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Synergistic injection of the thermosensitive hydrogel and Bi-based alloy bone cement for orthopaedic repair

science china(Technological sciences) 2024年第7期67卷 2153-2163页

作者： liu SiCong LI Lei jiang ChanYuan WANG QianYu DENG ZhongShan Key Laboratory of Cryogenic science and Technology Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Department of Cleft Lip and Palate Plastic Surgery HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100144China School of Future Technology University of Chinese Academy of SciencesBeijing 100049China

Low-melting-point alloys have the advantages of good biocompatibility, plasticity, and near-bone mechanical strength, making them suitable as bone defect-filling materials for direct injection into defective bone sites. However, using low-melting-point alloys for orthopedic implants poses the challenge of causing thermal damage to the surrounding bone tissue during injection. In this study, a thermosensitive hydrogel is prepared and synergistically injected into the bone defect site with BiInSn. BiInSn solidifies and releases heat during injection, while the thermosensitive hydrogel absorbs heat and transforms into a gel state,encapsulating BiInSn. Therefore, the surrounding bone tissue is effectively protected from thermal damage. When BiInSn and the thermosensitive hydrogel were injected synergistically, in vitro thermal experiments revealed that the maximum temperature of the surrounding bone tissue reached 42℃. This temperature is below the 47℃ threshold, which causes permanent damage to bone tissues. In vivo experiments demonstrated that rats in the BiInSn-thermosensitive hydrogel group exhibited better recovery at the bone defect sites. These results suggest that the synergistic injection of Bi-based alloy and thermosensitive hydrogel is beneficial in reducing thermal damage to bone tissue, guiding bone tissue growth, and effectively facilitating the repair of bone defects.

关键词： bone defects thermosensitive hydrogel thermal damage to tissue bismuth-based alloy bone cement

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Large Eddy Simulation of NO Formation in Non-Premixed Turbulent Jet Flames with Flamelet/Progress Variable Approach

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Journal of Thermal science 2024年第06期33卷 2399-2412页

作者： WAN Jiawei GUO Junjun WEI Zhengyun jiang Xudong liu Zhaohui State Key Laboratory of Coal Combustion School of Energy and Power EngineeringHuazhong University of Science and Technology (HUST) CCRC King Abdullah University of Science and Technology (KAUST)

To improve the NO modelling in turbulent flames,the flamelet/progress variable(FPV) model is extended by introducing NO mass fraction into the progress variable and incorporating an additional NO transport *** sets of flamelet databases are tabulated with progress variables based on major species and NO mass fraction,*** former is used for the acquisition of the main thermochemical variables,while the latter is employed for NO ***,an additional transport equation is solved to obtain the NO mass fraction,with the source term corrected using the scale similarity *** assessments are first conducted on laminar counterflow diffusion flames to identify lookup-related errors and assess the suitability of progress variable *** results show that the progress variables based on major species and NO could correctly describe the main thermochemical quantities and NO-related variables,***,the model is applied to the large eddy simulation(LES) of Sandia *** results indicate that the extended FPV model improves the NO prediction,with a mean error for NO prediction at 55%,significantly lower than those of existing FPV models(13.% and 3.5%).The LES with the extended FPV model quantitatively captures NO suppression in the mid-range of Reynolds numbers from 22 400(Flame D) to 3. 600(Flame E),but underestimates the NO suppression at higher Reynolds numbers from 3. 600 to 44 800(Flame F).This underprediction is primarily attributed to the underestimation of local extinction levels in flames with high Reynolds numbers.

关键词： flamelet/progress variable model large eddy simulation NO emission Sandia flames

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(Parallel) kinetic resolution of 3.3.disubstituted indolines via organocatalyzed reactions with azodicarboxylates

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science china Chemistry 2024年第3期67卷 973-980页

作者： Qianwen jiang Dekun Zhang Mengyao Tang Hua liu Xiaoyu Yang School of Physical science and Technology ShanghaiTech UniversityShanghai 201210China

