A new case configuration in R^3, the conjugate-nest consisted of one regular tetrahedron and one regular octahedron is discussed. If the configuration is a central configuration, then all masses of outside layer are e...A new case configuration in R^3, the conjugate-nest consisted of one regular tetrahedron and one regular octahedron is discussed. If the configuration is a central configuration, then all masses of outside layer are equivalent, the masses of inside layer are also equivalent. At the same time the following relation between ρ（r =√3/3ρ is the radius ratio of the sizes） and mass ratio τ=~↑m/m must be satisfied τ=~↑m/m=ρ（ρ＋3）（3＋2ρ＋ρ^2）^-3/2＋ρ（-ρ＋3）（3-2ρ＋ρ^2）^-3/2-4.2^-3/2ρ^-2-^-1ρ^-2/2（1＋ρ）（3＋2ρ＋ρ^2）^-3/2＋2（ρ-1）（3-2ρ＋ρ^2）^-3/2-4（2√2）^-3ρ, and for any mass ratio τ, when mass ratio r is in the open interval （0, 0.03871633950 ... ）, there exist three central configuration solutions（the initial configuration conditions who imply hamagraphic solutions） corresponding radius ratios are r1, r2, and r3, two of them in the interval （2.639300779… , ＋∞） and one is in the interval （0.7379549890…, 1.490942703… ）. when mass ratio τ is in the open interval （130.8164950… , ＋∞）, in the same way there have three corresponding radius ratios, two of them in the interval （0, 0.4211584789... ） and one is in the interval （0.7379549890…, 1.490942703…）. When mass ratio τ is in the open interval （0.03871633950…, 130.8164950…）, there has only one solution r in the interval （0.7379549890…, 1.490942703… ）.展开更多
Nanozymes,which possess enzyme-like catalytic activity,are attractive alternatives to natural enzymes.Their activity is largely dependent on the structure of the material.However,challenges remain in optimizing the st...Nanozymes,which possess enzyme-like catalytic activity,are attractive alternatives to natural enzymes.Their activity is largely dependent on the structure of the material.However,challenges remain in optimizing the structure-activity relationship.This work explores the synthesis and utilization of PtCu nanostructures(NSs),focusing on their peroxidase(POD)-like properties and their potential as antibacterial agents.We developed PtCu dendrites that transform into unique dendroframe octahedrons(DFOs)and subsequently stabilize into solid octahedrons with unusual growth behaviour.The intermediate DFO,showed higher POD-like activity in comparison to other shapes of PtCu NSs.The DFOs also have the better ability to consume glutathione,thus enhancing their sterilization effect.Furthermore,we demonstrate the effectiveness of these PtCu DFOs as powerful antibacterial agents.This work provides valuable information on shape dependent activities of PtCu NSs in the field of biomedicine.展开更多
Three-dimensional （3D） porous V2O5 octahedrons have been successfully fabricated via a solid-state conversion process of freshly prepared ammonium vanadium oxide （AVO） octahedrons. The formation of AVO octahedrons...Three-dimensional （3D） porous V2O5 octahedrons have been successfully fabricated via a solid-state conversion process of freshly prepared ammonium vanadium oxide （AVO） octahedrons. The formation of AVO octahedrons is a result of the selective adsorption of capping reagents and the favourable supersaturation of growth species. Subsequently, 3D porous V2O5 octahedrons were obtained by simple thermolysis of the AVO octahedrons via a calcination treatment. As cathode material for lithium batteries, the porous V2O5 octahedron cathode exhibits a capacity of 96 mAh·g^-1 at high rate up to 2 A·g^-1 in the rang of 2.4 4 V and excellent cyclability with little capacity loss after 500 cycles, which can be ascribed to its high specific surface area and tunable pore architecture. Importantly, this facile solid-state thermal conversion strategy can be easily extended to controllably fabricate other porous metal oxide micro/nano materials with specific surface textures and morphologies.展开更多
