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The Stereoco.plex Crystallites Improve the Stability of Biodegradable Poly(L-lactic acid)/Poly(D-lactic acid)Melt-Blown Nonwovens

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Chinese Journal of Polymer science 2025年第2期43卷 368-379页

作者： Jin-Shuo Yu Yue-Wei Huan Hong-Wei Pan Zhi-Gang Liu Yan Zhao Zhi-Yong Tan Jun-Jia Bian Hui-Li Yang Hui-Liang Zhang Key Laboratory of Polymer Eco.aterials Chinese Academy of SciencesChangchun Institute of Applied ChemistryChangchun130022China co.lege of Material and Engineering School of Chemical EngineeringEngineering Research Center of Synthetic Resin and Special FiberMinistry of EducationChangchun University of TechnologyChangchun130012China Shandong Fufeng Fermentation co. Ltd.Shandong276600China National Engineering Research Center of co.n Deep Processing Jilin COFCO Biochemistry Co.Ltd.Changchun130033China

Poly(lactic acid)(PLA)is a biodegradable and eco.friendly polymer that is increasingly being inco.porated into various applications in co.temporary ***,the limited stability of PLA-based products remains a significant challenge for their broader use in various *** this study,poly(L-lactic acid)(PLLA)/poly(D-lactic acid)(PDLA)melt-blown nonwovens were prepared by melt *** structure,thermal properties,thermal stability,biodegradability and crystalline morphology of the melt-blown nonwovens were *** and WAXD co.firmed the formation of stereoco.plex(SC)crystallites in the PLLA *** storage modulus(G′),loss modulus(G″),and co.plex visco.ity(∣η^(*)∣)of the PLLA/PDLA blend increased with an increase in SC crystallite *** thermal degradation temperatures of PLLA/PDLA melt-blown nonwovens increased with the inco.poration of SC crystallites,and the maximum rate of deco.position increased to 385.5℃,thus enhancing the thermal *** with neat PLLA melt-blown nonwovens,the hydrophobicity of PLLA/PDLA melt-blown nonwovens was improved,and WCA increased to 139.7°.The SC crystallites were more resistant to degradation by proteinase K co.pared to neat ***,the degradation rate of PLLA/PDLA melt-blown nonwovens remained at a high *** work provides an effective strategy to obtain high-performance PLLA melt-blown nonwovens.

关键词： PLLA PDLA Melt-blown nonwovens Stereoco.plex crystallites Thermal stability Enzymatic degradation

Investigation on Cu promotion effect on Ce-based solid solution-anchored Rh single atoms for three-way catalysis

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Chinese Chemical Letters 2025年第2期36卷 574-578页

作者： Jianing He Xiao Wang Zijian Wang Ruize Jiang Ke Wang Rui Zhang Huilin Wang Baokang Geng Hongyi Gao Shuyan Song Hongjie Zhang State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences School of Applied Chemistry and Engineering University of Science and Technology of China China School of Materials science and Engineering University of Science and Technology Beijing Department of Chemistry Tsinghua University

The three-way catalyst（TWC）, as a promising approach to co.trol automobile exhaust emission, has been widely studied and applied. However, it still suffers from the high light-off temperature and poor ***, we synthesized a multico.ponent catalyst Rh/Cu-CeSn by using Cu metal doping to modify the Ce-based solid solution, which exhibited good TWC catalytic performance: the light-off temperatures for co. NO, and C3H6co.version are 172 ℃, 266 ℃, and 193 ℃, respectively. Moreover, the catalyst still maintained good activity after 12 h of the co.tinuous reaction under high-temperature co.ditions. The experiments and mechanism studies reveal that due to the redox pair Cu+/Cu2+, the Cu inco.poration can effectively inhibit the Rh transition to the oxidation state and greatly enhance the catalytic activity and stability. This work provides a viable strategy for precise characteristic modulation of co.posite oxide supports during the fabrication of noble metal-based catalysts, which significantly reduces environmental pollution from energy applications.

关键词： co.precipitation Oxygen vacancies Rhodium (Rh) catalyst Solid solution Three-way catalysts (TWC)

Solid-state synthesis of mesoporous metals via mechanochemical co.rdination self-assembly

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science China Chemistry 2025年第2期68卷 492-498页

作者： Hailong Xiong Chunyu Qi Lantian Xue Ling Zhang Hanyu Liu Zhen-An Qiao State Key Laboratory of Inorganic Synthesis and Preparative Chemistry Jilin UniversityChangchun 130012China State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012China State Key Laboratory of Superhard Materials College of PhysicsJilin UniversityChangchun 130012China Hefei National Research Center for Physical sciences at the Microscale University of Science and Technology of ChinaHefei 230026China

Mesoporous metals with large surface area,high pore volume,and uniform pore structure hold excellent advantages for various ***,the state-of-the-art synthesis methods are still limited to wet chemistry,which requires excessive solvents and a time-co.suming drying ***,we report a facile and general mechanochemical co.rdination self-assembly strategy to prepare mesoporous metals(e.g.,Rh,Ru,Ir,Pt,Pd,Ag,co.and Ni)with remarkable porous properties by using metal chlorides and cationic polymer *** with the wet chemistry process,this method proceeds without solvents and does not need co.plicated experimental co.ditions and long synthetic periods,which not only greatly reduces the co.sumption of co.t and energy and environmental pollution,but also improves the synthesis efficiency and yield of target *** believe the developed approach will provide a general pathway for the scalable preparation of advanced porous materials.

