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A Mg^(2+)/polydopamine composite hydrogel for the acceleration of infected wound healing

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Bioactive Materials 2022年第9期7卷 203-213页

作者： Zhaoyuan Guo zhuangzhuang zhang Nan zhang Wenxia Gao Jing Li Yuji Pu Bin He Jing Xie College of Chemistry and Materials Engineering Wenzhou UniversityWenzhou325035China National Engineering Research Center for Biomaterials College of Biomedical EngineeringSichuan UniversityChengdu610065China Department of Stomatology The First Affiliated Hospital of Wenzhou Medical UniversityWenzhou325000China

Bacterial infection is a vital factor to delay the wound healing process.The antibiotics abuse leads to drug resistance of some pathogenic bacteria.Non-antibiotic-dependent multifunctional biomaterials with accelerated wound healing performance are urgently desired.Herein,we reported a composite antibacterial hydrogel PDA-PAM/Mg^(2+)that shows excellent self-healing and tissue adhesive property,and photothermal antibacterial functions for accelerating wound healing.The gel was composed of polyacrylamide(PAM),polydopamine(PDA),and magnesium(Mg^(2+))and prepared via a two-step procedure:an alkali-induced dopamine pre-polymerization and followed radical polymerization process.The composite gel shows excellent tissue adhesiveness and Mg^(2+)-synergized photothermal antibacterial activity,inducing a survival rate of 5.29% for S.aureus and 7.06%for E.coli after near infrared light irradiation.The composite hydrogel further demonstrated efficient bacteria inhibition,enhanced wound healing and collagen deposition in a full-thickness skin defect rat model.Together,the PDA-PAM/Mg^(2+) hydrogel presents an excellent wound dressing with excellent tissue adhesion,wound healing,and antibacterial functions.

关键词： Multifunctional hydrogel Self-healing Tissue adhesiveness Photothermal antibacterial effect Wound healing

Synthesis of multicore-shell FeS_(2)@C nanocapsules for stable potassiumion batteries

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Journal of Energy Chemistry 2022年第10期31卷 126-132,I0004页

作者： zhuangzhuang zhang Liping Duan Yifan Xu Chuanfeng Zhao Jianchun Bao Jian Shen Xiaosi Zhou Jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Center of Biomedical Functional MaterialsSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023JiangsuChina

Transition-metal sulfides are widely used as anodes for potassium-ion batteries(PIBs) due to their low cost and high theoretical capacity.The practical application of such materials,however,is still impeded by their inherent low conductivity and obvious volume change during cycling.Herein,a flexible etchassisted sulfidation strategy is reported.According to the strategy,the multicore-shell(MCS) nanocapsule structure is constructed,and then mesoporous FeS2 nanoparticles are encapsulated in the hollow carbon shell with adjustable interior space.The product,MCS-FeS2@C-20,not only features optimized inner space,but also delivers a large reversible capacity(519 mAh g^(-1) at a current density of 50 mA g^(-1)),good rate capability(107 mAh g^(-1) at a high current density of 5 A g^(-1)) and excellent cycling stability(capacity retention rate of 84.2% over 500 cycles at 0.5 A g^(-1)),making it the promising anode material for PIBs.Notably,potassium-ion full cells(MCS-FeS_(2)@C-20//K_(0.4)CoO_(2)) also show an improved potassium storage performance.

关键词： Potassium-ion battery Anode FeS_(2) Yolk-shell structure Carbon protection

In-situ anion exchange based Bi_(2)S_(3)/OV-Bi_(2)MoO_(6)heterostructure for efficient ammonia production:A synchronized approach to strengthen NRR and OER reactions

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Journal of Materials Science & Technology 2022年第15期110卷 152-160页

作者： Yuanyuan zhang Li Guo Yingxian Wang Tianyu Wang Taoxia Ma zhuangzhuang zhang Danjun Wang Bin Xu Feng Fu Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry&Chemical EngineeringYan’an UniversityYan’an 716000China Key Laboratory of Synthetic and Natural Functional Molecule Chemistry College of Chemistry&Materials ScienceNorthwest UniversityXi’an 710127China State Key Laboratory of Organic-Inorganic Composites Beijing Key Laboratory of Electrochemical Process and Technology for MaterialsBeijing University of Chemical TechnologyBeijing 100029China

