Smart hydrogels are environmentally sensitive hydrogels, which can produce a sensitive response to external stimuli, and often exhibit the characteristics of multi filed coupling. In this paper, a hydrogel rod under c...Smart hydrogels are environmentally sensitive hydrogels, which can produce a sensitive response to external stimuli, and often exhibit the characteristics of multi filed coupling. In this paper, a hydrogel rod under chemomechanical coupling was analytically studied based on a poroelastical model. The already known constitutive and governing equations were simplified into the one dimensional case, then two different boundary conditions were considered. The expressions of concentration, displacement,chemical potential and stress related to time were obtained in a series form. Examples illustrate the interaction mechanism of chemical and mechanical effect. It was found that there was a balance state in the diffusion of concentration and the diffusion process could lead to the expansion or the stress change of the hydrogel rod.展开更多
The analytical structures and the corresponding mathematical properties of the one dimensional and two dimensional fuzzy controllers are first investigated in detail. The nature of these two kinds of fuzzy controllers...The analytical structures and the corresponding mathematical properties of the one dimensional and two dimensional fuzzy controllers are first investigated in detail. The nature of these two kinds of fuzzy controllers is next probed from the perspective of control engineering. For the one dimensional fuzzy controller, it is concluded that this controller is a combination of a saturation element and a nonlinear proportional controller, and the system that employs the one dimensional fuzzy controller is the combination of an open-loop control system and a closedloop control system. For the latter case, it is concluded that it is a hybrid controller, which comprises the saturation part, zero-output part, nonlinear derivative part, nonlinear proportional part, as well as nonlinear proportional-derivative part, and the two dimensional fuzzy controller-based control system is a loop-varying system with varying number of control loops.展开更多
This paper shows that for a supercritical contact process in one dimension, if the initial distribution satisfies reasonable hypothesis, then the first hitting time of certain set with anomalous small density is asymp...This paper shows that for a supercritical contact process in one dimension, if the initial distribution satisfies reasonable hypothesis, then the first hitting time of certain set with anomalous small density is asymptotically exponentially distributed. We also show the similar result for the contact process on the finite set [0, N].展开更多
Based on Marcuse’s thought of“one-dimensional person”,this paper discusses the influence of TV talent show on teenagers’socialization.By analyzing the characteristics of TV talent shows that emphasize individual c...Based on Marcuse’s thought of“one-dimensional person”,this paper discusses the influence of TV talent show on teenagers’socialization.By analyzing the characteristics of TV talent shows that emphasize individual competition and success,appearance and image,and instant satisfaction,it is pointed out that these characteristics are easy for teenagers to produce the mentality of pursuing fame and fortune,appearance,and instant satisfaction,ignoring the development of other important values and qualities.Therefore,we need to guide teenagers to maintain a critical attitude toward TV talent shows,and pay attention to cultivating their independent thinking and all-round development.展开更多
In recent years,the research on superconductivity in one-dimensional(1D)materials has been attracting increasing attention due to its potential applications in low-dimensional nanodevices.However,the critical temperat...In recent years,the research on superconductivity in one-dimensional(1D)materials has been attracting increasing attention due to its potential applications in low-dimensional nanodevices.However,the critical temperature(T_(c))of 1D superconductors is low.In this work,we theoretically investigate the possible high T_(c) superconductivity of(5,5)carbon nanotube(CNT).The pristine(5,5)CNT is a Dirac semimetal and can be modulated into a semiconductor by full hydrogenation.Interestingly,by further hole doping,it can be regulated into a metallic state with the sp^(3)-hybridized σ electrons metalized,and a giant Kohn anomaly appears in the optical phonons.The two factors together enhance the electron–phonon coupling,and lead to high-T_(c) superconductivity.When the hole doping concentration of hydrogenated-(5,5)CNT is 2.5 hole/cell,the calculated T_(c) is 82.3 K,exceeding the boiling point of liquid nitrogen.Therefore,the predicted hole-doped hydrogenated-(5,5)CNT provides a new platform for 1D high-T_(c) superconductivity and may have potential applications in 1D nanodevices.展开更多