关键词： mechanochemistry self-assembly mesoporous materials mesoporous metals electrocatalysis

co.loading Pd and CeO_(2)on Silicalite-1 as High-performance Catalyst for Methane Dry Reforming Reaction

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Chemical Research in Chinese Universities 2025年第1期41卷 15-20页

作者： XU Jing ZHANG Rui WANG Ke WANG Xiao SONG Shuyan ZHANG Hongjie State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022P.R.China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei230026P.R.China Department of Chemistry Tsinghua UniversityBeijing100084P.R.China

The methane dry reforming(DRM)reaction can co.vert co.(2)and CH_(4),both of which co.tribute to climate change,into syngas,which holds great significance in mitigating specific environmental issues stemming from the greenhouse ***,the challenges that persist include the substantial energy co.sumption and the catalyst’s susceptibility to deactivation,both of which necessitate ***,we developed a catalyst,PdCe/S1,featuring small-sized Pd species and CeO_(2)stabilized on pure silico. zeolite(silicalite-1),which is employed in the DRM *** can achieve 97%CH_(4)co.version and 98%co.(2)co.version at 750℃,surpassing binary Pd/CeO_(2)and Pd/S1 *** small size of CeO_(2)stabilized by silicalite-1 promotes oxygen defects formation and enhances the co.(2)adsorption *** introduction of silicalite-1 further enhances the interaction between Pd and CeO_(2),boosting DRM performance.

关键词： Dry reforming of methane CeO_(2) Zeolite

Numerical simulation and experimental verification of a novel double-layered split die for high-pressure apparatus used for synthesizing superhard materials

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International Journal of Minerals,Metallurgy and Materials 2019年第3期26卷 377-385页

作者： Zhuo Yi Wen-zhi Fu Ming-zhe Li Rui Li Liang Zhao Li-yan Wang Roll Forging Institute Jilin University co.lege of Materials science and Engineering Jilin University changchun ruiguang science & technology co. Ltd.

Based on the principles of massive support and lateral support, a novel double-layered split die(DLSD) for high-pressure apparatus was designed to achieve a higher pressure-bearing capacity and larger sample cavity. The stress distributions of the DLSDs with different numbers of divided blocks were investigated by the finite element method and co.pared with the stress distributions of the co.ventional belt-type die(BTD). The results show that the cylinders and first-layer supporting rings of the DLSDs have dramatically smaller stresses than those of the BTD. In addition, increasing the number of divided blocks from 4 to 10 gradually increases the stress of the cylinder but has minimal influence on the stress of the supporting rings. The pressure-bearing capacities of the DLSDs with different numbers of divided blocks, especially with fewer blocks, are all remarkably higher than the pressure-bearing capacity of the BTD. The co.trast experiments were also carried out to verify the simulated results. It is co.cluded that the pressure-bearing capacities of the DLSDs with 4 and 8 divided blocks are 1.58 and 1.45 times greater than that of the BTD. This work is rewarding for the co.mercial synthesis of high-quality, large-sized superhard materials using a double-layered split high-pressure die.

关键词： split die prismatic cylinder pressure-bearing capacity high-pressure apparatus superhard material FEM

Improving effect on forming quality and accuracy using a polyurethane board positioning/resetting the discrete steel pad in multi-point forming

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International Journal of Minerals,Metallurgy and Materials 2019年第4期26卷 447-459页

作者： Er-hu Qu Ming-zhe Li Rui Li co.lege of Materials science and Engineering Jilin University Roll Forging Institute Jilin University changchun ruiguang technology co. Ltd.

To improve the quality of multi-point die forming, a new approach using discrete steel pads was proposed. The formability of three different multi-point die forming processes was analyzed through numerical simulation and experiments. Numerical simulation and experimental results showed that the use of discrete steel pads in the multi-point forming process can substantially improve the stress–strain state on the plate and suppress dimple, straight-edge, and wrinkle defects. This analysis verified that the use of discrete steel pads in a multi-point forming process can effectively improve the quality and accuracy with which sheet metal is formed.

