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Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 2947-2959页

作者： fujian yang Jing Luo Guiling Wang Hejuan Liu Dawei Hu Hui Zhou State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese academy of sciences Beijing100049China Sinopec Star Hubei New Energy Development Co. Ltd.Wuhan430010China institute of Hydrogeology and Environmental Geology Chinese Academy of Geological SciencesShijiazhuang050061China

In unconsolidated sandstone reservoirs,presence of numerous movable grains and a complex grain size composition necessitates a clear understanding of the physical clogging process for effective groundwater recharge in groundwater-source heat pump *** investigate this,a series of seepage experiments was conducted under in situ stress conditions using unconsolidated sandstone samples with varying grain *** clogging phenomenon arises from the combined effects of grain migration and compaction,wherein the migration of both original and secondary crushed fine-grain particles blocks the seepage ***,grain composition influences the migration and transport properties of the *** samples composed of smaller grains,the apparent permeability demonstrates a transition from stability to *** contrast,samples with larger grains experience a skip at the stability stage and directly enter the decrease stage,with a minor exception of a slight increase ***,a unique failure mode characterized by diameter shrinkage in the upper part of the sample is observed due to the combined effects of grain migration and in situ stress-induced *** testing results contribute to a better understanding of the clogging mechanism caused by the coupled effects of grain migration and compaction during groundwater recharge in unconsolidated sandstone reservoirs used in groundwater-source heat pump systems.

关键词： Groundwater-source heat pump Clogging Grain migration Compaction effect Groundwater recharge Unconsolidated sandstone

Damage characteristics of fused silica under low-temporal coherence light

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High Power Laser Science and Engineering 2024年第3期12卷 77-83页

作者： Chong Shan Lingbao Kong fujian Li Yong Cui Lailin Ji Quan zheng Daxing Rao Ruijing He Xiaohui Zhao Yuanan Zhao Zhan Sui Shanghai Engineering Research Center of Ultra-precision Optical Manufacturing School of Information Science and TechnologyFudan UniversityShanghaiChina Shanghai institute of Laser Plasma China Academy of Engineering PhysicsShanghaiChina Key Laboratory of High Power Laser Materials Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghaiChina

The damage characteristics of fused silica were investigated under low-temporal coherence light(LTCL).It was found that the laser-induced damage threshold(LIDT)of fused silica for the LTCL was lower than that of the single longitudinal mode pulse laser,and for the LTCLs,the LIDTs decrease with the increasing of laser bandwidth,which is not consistent with the temporal spike *** is due to the nonlinear self-focusing effect and multi-pulse accumulation *** specific reasons were analyzed based on theoretical simulation and experimental *** research work is helpful and of great significance for the construction of high-power LTCL devices.

关键词： laser-induced damage threshold low-temporal coherence light nonlinear self-focusing effect temporal spike

Radiation-Assisted Synthesis of Crown Ether-Modified Covalent Organic Frameworks for Lithium Isotope Separation

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CCS Chemistry 2024年第10期6卷 2594-2606页

作者： Shouchao Zhong Yue Wang Jianhui Lan Mingshu Xie Yiqian Wu Jiuqiang Li fujian Liu Lilong Jiang Jing Peng Liyong Yuan Maolin Zhai Weiqun Shi Radiochemistry and Radiation Chemistry Key Laboratory of fundamental Science Key Laboratory of Polymer Chemistry and Physics of the Ministry of EducationCollege of Chemistry and Molecular EngineeringBeijing National Laboratory for Molecular SciencesPeking UniversityBeijing 100871 National Engineering Research Center of Chemical Fertilizer Catalyst College of Chemical EngineeringFuzhou UniversityFuzhou350002 Fujian Laboratory of Nuclear Energy Chemistry Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049

γ-ray radiation-induced grafting strategy was first employed to immobilize 4-aminobenzo-15-crown-5 onto a covalent organic framework(COF).This endeavor culminated in the successful synthesis of a class of two-dimensional crown ether-modified COFs(named[15C5]n%-(TzDa-G-x%)),marking the maiden utilization of COFs in the realm of^(6)Li/^(7)Li isotope *** COFs exhibited swifter adsorption kinetics than alternative *** them,[15C5]_(57%)-(TzDa-G-50%)with its excellent crystallinity,porosity,and stability exhibited the best performance in Li+adsorption and^(6)Li/^(7)Li isotope *** Li+adsorption in acetonitrile achieved a capacity of 3.6 mg·g^(−1)within 30 min and a saturation capacity of 7.3 mg·g^(−1).The single-stage separation factor of^(6)Li/^(7)Li isotopes was 1.014±*** results of dynamic adsorption column experiments showed that the packed column made of[15C5]_(57%)-(TzDa-G-50%)maintained stable performance during four cycles of Li+adsorptionelution,with over 99%Li+removal rate in *** crown ether-modified COF has potential application in^(6)Li/^(7)Li isotope separation,and this radiation-assisted synthesis strategy is expected to become universal in the modification of COFs for diverse applications.

