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Synthesis,characterization of Polyethylene Ionomers and Their Antibacterial Properties

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ch.nese Journal of Polymer Science 2024年第8期42卷 1077-1084页

作者： Jia-Jia Wu Fei Wang Peng-Qi Wan Li Pan ch.n-Sheng xiao zhe Ma Yue-Sheng Li Tianjin Key Lab Composite&Functional Materials School of Materials Science and EngineeringTianjin UniversityTianjin 300350China Key Lab Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China

Owing to its high production volume and wide range of application s,polyethylene has gained a great deal of attention,but its low surface energy and non-polar nature have limited its application in some important *** this study,ethylene/11-iodo-1-undecene copolymers were prepared and used as the intermediates to afford a series of imidazolium-based ionomers bearing methanesulfonate(ch_(3)SO_(3)^(-)),trifluoromethanesulfonate(CF_(3)SO_(3)^(-)),or bis(trifluoromethane)sulfonimide(Tf_(2)n^(-))*** tensile test results showed that the stress-at-break(7.8-25.6 MPa)and the elongation-at-break(445%-847%)of the ionomers could be adjusted by ch.nging the counterion species and the ionic group *** importantly,the ionomers exhibited marvelous antibacterial activities against Staphylococcus aureus(***)and Escherichia coli(***).The ionomers bearing Tf_(2)n^(-)exhibited antibacterial activities>99%against both *** and *** when ionic content reached 9.1%.The imidazolium-based ionomers prepared in this work demonstrated excellent comprehensive properties,especially highefficient and broad-spectrum antibacterial ability,exhibiting the potential fo r the application as the antibacterial materials in packaging,medical,and other fields.

关键词： Polyethylene Ionomer Polymerization catalysis Imidazolium Antibacterial material

Interfacial Electronic Modulation of Dual-Monodispersed Pt–ni_(3)S_(2) as Efficacious Bi-Functional Electrocatalysts for Concurrent H_(2) Evolution and Methanol Selective Oxidation

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nano-Micro Letters 2024年第4期16卷 415-431页

作者： Qianqian zhao Bin zhao Xin Long Renfei Feng Mohsen Shakouri Alisa Paterson Qunfeng xiao Yu zhang Xian‑zhu Fu Jing‑Li Luo Shenzhen Key Laboratory of Energy Electrocatalytic Materials Shenzhen Key Laboratory of Polymer Science and TechnologyGuangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen 518060People’s Republic of China Canadian Light Source Inc. SaskatoonSK S7N 0X4Canada Instrumental Analysis Center of Shenzhen University(Lihu Campus) Shenzhen UniversityShenzhen 518055People’s Republic of China

Constructing the efficacious and applicable bifunctional electrocatalysts and establishing out the mech.nisms of organic electro-oxidation by replacing anodic oxygen evolution reaction(OER) are critical to the development of electrochemicallydriven technologies for efficient hydrogen production and avoid CO_(2) emission. Herein, the hetero-nanocrystals between monodispersed Pt(~ 2 nm) and ni_(3)S_(2)(~ 9.6 nm) are constructed as active electrocatalysts through interfacial electronic modulation, which exhibit superior bi-functional activities for methanol selective oxidation and H_(2) generation. The experimental and theoretical studies reveal that the asymmetrical charge distribution at Pt–ni_(3)S_(2) could be modulated by the electronic interaction at the interface of dual-monodispersed heterojunctions, which thus promote the adsorption/desorption of the chemical intermediates at the interface. As a result, the selective conversion from ch_(3)OH to formate is accomplished at very low potentials(1.45 V) to attain 100 m A cm^(-2) with high electronic utilization rate(~ 98%) and without CO_(2) emission. Meanwhile, the Pt–ni_(3)S_(2) can simultaneously exhibit a broad potential window with outstanding stability and large current densities for hydrogen evolution reaction(HER) at the cathode. Further, the excellent bi-functional performance is also indicated in the coupled methanol oxidation reaction(MOR)//HER reactor by only requiring a cell voltage of 1.60 V to achieve a current density of 50 m A cm^(-2) with good reusability.