Multiferroic BiFeO_(3)-based ceramics were synthesized using the rapid liquid-phase sintering method.The rare-earth ion(Sm^(3+),Gd^(3+),Y^(3+))doping causes structural distortion without changing the intrinsic rhomboh...Multiferroic BiFeO_(3)-based ceramics were synthesized using the rapid liquid-phase sintering method.The rare-earth ion(Sm^(3+),Gd^(3+),Y^(3+))doping causes structural distortion without changing the intrinsic rhombohedral perovskite structure.Raman analysis shows that the effect of doping on E modes is greater than A1 modes,and the microstructure of FeO_(6) octahedron can be regulated by ion doping.A-site trivalent ion doped ceramics exhibit improved magnetism compared with pure BiFeO_(3) ceramic,which originated from the suppressed spiral spin structure of Fe ions.The tilt of FeO_(6) octahedron as a typical structure instability causes the anomalous change of the imaginary part of permittivity at high frequency,and doped ceramics exhibit natural resonance around 16-17 GHz.展开更多
Phase-change memory(PCM)has been developed for three-dimensional(3D)data storage devices,posing huge challenges to the thermal stability and reliability of PCM.However,the low thermal stability of Ge2Sb2Te5(GST)limits...Phase-change memory(PCM)has been developed for three-dimensional(3D)data storage devices,posing huge challenges to the thermal stability and reliability of PCM.However,the low thermal stability of Ge2Sb2Te5(GST)limits further application.Here,we demonstrate PCM based on In0.9Ge2Sb2Te5(IGST)alloy,showing 180C 10-years data retention,6 ns set speed,one order of magnitude longer life time,and 75%reduced power consumption compared to GST-based device.The In can occupy the cationic positions and the In-Te octahedrons with good phase-change properties can geometrically match well with the host Ge-Te and Sb-Te octahedrons,acting as nucleation centers to boost the set speed and enhance the endurance of IGST device.Introducing stable matched phase-change octahedrons can be a feasible way to achieve practical PCMs.展开更多
Since the historical discovery of high Tc superconductivity(HTS)of La2CuO4 in 1986[1],the superconductivity me chanism of copper oxides remains one of the biggest mysteries in the field of condensed matter physics[2-1...Since the historical discovery of high Tc superconductivity(HTS)of La2CuO4 in 1986[1],the superconductivity me chanism of copper oxides remains one of the biggest mysteries in the field of condensed matter physics[2-10].High-Tc cuprates crystallize into layered perovskite structure,as well as copper oxygen octahedron coordination.In octahedron symmetry,the 3d orbitals of Cu^2+with a 3d^9 configuration degenerate into two top eg and three lower t2g orbitals.展开更多
It is a challenge to obtain highly tunable multifunctional performances in one ferroelectric system by a simple approach to meet the miniaturization,integration,and functionalization requirements of advanced electroni...It is a challenge to obtain highly tunable multifunctional performances in one ferroelectric system by a simple approach to meet the miniaturization,integration,and functionalization requirements of advanced electronic components.Herein,rare earth erbium(Er)modulated 0.9K_(0.5)Na_(0.5)NbO_(3)-0.1Sr(1-x)Er_(x)Ti_((1-x/4))O_(3),(0.9KNN-0.1ST:xEr)transparent-photoluminescent-ferroelectric energy storage multifunctional ceramics are prepared to solve this problem.The effect of lattice distortion and oxygen vacancies by Er doping on the optical and electrical properties is systematically investigated.The Er^(3+)ions can introduce a large distortion of the NbO_(6) octahedron by replacing the A-site in KNN-based ceramics.Thanks to the higher c/a ratio and lower oxygen vacancy content are simultaneously obtained in 0.9KNN-0.1ST:0.1Er ceramics.The effective energy storage density(Wrec)of 0.86 J/cm^(3),excellent near-infrared transmittance of 51.7%(1100 nm)and strong green upconversion photoluminescence are achieved in this multifunctional ceramic.This study provides a solid basis for rare earth ions doped ferroelectric ceramics with tunable multifunctional properties and has significant potential for applications in optoelectronic devices.展开更多