In this work,the Ba_(9)Sn_(3)Te_(15)compound has been synthesized for the first time under high pressure and high temperature conditions.Single-crystal X-ray diffraction analysis shows that Ba_(9)Sn_(3)Te_(15)crystall...In this work,the Ba_(9)Sn_(3)Te_(15)compound has been synthesized for the first time under high pressure and high temperature conditions.Single-crystal X-ray diffraction analysis shows that Ba_(9)Sn_(3)Te_(15)crystallizes into a hexagonal structure with a space group of P6c2(188)and lattice parameters of a=b=10.2403(1)A,and c=20.7720(2)A.The crystal structure contains trimeric one-dimensional chains with face-sharing SnTe6 octahedrons stacked along the c-axis.These chains are arranged in a triangular lattice in the ab plane.展开更多
Constructing one-dimensional(1D)hierarchical photocatalysts is deemed to be central to promoting photocatalytic capacity.In this paper,1D hierarchical structures composed of CdS nanosheets/nanoparticles on Ag nanowire...Constructing one-dimensional(1D)hierarchical photocatalysts is deemed to be central to promoting photocatalytic capacity.In this paper,1D hierarchical structures composed of CdS nanosheets/nanoparticles on Ag nanowires(denoted as 1D Ag@CdS core-shell hierarchical hetero-nanowires)have been fabricated via a wet-chemistry approach at low temperature.The optimization of the synthetic parameters indicates that the amounts of Cd(NO_(3))_(2)·4H_(2)O and thiourea play important roles in the construction of the 1D hierarchical structures.The as-prepared 1D hierarchical Ag@CdS core-shell hetero-nanowires exhibit efficient photocatalytic performance in both methyl orange(MO)degradation(degrade 96% of MO within 240 min)and hydrogen generation(73.5μmol h^(-1))from water splitting due to the unique hybrid nanoarchitecture.It is expected that this Ag@CdS hierarchical nanostructure could have potential in solar energy conversion and this fabrication technique could be used as a reference to design other 1D metal@semiconductor core-shell heteronanowires.展开更多
In this paper,we consider the one dimensional third order p-Laplacian equation(Фp(u″))′+h(t)f(t,u(t))=0 with integral boundary conditions u(0)-αu′(0)=∫_(0)^(1) g1(s)u(s)ds,u(1)+βu′(1)=∫_(0)^(1)g2(s)u(s)ds,u″...In this paper,we consider the one dimensional third order p-Laplacian equation(Фp(u″))′+h(t)f(t,u(t))=0 with integral boundary conditions u(0)-αu′(0)=∫_(0)^(1) g1(s)u(s)ds,u(1)+βu′(1)=∫_(0)^(1)g2(s)u(s)ds,u″(0)=0.By using kernel functions and the Avery-Peterson fixed point theorem,we establish the existence of at least three positive solutions.展开更多
1D europium coordination polymer wires were successfully prepared by reacting europium chloride with tributyl phosphate(TBP) at 160 oC for 12 h. The products were characterized by XRD,IR,TG,DTA,SEM,and EDS. SEM result...1D europium coordination polymer wires were successfully prepared by reacting europium chloride with tributyl phosphate(TBP) at 160 oC for 12 h. The products were characterized by XRD,IR,TG,DTA,SEM,and EDS. SEM results showed that the wires were with diameters ranging from several hundreds of nanometers to ～5 μm and lengths going up to several hundreds of micrometers. Influencing factors such as the dosage of reactants and reaction time on the preparation were systematically investigated. Strong emission centering at 590 nm was realized in the coordination polymer wires on excitation at 395 nm.展开更多
Cu-Zn-Al alloy of one dimensional nano-structure was prepared and thestructure of obtained nano-material was characterized by transmission electron microscope (TEM). Itwas shown that there are non-linear oscillations ...Cu-Zn-Al alloy of one dimensional nano-structure was prepared and thestructure of obtained nano-material was characterized by transmission electron microscope (TEM). Itwas shown that there are non-linear oscillations on the surface of Cu-Zn-Al alloy and theconsanguineous connection exists between non-linear oscillation and the growth process of onedimensional nano-structure. The diameter of one dimensional nano-structure is about 40 nm, and theratio of length to diameter is over 40. Finally, the growth mechanism of one dimensionalnano-structure was also studied.展开更多
A facile method is reported to controllably fabricate one dimensional （1D） polymer nan,astructures via metallogel template polymerization. The metallogel was prepared through coordination interactions between silver...A facile method is reported to controllably fabricate one dimensional （1D） polymer nan,astructures via metallogel template polymerization. The metallogel was prepared through coordination interactions between silver ions and a ligand （L） bearing three pyridyl groups in tetrahydrofuran （THF）. The diameters of the metallogel nanofibers could be tuned by the gel concentration （GC）. Due to its high thermal stability and facility of removal, the metallogel was used as the template for radical polymerization of diacryolyl-2,6-diaminopyridine （DADAP） to form poly-diacryolyl-2,6-diaminopyridine （PDADAP） nanostructures. The gradually eroding of the templates by PDADAP provided us an effective way to fabricate various nanostructures of the polymer. We have demonstrated that different 1D nanostructures, including n^noribbons, nanotubes and nanowires, could be selectively fabricated by adjusting polymerization time, monomer concentration and GC. The rheological properties of the gel samples were tested by a rheometer. As prolonging the reaction time, more and more polymers were formed and the strength of the resulting polymer gels became higher and higher. The simple preparation process, easy controlled microstructures and adequate gel strength would make it a facile synthetic method for different 1D polymer nanosturctures.展开更多
The reactions of 18 crown 6 with each of K 2(M=Zn, Hg; mnt=1,2 dicyanoethene 1,2 dithiolate, C 2S 2(CN) 2- 2) were studied and novel complexes [K(18 C 6)] 2[Zn(mnt) 2](1) and [K(18 C 6)] 2[Hg(mnt)...The reactions of 18 crown 6 with each of K 2(M=Zn, Hg; mnt=1,2 dicyanoethene 1,2 dithiolate, C 2S 2(CN) 2- 2) were studied and novel complexes [K(18 C 6)] 2[Zn(mnt) 2](1) and [K(18 C 6)] 2[Hg(mnt) 2](2) were characterized by elemental analysis, IR spectrum and X ray diffraction analysis. Complex 1 displays a one dimensional chain of [K(18 C 6)] 2[Zn(mnt) 2] bridged by K O interactions between adjacent [K(18 C 6)] + units. Complex 2 is also a one dimensional chain of [K(18 C 6)] 2[Hg(mnt) 2] bridged by K...S weak interactions between adjacent [K(18 C 6)] + and [Hg(mnt) 2] 2- .展开更多
The variation of effective stress ratio of stratfied soil with semi pervious boundaries and under cyclic loading was analyzed on the basis of Terzaghi's one dimensional consolidation assumptions. A solution by L...The variation of effective stress ratio of stratfied soil with semi pervious boundaries and under cyclic loading was analyzed on the basis of Terzaghi's one dimensional consolidation assumptions. A solution by Laplace Transform was obtained for the case when the soil was under time varied loading. With numerical inversion of Laplace Transform, some useful results were obtained for several kinds of commonly encountered loadings. The results can be meaningful in engineering practice.展开更多
In this work,one-dimensional(1D)α-MoO_(3)nanobelts and Zr-dopedα-MoO_(3)nanobelts were facilely prepared via a simple hydrothermal method,and the gas sensing performance of the obtained products towards xylene vapor...In this work,one-dimensional(1D)α-MoO_(3)nanobelts and Zr-dopedα-MoO_(3)nanobelts were facilely prepared via a simple hydrothermal method,and the gas sensing performance of the obtained products towards xylene vapor was tested systematically.The characterization results showed that Zr was successfully doped into the lattice of α-MoO_(3)without destroying the unique 1D nanobelt structure and existed as ball-like nanostructures scattered on the nanobelts.The data from the gas sensing test demonstrated that the Zr-doped α-MoO_(3)-based sensor exhibited superior sensing performance with the response towards 100 ppm xylene at the optimum operating temperature of 206℃ reaching 7.99,which was nearly threefold greater compared with that of the pristine α-MoO_(3)-based sensor.Besides,the Zr-doped α-MoO_(3)-based sensor possessed excellent selectivity and a low detection limit.The enhanced sensing performance could be attributed to the 1D nanostructure and the doped Zr.The mechanism of the enhancement of sensing properties induced by the Zr-doping strategy was also demonstrated specifically.展开更多
A series of isomorphic salts[CN-BzPy][Cu_(x)Ni_(1−x)(mnt)_(2)](x=0–1;CN-BzPy^(+)=1-(4′-cyanobenzyl)pyridinium,mnt^(2−)=maleonitriledithiolate)were prepared and characterized by microanalysis(C,H and N elements),IR a...A series of isomorphic salts[CN-BzPy][Cu_(x)Ni_(1−x)(mnt)_(2)](x=0–1;CN-BzPy^(+)=1-(4′-cyanobenzyl)pyridinium,mnt^(2−)=maleonitriledithiolate)were prepared and characterized by microanalysis(C,H and N elements),IR and Raman spectroscopy,TG,and powder X-ray diffraction techniques.All salts crystallize in the monoclinic space group P2_(1)/n with similar cell parameters,and both[M(mnt)_(2)]−(M=Ni or Cu)anions and CN-BzPy^(+)cations form segregated and regular stacks.展开更多
