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Science China Chemistry 2024年第2期67卷 551-557页

作者： Zhenzhen Wu Jing Wang Lili Liu Shang Guo Juan Li xianming zhang Shanxi Institute for Functional Food Shanxi Agricultural UniversityTaiyuan030031China Institute of Crystalline Materials Shanxi UniversityTaiyuan030006China Key Laboratory of Interface Science and Engineering in Advanced Materials College of ChemistryTaiyuan University of TechnologyTaiyuan030024China

Covalent organic frameworks(COFs) are a potential platform for carbon dioxide(CO_(2)) conversion owing to their periodic permanent porosity,adjustable structure,and chemical stability.For good catalytic performance in CO_(2) conversion,collaborative multifunctions should be strategically integrated into the catalytic system design and construction.In this study,a four-in-one high-efficiency catalyst was synthesized and tested for CO_(2) cycloaddition to form cyclic carbonate.The obtained Tp-MPB-BrCOF had a high nitrogen content,which enhanced its CO_(2) affinity through substantial Lewis acid-base or dipole-quadrupole interactions;moreover,the acid(protons transferring from oxygen(–OH) to nitrogen(–NH)),hydrogen bond donor(hydroxyl group),and Br-(nucleophile group) served as three active sites,further improving the catalyst activity.These results provide a basis for designing efficient and stable CO_(2)-conversion catalysts.

关键词： covalent organic framework C2-phenyl-substituted benzimidazolium CO_(2)conversion four-in-one catalyst

Formation characteristics of Taylor bubbles in a T-junction microchannel with chemical absorption

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Chinese Journal of Chemical Engineering 2022年第6期35卷 214-222页

作者： Yaran Yin xianming zhang Chunying Zhu Taotao Fu Youguang Ma National Engineering Laboratory for Textile Fiber Materials and Processing Technology(Zhejiang) School of Materials Science and EngineeringZhejiang Sci-Tech UniversityHangzhou 310018China State Key Laboratory of Chemical Engineering School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

This study focuses on the effect of chemical absorption on the formation dynamic characteristics and initial length of Taylor bubbles.The temporal evolutions of neck width and length of gaseous thread and initial length with and without chemical absorption were investigated with the Capillary number and Hatta number between 0.0010–0.0073 and 1.8–5.8 respectively.The squeezing regime with typical three stages,expansion,squeezing and pinch off is observed for both two processes.Compared with the nonabsorption process,the increase of formation time in the chemical absorption process arises mainly from the expansion stage,and the decrease of initial length is from the necking stage.In addition,the temporal length evolution satisfies the power-law scale with the same exponent but a smaller pre-exponential factor.The correlations of neck width for stage transition and initial length with Hatta number demonstrate the enhancement effect of chemical absorption on bubble formation dynamics and initial length at relatively high chemical reaction rates and long formation time.This study provides insight into the bubble formation mechanism and helps to regulate the bubble initial size with chemical absorption.

关键词： Microchannels Absorption Bubble Formation dynamics

Mg-Fe LDH sealed PEO coating on magnesium for biodegradation control,antibacteria and osteogenesis

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Journal of Materials Science & Technology 2022年第10期105卷 57-67页

作者： Dongdong zhang Jielong Zhou Feng Peng Ji Tan xianming zhang Shi Qian Yuqin Qiao Yu zhang Xuanyong Liu State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Department of Orthopedics Guangdong Provincial People’s HospitalGuangdong Academy of Medical SciencesGuangzhouGuangdong 510080China School of Chemistry and Materials Science Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of Sciences1 Sub-lane XiangshanHangzhou 310024China Cixi Center of Biomaterials Surface Engineering Shanghai Institute of CeramicsChinese Academy of SciencesNingbo 315300China

Attempt of developing bio-safety and functional layered double hydroxides(LDHs)modifed plasma electrolytic oxidation(PEO)coatings,has become a hotspot in the protection of magnesium(Mg)based biomedical implants.In the present work,Mg-Fe LDH flms with different Fe contents were fabricated on PEO coating via a novel two-step method:frstly,the Fe OOH flms were prepared by immersing PEO sample in Fe^(2+)-containing solution,and then Mg-Fe LDH flms were formed by transforming the Fe OOH flms via a hydrothermal treatment in water.The highly-oriented LDH nano-sheets could enhance the anti-corrosion performance of PEO coating,which was proved by the results of electrochemical test,hydrogen evolution and corroded morphology.PEO/Mg-Fe LDH coatings showed a low hemolysis rate(less5%)than PEO coating.In addition,PEO/Mg-Fe LDH coatings were more favorable for cell adhesion and proliferation than PEO coating.Moreover,PEO/Mg-Fe LDH coatings showed good photothermal conversion property,which demonstrated the excellent rapid antibacterial effect under NIR light.In vitro culture of rat bone marrow stem cell(r BMSC)suggested that cells cultured in the extract of PEO/Mg-Fe LDH coatings had a better osteogenic activity.In vivo subcutaneous implantation test revealed that PEO/Mg-Fe LDH coatings exhibited good anti-corrosion and histocompatibility.