A novel kinetic resolution(KR) method has been developed for 3.3.disubstituted indolines, whose catalytic asymmetric synthesis remains a significant challenge in organic synthesis. The key to the success of this KR protocol lies in the utilization of chiral phosphoric acid-catalyzed triazane formation reaction with azodicarboxylates, which enables the enantioselective synthesis of various substituted indolines bearing C3.quaternary stereocenters with good to high enantioselectivities(with sfactors up to 70). Moreover, an intriguing parallel kinetic resolution(PKR) has been developed by combining triazane formation and dehydrogenation reactions using different azodicarboxylates. Experimental studies have provided insight into the mechanism of this PKR reaction, demonstrating stereoselectivity in both triazane formation and dehydrogenation steps, favoring the opposite enantiomers. The large-scale synthesis and diverse derivatizations of the products, particularly the imine groupcontaining 3.-indoles, demonstrate the value of these(P)KR methods.

关键词： asymmetric organocatalysis kinetic resolution 3 3.disubstituted indolines azodicarboxylate triazanes

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The corrosion characteristic and mechanism of Mg-5Y-1.5Nd-xZn-0.5Zr(x=0,2,4,6 wt.%)alloys in marine atmospheric environment

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Journal of Magnesium and Alloys 2024年第1期12卷 139-158页

作者： Quantong jiang Dongzhu Lu Liren Cheng Nazhen liu Baorong Hou CAS Key Laboratory of Marine Environmental Corrosion and Bio-fouling Institute of OceanologyChinese Academy of SciencesNo.7 Nanhai RoadQingdao 266071PR China State Key laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesNo.5625 Renmin StreetChangchun 130022PR China Open Studio for Marine Corrosion and Protection Pilot National Laboratory for Marine Science and Technology(Qingdao)No.1 Wenhai RoadQingdao 266071PR China Sanya institute of Oceanology South China Sea Institute of OceanologyChinese Academy of SciencesZhenzhou RoadSanya 572000PR China

The microstructure and precipitated phases of as-cast Mg-5Y-1.5Nd-x Zn-0.5Zr(x=0,2,4,6 wt.%)alloys were investigated by optical microscopy,scanning electron microscopy,energy-dispersive spectrometry and X-ray *** exposure corrosion experiment of these magnesium alloys was tested in South china Sea and KEXUE vessel atmospheric *** corrosion characteristic and mechanism of magnesium alloys of Mg-5Y-1.5Nd-x Zn-0.5Zr(x=0,2,4,6 wt.%)alloys were analyzed by weight loss rate,corrosion depth,corrosion products and corrosion *** electrochemical corrosion tests were also measured in the natural *** comprehensive results showed that Mg-5Y-1.5Nd-4Zn-0.5Zr magnesium alloy existed the best corrosion resistance whether in the marine atmospheric environment and natural seawater *** depended on the microstructure,type and distribution of precipitated phases in Mg-5Y-1.5Nd-4Zn-0.5Zr magnesium *** quantity anodic precipitated phases in the microstructure of Mg-5Y-1.5Nd-4Zn-0.5Zr alloy played the key role in the corrosion resistance.

关键词： Marine atmospheric environment Exposure corrosion Magnesium alloy Corrosion rate Corrosion mechanism

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Oxidative Dehydrogenation of Propane over Supported Nickel Single-Atom Catalyst

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chinese Journal of Chemistry 2024年第4期42卷 370-376页

作者： Qian Zhang Xunzhu jiang Yangyang Li Yuanlong Tan Qike jiang Xiaoyan liu Botao Qiao CAS Key Laboratory of science and Technology on Applied Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalianLiaoning116023 China University of chinese academy of sciences Beijing100049 China Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalianLiaoning116023 China

Oxidative dehydrogenation of propane has been an ever-growing field for propylene production due to its exothermic properties,of which overoxidation is the major drawback,with CO and even CO_(2) as undesired *** the purpose of getting higher propylene selectivity as well as yield,herein,we report Ni single atoms supported on calcium aluminate as an efficient catalyst candidate for propane oxidative *** from higher valence states of Ni1 species,it shows 2—3.times as much propylene selectivity as that of Ni *** 14.2%C_(3.H_(6) yield with 47.3.propylene selectivity has been achieved on Ni single atom catalyst and a good stability during 20 h test can be obtained as well.