A viologen derivative-and a carboxylic acid-based one-dimensional(1D)cocrystal Zn(Ⅱ)coordination polymer,{[Zn(bcbpy)_(2)][Zn(sip)Cl]·4H_(2)O}_(n)(1,bcbpy=1,1’-bis(3-carboxybenzyl)-4,4’-bipyridinium,sip=5-sulfo...A viologen derivative-and a carboxylic acid-based one-dimensional(1D)cocrystal Zn(Ⅱ)coordination polymer,{[Zn(bcbpy)_(2)][Zn(sip)Cl]·4H_(2)O}_(n)(1,bcbpy=1,1’-bis(3-carboxybenzyl)-4,4’-bipyridinium,sip=5-sulfoisophthalate),has been produced solvothermally and structurally characterized.Complex 1 comprises two cationic chains(Chain-1)and one anionic chain(Chain-2)that cross each other and grow into a 3D supramolecular structure through hydrogen bonding interactions.Notably,under UV 365 nm irradiation,1 showed a noteworthy photochromic transition between colorless and deep blue,which should be attributed to the generation of viologen radicals.Interestingly,it exhibited a two-step coloring phenomenon when heated,with the color changing to yellow and brown at 230℃and 250℃,respectively.Furthermore,1 demonstrated selective gas-chromic behavior toward ethylamine(EA),and it is recoverable by washing with MeCN.Furthermore,1 can be deposited on filter paper and demonstrates a potential application as an inkless print material.Interestingly,when complex 1 is removed from liquid nitrogen,as the temperature rises from 80 to 290 K,it exhibits a yellow green afterglow.In addition,the production of polyvinyl alcohol(PVA)film,1-PVA,has made the photochromism of 1 practical in ink-free printing,UV detection,and information anti-counterfeiting,and it is confirmed that the photochromic properties of viologen complex can be improved in PVA medium.展开更多
A series of chalcogenide compounds with various compositions,i.e.,octanuclear or tetranuclear Zn-S clusters,have been synthesised in a straighforward manner.Different fused-ring aromatic ligands were used as capping l...A series of chalcogenide compounds with various compositions,i.e.,octanuclear or tetranuclear Zn-S clusters,have been synthesised in a straighforward manner.Different fused-ring aromatic ligands were used as capping ligands and the corresponding zero-dimensional(0D)products were obtained.On the other hand,use of bridging ligands led to a family of one-dimensional(1D)coordination polymers,and an in situ ligand reaction has been observed in[Zn_(8)S(SC_(6)H_(5))_(13)L_(1)(H_(2)O)]·2H_(2)O(L=3-carboxypryidyl)due to the hydrolysis of the cyano group of 3-pyridinecarbonitrile.A very rare 1D helical-chain structure was observed in[Zn_(4)(SC_(6)H_(5))_(8)L_(1)](L=4,4’-bipyridyl),providing evidence of the character of bridging organic ligands in the corresponding crystalline materials.First-principles calculations on[Zn_(4)(SC_(6)H_(5))_(8)L_(1)](L=4,4’-bipyridyl)further revealed that the two cluster units could rotate freely about the C-C single bond over a broad range,eventually leading to the formation of a one-dimensional helical structure.展开更多
Carbon anode materials for Li-ion batteries have been operated close to their theoretical rate and cycle limits.Therefore,titanium-based materials have attracted great attention due to their high stability.Here,Na_(2)...Carbon anode materials for Li-ion batteries have been operated close to their theoretical rate and cycle limits.Therefore,titanium-based materials have attracted great attention due to their high stability.Here,Na_(2)Li_(2)Ti_(6)O_(14)nanofibers as anode materials were prepared through a controlled electrospinning method.The Na_(2)Li_(2)Ti_(6)O_(14)nanofibers presented superior electrochemical performance with high rate capability and long cycle life and can be regarded as a competitive anode candidate for advanced Li-ion batteries.One-dimensional(1D)Na_(2)Li_(2)Ti_(6)O_(14)nanofibers are able to deliver a capacity of 128.5 mA h g^(-1)at 0.5C,and demonstrate superior high-rate charge-discharge capability and cycling stability(the reversible charge capacity is 77.8 mA h g^(-1)with a capacity retention of 99.45%at the rate of 10C after 800 cycles).The 1D structure is considered to contribute remarkably to increased rate capability and stability.This simple and scalable method indicates that the Na_(2)Li_(2)Ti_(6)O_(14)nanofibers have a practical application potential for high performance lithium-ion batteries.展开更多
Developing new birefringent materials with large optical anisotropy is extremely urgent due to the fantastic progress of laser science and technology.Here,two tin(Ⅱ)-based oxalates,K_(2)Sn(C_(2)O_(4))_(2)·H_(2)O...Developing new birefringent materials with large optical anisotropy is extremely urgent due to the fantastic progress of laser science and technology.Here,two tin(Ⅱ)-based oxalates,K_(2)Sn(C_(2)O_(4))_(2)·H_(2)O and K_(2)Sn_(2)(C_(2)O_(4))_(2)F_(2)·H_(2)O,were successfully synthesized by simultaneously introducingπ-conjugated[C_(2)O_(4)]^(2)-groups and distorted Sn^(2+)-polyhedra with stereochemically active lone pairs.展开更多
Engineering ideal functional coordination polymers(CPs)via post-synthetic modification has emerged as a powerful synthetic strategy to achieve desirable functionalities and superior properties.In this work,we report a...Engineering ideal functional coordination polymers(CPs)via post-synthetic modification has emerged as a powerful synthetic strategy to achieve desirable functionalities and superior properties.In this work,we report a versatile ligand-strain modulation strategy that harnesses ligand strain to modify the skeleton conformation of CPs by metal node exchange.A one-dimensional(1D)crystalline CP,Ag(I)-L,featuring a curved ligand geometry,is prepared through a direct synthesis route.Exploiting polarization differences between different metal ions,we successfully regulate the ligand strain,enabling a metal node exchange process that yields another crystalline CP,Cu(I)-L,exhibiting a distinct linear parallel ligand orientation.Significantly,the complete exchange of AgNO_(3) to CuI is achieved via solid-liquid contact,while only partial exchange occurs under grinding.This ligand-strain engineering strategy will open new avenues in constructing functional systems and supramolecular materials through dynamic metal exchange and ligand-strain control.展开更多
