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Dy和Y对ZK60镁合金铸态组织和力学性能的影响 被引量:4
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作者 刘楚明 彭小仙 +3 位作者 李慧中 陈志永 朱秀荣 王荣 《中南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2010年第4期1303-1309,共7页
利用光学显微镜、扫描电子显微镜、X线衍射分析及力学性能测试等手段,研究稀土元素Dy和Y对ZK60镁合金铸态显微组织及力学性能的影响。研究结果表明:在ZK60镁合金中单独添加质量分数为1%Dy和1%Y均能细化晶粒,Y的细化效果优于Dy的细化效果... 利用光学显微镜、扫描电子显微镜、X线衍射分析及力学性能测试等手段,研究稀土元素Dy和Y对ZK60镁合金铸态显微组织及力学性能的影响。研究结果表明:在ZK60镁合金中单独添加质量分数为1%Dy和1%Y均能细化晶粒,Y的细化效果优于Dy的细化效果;当同时添加Dy和Y时,细化效果最佳,合金的平均晶粒尺寸由原来的105μm减小至35μm,因此,合金的塑性都有不同程度的提高;单独添加Dy后,合金的抗拉强度下降,而单独添加Y后,合金的抗拉强度略有提高,同时添加Dy和Y后,由于Dy和Y原子之间相互交换作用,合金的抗拉强度、屈服强度和伸长率分别提高至210.2 MPa,115.6 MPa和8.6%,较未加稀土元素的ZK60镁合金分别提高5.3%,17.1%和177.4%;加入稀土Dy和Y后合金力学性能的变化主要与Dy和Y在合金中形成的I相和W相的比例有关。 展开更多
关键词 ZK60镁合金 DY Y 互换作用 显微组织 力学性能
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Effect of NH_4^+ exchange on CuY catalyst for oxidative carbonylation of methanol 被引量:4
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作者 王玉春 郑华艳 李忠 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第8期1403-1412,共10页
NaY and ion exchanged NaNH4Y zeolite with NH4NO3 were used as the support to prepare CuY cata‐lysts by a high temperature anhydrous interaction between the support and copper (II) acety‐lacetonate Cu(acac)2. The... NaY and ion exchanged NaNH4Y zeolite with NH4NO3 were used as the support to prepare CuY cata‐lysts by a high temperature anhydrous interaction between the support and copper (II) acety‐lacetonate Cu(acac)2. The catalysts were used for the oxidative carbonylation of methanol to dime‐thyl carbonate (DMC) at atmospheric pressure. The textural and acidic properties of NaNH4Y zeolite and the CuY catalysts were investigated by X‐ray diffraction, scanning electron microscopy, N2 ad‐sorption‐desorption, temperature programmed reduction of H2, X‐ray photoelectron spectroscopy and temperature programmed desorption of NH3. With increasing NH4NO3 concentration, the NH4+exchange degree increased while the crystallinity of the zeolite remained intact. Crystalline CuO was formed when the NH4+exchange degree of NaNH4Y was low, and the corresponding CuY catalyst showed low catalytic activity. With increasing of the NH4+exchange degree of NaNH4Y, the content of surface bound Cu+active centers increased and the catalytic activity of the corresponding CuY catalyst also increased. The surface bound Cu+content reached its maximum when the NH4+ex‐change degree of NaNH4Y reached towards saturation. The CuY exhibited optimal catalytic activity with 267.3 mg/(g·h) space time yield of DMC, 6.9%conversion of methanol, 68.5%selectivity of DMC. 展开更多
关键词 High temperature anhydrous interaction NH4+exchange degree CuY catalyst Oxidative carbonylation Dimethyl carbonate
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奥斯汀言语行为理论浅述 被引量:1
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作者 赵弼汉 《吉林师范大学学报(人文社会科学版)》 1997年第4期59-61,共3页
关键词 言语行为理论 奥斯汀 言外之力 施为动词 言外行为 命题内容 言后行为 反应语 语言环境 互换作用
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Characterization of coal using electron spin resonance: implications for the formation of inertinite macerals in the Witbank Coalfield, South Africa 被引量:3
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作者 Ofentse M. Moroeng Jonathan M. Keartland +1 位作者 R. James Roberts Nicola J. Wagner 《International Journal of Coal Science & Technology》 EI 2018年第3期385-398,共14页
Coal contains a significant concentration of free radicals as a result of the coalification process. One of the experimental methods sensitive to the presence of radicals is electron spin resonance (ESR), and differ... Coal contains a significant concentration of free radicals as a result of the coalification process. One of the experimental methods sensitive to the presence of radicals is electron spin resonance (ESR), and differences in ESR spectra for different macerals may provide insight into coal-forming processes. In this study, ESR data along with the H/C atomic ratio (to infer the aromatic fraction) are used to characterize coal samples with the aim of assessing a fire-origin for dominant inertinite macerals. A medium rank C bituminous Witbank No. 4 Seam Upper coal (the parent) was density- fractionated to create vitrinite-rich and inertinite-rich samples. The parent sample consists of 42 vol% vitrinite and 49 vol% inertinite. The density-fractionated samples comprise of 81 vol% total vitrinite (dominated by collotelinite and collodetrinite), and 63 vol% total inertinite (dominated by fusinite, semifusinite, and inertodetrinite). The H/C ratio is 0.74 for the inertinite-rich sample, and 0.85 for the vitrinite-rich counterpart, suggesting the former sample is more aromatic. The ESR spectra obtained for the three samples were found to fit best using a Lorentzian distribution. The fit is noticeably better for the aromatic inertinite-rich sample, for which the spectrum is symmetric. This is attributed to pronounced electron mobility and exchange interactions. The higher radical content of the inertinite-rich and parent samples is attributed to the presence of specific inertinite macerals, namely: fusinite, semifusinite, and inertodetrinite. And, owing to the greater radical content of the inertinite-rich sample, the dominant inertinite macerals are interpreted to have formed through charring of plant matter. 展开更多