关键词： Oxidative dehydrogenation/Nickel Single-atom catalysts Propane Propylene selectivity

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Neosophoflavonoids A–C, A class of highly oxidized hybrid flavonoids from Sophora flavescens with antidiabetic effects

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chinese Chemical Letters 2024年第10期35卷 295-298页

作者： Xu Zhang jiang Li Kai-Zhou Lu Ya-Nan Yang Jian-shuang jiang Xiang Yuan Zi-Ming Feng Fei Ye Pei-Cheng Zhang State Key Laboratory of Bioactive Substance and Function of Natural Medicines Institute of Materia MedicaChinese Academy of Medical Sciences and PekingUnionMedical CollegeBeijing100050China

Three highly oxidized hybrid flavonoids neosophoflavonoids A–C(1,2a,and 2b)were isolated from the roots of Sophora *** A possesses a unique highly oxidized heptacyclic6/6/6/6/6/6/5 *** B and C are isomers and share the same highly oxidized hexacyclic 6/6/6/6/6/6 *** planar structures were elucidated from 1D/2D nuclear magnetic resonance(NMR),ultraviolet spectroscopy(UV),infrared spectroscopy(IR),and high resolution electrospray ionization mass spectroscopy(HRESIMS)*** absolute configurations were determined by thorough GIAO13. NMR(DP4+)calculation protocol and electronic circular dichroism(ECD)calculation *** plausible biosynthetic routes for the compounds were also *** compounds exhibited significant protein tyrosine phosphatase-1B(PTP1B)inhibitory activity with half maximal inhibitory concentration(IC_(5)0)values 3.94±0.01,0.3.±0.13.and 0.70±0.01μmol/L,*** addition,compared to a positive control fenofibrate(Feno)at 20μmol/L,compounds 2a and 2b exhibited stronger inhibitory effects on lipid accumulation in the oleic acid(OA)-induced cell model at 5 and 10μmol/L.

关键词： Sophora flavescens Highly oxidized hybrid flavonoids Neosophoflavonoids A-C PTP1B inhibition Lipid accumulation inhibition

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Ambient electrocatalytic synthesis of urea by co-reduction of NO_(3.^(-) and CO_(2) over graphene-supported In_(2)O_(3.

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chinese Chemical Letters 2024年第3期35卷 538-543页

作者： Yini Mao Yong jiang Hao liu Yimin jiang Ming Li Wei Su Rongxing He Key Laboratory of Luminescence Analysis and Molecular Sensing(Southwest University) Ministry of EducationCollege of Chemistry and Chemical EngineeringSouthwest UniversityChongqing 400715China Key Laboratory of Beibu Gulf Environment Change and Resources Utilization(Nanning Normal University) Ministry of EducationCollege of Chemistry and Life ScienceNanning Normal UniversityNanning 530000China

Urea plays a vital role in the sustainable development of mankind as it is one of the most important nitrogen *** synthesis of urea is accompanied by a high level of energy consumption while electrocatalytic methods suffer from low yields and poor *** work achieves efficient synthesis of urea by designing the graphene-In_(2)O_(3.electrocatalysts for the co-activated reduction of nitrate and carbon dioxide,where the formation rate of urea,Faraday efficiency(FE)and carbon selectivity at-0.3. V *** can reach 3.7.47μg mg^(-1)h^(-1),10.46%and~100%,***,the key intermediates in the C–N coupling reaction are demonstrated to be*NH_(2)and*CO_(2),which is of novelty compared to previous *** work may provide inspiration for subsequent studies on the reaction mechanism of the electrochemical synthesis of urea,as well as theoretical guidance for the sustainable synthesis of some other important chemical substances.

关键词： Graphene-supported In_(2)O_(3. Dispersion effect Efficient C-N coupling Key intermediate Urea

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Facile identification of fluorosurfactant category in aqueous film-forming foam concentrates via optimized^(19)F NMR

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Magnetic Resonance Letters 2024年第3期4卷 42-51页

作者： Peiyao Chen shuang Zhuang Weiguang Chen Zhijian Chen Rongzhen Li Fangyu Chen Tingting jiang Xiaobin Fu Tianjin Fire Research institute of MEM Tianjin300381China Department of Chemistry School of ScienceTianjin UniversityTianjin300354China Department of Chemistry School of ScienceTianjin Chengjian UniversityTianjin300384China Department of Molten Salt Chemistry and Engineering Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai201800China