关键词： Dual-monodispersed heterostructure Electronic interactive modulation Reaction mech.nism Methanol oxidation reaction Hydrogen generation

Inhibitory activity of polysaccharide extracts from three kinds of edible fungi on proliferation of human hepatoma SMMC-7721 cell and mouse implanted S180 tumor

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World Journal of Gastroenterology 1999年第5期5卷 404-407页

作者： Jiang SM xiao ZM Xu zh Shandong normal Univ Dept Biol Provincial Key Lab Anim Stress Jinan 250014 Shandong Prov Peoples R China Univ Heidelberg D-6900 Heidelberg Germany

AIM To determine the activities ofpolysaccharide extracts from Flammulina velutipes (Curt. ex Fr. ) Sing (FV), Lentinusedodes (LE) and Agaricus bisporus Sing (AB)on the proliferation of human hepatoma SMMC-7721 cells in vitro and on mouse implanted S-180tumors in *** The polysaccharide extracts were isolated from the fruit bodies of FV, LE and AB by the methods of hot-water extraction, Sevag’sremoval of proteins, ethanol precipitation,trypsin digestion and ethanol fractionalprecipitation. Human hepatoma SMMC-7721 cells were treated with 50 mg/L Polysaccharide extracts, and the mitosis index, mitoch.ndria activity and cell proliferation were detected at different times in both control and experimental groups. The mice with S-180 implanted tumors were injected with the polysaccharide extracts at 24 mg/ kg body weight for 9 d and the tumorweight was measured on the 15th *** The mitosis index of hepatoma cells in vitro could be significantly decreased by treatment with the polysaccharide extracts fromthe three kinds of edible fungi (P numbers and mitoch.ndria activity of SMMC7721 cells treated with polysaccharide extracts were lower than those in control groups (P nhibition rates of polysaccharide extracts against implanted S-180 tumors in mice were 52.8%, 56.6% and 51 .9% respectivelycompared with that in c0ntrol ***0n The POIysaccharide extractsfrom the three kinds of edible fungi could inhibitnot only the Cultured malignant cells in vitfO butalso impIanted Sl80 tum0r i0 vivo.

关键词： polysaccharide, edible fungi liver neoplasm carcinoma, hepatocellular SMMC7721, tumor cell, cultured implanted tumor, S-180 cell proliferation

Structure-regulated fluorine-containing additives to improve the performance of perovskite solar cells

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nano Research 2024年第7期17卷 6080-6086页

作者： Peiya ch.n xiaoman Bi Hao Yan Yingjie zhao Yihao Liu zhuo Huang Qian xiao Yongpeng Yang Shasha zhang Yiqiang zhang Yanlin Song Henan Institute of Advanced Technology College of ChemistrySchool of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China Key Laboratory of Green Printing CAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of Sciences(ICCAS)Beijing Engineering Research Center of Nanomaterials for Green Printing TechnologyNational Laboratory for Molecular Sciences(BNLMS)Beijing 100190China

Perovskite solar cells(PSCs)have seen remarkable progress in recent years,largely attributed to various additives that enhance both efficiency and *** these,fluorine-containing additives have garnered significant interest because of their unique hydrophobic properties,effective defect passivation,and regulation capability on the crystallization ***,a targeted structural approach to design such additives is necessary to further enhance the performance of ***,fluoroalkyl ethylene with different fluoroalkyl chain lengths(ch_(2)ch(CF_(2))nCF_(3),n=3,5,and 7)as liquid additives is used to investigate influences of fluoroalkyl chain lengths on crystallization regulation and defect *** findings indicate that optimizing the quantity of F groups plays a crucial role in regulating the electron cloud distribution within the additive *** optimization fosters strong hydrogen bonds and coordination effects with FA+and uncoordinated Pb^(2+),ultimately enhancing crystal quality and device ***,1H,1H,2H-perfluoro-1-hexene(PF_(3))with the optimal number of F presents the most effective modulation effect.A PSC utilizing PF_(3)achieves an efficiency of 24.05%,and exhibits exceptional stability against humidity and thermal *** work sheds light on the importance of tailored structure designs in additives for achieving high-performance PSCs.

关键词： perovskite solar cells fluorine number additive structure crystallization regulation defect passivation

2001—2021年中国湿地碳汇研究进展与热点趋势分析

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湿地科学与管理 2024年第1期20卷 70-75页

作者：何苏南王凯郁凯孙果丽朱小梅陈环宇邢锦城乔干群卢明海江苏沿海地区农业科学研究所江苏盐城224000 江苏银宝控股集团有限公司江苏盐城224000

明确湿地碳汇研究进展对于寻找突破点和研究方向具有重要意义。利用CiteSpace软件对中国知网2001—2021年湿地碳含量研究的1183条文献进行了发文量、研究团队、研究机构、研究热点等的可视化分析,得出我国湿地碳汇研究特点和发展趋势。... 详细信息