关键词 Main Karoo Basin Radical contents Origin pathways CHARRING Fusinite Semifusinite
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Quantum Communication in Spin Chain with Multiple Spin Exchange Interaction 被引量:2
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作者 郝翔 朱士群 《Communications in Theoretical Physics》 SCIE CAS CSCD 2010年第6期1083-1086,共4页
The transmission of quantum states in the anisotropic Heisenberg XXZ chain model with three-spin exchange interaction is studied. The average fidelity is used to evaluate the state transfer. It is found that quantum c... The transmission of quantum states in the anisotropic Heisenberg XXZ chain model with three-spin exchange interaction is studied. The average fidelity is used to evaluate the state transfer. It is found that quantum communication can be enhanced by the anisotropic coupling and multiple spin interaction. Such spin model can reduce the time required for the perfect state transmission where the fidelity is unity. The maximally entangled Bell states can be generated and separated from the whole quantum systems. 展开更多
关键词 quantum communication spin chain quantum entanglement
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Spin-Polarization of Ferroelectric Supperlattice with Spin-1/2 Transverse Ising Model
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作者 WANG Chun-Dong TENG Bao-Hua +1 位作者 LU Zhen-Zhen KWOK So-Ying 《Communications in Theoretical Physics》 SCIE CAS CSCD 2011年第6期1024-1028,共5页
By using the simple decoupling approximation to Fermi-type Green's function for the transverse Ising model under pseudospin theory, we systemically study the influence of different exchange interactions (transverse ... By using the simple decoupling approximation to Fermi-type Green's function for the transverse Ising model under pseudospin theory, we systemically study the influence of different exchange interactions (transverse fields) of the two distinct materials on the polarization and Curie temperature of finite alternating superlattice. Meanwhile, we analyze the effect of the whole parameters of the top surface, present their influence on the polarization of each layer (including the mean polarization of the whole ferroeleetric superlattiee) and on the Curie temperature. The results show the ratio of the exchange interactions (the transverse fields), which are of the two alternating materials have deeply impact on the polarization and Curie temperature of the supperlattice. Moreover, the top surface also has great influence on the whole ferroelectric superlattice. 展开更多
关键词 ferroelectric superlattice SPIN-POLARIZATION
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A Two-step Design Method for Shaft Work Targeting on Low-temperature Process 被引量:2
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作者 罗祎青 冯胜科 +1 位作者 孙长江 袁希钢 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2014年第6期664-668,共5页
In low-temperature processes, there are interactions between heat exchanger network(HEN) and refrigeration system. The modification on HEN of the chilling train for increasing energy recovery does not always coordinat... In low-temperature processes, there are interactions between heat exchanger network(HEN) and refrigeration system. The modification on HEN of the chilling train for increasing energy recovery does not always coordinate with the minimum shaft work consumption of the corresponding refrigeration system. In this paper, a systematic approach for optimizing low-temperature system is presented through mathematical method and exergy analysis. The possibility of "pockets", which appears as right nose section in the grand composite curve(EGCC) of the process, is first optimized. The EGCC with the pockets cutting down is designed as a separate part. A case study is used to illustrate the application of the approach for a HEN of a chilling train with propylene and ethylene refrigerant system in an ethylene production process. 展开更多
关键词 EXERGY shaft work heat exchanger network cold pocket low-temperature process optimization
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Lump Solutions of Kadomtsev-Petviashvili I Equation in Non-uniform Media 被引量:1
