA,PDEA,and PEO represent poly（methyl methacrylate）,poly（tri（ethylene glycol） monomethyl ether methacrylate,poly（2-（diethylamino）ethyl methacrylate）,and poly（ethylene oxide）,respectively.Spherical micelles were obtained through supramolecular self-assembly of these two triblock copolymers in aqueous solutions.The resultant micelles with abundant disulfide bonds could serve as soft templates and precisely accommodate gold nanoparticles in the core/shell interface as a result of the formation of Au-S bonds.
基金Project supported by the National Natural Science Foundation of China(NSFC)(21425101,21321001,21371011,21331001)Ministry of Science and Technology(MOST)of China(2014CB643800)+3 种基金Natural Science Foundation of China(NSFC) for the Youth Scientist grant(11504309)the Initial Start-up Grant Support from the Department General Research Fund(Dept.GRF) from ABCT in the Hong Kong Polytechnic Universitythe Early Career Scheme(ECS) Fund(PolyU 253026/16P) from the Research Grant Council(RGC)in Hong Kongthe High Performance Supercomputer(ATOM Project)in PolyU
文摘To break through the bottle-neck of quantum yield in upconversion （UC） core-shell system, we elucidated that the energy transfer efficiency in core-shell system had an evident contribution from the charge transfer of interface with related to two factors： （i） band offsets and （2） binding energy area density. These two variables were determined by material intrinsic properties and core-shell thickness ratio. We further unraveled the mechanism of non-radiative energy transfer by charge transfer induced dipole at the inter- face, based on a quasi-classical derivation from F6rster type resonant energy transfer （FRET） model. With stable bonding across the interface, the contributions on energy transfer in both radiative and non-radiative energy transfer should also be accounted together in Auzel＇s energy transfer （ETU） model in core-shell system. Based on the discussion about interface bonding, band offsets, and forma- tion energies, we figured out the significance of interface bonding induced gap states （IBIGS） that played a significant role for influ- encing the charge transfer and radiative type energy transfer. The interface band offsets were a key factor in dominating the non-radiative energy transfer, which was also correlated to core-shell thickness ratio. We found that the energy area density with re- lated to core/shell thickness ratio followed the trend of Boltzman sigmoidal growth function. By the physical trend, this work contrib- uted a reference how the multi-layered core-shell structure was formed starting from the very beginning within minimum size. A route was paved towards a systematic study of the interface to unveil the energy transfer mechanism in core-shell systems.
基金Project supported by the National Natural Science Foundation of China(No.11672173)the Shanghai Eastern-Scholar Planthe Innovation Program of Shanghai Municipal Education Commission
文摘Interracial dislocation may have a spreading core corresponding to a weak shear resistance of interfaces. In this paper, a conic model is proposed to mimic the spreading core of interfacial dislocation in anisotropic bimaterials. By the Stroh formalism and Green＇s function, the analytical expressions of the elastic fields are deduced for such a dislocation. Taking Cu/Nb bimaterial as an example, it is demonstrated that the accuracy and efficiency of the method are well validated by the interface conditions, a spreading core can greatly reduce the stress intensity near the interfacial dislocation compared with the compact core, and the elastic fields near the spreading core region are significantly different from the condensed core, while they are less sensitive to a field point that is 1.5 times the core width away from the center of the spreading core.
基金the National Natural Science Foundation of China (Grant Nos. 21273058, 21673064, 51802059 and 21503059)China Postdoctoral Science Foundation (Grant Nos. 2018M631938, 2018T110307 and 2017M621284)+1 种基金Heilongjiang Postdoctoral Fund (LBH-Z17074)Fundamental Research Funds for the Central Universities (Grant No. HIT. NSRIF. 2019040 and 2019041)
文摘A core shell structured C@MoxTi1-xO2-δnanocrystal with a functionalized interface(C@MTNC-FI)was fabricated via the hydrothermal method with subsequent annealing derived from tetrabutyl orthotitanate.The formation of anatase TiO2 was inhibited by the simultaneous presence of the hydrothermal etching/regrowth process,infiltration of Mo dopants and carbon coating,which endows the C@MTNC-FI with an ultrafine crystalline architecture that has a Mo-functionalized interface and carbon-coated shell.Pt Ru nanoparticles(NPs)were supported on C@MTNC-FI by employing a microwave-assisted polyol process(MAPP).The obtained Pt Ru/C@MTNC-FI catalyst has 2.68 times higher mass activity towards methanol electrooxidation than that of the un-functionalized catalyst(Pt Ru/C@TNC)and 1.65 times higher mass activity than that of Pt Ru/C catalyst with over 25%increase in durability.The improved catalytic performance is due to several aspects including ultrafine crystals of TiO2 with abundant grain boundaries,Mofunctionalized interface with enhanced electron interactions,and core shell architecture with excellent electrical transport properties.This work suggests the potential application of an interface-functionalized crystalline material as a sustainable and clean energy solution.