Photocatalytic ammonia generation via nitrogen reduction reaction(NRR)is a green and prospective nitrogen fixation technique.However,NRR is often hampered by the high N_(2) adsorption/activation energies and is accompanied by a slow kinetics oxygen evolution reaction(OER).Herein,a robust Bi_(2)S_(3)/OVBi_(2)MoO_(6)S-scheme heterojunction is constructed using a simple in-situ anion exchange process,which enables oxygen vacancy(OVs)abundant Bi_(2)Mo O_(6) microspheres with surface deposited Bi_(2)S_(3).The asfabricated Bi_(2)S_(3)/OVBi_(2)MoO_(6) functioned as an effective photocatalyst to convert N_(2)-to-NH_(3) under mild conditions.The photocatalytic NH_(3)/NH_(4)^(+) production rate reached 126μmol g_(cat)^(-1)under visible light for2.5 h with 2%of Bi_(2)S_(3)/OVBi_(2)MoO_(6)photocatalyst,which was 8-fold higher than pristine Bi_(2)MoO_(6).Furthermore,the as-fabricated Bi_(2)S_(3)/Bi_(2)MoO_(6)heterojunction exhibited good selectivity,high stability and reproducibility.The excellent photocatalytic NRR performance was ascribed to the Bi_(2)S_(3)/Bi_(2)MoO_(6)heterojunction formed subsequent to the strong interaction between Bi_(2)S_(3)and Bi_(2)MoO_(6).The OVs facilitated the chemical adsorption process allowing activation of N_(2)molecule on the Bi_(2)S_(3)/Bi_(2)MoO_(6).Simultaneously,the S-scheme heterojunction prolonged the lifetime of photogenerated carriers,accelerated the electrons/holes spatial separation and accumulation on the Bi_(2)S_(3)(reduction)and Bi_(2)MoO_(6)side(oxidation),respectively,thus strengthening both OER and NRR half-reactions.This simple in-situ anion exchange method offers a novel technique for strengthening OER and NRR half-reactions in Bi-based photocatalysts for effective photocatalytic ammonia generation.

关键词： Anion exchange method Bi_(2)S_(3)/Bi_(2)MoO_(6)s-scheme heterojunction Nitrogen activation Photocatalytic ammonia generation

Sn_(4)P_(3)nanoparticles confined in multilayer graphene sheets as a high-performance anode material for potassium-ion batteries

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Journal of Energy Chemistry 2022年第3期31卷 413-421,I0011页

作者： Yichen Du Zuyue Yi Bingbing Chen Jingyi Xu zhuangzhuang zhang Jianchun Bao Xiaosi Zhou Jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Center of Biomedical Functional MaterialsSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023JiangsuChina

Phosphorus-based anodes are highly promising for potassium-ion batteries(PIBs)because of their large theoretical capacities.Nevertheless,the inferior potassium storage properties caused by the poor electronic conductivity,easy self-aggregation,and huge volumetric changes upon cycling process restrain their practical applications.Now we impregnate Sn_(4)P_(3)nanoparticles within multilayer graphene sheets(Sn_(4)P_(3)/MGS)as the anode material for PIBs,greatly improving its potassium storage performance.Specifically,the graphene sheets can efficiently suppress the aggregation of Sn_(4)P_(3)nanoparticles,enhance the electronic conductivity,and sustain the structural integrity.In addition,plenty of Sn_(4)P_(3)nanoparticles impregnated in MGS offer a large accessible area for the electrolyte,which decreases the diffusion distance for K^(+)and electrons upon K^(+)insertion/extraction,resulting in an improved rate capability.Consequently,the optimized Sn_(4)P_(3)/MGS containing 80 wt%Sn_(4)P_(3)(Sn_(4)P_(3)/MGS-80)exhibits a high reversible capacity of 378.2 and 260.2 m Ah g;at 0.1 and 1 A g^(-1),respectively,and still delivers a large capacity retention of 76.6%after the 1000th cycle at 0.5 A g^(-1).