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作者 朱晓明 张大军 陈登远 《Communications in Theoretical Physics》 SCIE CAS CSCD 2011年第1期13-19,共7页
N-lump solutions of the Kadomtsev-Petviashvili I equation in non-uniform media are derived through the inverse scattering transform. The obtained solutions describe lump waves with time-dependent amplitudes and veloci... N-lump solutions of the Kadomtsev-Petviashvili I equation in non-uniform media are derived through the inverse scattering transform. The obtained solutions describe lump waves with time-dependent amplitudes and velocities. Dynamics of l-lump wave and interactions of two lump wave are illustrated. 展开更多
关键词 non-isospectral Kadomtsev-Petviashvili I equation inverse scattering transform lump solutions
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Single‐atom catalysts on metal‐based supports for solar photoreduction catalysis 被引量:5
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作者 Huayang Zhang Wenjie Tian +4 位作者 Xiaoguang Duan Hongqi Sun Yingping Huang Yanfen Fang Shaobin Wang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2022年第9期2301-2315,共15页
Metal atoms atomically dispersed on an inorganic metal‐based support compose a unique category of single atom catalysts(SACs)and have important applications in catalytic photoreduction reactions,including H_(2) evolu... Metal atoms atomically dispersed on an inorganic metal‐based support compose a unique category of single atom catalysts(SACs)and have important applications in catalytic photoreduction reactions,including H_(2) evolution reaction,CO_(2) reduction reaction,and N_(2) reduction reaction.In this minreview,we summarized the typical metal‐support interaction(M‐SI)patterns for successful anchoring of single‐atom metals on metallic compound supports.Subsequently,the contribution of the dispersed single metal atoms and M‐SI to photocatalytic reactions with improved activity,selectivity,and stability are highlighted,such as by accelerating charge transfer,regulating band structure of the support,acting as the reductive sites,and/or increasing catalytic selectivity.Finally,some challenges and perspectives of future development are proposed.We anticipate that this minireview will be a beneficial supplement for a comprehensive perception of metal‐based material supported SACs and their application in heterogeneous photo‐reductive catalysis. 展开更多
关键词 Single atom catalyst Metal‐based support Metal‐support interaction PHOTOCATALYSIS Solar energy conversion
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Investigation on Magnetic Properties of Exchange Coupled Transition Metal Complexes──I. Application of the Kambe's Theory
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作者 谢秀兰 Augstin,Lo 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 1995年第2期145-150,共6页
Magnetic susceptibility of a series of dinuclear Ⅴ(Ⅳ) . Co(Ⅱ) and Mn(Ⅲ) complexes has been measured in the temperature range of 1. 5 ~300K. The isotropic Heisenberg theory has been applied to study the temperatur... Magnetic susceptibility of a series of dinuclear Ⅴ(Ⅳ) . Co(Ⅱ) and Mn(Ⅲ) complexes has been measured in the temperature range of 1. 5 ~300K. The isotropic Heisenberg theory has been applied to study the temperature-dependent behaviour of the magnetic susceptibility of these complexes and a corresponding program for fitting the experimental results has been set up on a VAX 11/785 computer. Conclusions can be drawn that the three complexes studied are all anti-ferromagnetically coupled with coupling constants -4. 4 , -115. 2 , and - 8. 4 cm ̄(-1) for Ⅴ(Ⅳ) . Co(Ⅱ) ,and Mn(Ⅲ) complexes, respectively. 展开更多
关键词 magnetic susceptibility magnetic exchange interaction anti-ferromagnetic coupling isotropic Heisenberg model theoretical fitting
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Monte Carlo Study of Planar Rotator Model with Weak Dzyaloshinsky-Moriya Interaction
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作者 SUN Yun-Zhou LIU Hui-Ping YI Lin 《Communications in Theoretical Physics》 SCIE CAS CSCD 2006年第4X期663-667,共5页
With the help of an improvement Monte Carlo method, the Berezinskii-Kosterlitz-Thouless phase transition arising in two-dimensional planar rotator model with weak Dzyaloshinsky-Moriya (DM) interaction is investigate... With the help of an improvement Monte Carlo method, the Berezinskii-Kosterlitz-Thouless phase transition arising in two-dimensional planar rotator model with weak Dzyaloshinsky-Moriya (DM) interaction is investigated. The effects of the DM interaction on specific heat, susceptibility, and magnetization are simulated. The critical temperature of transitions is determined by the so-called Binder cumulant and the susceptibility of finite-size scaling. We find that the chiral Z2 symmetry reduced by the DM interactions plays an important role in a two-dimensional XY spin system, typically, the critical temperature is sensitive to weak DM spin couplings. 展开更多