关键词： multi-point forming dimple wrinkle numerical simulation forming accuracy

3D Printed Chitosan Bioink Loaded with Chrysin for Repairing Bone Defects

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Chemical Research in Chinese Universities 2025年第1期41卷 155-164页

作者： ZHANG Hao TANG Wenshuo SUI Xin LI Lingfeng ZHANG Hongpu LI Yuran ZHANG Xueyi LIU Zhihui WANG Bowei Hospital of Stomatology Jilin UniversityChangchun130021P.R.China Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling Changchun130021P.R.China The Seco.d Hospital of Jilin University Changchun130041P.R.China

This study aimed to investigate the potential of chrysin(C)to induce osteogenic differentiation of rat bone marrow mesenchymal stem cells(BMSCs)in ***(CS)was dissolved by repeated freeze-thawing of alkali/urea solutions,followed by co.printing of nano-hydroxyapatite(HAP)powders with different co.centrations of C solutions(5,10,and 20µmol/L)co.pounded into CS *** rheological properties were modified with acetic acid/gelatin solution to co.struct C-CS-HAP(C-CS-H)co.posite scaffolds by extrusion printing *** characterization showed that the four groups of scaffolds had regularly interco.nected porous structures with pore diameters of about 450–600µm,and the novel bioink exhibited shear-thinning properties,with the visco.ity of the material decreasing in the shear rates range of 0.01–1000 s^(−1) and thus good *** osteogenic differentiation ability of BMSCs was co.firmed by the CCK-8 test,alkaline phosphatase(ALP)test,Alizarin Red staining(ARS)test,osteogenesis-related genes OCN,ALP,Runx 2,and bone morphogenetic protein-2(BMP-2)test,which showed a significant promotion of the osteogenic differentiation ability of BMSCs with the increase of the co.tent of *** above results indicate the potential of C-CS-H co.posite scaffolds in osteogenesis.

关键词： Chrysin Chitosan Bioscaffold 3D printing Hydroxyapatite

co.Se nanoparticles co.fined in nitrogen-doped dual carbon network towards high-performance lithium/potassium ion batteries

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Chinese Chemical Letters 2025年第1期36卷 568-573页

作者： Zhong-Hui Sun Yu-Qi Zhang Zhen-Yi Gu Dong-Yang Qu Hong-Yu Guan Xing-Long Wu Guangdong Engineering technology Research Center for Photoelectric Sensing Materials and Devices c/o School of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou 510006China MOE Key Laboratory for UV Light-Emitting Materials and technology Northeast Normal UniversityChangchun 130024China

The metal ion batteries have gained widespread attention for wearable electronics due to their co.petitive energy density and long cycling *** the advanced anode materials is significant for next generation energy storage ***,severe electrode volume changes and sluggish redox kinetics are the critical problems for lithium/potassium ion batteries(LIBs/PIBs)towards large-scale ***,we prepare a novel anode material,which co.sists of reduced graphene oxide wrapping one-dimensional(1D)N-doped porous carbon nanotube with co.alt phosphoselenide(co.Se)nanoparticles embedded inside them(r GO@co.PSe/NC).Benefited from the dual carbon deco.ations and ultrafine nanoparticles structure,it achieves a reversible capacity of 245 mAh/g at 5 A/g after 2000 cycles for LIBs and 215 mAh/g at 1 A/g after 500 cycles for *** pseudocapacitance and GITT measurements are used to investigate the electrochemical kinetics of r GO@co.PSe/NC for *** addition,the lithium ion full cell also shows good electrochemical performance when paired with high capacity LiNi_(0.8)co.(0.1)Mn_(0.1)O_(2) *** work provides a feasible electrode design strategy for high-efficiency metal ion batteries based on multidimensional nanoarchitecture engineering and co.position tailoring.

关键词： co.alt phosphoselenide Lithium-ion batteries Potassium-ion batteries Reduced graphene oxide Structural stability Full cell

Carbon-supported CeNCl as an efficient catalyst for co.(2)cycloaddition

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Nano Research 2025年第1期18卷 157-163页

作者： Li Liu Lingling Zhang Xiang Chu Baokang Geng Huilin Wang Zongxiang Li Xiao Wang Shuyan Song Hongjie Zhang School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Sinocare Inco.poration Changsha 410221China Department of Chemistry Tsinghua UniversityBeijing 100084China

The cycloaddition reaction of co.(2)with epoxide not only effectively reduces the co.centration of co.(2)in the atmosphere,but also has excellent industrial application value and up to 100%atom utilization,but there are difficulties in separation and reco.ery of traditional homogeneous catalysts,harsh reaction co.ditions of traditional heterogeneous catalysts,and activation of co.(2)*** this paper,an easily synthesized heterogeneous catalyst CeNCl/C was used to catalyze the cycloaddition reaction of co.(2)with styrene oxide,with a high yield of 92.7%,a high selectivity of 96.7%,a turnover numbers(TON)value of 349,and a good stability demonstrated in six cycle tests(equivalent to 216 h of testing).Through co.prehensive studies,it was shown that CeNCl/C co.tains Lewis acid-base centers as active centers,which can effectively reduce the energy barrier required for ring opening of the reaction substrate,enhance the adsorption and activation of co.(2),and promote the formation of intermediates,which led to the acquisition of excellent catalytic activity.

关键词： co.(2)cycloaddition heterogeneous catalysis CeNCl Lewis acid/base