All-inorganic heterostructures have attracted intense interest for new energy and environmental applications recently,especially in photoelectronic devices.Herein,we firstly obtain a novel CoIn_(2)S_(4) thiospinel oct...All-inorganic heterostructures have attracted intense interest for new energy and environmental applications recently,especially in photoelectronic devices.Herein,we firstly obtain a novel CoIn_(2)S_(4) thiospinel octahedron through a simple one-step hydrothermal synthesis method.On this basis we further propose a strategy to prepare all-inorganic heterostructures(NH_(4))4Co^(Ⅱ)[Co^(Ⅱ)W_(12)O_(40)]·20H_(2)O/CoIn_(2)S_(4)(CoW_(12)-n/CoIn_(2)S_(4),where n represents the molar number of CoW_(12))through doping Keggin-type polyoxometalates(POMs).The addition of POMs can alleviate the cross-growth of the CoIn_(2)S_(4) octahedron and increase the specific surface area and the number of exposed active sites of the heterostructures.What’s more,we investigate the electrocatalytic triiodide reduction properties of the heterostructures.Electrochemical measurements show that POM contents have an obvious influence on the catalytic activity of this heterostructure catalyst.The CoW_(12)-0.3/CoIn_(2)S_(4) heterostructures present the best catalytic performance and the lowest charge transfer resistance.Consequently,the dye-sensitized solar cells(DSSCs)with CoW_(12)-0.3/CoIn_(2)S_(4) heterostructures as a counter electrode(CE)show the highest photovoltaic conversion efficiency(PCE)of up to 6.79%,superior to that of the Pt CE(5.83%).This work not only provides an approach for designing composites for efficient electrocatalytic triiodide reduction,but also represents a further step towards the application of all-inorganic heterostructures in photoelectronic devices.展开更多
The development of inexpensive and effective electrocatalysts is significant for large-scale application of renewable and clean energy.Herein,a sequence of bifunctional catalysts are successfully synthesized by the di...The development of inexpensive and effective electrocatalysts is significant for large-scale application of renewable and clean energy.Herein,a sequence of bifunctional catalysts are successfully synthesized by the direct pyrolysis reaction of copper–nickel coexisting metal–organic framework precursors(CuNi-BTC,BTC=1,3,5-benzenetricarboxylic acid).展开更多
基金NSF of China(10231010)NSF of Chongqing EducationCommittee(071105)NSF of SXXYYB(070X)
文摘A new case configuration in R^3, the conjugate-nest consisted of one regular tetrahedron and one regular octahedron is discussed. If the configuration is a central configuration, then all masses of outside layer are equivalent, the masses of inside layer are also equivalent. At the same time the following relation between ρ（r =√3/3ρ is the radius ratio of the sizes） and mass ratio τ=~↑m/m must be satisfied τ=~↑m/m=ρ（ρ＋3）（3＋2ρ＋ρ^2）^-3/2＋ρ（-ρ＋3）（3-2ρ＋ρ^2）^-3/2-4.2^-3/2ρ^-2-^-1ρ^-2/2（1＋ρ）（3＋2ρ＋ρ^2）^-3/2＋2（ρ-1）（3-2ρ＋ρ^2）^-3/2-4（2√2）^-3ρ, and for any mass ratio τ, when mass ratio r is in the open interval （0, 0.03871633950 ... ）, there exist three central configuration solutions（the initial configuration conditions who imply hamagraphic solutions） corresponding radius ratios are r1, r2, and r3, two of them in the interval （2.639300779… , ＋∞） and one is in the interval （0.7379549890…, 1.490942703… ）. when mass ratio τ is in the open interval （130.8164950… , ＋∞）, in the same way there have three corresponding radius ratios, two of them in the interval （0, 0.4211584789... ） and one is in the interval （0.7379549890…, 1.490942703…）. When mass ratio τ is in the open interval （0.03871633950…, 130.8164950…）, there has only one solution r in the interval （0.7379549890…, 1.490942703… ）.
基金supported by the National Natural Science Foundation of China(Nos.22175087 and 22075133)the Jiangsu Provincial Funds(No.BX2022013)for the financial support.