关键词 Monte Carlo method Berezinskii-Kosterlitz-Thouless phase transition Dzyaloshinsky-Moriya interaction XY model
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Controlled release and enhanced antibacterial activity of salicylic acid by hydrogen bonding with chitosan 被引量:2
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作者 Zujin Yang Yanxiong Fang HongbingJi 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2016年第3期421-426,共6页
Microcapsules of salicylic acid (SA) with chitosan were prepared by spray drying method. Various analytical methods were used to characterize the nature of microcapsules. Fourier-transform infrared spectroscopy (F... Microcapsules of salicylic acid (SA) with chitosan were prepared by spray drying method. Various analytical methods were used to characterize the nature of microcapsules. Fourier-transform infrared spectroscopy (FTIR) confirmed the presence of intermolecular interactions between chitosan and SA. Particle size analysis showed that the average size ofmicrocapsules ranged from 2 to 20 pro, Scanning electron microscopy (SEM) studies indicated that the microspheres were spherical and had a relatively smooth surface. Microbiological assay of antibacterial activity for SA and its microcapsules was measured using different bacterial strains. It was found that the antibacterial activity of SA was improved after the formation of microcapsules. The in vitro release profile showed that the microcapsules could control SA release from I h to 4 h. Kinetic studies revealed that the release pattern follows Korsmeyer-Peppas mechanism. Enhanced antibacterial activity of the SA micro- capsules was attributed to the synergistic effects of intermolecular hydrogen-bonding interactions N-H...O and O-H...O=C between SA and chitosan. It was also confirmed by quantum chemical calculation. 展开更多
关键词 Salicylic acid MICROCAPSULE Release performance Antibacterial activity Quantum-chemical calculations
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Transferring Multi-Dimensional Quantum States and Preparing Quantum Networks in Cavity QED
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作者 陈子翃 郑小兰 廖长庚 《Communications in Theoretical Physics》 SCIE CAS CSCD 2010年第9期452-456,共5页
In this paper we propose a scheme for transferring quantum states and preparing quantum networks. Compared with the previous schemes, this scheme is more efficient, since three or four-dimensional quantum states can b... In this paper we propose a scheme for transferring quantum states and preparing quantum networks. Compared with the previous schemes, this scheme is more efficient, since three or four-dimensional quantum states can be transferred with a single step and information interchange of three-dimensional quantum states can be realized, which is a significant improvement. It is based on the resonant interaction of a three-mode cavity field with an atom. As a consequence, the interaction time is shortened greatly. Furthermore, we give some discussions about the feasibility of the scheme. 展开更多
关键词 multi-dimensional quantum states transfer quantum networks cavity QED
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Properties of strangelets in a new quark mass confinement model with one-gluon-exchange interaction 被引量:2
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作者 XIA ChengJun CHEN ShiWu PENG GuangXiong 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2014年第7期1304-1310,共7页
The properties of strangelets at zero temperature with a new quark model that includes both the confinement and one-gluonexchange interactions is studied in a fully self-consistent method.The charge and parameter depe... The properties of strangelets at zero temperature with a new quark model that includes both the confinement and one-gluonexchange interactions is studied in a fully self-consistent method.The charge and parameter dependence of the stability of strangelets are discussed.It is found that the one-gluon-exchange interaction lowers the energy of a strangelet,and consequently allows the strangelet to be absolutely stable.The stable strangelet radius in the present model is smaller in comparison with the absence of one-gluon-exchange interaction,and can thus be much less than that of a normal nucleus with the same baryon number,according to the strength of the confinement and one-gluon-exchange interactions. 展开更多
关键词 strangelets quark confinement model one-gluon-exchange effect