关键词： Magnesium Plasma electrolytic oxidation Layered double hydroxide Anti-corrosion Anti-bacteria Osteogenesis

Microenvironment-responsive electrocution of tumor and bacteria by implants modified with degenerate semiconductor film

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Bioactive Materials 2023年第2期20卷 472-488页

作者： Donghui Wang Shun Xing Feng Peng xianming zhang Ji Tan Xueqing Hao Yuqin Qiao Naijian Ge Xuanyong Liu State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China School of Health Sciences and Biomedical Engineering Hebei University of TechnologyTianjin300130China Department of Orthopedics Guangdong Provincial People’s HospitalGuangdong Academy of Medical SciencesGuangzhouGuangdong510080China Intervention Center Eastern Hepatobiliary Surgery HospitalThe Third Affiliated Hospital of Naval Medical UniversityShanghai200438China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China School of Chemistry and Materials Science Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of Sciences1 Sub-lane XiangshanHangzhou310024China

Implantable biomaterials are widely used in the curative resection and palliative treatment of various types of cancers.However,cancer residue around the implants usually leads to treatment failure with cancer reoccurrence.Postoperation chemotherapy and radiation therapy are widely applied to clear the residual cancer cells but induce serious side effects.It is urgent to develop advanced therapy to minimize systemic toxicity while maintaining efficient cancer-killing ability.Herein,we report a degenerate layered double hydroxide(LDH)film modified implant,which realizes microenvironment-responsive electrotherapy.The film can gradually transform into a nondegenerate state and release holes.When in contact with tumor cells or bacteria,the film quickly transforms into a nondegenerate state and releases holes at a high rate,rendering the“electrocution”of tumor cells and bacteria.However,when placed in normal tissue,the hole release rate of the film is much slower,thus,causing little harm to normal cells.Therefore,the constructed film can intelligently identify and meet the physiological requirements promptly.In addition,the transformation between degenerate and nondegenerate states of LDH films can be cycled by electrical charging,so their selective and dynamic physiological functions can be artificially adjusted according to demand.

关键词： Electrotherapy Implant Layered double hydroxides Anti-Tumor Antibiosis

Single-Molecule Confinement Induced Intrinsic Multi-Electron Redox-Activity to Enhance Supercapacitor Performance

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Energy & Environmental Materials 2023年第4期6卷 227-238页

作者： Su Yang Meiling Wang Yong zhang Pinyi He Wenhua Cong Chongji Wang Qiankun Yang Xuguang Liu Tian Wang xianming zhang Jiadong Zhou College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement(Ministry of Education) Beijing Key Lab of Nanophotonics&Ultrafine Optoelectronic Systemsand School of PhysicsBeijing Institute of TechnologyBeijing 100081China School of Materials Science and engineering Central South UniversityChangsha 410083China Department of Chemistry National University of Singapore3 Science Drive 3117543Singapore Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education (Taiyuan University of Technology)Taiyuan 030024China

Aggregation of polyoxometalates(POM)is largely responsible for the reduced performance of POM-based energy-storage systems.To address this challenge,here,the precise confinement of single Keggin-type POM molecule in a porous carbon(PC)of unimodal super-micropore(micro-PC)is realized.Such precise single-molecule confinement enables sufficient activity center exposure and maximum electron-transfer from micro-PC to POM,which well stabilizes the electron-accepting molecules and thoroughly activates its inherent multi-electron redox-activity.In particular,the redox-activities and electron-accepting properties of the confined POM molecule are revealed to be super-micropore pore size-dependent by experiment and spectroscopy as well as theoretical calculation.Meanwhile,the molecularly dispersed POM molecules confined steadily in the“cage”of micro-PC exhibit unprecedented large-negative-potential stability and multiple-peak redox-activity at an ultra-low loading of~11.4 wt%.As a result,the fabricated solid-state supercapacitor achieves a remarkable areal capacitance,ultrahigh energy and power density of 443 mF cm^(-2),0.12 mWh cm^(-2)and 21.1 mW cm^(-2),respectively.This work establishes a novel strategy for the precise confinement of single POM molecule,providing a versatile approach to inducing the intrinsic activity of POMs for advanced energy-storage systems.