文摘Nanozymes,which possess enzyme-like catalytic activity,are attractive alternatives to natural enzymes.Their activity is largely dependent on the structure of the material.However,challenges remain in optimizing the structure-activity relationship.This work explores the synthesis and utilization of PtCu nanostructures(NSs),focusing on their peroxidase(POD)-like properties and their potential as antibacterial agents.We developed PtCu dendrites that transform into unique dendroframe octahedrons(DFOs)and subsequently stabilize into solid octahedrons with unusual growth behaviour.The intermediate DFO,showed higher POD-like activity in comparison to other shapes of PtCu NSs.The DFOs also have the better ability to consume glutathione,thus enhancing their sterilization effect.Furthermore,we demonstrate the effectiveness of these PtCu DFOs as powerful antibacterial agents.This work provides valuable information on shape dependent activities of PtCu NSs in the field of biomedicine.
文摘Three-dimensional （3D） porous V2O5 octahedrons have been successfully fabricated via a solid-state conversion process of freshly prepared ammonium vanadium oxide （AVO） octahedrons. The formation of AVO octahedrons is a result of the selective adsorption of capping reagents and the favourable supersaturation of growth species. Subsequently, 3D porous V2O5 octahedrons were obtained by simple thermolysis of the AVO octahedrons via a calcination treatment. As cathode material for lithium batteries, the porous V2O5 octahedron cathode exhibits a capacity of 96 mAh·g^-1 at high rate up to 2 A·g^-1 in the rang of 2.4 4 V and excellent cyclability with little capacity loss after 500 cycles, which can be ascribed to its high specific surface area and tunable pore architecture. Importantly, this facile solid-state thermal conversion strategy can be easily extended to controllably fabricate other porous metal oxide micro/nano materials with specific surface textures and morphologies.
基金supported by the National Natural Science Foundation of China(51502054)the Postdoctoral Science Foundation of China(2014M551236)the Postdoctoral Science Foundation of Heilongjiang Province(LBH-Z14083).
文摘Multiferroic BiFeO_(3)-based ceramics were synthesized using the rapid liquid-phase sintering method.The rare-earth ion(Sm^(3+),Gd^(3+),Y^(3+))doping causes structural distortion without changing the intrinsic rhombohedral perovskite structure.Raman analysis shows that the effect of doping on E modes is greater than A1 modes,and the microstructure of FeO_(6) octahedron can be regulated by ion doping.A-site trivalent ion doped ceramics exhibit improved magnetism compared with pure BiFeO_(3) ceramic,which originated from the suppressed spiral spin structure of Fe ions.The tilt of FeO_(6) octahedron as a typical structure instability causes the anomalous change of the imaginary part of permittivity at high frequency,and doped ceramics exhibit natural resonance around 16-17 GHz.
基金Genetic Engineering of Precious Metal Materials in Yunnan Province(I)-Construction and Application of Precious Metal Materials Professional Database(I),Grant/Award Number:202002AB080001-1National Natural Science Foundation of China,Grant/Award Numbers:91964204,61874129,61874178,61904189+2 种基金Science and Technology Council of Shanghai,Grant/Award Numbers:20501120300,18DZ2272800Shanghai Sailing Program,Grant/Award Number:19YF1456100the National Key Research and Development Program of China,Grant/Award Numbers:2017YFA0206101,2018YFB0407500。
文摘Phase-change memory(PCM)has been developed for three-dimensional(3D)data storage devices,posing huge challenges to the thermal stability and reliability of PCM.However,the low thermal stability of Ge2Sb2Te5(GST)limits further application.Here,we demonstrate PCM based on In0.9Ge2Sb2Te5(IGST)alloy,showing 180C 10-years data retention,6 ns set speed,one order of magnitude longer life time,and 75%reduced power consumption compared to GST-based device.The In can occupy the cationic positions and the In-Te octahedrons with good phase-change properties can geometrically match well with the host Ge-Te and Sb-Te octahedrons,acting as nucleation centers to boost the set speed and enhance the endurance of IGST device.Introducing stable matched phase-change octahedrons can be a feasible way to achieve practical PCMs.
基金supported by the National Natural Science Foundation of China(Grant No.11820101003)the Ministry of Science&Technology(Grant Nos.2018YFA0305701,2017YFA0302901,and 2016YFA0300301)
文摘Since the historical discovery of high Tc superconductivity(HTS)of La2CuO4 in 1986[1],the superconductivity me chanism of copper oxides remains one of the biggest mysteries in the field of condensed matter physics[2-10].High-Tc cuprates crystallize into layered perovskite structure,as well as copper oxygen octahedron coordination.In octahedron symmetry,the 3d orbitals of Cu^2+with a 3d^9 configuration degenerate into two top eg and three lower t2g orbitals.