基金financial supports from the National Natural Science Foundation of China (Grants 11472020, 11502007, and 11632005)Hong Kong Scholars Program (Grant XJ2016021)
文摘Smart hydrogels are environmentally sensitive hydrogels, which can produce a sensitive response to external stimuli, and often exhibit the characteristics of multi filed coupling. In this paper, a hydrogel rod under chemomechanical coupling was analytically studied based on a poroelastical model. The already known constitutive and governing equations were simplified into the one dimensional case, then two different boundary conditions were considered. The expressions of concentration, displacement,chemical potential and stress related to time were obtained in a series form. Examples illustrate the interaction mechanism of chemical and mechanical effect. It was found that there was a balance state in the diffusion of concentration and the diffusion process could lead to the expansion or the stress change of the hydrogel rod.
基金This project was supported by the fundation of the Academy of Finland (201353)
文摘The analytical structures and the corresponding mathematical properties of the one dimensional and two dimensional fuzzy controllers are first investigated in detail. The nature of these two kinds of fuzzy controllers is next probed from the perspective of control engineering. For the one dimensional fuzzy controller, it is concluded that this controller is a combination of a saturation element and a nonlinear proportional controller, and the system that employs the one dimensional fuzzy controller is the combination of an open-loop control system and a closedloop control system. For the latter case, it is concluded that it is a hybrid controller, which comprises the saturation part, zero-output part, nonlinear derivative part, nonlinear proportional part, as well as nonlinear proportional-derivative part, and the two dimensional fuzzy controller-based control system is a loop-varying system with varying number of control loops.
基金Supported in part by the National Natural Science Foundation of China.
文摘This paper shows that for a supercritical contact process in one dimension, if the initial distribution satisfies reasonable hypothesis, then the first hitting time of certain set with anomalous small density is asymptotically exponentially distributed. We also show the similar result for the contact process on the finite set [0, N].
文摘Based on Marcuse’s thought of“one-dimensional person”,this paper discusses the influence of TV talent show on teenagers’socialization.By analyzing the characteristics of TV talent shows that emphasize individual competition and success,appearance and image,and instant satisfaction,it is pointed out that these characteristics are easy for teenagers to produce the mentality of pursuing fame and fortune,appearance,and instant satisfaction,ignoring the development of other important values and qualities.Therefore,we need to guide teenagers to maintain a critical attitude toward TV talent shows,and pay attention to cultivating their independent thinking and all-round development.
基金supported by the National Natural Science Foundation of China (Grant Nos.12074213 and 11574108)the Major Basic Program of Natural Science Foundation of Shandong Province (Grant No.ZR2021ZD01)the Natural Science Foundation of Shandong Province (Grant No.ZR2023MA082)。
文摘In recent years,the research on superconductivity in one-dimensional(1D)materials has been attracting increasing attention due to its potential applications in low-dimensional nanodevices.However,the critical temperature(T_(c))of 1D superconductors is low.In this work,we theoretically investigate the possible high T_(c) superconductivity of(5,5)carbon nanotube(CNT).The pristine(5,5)CNT is a Dirac semimetal and can be modulated into a semiconductor by full hydrogenation.Interestingly,by further hole doping,it can be regulated into a metallic state with the sp^(3)-hybridized σ electrons metalized,and a giant Kohn anomaly appears in the optical phonons.The two factors together enhance the electron–phonon coupling,and lead to high-T_(c) superconductivity.When the hole doping concentration of hydrogenated-(5,5)CNT is 2.5 hole/cell,the calculated T_(c) is 82.3 K,exceeding the boiling point of liquid nitrogen.Therefore,the predicted hole-doped hydrogenated-(5,5)CNT provides a new platform for 1D high-T_(c) superconductivity and may have potential applications in 1D nanodevices.
基金supported by NSFC and the National Basic Research Program of China.