关键词： intrinsic redox-activity polyoxometalates single-molecule confinement supercapacitor

医用钛表面石墨烯薄膜的PECVD法制备及其性能

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表面技术 2024年第8期53卷 156-162,190页

作者：张宪明蔡丁森钱仕慈溪生物材料表面工程中心浙江宁波315300 中国科学院上海硅酸盐研究所高性能陶瓷与超微结构国家重点实验室上海200050

目的在医用钛表面制备石墨烯薄膜,研究生长时间对石墨烯薄膜理化性能和生物学性能的影响。方法采用等离子体增强化学气相沉积设备,在医用钛表面制备石墨烯薄膜,控制石墨烯薄膜生长时间为5、10、30 min。通过拉曼光谱、扫描电子显微镜、... 详细信息

目的在医用钛表面制备石墨烯薄膜,研究生长时间对石墨烯薄膜理化性能和生物学性能的影响。方法采用等离子体增强化学气相沉积设备,在医用钛表面制备石墨烯薄膜,控制石墨烯薄膜生长时间为5、10、30 min。通过拉曼光谱、扫描电子显微镜、接触角测量仪和电化学工作站对石墨烯薄膜的结构、表面形貌、表面润湿性和耐腐蚀性进行表征,通过小鼠成骨细胞培养评价石墨烯薄膜的细胞相容性。结果薄膜的拉曼结果呈现石墨烯的D、G和2D特征峰。生长时间为10 min和30 min的石墨烯薄膜在医用钛表面呈现垂直纳米片状态。随着生长时间的延长,医用钛表面石墨烯薄膜的水接触角逐渐增大。3组样品中,生长时间为5 min的样品具有最小的腐蚀电流密度(1.822×10^(‒7)A/cm^(2)),生长时间为10 min的样品具有最高的腐蚀电位(‒0.404 V);生长时间为5 min和10 min的样品有利于细胞的黏附与铺展,生长时间为30 min的样品对小鼠成骨细胞活性具有一定的抑制作用。结论石墨烯薄膜可以有效提高医用钛的耐腐蚀性。石墨烯薄膜生长时间影响其形貌,进而改变水接触角。不同生长时间的石墨烯薄膜对小鼠成骨细胞的黏附和铺展表现出明显的差异。

关键词：等离子体增强化学气相沉积医用钛石墨烯耐腐蚀性细胞相容性

Novel method for separation and screening of lubricant-degrading microorganisms and bacterial biodegradation

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Chinese Journal of Chemical Engineering 2016年第3期24卷 353-359页

作者： Yan Jiang Hui Qi xianming zhang Engineering Research Centre for Waste Oil Recovery Technology and Equipment Ministry EducationChongqing Technology and Business University College of Foreign Languages Chongqing Technology and Business University

With the rapid increase of lubricant consumption,oil contamination becomes more serious.Biotreatment is an important method to remove oil contamination with some advantages.In this study,acclimatized oilcontaminated soil and used lubricating oil were sampled to isolate lubricant-degrading strains by several methods.51 isolates were obtained and 24-well plates were employed to assess bacterial potential in highthroughput screening.The method was noted for the prominence of oil–water two-phase system with saving chemicals,shortening cycles and lessening workloads.In order to decrease inaccuracy,subculture and resting cells were inoculated into mineral salt medium with 200 μl oil in well plates for the cultivation at 37 °C for 5and 7 days,and the biodegradation potential was characterized by the changes of oil film and cell density.With appropriate evaluation by shaking flask tests,5 isolates were retained for their potentials with the maximum biodegradation from 1500 to 2200 mg · L^(-1)and identified as Acidovorax citrulli,Pseudomonas balearica,Acinetobacter johnsonii(two isolates with different biodegradation potentials)and Acidovorax avenae using 16 S r RNA sequencing analysis.Also,lipase activity was determined using indicator titration and p-nitrophenyl palmitate(p-NPP)methods.The results indicated that only p-NPP was successful to test lipase activity with the range of 1.93–6.29 U · ml^(-1).Although these five strains could degrade 1000 mg · L^(-1)lubricating oil in158–168 h,there existed distinct difference in enzyme activity,which demonstrates that lipase activity could not be used as the criterion to evaluate microbial biodegradation potential for petroleum hydrocarbons.