基金supported by the National Natural Science Foundation of China(Grants No.52162019,No.51802140,No.52202136,No.12174174)the Natural Science Foundation of Jiangxi Province(Grant No.20212ACB214011).L.S.expresses thanks for the support from Nanchang University.
文摘It is a challenge to obtain highly tunable multifunctional performances in one ferroelectric system by a simple approach to meet the miniaturization,integration,and functionalization requirements of advanced electronic components.Herein,rare earth erbium(Er)modulated 0.9K_(0.5)Na_(0.5)NbO_(3)-0.1Sr(1-x)Er_(x)Ti_((1-x/4))O_(3),(0.9KNN-0.1ST:xEr)transparent-photoluminescent-ferroelectric energy storage multifunctional ceramics are prepared to solve this problem.The effect of lattice distortion and oxygen vacancies by Er doping on the optical and electrical properties is systematically investigated.The Er^(3+)ions can introduce a large distortion of the NbO_(6) octahedron by replacing the A-site in KNN-based ceramics.Thanks to the higher c/a ratio and lower oxygen vacancy content are simultaneously obtained in 0.9KNN-0.1ST:0.1Er ceramics.The effective energy storage density(Wrec)of 0.86 J/cm^(3),excellent near-infrared transmittance of 51.7%(1100 nm)and strong green upconversion photoluminescence are achieved in this multifunctional ceramic.This study provides a solid basis for rare earth ions doped ferroelectric ceramics with tunable multifunctional properties and has significant potential for applications in optoelectronic devices.
基金financially supported by the National Natural Science Foundation of China(No.21871041 and 21801038)the Natural Science Foundation of Jilin Province(No.20180101298JC)+1 种基金the Technology Foundation for Selected Overseas Chinese Scholars of Personnel Ministry of ChinaScience and Technology Activities Project Preferential Funding for Selected Overseas Chinese Scholars of Jilin Province Human Resources and Social Bureau.
文摘All-inorganic heterostructures have attracted intense interest for new energy and environmental applications recently,especially in photoelectronic devices.Herein,we firstly obtain a novel CoIn_(2)S_(4) thiospinel octahedron through a simple one-step hydrothermal synthesis method.On this basis we further propose a strategy to prepare all-inorganic heterostructures(NH_(4))4Co^(Ⅱ)[Co^(Ⅱ)W_(12)O_(40)]·20H_(2)O/CoIn_(2)S_(4)(CoW_(12)-n/CoIn_(2)S_(4),where n represents the molar number of CoW_(12))through doping Keggin-type polyoxometalates(POMs).The addition of POMs can alleviate the cross-growth of the CoIn_(2)S_(4) octahedron and increase the specific surface area and the number of exposed active sites of the heterostructures.What’s more,we investigate the electrocatalytic triiodide reduction properties of the heterostructures.Electrochemical measurements show that POM contents have an obvious influence on the catalytic activity of this heterostructure catalyst.The CoW_(12)-0.3/CoIn_(2)S_(4) heterostructures present the best catalytic performance and the lowest charge transfer resistance.Consequently,the dye-sensitized solar cells(DSSCs)with CoW_(12)-0.3/CoIn_(2)S_(4) heterostructures as a counter electrode(CE)show the highest photovoltaic conversion efficiency(PCE)of up to 6.79%,superior to that of the Pt CE(5.83%).This work not only provides an approach for designing composites for efficient electrocatalytic triiodide reduction,but also represents a further step towards the application of all-inorganic heterostructures in photoelectronic devices.
基金financial support from the National Science Foundation of China(Grant No.11674398)the fund of the State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals(SKL-SPM-201808).
文摘The development of inexpensive and effective electrocatalysts is significant for large-scale application of renewable and clean energy.Herein,a sequence of bifunctional catalysts are successfully synthesized by the direct pyrolysis reaction of copper–nickel coexisting metal–organic framework precursors(CuNi-BTC,BTC=1,3,5-benzenetricarboxylic acid).