关键词： Sn4P3 Multilayer graphene sheets Ball milling Potassium-ion batteries Anode

Pre-constructed SEI on graphite-based interface enables long cycle stability for dual ion sodium batteries

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Chinese Chemical Letters 2023年第7期34卷 323-326页

作者： Bao Li Bobo Cao Xinxin Zhou zhuangzhuang zhang Dongmei Dai Mengmin Jia Dai-Huo Liu Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals Key Laboratory of Green Chemical Media and ReactionsMinistry of EducationSchool of Chemistry and Chemical EngineeringHenan Normal UniversityXinxiang 453007China

Lithium batteries have been widely used in all over the world for its high energy density, long-term cycle stability. While the resources of lithium metal and transition metal are limited, which restrict their applications in the grid energy storage. Dual ion sodium batteries(DISBs) possess higher energy density,especially owning high power density for its higher operating voltage(> 4.5 V). Nevertheless, the poor oxidation tolerance of carbonate electrolyte and the co-intercalation of solvents accompanied with anions are main obstacles to make the DISBs commercialization. Herein, a physical barrier(artificial SEI film) is pre-constructed in the Na||graphite batteries to solve these thorny problems. With the CSMG(covered SEI on modified graphite), batteries deliver higher capacity 40 mAh/g even under the current density of 300 mA/g and the capacity retention maintains very well after 100 cycles at a high operating voltage.Moreover, the function mechanism was revealed by in-situ XRD, demonstrating that the pre-constructed SEI can effectively suppress the irreversible phase transition and exfoliation of graphite, resulting from the co-intercalation of anions. Additionally, the work voltage windows of carbonate electrolyte are significantly broadened by establishing electrode/electrolyte interphase. This method opens up an avenue for the practical application of DISBs on the grid energy storage and other fields.

关键词： Dual ion sodium batteries Carbonate electrolyte High voltage Anion co-intercalation Pre-constructed SEI

Research of Risk Identification and Prevention of Underground Pressure Pipelines Damage Caused by External Disturbance

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Journal of Architectural Research and Development 2023年第3期7卷 31-39页

作者： Xinxing Han zhuangzhuang zhang Hefei Institute for Public Safety Research Tsinghua UniversityHefei 230601Anhui ProvinceChina Operation and Monitoring Center for Hefei Urban Safety&Security Hefei 230601Anhui ProvinceChina Anhui Province Key Laboratory of Human Safety Hefei 230601Anhui ProvinceChina

External disturbance is an important cause of underground pressure pipeline damage,which leads to accidents,and it is crucial to study the risk of damage caused by external disturbance and come up with proper prevention and control measures.We reviewed literature on risk identification of underground pressure pipelines damage due to external disturbance was conducted,and a list of risk factors was formed.Based on the list of risk factors,fault tree analysis was carried out on underground pressure pipelines damage caused by external disturbances,and risk prevention and control measures were proposed through the calculation of minimum cut sets,minimum path sets,and structural importance,in hopes of providing reference for the normal operation of underground pressure pipelines.

关键词： Underground pressure pipeline damage External disturbance Risk identification Fault tree Risk prevention and control

Catalytic performance of imidazole modified HZSM-5 for methanol to aromatics reaction

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Journal of Energy Chemistry 2017年第3期26卷 574-583页

作者： Haifeng Tian zhuangzhuang zhang Hui Chang Xiaoxun Ma College of Chemical Engineering Northwest UniversityXi’an 710069ShaanxiChina Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy Xi’an 710069ShaanxiChina Research Center of Engineering Technology for Clean Coal Conversion Xi’an 710069ShaanxiChina