文摘In this work,the Ba_(9)Sn_(3)Te_(15)compound has been synthesized for the first time under high pressure and high temperature conditions.Single-crystal X-ray diffraction analysis shows that Ba_(9)Sn_(3)Te_(15)crystallizes into a hexagonal structure with a space group of P6c2(188)and lattice parameters of a=b=10.2403(1)A,and c=20.7720(2)A.The crystal structure contains trimeric one-dimensional chains with face-sharing SnTe6 octahedrons stacked along the c-axis.These chains are arranged in a triangular lattice in the ab plane.
基金the Australian Research Council(ARC)through the Discovery Projects DP 130102274 and DP130102699 and from ISEM at UOWJiangsu Specially Appointed Professorship+2 种基金the Program of Jiangsu Innovative and Entrepreneurial Talentsthe use of the facilities in the UOW Electron Microscopy Centre,with particular thanks to David R.G.Mitchellsupport from the Jiangsu Provincial Key Laboratory of Radiation Medicine and Protection and the Priority Academic Development Program of Jiangsu Higher Education Institutions(PAPD).
文摘Constructing one-dimensional(1D)hierarchical photocatalysts is deemed to be central to promoting photocatalytic capacity.In this paper,1D hierarchical structures composed of CdS nanosheets/nanoparticles on Ag nanowires(denoted as 1D Ag@CdS core-shell hierarchical hetero-nanowires)have been fabricated via a wet-chemistry approach at low temperature.The optimization of the synthetic parameters indicates that the amounts of Cd(NO_(3))_(2)·4H_(2)O and thiourea play important roles in the construction of the 1D hierarchical structures.The as-prepared 1D hierarchical Ag@CdS core-shell hetero-nanowires exhibit efficient photocatalytic performance in both methyl orange(MO)degradation(degrade 96% of MO within 240 min)and hydrogen generation(73.5μmol h^(-1))from water splitting due to the unique hybrid nanoarchitecture.It is expected that this Ag@CdS hierarchical nanostructure could have potential in solar energy conversion and this fabrication technique could be used as a reference to design other 1D metal@semiconductor core-shell heteronanowires.
基金supported by the National Natural Science Foundation of China(No.12071491)。
文摘In this paper,we consider the one dimensional third order p-Laplacian equation(Фp(u″))′+h(t)f(t,u(t))=0 with integral boundary conditions u(0)-αu′(0)=∫_(0)^(1) g1(s)u(s)ds,u(1)+βu′(1)=∫_(0)^(1)g2(s)u(s)ds,u″(0)=0.By using kernel functions and the Avery-Peterson fixed point theorem,we establish the existence of at least three positive solutions.
基金Project supported by the China Postdoctoral Science Foundation (20100470841)the Natural Science Foundation of Jiangxi Province (2009GQH0057)
文摘1D europium coordination polymer wires were successfully prepared by reacting europium chloride with tributyl phosphate(TBP) at 160 oC for 12 h. The products were characterized by XRD,IR,TG,DTA,SEM,and EDS. SEM results showed that the wires were with diameters ranging from several hundreds of nanometers to ～5 μm and lengths going up to several hundreds of micrometers. Influencing factors such as the dosage of reactants and reaction time on the preparation were systematically investigated. Strong emission centering at 590 nm was realized in the coordination polymer wires on excitation at 395 nm.
基金This work was financially supported by the National Climbing Programme of China (No. 1999-444)the Natural Science Foundation of Tianjin (No.003805611 and 033610611) the Center of Liuhui Application Mathematics of Nankai University and Tianjin Univers
文摘Cu-Zn-Al alloy of one dimensional nano-structure was prepared and thestructure of obtained nano-material was characterized by transmission electron microscope (TEM). Itwas shown that there are non-linear oscillations on the surface of Cu-Zn-Al alloy and theconsanguineous connection exists between non-linear oscillation and the growth process of onedimensional nano-structure. The diameter of one dimensional nano-structure is about 40 nm, and theratio of length to diameter is over 40. Finally, the growth mechanism of one dimensionalnano-structure was also studied.
基金financially supported by the National Natural Science Foundation of China(Nos.20874055 and 21174079)Hi-tech Research and Development Program(863 plan) of China(No.2009AA062903)
文摘A facile method is reported to controllably fabricate one dimensional （1D） polymer nan,astructures via metallogel template polymerization. The metallogel was prepared through coordination interactions between silver ions and a ligand （L） bearing three pyridyl groups in tetrahydrofuran （THF）. The diameters of the metallogel nanofibers could be tuned by the gel concentration （GC）. Due to its high thermal stability and facility of removal, the metallogel was used as the template for radical polymerization of diacryolyl-2,6-diaminopyridine （DADAP） to form poly-diacryolyl-2,6-diaminopyridine （PDADAP） nanostructures. The gradually eroding of the templates by PDADAP provided us an effective way to fabricate various nanostructures of the polymer. We have demonstrated that different 1D nanostructures, including n^noribbons, nanotubes and nanowires, could be selectively fabricated by adjusting polymerization time, monomer concentration and GC. The rheological properties of the gel samples were tested by a rheometer. As prolonging the reaction time, more and more polymers were formed and the strength of the resulting polymer gels became higher and higher. The simple preparation process, easy controlled microstructures and adequate gel strength would make it a facile synthetic method for different 1D polymer nanosturctures.