Aqueous film-forming foams(AFFFs)are the primary source of toxic perfluoroalkyl and polyfluoroalkyl substances(PFAS)in ***,it is urgent to develop a facile and fast method for identifying fluorosurfactants in commercially available *** this work,fluorine nuclear magnetic resonance(^(19)F NMR)spectroscopy was optimized to measure AFFFs directly with the extra addition of 5%D_(2)O as the locking reagent,and high-quality spectra could be acquired within 4 min(0.1%fluorosurfactant content).Recovery experiments demonstrated that the use of different AFFFs had no marked influence on the quantitative analysis of *** method works with low-field NMR spectroscopy(1.4 T)as ***-dimensional(2D)^(19)F COSY NMR was used to make signal assignments for different fluorosurfactant *** optimized ^(19)F NMR could quantify the commercially available fluorosurfactants in different AFFFs,identify them being in either the perfluorooctane sulfonate(PFOS)or fluorotelomer sulfonic acid(FTS)categories,and distinguish the head-group of PFOS and FTS derivatives,which exhibits great potentials in the developments of relevant commercial detections.

关键词： Aqueous film-forming foams Fluorosurfactants 19F NMR Perfluorooctane sulfonate

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Non-contact gaseous microplasma electrode as anode for electrodeposition of metal and metal alloy in molten salt

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chinese Chemical Letters 2024年第4期35卷 166-169页

作者： Junhan Luo Qi Qing Liqin Huang Zhe Wang shuang liu Jing Chen Yuexiang Lu institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China The MOE Key Laboratory of Resources and Environmental System Optimization College of Environmental Science and EngineeringNorth China Electric Power UniversityBeijing 102206China Nuclear Research institute for Future Technology and Policy Seoul National UniversitySeoul 08826Republic of Korea

Microplasma based on glow discharge could act as a non-contact gaseous electrode and has attracted much attention in both fundamental research and application. Herein, with microplasma as the anode,the electrodeposition process of a series of metal and metal alloys in molten salt has been systemically studied. Four metal cations with different valence states, silver(Ag~+), nickel(Ni^(2+)), copper(Cu^(2+)), and iron(Fe^(3.)), could all be reduced on the solid cathode with high current efficiency and the corresponding metal products were of high purity. The electrodeposition of aluminum-lanthanum(Al-Ln) alloy on the aluminum cathode was also successfully carried out with microplasma as the anode, and the same alloy was obtained by using the conventional anode electrode. These results indicated that microplasma anode based on non-contact direct-current(DC) glow discharge is a promising electrode to be applied in molten salt electrolysis.

关键词： Microplasma Anode Molten salt Electrodeposition Al-Ln alloy

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Strength and ductility optimization of HPDC AlSi8MgCuZn2 alloys by modifying pre-aging treatment

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china Foundry 2024年第4期21卷 343-351页

作者： Yuan-hang jiang Hui-ting Zheng Fei liu Hai-dong Zhao National Engineering Research Center of Near-net Shape Forming for Metallic Materials South China University of TechnologyGuangzhou 510641China

Considering the components produced by high pressure die casting(HPDC)process usually with ultra-large sizes and complex morphologies,high temperature solid solution treatment is not a suitable method to further improve their mechanical *** this study,two-stage aging treatment with different pre-aging times was designed and employed to further improve the mechanical properties of HPDC Al8SiMgCuZn *** characteristics of precipitates were evaluated by a transmission electron microscope(TEM),and the precipitation strengthening mechanism was *** results reveal that the strengthening is mainly contributed by the precipitation ofβ″phase after two-stage aging,and the number density and size of the precipitates are significantly depended on the pre-aging *** number density of precipitates is increased with the pre-aging time prolonged from 0 h to 4 h,and then decreases with the further increase of pre-aging time from 4 h to 6 *** precipitates with the highest density and smallest size are observed after pre-aging for 4 *** pre-aged at 100℃for 4 h and then artificial aged at 200℃for 3. min,the yield strength of 207 MPa,ultimate tensile strength of 3.5 MPa and elongation of 7.6%are achieved.

关键词： high pressure die cast aluminum alloy microstructural heterogeneity mechanical properties precipitation strengthening two-stage aging

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