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Luminescence properties of Eu^(2+) doped BaAl_2Si_2O_8 phosphor for white LEDs 被引量:1
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作者 MA MingXing ZHU DaChuan +2 位作者 ZHAO Cong HAN Tao TU MingJing 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2011年第10期1783-1786,共4页
The BaAl2Si2O8:Eu2+blue emitting phosphor was obtained through the one-step calcination process of precursors prepared bychemical co-precipitation method. The phase structure and luminescence propertied of the phospho... The BaAl2Si2O8:Eu2+blue emitting phosphor was obtained through the one-step calcination process of precursors prepared bychemical co-precipitation method. The phase structure and luminescence propertied of the phosphor were investigated usingX-ray diffraction (XRD) and a fluorescence spectrophotometer. The excitation spectrum exhibited a broad band between 230nm and 400 nm and the emission peaking at about 470 nm was observed, which originated from the allowed f-d transition ofEu2+ions at Ba2+sites. Owing to the different optimal concentrations under different excitation wavelengths (254 nm and 365nm), the energy-transfer mechanism in this phosphor has changed from the dipole-dipole interaction to the exchange interac-tion of Eu2+ions. 展开更多
关键词 PHOSPHOR BaAl2Si2O8:Eu2+ luminescence properties white LED
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A series of 3d-4f heterometallic frameworks comprising 2D lanthanide-organic layers and diverse Cu-complex pillars 被引量:3
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作者 XU Jing ZHENG ShouTian YANG GuoYu 《Science China Chemistry》 SCIE EI CAS 2011年第9期1407-1417,共11页
Six novel 3D layer-pillared lanthanide-transition metal coordination polymers,LnCuX(IN)2(Ac)(H2O)(Ln = Tb,X = Br(1);Ln = Er,X = Cl(2)),[LnCuCl(IN)2(Ac)].H2O(Ln = Gd(3);Ln = Eu(4)),and [LnCu2Br2(IN)2(Ac)(H2O)].nH2O(Ln ... Six novel 3D layer-pillared lanthanide-transition metal coordination polymers,LnCuX(IN)2(Ac)(H2O)(Ln = Tb,X = Br(1);Ln = Er,X = Cl(2)),[LnCuCl(IN)2(Ac)].H2O(Ln = Gd(3);Ln = Eu(4)),and [LnCu2Br2(IN)2(Ac)(H2O)].nH2O(Ln = Dy,n =0(5);Ln = Gd,n = 0.5(6))(IN = isonicotinate,Ac = acetate),have been obtained by linking Ln-organic layers and diverse Cu-complex pillars under hydrothermal conditions.1 and 2 are isostructural and formed by 2D Ln-IN-Ac layers and CuX(IN)2 pillars(X = Br(1),X= Cl(2));3 and 4 are isomorphic and comprised of 2D Ln-IN-Ac layers and dimeric Cu2Cl(IN)4 pillars;while 5 and 6 are isostructural and built from 2D Ln-IN-Ac layers and tetrameric Cu4Br4(IN)4 pillars.The magnetic susceptibility investigation of 3 and 6 shows the presence of weak antiferromagnetic exchange interactions between the Ln3+ ions.Compounds 1-6 represent good examples of using 2D Ln-organic layers and diverse Cu-complex pillars as building units to construct intriguing 3D Ln-TM-organic frameworks. 展开更多
关键词 3d-4f heterometallic frameworks LIGANDS hydrothermal syntheses
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Electronic physics and possible superconductivity in layered orthorhombic cobalt oxychalcogenides 被引量:1
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作者 Congcong Le Shengshan Qin Jiangping Hu 《Science Bulletin》 SCIE EI CAS CSCD 2017年第8期563-571,共9页
We suggest that cobalt-oxychalcogenide layers constructed by vertex sharing CoA_2O_2(A = S, Se, Te) tetrahedra, such as BaCoAO, are strongly correlated multi-orbitals electron systems that can provide important clues ... We suggest that cobalt-oxychalcogenide layers constructed by vertex sharing CoA_2O_2(A = S, Se, Te) tetrahedra, such as BaCoAO, are strongly correlated multi-orbitals electron systems that can provide important clues on the cause of unconventional superconductivity. Differing from cuprates and iron-based superconductors, these systems lack of the D_(4h) symmetry classification. However, their parental compounds possess antiferromagnetic(AFM) Mott insulating states through pure superexchange interactions and the low energy physics near Fermi surfaces upon doping is mainly attributed to the three t_(2g) orbitals that dominate the AFM interactions. We derive a low energy effective model for these systems and predict that a d-wave-like superconducting state with reasonable high transition temperature can emerge by suppressing the AFM ordering even if the pairing symmetry can not be classified by the rotational symmetry any more. 展开更多
关键词 SUPERCONDUCTIVITY Transition metal bichalcogenides High temperature superconductors Anti ferromagnetism
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Transformation optics applied to van der Waals interactions 被引量:4
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作者 Rongkuo Zhao Yu Luo J.B.Pendry 《Science Bulletin》 SCIE EI CAS CSCD 2016年第1期59-67,共9页