基金funded by the China Postdoctoral Science Foundation(pre-station,No.2019TQ0050)Applied Basic Research Program of Sichuan Province(No.2020YJ0068)+5 种基金the China Postdoctoral Science Foundation(No.2020M673186)National Natural Science Foundation of China(No.22002014)National Natural Science Foundation of China(No.11804248)the financial support from the National Natural Science Foundation of China(No.21971113)Natural Science Foundation of Tianjin(No.18JCQNJC03200)supported by MOE Tier 1 RG4/17 and MOE Tier 2 MOE2019-T2-2-105。
文摘Low-efficiency charge transfer is a critical factor to limit the photocatalytic H_(2)evolution activity of semiconductor photocatalysts.The interface design is a promising approach to achieve high chargetransfer efficiency for photocatalysts.Herein,a new 2 D/2 D atomic double-layer WS_(2)/Nb_(2)O_(5)shell/core photocatalyst(DLWS/Nb_(2)O_(5))is designed.The atom-resolved HAADF-STEM results unravel the presence of an unusual 2 D/2 D shell/core interface in DLWS/Nb_(2)O_(5).Taking advantage of the advanced femtosecond-resolved ultrafast TAS spectra,the average lifetime of charge carriers for DLWS/Nb_(2)O_(5)(180.97 ps)is considerably shortened as compared to that of Nb_(2)O_(5)(230.50 ps),strongly indicating that the 2 D/2 D shell/core interface enables DLWS/Nb_(2)O_(5)to achieve ultrafast charge transfer from Nb_(2)O_(5)to atomic double-layer WS_(2),thus yielding a high photocatalytic H_(2)evolution rate of 237.6 mmol/h,up to10.8 times higher than that of pure Nb_(2)O_(5)nanosheet.This study will open a new window for the development of high-efficient photocatalytic systems through the interface design.
基金financial support from the National Natural Science Foundation of China (No. 51471189)the Key Research and Development Projects of Shandong Province (No. 2017GGX20130)the National Basic Research Program of China (sub-contract No. 2014CB644001-2)
文摘We present a systematic first-principles based study on the formation of coherent L12-phase nanoparticles in dilute Al-Sc-Zr alloys.Bulk structures and properties,solute substitution,interface formation energies,and interfacial coherent strains are all calculated.Nucleation modeling and relevant energetic calculations are performed on various possible structures of L12-phase nano-precipitates,i.e.individual L12-Al3Sc and L12-Al3Zr,homogeneous L12-Al3(ScxZr1-x)and the core-shelled L12-Al3Sc(Al3Zr)and L12-Al3Zr(Al3Sc).The following insights are obtained.Matrix-dissolved Sc or Zr strongly prefers to substitute the X sublattice sites in L12-Al3X(X=Zr or Sc),while the inter-substitution between L12-Al3Sc and Al3Zr is only weakly feasible.The cube-on-cube orientation with the(100)/(100)contacting facets is the most energy favored for the Al/Al3Sc(L12),Al/Al3Zr(L12)and Al3Sc(L12)/Al3Zr(L12)interfaces.All these interfaces are highly coherent,with fairly low formation energy.And particularly,the Al3Sc(L12)/Al3Zr(L12)interface has essentially zero formation energy.Ternary L12-Al3(ScxZr1-x)precipitates tend to form a Al3Sc-based core and Al3Zr-based shell structure,with a relatively sharp inner interface of Al3Sc(L12)/Al3Zr(L12).This core-shelled structure becomes energetically more favorable for the particle size R>1–2 nm.The potential influence of the Sc/Zr ratio and temperature on the relative stabilities of L12-phases in Al is also evaluated and discussed.
文摘With the rapid development of integrated circuit(IC)technology,reusable intelligent property(IP)core design is widely valued by the industry.Based on the in-depth study of the functional characteristics of advanced microcontroller bus architecture(AMBA),a design scheme of IP core is presented,and it is divided into the functional modules,and the structural design of the IP core is completed.The relationship between the internal modules of the IP core is clarified,and the top-down design method is used to build the internal architecture of the IP core.The IP core interface module,register module,baud rate module,transmit module,receive module,and interrupt module are designed in detail by using Verilog language.The simulation results show that the designed IP core supports serial peripheral interface(SPI)protocol,the function coverage of IP core reaches 100%,the maximum working frequency reaches 200 MHz,and the resource occupancy rate is less than 15%.The reusable IP core can support multiple data formats,multiple timing transmission modes,and master/slave operation modes,reducing the resource consumption of hardware circuits and having stronger applicability.
基金supported in part by the JSPS-CAS Core-University Program in the field of Plasma and Nuclear Fusionalso carried out as a joint project under the Facility Utilization Program of JAERI.
文摘A simple Core-SOL-Divertor （C-S-D） model has been developed to investigate qualitatively the overall features of the operational space for the integrated core and edge plasma. To construct the simple C-S-D model, a simple core plasma model of ITER physics guidelines and a two-point SOL-divertor model are used. The simple C-S-D model is applied to the study of the EAST operational space with lower hybrid current drive experiments under various kinds of trade-off for the basic plasma parameters. Effective methods for extending the operational space are also presented, From this study for the EAST operational space, it is evident that the C-S-D model is a useful tool for understanding qualitatively the overall features of the plasma operational space.