关键词： covalent organic framework gamma radiation modification crown ether ^(6)Li/^(7)Li isotope separation adsorption column

A dinuclear molybdenum cluster containing i-mnt ligand: synthesis and crystal structure of [Mo_2S_4(i-mnt)_2] (Et_4N)_2

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Chinese Journal of Chemistry 1997年第5期15卷 417-424页

作者： SUN, fu-Xia LU, Shao-Fang WU, Qiang-Jin HUANG, Xiao-YingState Key Laboratory of Structural Chemistry and fujian institute of Research on the Structure of Matter, Chinese academy of sciences, fuzhou, fujian 350002, china State Key Laboratory of Structural Chemistry and fujian institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China

A dinuclear molybdenum(V) cluster compound (Et4N)2[Mo2S4(i-mnt)2] (i-mnt=l,l-dicyanoethylene-2,2-dithiol, (S2C=C(CN)2]2-) has been prepared by the ligand substitution reaction of Mo2S4(iso-pr2dtp)2 (iso-pr2dtp=S2P(OC3H7)2-) with K2(i-mnt) in the presence of Bt4NI. This cluster was characterized by inrrared spectrum, UV-Vis spectrum and single crystal structure analy-sis. The cluster anion [Mo2S4(i-mnt)2]2- possesses C, symmetry with a crystallographic mirror plane through two bridging S atoms. By the S....S supramolecular interactions between two adjacent cluster anions the [Mo2S4(i-mnt)2]2- anions are linked to form infinite chains along the b axis. Crystal data: monoclinic, space group C2/m, a=1.8748(6), b=1.5360(4), c=1.4322(5) nm, ,β=112.02(2)°, V=3.823(4) nm3, Z=4, Dc=1.50 g/cm3. The final R=0.038 and .RW=0.053 for 3015 observed unique reflections.

关键词： Dinuclear molybdenum cluster synthesis crystal structure IR and UV-Vis spectra S....S supramolecular interaction

Understanding the defect chemistry of oxide nanoparticles for creating new functionalities:A critical review

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Science china Chemistry 2011年第6期54卷 876-886页

作者： LI GuangShe,LI LiPing & zheng Jing State Key Laboratory of Structural Chemistry fujian institute of Research on the Structure of Matter,Chinese academy of sciences,fuzhou 350002,china State Key Laboratory of Structural Chemistry fujian institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou China

This work presents a critical review on the studies of defect chemistry of oxide nanoparticles for creating new functionalities pertinent to energy applications including dilute-magnetic semiconductors,giant-dielectrics,or white light *** is placed on the relationships between the internal structure and defective surfaces of oxide nanoparticles and their synergy in tailoring the materials *** review is arranged in a sequence:(1) structural fundamentals of bulk oxides,using TiO2 as a model simple oxide to highlight the importance of polymorphs in tuning the electronic structures;(2) structural features of simple oxide nanoparticles distinct from the bulk,which show that nanoparticles can be considered as a special solid under the compression as originated from the surface defect dipole-dipole interactions;and(3) new functions achieved through extending the defect chemistry concept to the assembled architectures or multi-component oxide nanoparticles,in which defect surfaces enable the localized electrons or intermediate levels to produce giant dielectric performance or tunable light *** is concluded that understandings of defect chemistry provide diverse possibilities to manipulate electrons in oxide nanoparticles for functionalities in energy-relevant applications.

关键词： nanoparticles defect chemistry surfaces functionalities

Structures and properties of functional metal iodates

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Science china Chemistry 2011年第6期54卷 911-922页

作者： SUN Chuanfu, yang BingPing & MAO JiangGao State Key Laboratory of Structural Chemistry fujian institute of Research on the Structure of Matter, Chinese academy of sciences, fuzhou 350002, china State Key Laboratory of Structural Chemistry fujian institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou China

Metal iodates with a lone-pair containing I(V) that is in an asymmetric coordination geometry can form a diversity of unusual structures and many of them are promising new second homonic generation (SHG) materials. They exhibit wide transparency wavelength regions, large SHG coefficients and high optical-damage thresholds as well as moderately high thermal stability. In this paper, the structures and properties of the metal iodates are reviewed. The combination of d0 transition-metal cations with the iodate groups afforded a large number of metal iodates, with cations covering alkali metal, alkaline earth and lanthanide elements. Many of them are noncentrosymmetric (NCS) and display excellent SHG properties due to the additive effects of polarizations from both types of the asymmetric units. Some lanthanide iodates are able to emit strong luminescence in the visible or near-IR regions. The use of transition metal ions with dn (n ≠ 0) electronic configuration into iodate systems can also induce the formation of NCS compounds when the lone pairs of the iodate groups are properly aligned. The dn transition metal cations are normally octahedrally coordinated or in a square-planar coordination geometry. furthermore, the combination of two different types of lone-pair-containing cations is also an effective strategy to design new SHG materials.