The van der Waals force originates from the electromagnetic interaction between quantum fluctuationinduced charges. It is a ubiquitous but subtle force which plays an important role and has a wide range of application... The van der Waals force originates from the electromagnetic interaction between quantum fluctuationinduced charges. It is a ubiquitous but subtle force which plays an important role and has a wide range of applications in surface related phenomena like adhesion, friction,and colloidal stability. Calculating the van der Waals force between closely spaced metallic nanoparticles is very challenging due to the strong concentration of electromagnetic fields at the nanometric gap. Especially, at such a small length scale, the macroscopic description of the dielectric properties no longer suffices. The diffuse nonlocal nature of the induced surface electrons which are smeared out near the boundary has to be considered. Here,we review the recent progress on using three-dimensional transformation optics to study the van der Waals forces between closely spaced nanostructures. Through mapping a seemingly asymmetric system to a more symmetric counterpart, transformation optics enables us to look into the behavior of van der Waals forces at extreme length scales,where the effect of nonlocality is found to dramatically weaken the van der Waals interactions. 展开更多
关键词 van der Waals forces Transformationoptics NONLOCALITY PLASMONICS
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Darboux Transformations and N-soliton Solutions of Two (2+1)-Dimensional Nonlinear Equations 被引量:2
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作者 王鑫 陈勇 《Communications in Theoretical Physics》 SCIE CAS CSCD 2014年第4期423-430,共8页
Two Darboux transformations of the(2+1)-dimensional Caudrey–Dodd–Gibbon–Kotera–Sawaka(CDGKS)equation and(2+1)-dimensional modified Korteweg-de Vries(mKdV) equation are constructed through the Darboux matrix method... Two Darboux transformations of the(2+1)-dimensional Caudrey–Dodd–Gibbon–Kotera–Sawaka(CDGKS)equation and(2+1)-dimensional modified Korteweg-de Vries(mKdV) equation are constructed through the Darboux matrix method, respectively. N-soliton solutions of these two equations are presented by applying the Darboux transformations N times. The right-going bright single-soliton solution and interactions of two and three-soliton overtaking collisions of the(2+1)-dimensional CDGKS equation are studied. By choosing different seed solutions, the right-going bright and left-going dark single-soliton solutions, the interactions of two and three-soliton overtaking collisions, and kink soliton solutions of the(2+1)-dimensional mKdV equation are investigated. The results can be used to illustrate the interactions of water waves in shallow water. 展开更多
关键词 Darboux transformation (2+1)-dimensional Caudrey-Dodd-Gibbon-Kotera-Sawaka equation (2+1)-dimensional modified Korteweg-de Vries equation N-soliton solutions
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A reversible acid-base fluorescent switch based on molecular cocrystal of 4-[2-4-quinolinyl)vinyl]phenol and tetrafluoroterephthalic acid 被引量:3
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作者 Shuzhen Li Dongpeng Yan 《Science China Chemistry》 SCIE EI CAS CSCD 2018年第2期215-221,共7页
Photoactive cocrystal materials have received growing research interest in construction of photofunctional systems owing to the crucial roles in modifying the photo-related properties of molecular solids, based on the... Photoactive cocrystal materials have received growing research interest in construction of photofunctional systems owing to the crucial roles in modifying the photo-related properties of molecular solids, based on the non-bonding interactions between self-assembly units. Herein, we report tunable luminescence and acid-base stimuli-responsive properties of a cocrystal assembled by 4-[2-(4-quinolinyl)vinyl]phenol (qv) and tetrafluoroterephthalic acid (a). The luminescent properties (such as wavelength, quantum yield and fluorescence lifetime) of qv.a changed obviously relative to the pristine qv, due to the proton transfer and the alternation of molecular arrangement within two-component crystalline material. The photoemission intensity of qv.a underwent from weak to strong upon HCl gas fuming, and the corresponding wavelength changed from 517 nm to 597 nm, which can be reversibly transferred after exposed in NH3. Such luminescent switching behavior may provide an effective way to develop new types of photoactive stimuli-responsive materials and optical sensors. 展开更多
关键词 photoactive cocrystal tunable luminescence stimuli-responsive properties luminescent switching
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