关键词：微生物降解分离筛选润滑油降解微生物细菌脂肪酶活性 avenae 基因序列分析

Tunable Nonlinear Optical Property and Photocatalytic Activity on Luminescent Chiral Lanthanide Chains

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中国化学:英文版 2014年第12期32卷 1259-1266页

作者： Mei Qu Minmin Liu Jiang Liu xianming zhang School of Chemistry&Material Science Shanxi Normal UniversityLinfenShanxi 041004China

Five chiral(P2_(1))isostructural lanthanide coordination complexes Ln(pic)_(3)[pic=picolinic acid,Ln=La(1),Gd(2),Nd(3),Sm(4)and Eu(5)]have been hydrothermally generated,featuring one dimensional right-handed 2_(1)helical chains constructed from LnN_(3)O_(6)of square antiprism geometry and N,O-chelated pic−groups,in which 3,4 and 5 have been reported,but we explore undiscovered properties of their own systematically.In special,1 undergoes an abnormal transformation of symmetry as the temperature cooling to 100 K.TG-DSC studies demonstrated that all isologues have good thermal stability with the decomposition temperature up to 400℃.Then,UV-Vis-NIR transmission spectroscopy measurements indicated that they possess a short-wavelength absorption edge onset at 377 nm,corresponding to the optical band gap of 3.29 eV.Meanwhile,powder second harmonic generation(SHG)measurements revealed that the SHG intensity of 1,2,4 and 5 may be about 1.2,2.0,0.9 and 0.75 times that of KH_(2)PO_(4),respectively.Interestingly,1 and 3 exhibit efficient photocatalytic degradation for MB(Methylene Blue)upon UV-light irradiation.Moreover,both 1 and 2 show strong blue luminescence.

关键词： lanthanides nonlinear optics degradation luminescence

Residence time distribution of high viscosity fluids falling film flow down outside of industrial-scale vertical wavy wall: Experimental investigation and CFD prediction

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Chinese Journal of Chemical Engineering 2019年第7期27卷 1586-1594页

作者： Shichang Chen Lihao zhang Yongjun Wang xianming zhang Wenxing Chen National Engineering Laboratory for Textile Fiber Materials and Processing Technology (Zhejiang) Zhejiang Sci-Tech University

The flow behavior of gravity-driven falling film of non-conductive high viscosity polymer fluids on an industrial-scale vertical wavy wall was investigated in terms of film thickness and residence time distribution by numerical simulation and experiment.Falling film flow of high viscosity fluids was found to be steady on a vertical wavy wall in the presence of the large film thickness.The comparison between numerical simulation and experiment for the film thickness both in crest and trough of wavy wall showed good agreement.The simulation results of average residence time of falling film flow with different viscous fluids were also consistent with the experimental results.This work provides the initial insights of how to evaluate and optimize the falling film flow system of polymer fluid.

关键词： Falling film flow High viscosity polymer fluid Residence time distribution Film thickness Numerical simulation

Experimental results for the vapor-liquid equilibria of 0(formaldehyde+1,3,5-trioxane+methanol+salt+water)systems and comparison with predictions

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Chinese Journal of Chemical Engineering 2021年第4期34卷 291-300页

作者： xianming zhang Mengchen Li Yufeng Hu Zhichang Liu Shuqin Mo State Key Laboratory of Heavy Oil Processing and High Pressure Fluid Phase Behavior&Property Research Laboratory China University of PetroleumBeijing 102249China School of Chemical Engineering Ordos Institute of TechnologyOrdos 017000China PetroChina Petrochemical Research Institute Science Base PetroChina Beijing 102206China

The salt effect on the vaporliquid phase equilibrium(VLE)of solvent mixtures is of significant interest in the industrial production of 1,3,5trioxane.Experimental data for the VLE of quinary systems(formaldehyde+1,3,5trioxane+methanol+salt+water)and their ternary subsystems(formaldehyde+salt+water),(1,3,5trioxane+salt+water),and(methanol+salt+water)were systematic measured under atmospheric pressure.The salts considered included KBr,NaNO_(3),and CaCl_(2).The extended UNIFAC model was used to describe the VLE of the saltcontaining reactive mixtures.The model parameters were determined from the experimental VLE data of ternary systems or obtained from the literature,and then were used to predict the VLE of systems(1,3,5trioxane+KBr+water),(methanol+KBr+water),(formaldehyde+KBr+water),and(formaldehyde+1,3,5trioxane+methanol+salt+water)with salt=KBr,NaNO_(3),and CaCl_(2).The predicted results showed good agreements with the measured results.Furthermore,the model was used to uncover the salt effect on the VLE of these multisolvent reactive systems.

关键词： Vapor liquid equilibria Reactive distillation Activity coefficient 1,3,5-Trioxane production UNIFAC Salt effect