关键词： second homonic generation (SHG) metal iodates crystal structures structure-property relationship

Nonlinear Optical BBO Crystals: Growth, Properties and Applications

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Chinese Journal of Structural Chemistry 2000年第2期19卷 112-121页

作者： TANG Ding Yuan (fujian institute of Research on the Structure of Matter, the Chinese academy of sciences, fuzhou 350002) 中科院福建物质结构所福建福州 3 50 0 0 2

Low temperature phase barium metaborate β BaB 2O 4(BBO) is an important nonlinear optical material. Up to now, the BBO single crystals with large size and good optical quality were grown from Na 2O or NaF fluxed solvents by the top seeded solution growth (TSSG) technique with or without pulling. In order to improve the growth rate and quality of BBO crystals, several new techniques such as continuous feeding, forced stirring and cooling growing crystals etc. have been suggested. Applications of BBO as an excellent nonlinear optical crystal include mainly frequency conversion of various laser radiation, high average power frequency conversion, frequency doubling of ultrashort pulses and broadly tunable optical parametric oscillators (OPO). This paper is a brief review on the growth, properties and applications of BBO crystals.

关键词： nonlinear optical material barium metaborate crystal growth crystal property

Approaching the theoretical capacity of TiO_(2) anode in a photorechargeable lithium-ion battery

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Nano Research 2024年第4期17卷 2655-2662页

作者： Wen Yan Jie Wang Qing Hu Jingjing fu Mohamed K.Albolkany Tian Zhang Xiao Lu Fei ye Bo Liu School of Chemistry and Materials Science University of Science and Technology of ChinaHefei 230026China

New generation of lithium-ion batteries(LIBs)integrating solar energy conversion and storage is emerging,as they could solve the fluctuation problem in the utilization of solar ***-rechargeable lithium-ion batteries(PR-LIBs)are ideal devices for such target,in which solar energy is converted into electricity and stored in *** order to achieve the high performance of PR-LIB,it is crucial to develop dual-function electrode materials that can synergistically capture solar energy and store ***,we present photo-rechargeable lithium-ion batteries using defective black TiO_(2) as photoanode prepared by lithium *** photoanode exhibits excellent photo response in full solar spectrum with a capacity enhancement of 46.4%under illumination,corresponding to the energy conversion efficiency of 4.4%at the current density of 1 A·g^(-1).When illumination is applied at 20 mA·g^(-1),the battery capacity increases from~230 in dark to~349 mAh·g^(-1) at the first cycle,and then stabilizes at 310 mAh·g^(-1),approaching the theoretical value of 335 mAh·g^(-1) of TiO_(2) electrode *** finding provides thoughts for breaking the capacity limitations in TiO_(2) and paves the way for powering LIBs by solar illumination.

关键词： photo-rechargeable lithium-ion batteries photoanode defective TiO_(2)(D-TiO_(2))

Synthesis and Structure of a Dimolybdenum Carbonyl Compound with Thiolato Bridges 〔Et4N〕2〔Mo2（CO）8（SC6H4-Cl-p）2〕

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Chinese Journal of Structural Chemistry 2000年第1期19卷 27-30页

作者： PAN Guo\|Hua\ ZHUABG Bo\|Tao *\ HUANG Liang\|Ren(State Key Laboratory of Structural Chemistry fujian institute of Research on the Structure of Matter, the Chinese academy of sciences, fuzhou, fujian 350002, china) 中科院福建物质结构所结构化学国家重点实验室福建福州 350 0 0 2

Reaction of Mo(CO) 6 with p Cl C 6H 4SNa and Et 4NCl·H 2O in CH 3CN afforded a dinuclear molybdenum(0) compound 〔Et 4N〕 2〔Mo 2(CO) 8(SC 6H 4 Cl p ) 2〕 (1). The crystal structure was determined by X ray diffraction. The crystallographic data: C 36 H 48 Cl 2Mo 2N 2O 8S 2, M r = 963.71, monoclinic, P2 1/c, a=9.269(4), b=13.750(3), c=17.466(6) ;β=104.84(3)°; V=2151.8(3)  3; Z=2; D c =1\^49 g/cm 3; F(000)=984; μ=8.3 cm -1 ; Mo Kα radiation ( λ =0.71073); Final R =0.055 and R w =0.065 for 3287 reflections with I>3.0σ(I ). The X ray structure analysis revealed that the Mo 2S 2 core is planar. The geometry around each Mo atom is a distorted octahedron, both of which form an edge sharing bioctahedron. The Mo…Mo distance is 4.014(2) , and this obviously indicates the absence of Mo-Mo bond.

关键词： synthesis structure Mo 2S 2 unit Mo-SR compound