文摘The reactions of 18 crown 6 with each of K 2(M=Zn, Hg; mnt=1,2 dicyanoethene 1,2 dithiolate, C 2S 2(CN) 2- 2) were studied and novel complexes [K(18 C 6)] 2[Zn(mnt) 2](1) and [K(18 C 6)] 2[Hg(mnt) 2](2) were characterized by elemental analysis, IR spectrum and X ray diffraction analysis. Complex 1 displays a one dimensional chain of [K(18 C 6)] 2[Zn(mnt) 2] bridged by K O interactions between adjacent [K(18 C 6)] + units. Complex 2 is also a one dimensional chain of [K(18 C 6)] 2[Hg(mnt) 2] bridged by K...S weak interactions between adjacent [K(18 C 6)] + and [Hg(mnt) 2] 2- .
文摘The variation of effective stress ratio of stratfied soil with semi pervious boundaries and under cyclic loading was analyzed on the basis of Terzaghi's one dimensional consolidation assumptions. A solution by Laplace Transform was obtained for the case when the soil was under time varied loading. With numerical inversion of Laplace Transform, some useful results were obtained for several kinds of commonly encountered loadings. The results can be meaningful in engineering practice.
基金National Natural Science Foundation of China(Grant No.61874048,11874348,U1831113,61974055)Project of Science and Technology Plan of Jilin Province(Grant No.20180414020GH)for the support to this work.
文摘In this work,one-dimensional(1D)α-MoO_(3)nanobelts and Zr-dopedα-MoO_(3)nanobelts were facilely prepared via a simple hydrothermal method,and the gas sensing performance of the obtained products towards xylene vapor was tested systematically.The characterization results showed that Zr was successfully doped into the lattice of α-MoO_(3)without destroying the unique 1D nanobelt structure and existed as ball-like nanostructures scattered on the nanobelts.The data from the gas sensing test demonstrated that the Zr-doped α-MoO_(3)-based sensor exhibited superior sensing performance with the response towards 100 ppm xylene at the optimum operating temperature of 206℃ reaching 7.99,which was nearly threefold greater compared with that of the pristine α-MoO_(3)-based sensor.Besides,the Zr-doped α-MoO_(3)-based sensor possessed excellent selectivity and a low detection limit.The enhanced sensing performance could be attributed to the 1D nanostructure and the doped Zr.The mechanism of the enhancement of sensing properties induced by the Zr-doping strategy was also demonstrated specifically.
基金financially supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions and the National Natural Science Foundation of China(grant no.22073047).
文摘A series of isomorphic salts[CN-BzPy][Cu_(x)Ni_(1−x)(mnt)_(2)](x=0–1;CN-BzPy^(+)=1-(4′-cyanobenzyl)pyridinium,mnt^(2−)=maleonitriledithiolate)were prepared and characterized by microanalysis(C,H and N elements),IR and Raman spectroscopy,TG,and powder X-ray diffraction techniques.All salts crystallize in the monoclinic space group P2_(1)/n with similar cell parameters,and both[M(mnt)_(2)]−(M=Ni or Cu)anions and CN-BzPy^(+)cations form segregated and regular stacks.
基金National Natural Science Foundation of China for financial support(21671022).
文摘A viologen derivative-and a carboxylic acid-based one-dimensional(1D)cocrystal Zn(Ⅱ)coordination polymer,{[Zn(bcbpy)_(2)][Zn(sip)Cl]·4H_(2)O}_(n)(1,bcbpy=1,1’-bis(3-carboxybenzyl)-4,4’-bipyridinium,sip=5-sulfoisophthalate),has been produced solvothermally and structurally characterized.Complex 1 comprises two cationic chains(Chain-1)and one anionic chain(Chain-2)that cross each other and grow into a 3D supramolecular structure through hydrogen bonding interactions.Notably,under UV 365 nm irradiation,1 showed a noteworthy photochromic transition between colorless and deep blue,which should be attributed to the generation of viologen radicals.Interestingly,it exhibited a two-step coloring phenomenon when heated,with the color changing to yellow and brown at 230℃and 250℃,respectively.Furthermore,1 demonstrated selective gas-chromic behavior toward ethylamine(EA),and it is recoverable by washing with MeCN.Furthermore,1 can be deposited on filter paper and demonstrates a potential application as an inkless print material.Interestingly,when complex 1 is removed from liquid nitrogen,as the temperature rises from 80 to 290 K,it exhibits a yellow green afterglow.In addition,the production of polyvinyl alcohol(PVA)film,1-PVA,has made the photochromism of 1 practical in ink-free printing,UV detection,and information anti-counterfeiting,and it is confirmed that the photochromic properties of viologen complex can be improved in PVA medium.