A facile approach was developed for the preparation of nano-sized HZSM-5 with a hierarchical mesoporous structure by adding imidazole into conventional zeolite synthesis precursor solution. The physicochemical properties of modified HZSM-5 were characterized by X-ray diffraction（XRD）, N;adsorption–desorption isotherms, scanning electron microscopy（SEM）, NH;-temperature-programmed desorption（NH;-TPD） and pyridine adsorption infrared spectroscopy（Py-IR）. The coke in spent catalysts was characterized by thermogravimetry（TG）. The results showed that hierarchical HZSM-5 zeolites with excellent textural properties, such as abundant porous structure, uniform particle size and suitable acidity, could be synthesized by the recipe of one-pot synthesis routes. Moreover, the obtained HZSM-5 exhibited higher selectivity of total aromatics as well as longer lifetime in the catalytic conversion of methanol to aromatics, comparing with conventional HZSM-5. It is expected that the synthesis approach demonstrated here will be applicable to other zeolites with particular textural properties and controllable particle sizes, facilitating the emergence of new-type porous materials and their related applications in catalysis and separation.

关键词： Imidazole HZSM-5 Methanol Aromatics

Recent Progress and Prospects of Layered Cathode Materials for Potassium-ion Batteries

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Energy & Environmental Materials 2021年第2期4卷 178-200页

作者： Jiaying Liao Yu Han zhuangzhuang zhang Jingyi Xu Jianbo Li Xiaosi Zhou Jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Center of Biomedical Functional MaterialsSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023China

Layered materials with two-dimensional ion diffusion channels and fast kinetics are attractive as cathode materials for secondary batteries.However,one main challenge in potassium-ion batteries is the large ion size of K^(+),along with the strong K^(+)-K^(+)electrostatic repulsion.This strong interaction results in initial K deficiency,greater voltage slope,and lower specific capacity between set voltage ranges for layered transition metal oxides.In this review,a comprehensive review of the latest advancements in layered cathode materials for potassium-ion batteries is presented.Except for layered transition metal oxides,some polyanionic compounds,chalcogenides,and organic materials with the layered structure are introduced separately.Furthermore,summary and personal perspectives on future optimization and structural design of layered cathode materials are constructively discussed.We strongly appeal to the further exploration of layered polyanionic compounds and have demonstrated a series of novel layered structures including layered K_(3)V_(2)(PO_(4))_(3).

关键词： cathode layered material potassium-ion battery structural regulation

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基于狮群优化算法的机床主轴热特性分析

机械强度 2024年第3期46卷 708-716页

作者：张壮壮王红军王增新北京信息科技大学机电工程学院北京100096 北京高端装备智能感知与控制国际科技合作基地北京100192 教育部现代测控技术重点实验室北京100192 北京超同步股份有限公司北京101500

热误差对于主轴的回转精度至关重要,而对流换热系数的精确计算是有限元稳态热分析获得精确结果的前提。通过利用狮群优化(Lion Swarm Optimization,LSO)算法对主轴的对流换热系数进行优化,LSO相对于遗传算法等其他优化算法有更快的收敛... 详细信息

热误差对于主轴的回转精度至关重要,而对流换热系数的精确计算是有限元稳态热分析获得精确结果的前提。通过利用狮群优化(Lion Swarm Optimization,LSO)算法对主轴的对流换热系数进行优化,LSO相对于遗传算法等其他优化算法有更快的收敛速度、更高的精度、更能较好地获得全局最优解。首先,通过使用Lion的热分析模块测量主轴系统的关键点温度和主轴的热伸长。其次,通过经验公式计算主轴不准确但接近真实的对流换热系数值,不准确的对流换热系数会导致不准确的有限元仿真温度结果,因此使用LSO对对流换热系数寻优,将对流换热系数被视为感兴趣的目标值,实验温度值与模拟温度值之间的均方根误差被视为适应度函数。在150代之后,搜索了误差最小的最佳对流换热系数。最后,通过对搜索到的最优对流换热系数进行主轴系统的有限元稳态热分析,并与实验结果进行比较,证明了所提方法的有效性。

关键词：机床主轴热特性对流换热系数狮群优化算法 Ansys