基金Financial support from the NSFC(21401077 and 21371078)the start-up fund of Jiaxing University is gratefully acknowledged.
文摘A series of chalcogenide compounds with various compositions,i.e.,octanuclear or tetranuclear Zn-S clusters,have been synthesised in a straighforward manner.Different fused-ring aromatic ligands were used as capping ligands and the corresponding zero-dimensional(0D)products were obtained.On the other hand,use of bridging ligands led to a family of one-dimensional(1D)coordination polymers,and an in situ ligand reaction has been observed in[Zn_(8)S(SC_(6)H_(5))_(13)L_(1)(H_(2)O)]·2H_(2)O(L=3-carboxypryidyl)due to the hydrolysis of the cyano group of 3-pyridinecarbonitrile.A very rare 1D helical-chain structure was observed in[Zn_(4)(SC_(6)H_(5))_(8)L_(1)](L=4,4’-bipyridyl),providing evidence of the character of bridging organic ligands in the corresponding crystalline materials.First-principles calculations on[Zn_(4)(SC_(6)H_(5))_(8)L_(1)](L=4,4’-bipyridyl)further revealed that the two cluster units could rotate freely about the C-C single bond over a broad range,eventually leading to the formation of a one-dimensional helical structure.
基金National Natural Science Foundation of China(21571110)Natural Science Foundation of Zhejiang Province(LY18B010003)+1 种基金Ningbo Key Innovation Team(2014B81005)K.C.Wong Magna Fund in Ningbo University。
文摘Carbon anode materials for Li-ion batteries have been operated close to their theoretical rate and cycle limits.Therefore,titanium-based materials have attracted great attention due to their high stability.Here,Na_(2)Li_(2)Ti_(6)O_(14)nanofibers as anode materials were prepared through a controlled electrospinning method.The Na_(2)Li_(2)Ti_(6)O_(14)nanofibers presented superior electrochemical performance with high rate capability and long cycle life and can be regarded as a competitive anode candidate for advanced Li-ion batteries.One-dimensional(1D)Na_(2)Li_(2)Ti_(6)O_(14)nanofibers are able to deliver a capacity of 128.5 mA h g^(-1)at 0.5C,and demonstrate superior high-rate charge-discharge capability and cycling stability(the reversible charge capacity is 77.8 mA h g^(-1)with a capacity retention of 99.45%at the rate of 10C after 800 cycles).The 1D structure is considered to contribute remarkably to increased rate capability and stability.This simple and scalable method indicates that the Na_(2)Li_(2)Ti_(6)O_(14)nanofibers have a practical application potential for high performance lithium-ion batteries.
基金supported by the National Natural Science Foundation of China(Grant No.22201195,22122106,22071158,and 21971171)Natural Science Foundation of Sichuan Province(2023NSFSC1066)the Fundamental Research Funds from Sichuan University(2021SCUNL101).
文摘Developing new birefringent materials with large optical anisotropy is extremely urgent due to the fantastic progress of laser science and technology.Here,two tin(Ⅱ)-based oxalates,K_(2)Sn(C_(2)O_(4))_(2)·H_(2)O and K_(2)Sn_(2)(C_(2)O_(4))_(2)F_(2)·H_(2)O,were successfully synthesized by simultaneously introducingπ-conjugated[C_(2)O_(4)]^(2)-groups and distorted Sn^(2+)-polyhedra with stereochemically active lone pairs.
基金the Natural Science Foundation of Jilin Province(No.20230101052JC)the National Natural Science Foundation of China(No.52173200)the Fundamental Research Funds for the Central Universities(No.2022-JCXK-13)for financial support.
文摘Engineering ideal functional coordination polymers(CPs)via post-synthetic modification has emerged as a powerful synthetic strategy to achieve desirable functionalities and superior properties.In this work,we report a versatile ligand-strain modulation strategy that harnesses ligand strain to modify the skeleton conformation of CPs by metal node exchange.A one-dimensional(1D)crystalline CP,Ag(I)-L,featuring a curved ligand geometry,is prepared through a direct synthesis route.Exploiting polarization differences between different metal ions,we successfully regulate the ligand strain,enabling a metal node exchange process that yields another crystalline CP,Cu(I)-L,exhibiting a distinct linear parallel ligand orientation.Significantly,the complete exchange of AgNO_(3) to CuI is achieved via solid-liquid contact,while only partial exchange occurs under grinding.This ligand-strain engineering strategy will open new avenues in constructing functional systems and supramolecular materials through dynamic metal exchange and ligand-strain control.