明确湿地碳汇研究进展对于寻找突破点和研究方向具有重要意义。利用CiteSpace软件对中国知网2001—2021年湿地碳含量研究的1183条文献进行了发文量、研究团队、研究机构、研究热点等的可视化分析,得出我国湿地碳汇研究特点和发展趋势。结果表明:1)2005年后发文量显著增长,2017年达到顶峰后呈波动增加趋势;2)中科院东北地理与农业生态研究所、东北林业大学、北京师范大学是我国湿地碳汇研究的主要机构;3)我国湿地碳汇研究从湿地—气候变化的响应关系起步,发展到湿地土壤修复模式的探究,现阶段主要为碳中和背景下湿地固碳植物的选育与驯化;4)我国湿地碳汇研究稳步发展,但仍存在湿地碳汇计算综合评价体系缺乏、较少从湿地修复与保护双角度出发去考虑湿地碳库在“碳中和”中的相关影响问题。本研究指出了加强区域合作,结合本土化数据构建我国湿地碳汇参数库可能是未来研究的重要课题。

关键词：湿地碳汇 CiteSpace 可视化分析

全生命周期视角下甘南黄河水源补给区畜牧业碳足迹估算及时空格局分析

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草业学报 2024年第9期33卷 227-241页

作者：李晓榕陈强强甘肃农业大学财经学院甘肃兰州730070 甘肃省生态建设与环境保护研究中心甘肃兰州730030

客观认知畜牧业碳动态及其时空格局是夯实区域畜牧业低碳和生态化发展的科学基础。本研究基于2000-2020年甘南黄河水源补给区县域尺度的畜牧业生产投入数据,运用全生命周期法估算畜牧业碳足迹,揭示其时空变化和结构特征,应用空间自相关... 详细信息

客观认知畜牧业碳动态及其时空格局是夯实区域畜牧业低碳和生态化发展的科学基础。本研究基于2000-2020年甘南黄河水源补给区县域尺度的畜牧业生产投入数据,运用全生命周期法估算畜牧业碳足迹,揭示其时空变化和结构特征,应用空间自相关分析探讨畜牧业碳足迹的空间格局。结果表明:1)甘南黄河水源补给区畜牧业碳足迹整体呈上升态势,年均增长率为1.80%,且历经快速增长-缓慢下降后回升-波动下降3个时序变化阶段。2)产中环节的牲畜肠胃发酵和粪便管理环节产生的大量ch_(4)、n_(2)O是温室气体“俱乐部”,羊、牛的ch_(4)、n_(2)O排放量不断增加且远高于其他牲畜。3)玛曲县一直是畜牧业碳足迹的超重型区,重型区演化表现出波动态势,但主要集中于碌曲县和夏河县,临夏县、积石山县、和政县畜牧业碳足迹处于轻型,合作市、卓尼县、临潭县则处于中型排放;畜牧业碳足迹总量由大到小依次为牧区>农区>半农半牧区。4)补给区畜牧业碳足迹总体空间格局呈现“北冷南热”“西热东冷”的特征;县域尺度下,玛曲县、碌曲县是高碳集聚区,合作市、和政县、康乐县呈“低碳锁定”效应。因地制宜制订差异化的区域畜牧业发展策略,有助于推动减少畜牧业碳足迹数量以实现畜牧业低碳转型。

关键词：碳足迹温室气体全生命周期法畜牧业时空格局甘南黄河水源补给区

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富营养化咸水湖泊岱海温室气体排放特征及驱动因素分析

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环境科学 2024年第10期45卷 6157-6170页

作者：卢宗福史小红李国华内蒙古农业大学水利与土木建筑工程学院呼和浩特010018 内蒙古自治区水资源保护与利用重点实验室呼和浩特010018

为探究北方富营养化咸水湖泊温室气体排放特征及驱动因素,以内蒙古岱海为例,于2023年4月、7月和10月按水文分布特征选取10个监测点,采用顶空平衡气相色谱法和模型法测定岱海近岸带、开阔湖区和湖心区表层水体中二氧化碳(CO_(2))、甲烷(C... 详细信息

为探究北方富营养化咸水湖泊温室气体排放特征及驱动因素,以内蒙古岱海为例,于2023年4月、7月和10月按水文分布特征选取10个监测点,采用顶空平衡气相色谱法和模型法测定岱海近岸带、开阔湖区和湖心区表层水体中二氧化碳(CO_(2))、甲烷(ch_(4))和氧化亚氮(n_(2)O)的溶存浓度和水-气界面交换通量.研究期间,岱海温室气体浓度和通量季节变化显著;表层水体CO_(2)、ch_(4)和n_(2)O浓度平均值为(26.52±17.58)μmol·L^(-1)、(282.30±172.30)nmol·L^(-1)和(9.09±1.64)nmol·L^(-1),平均通量为(5.29±11.98)mmol·(m^(2)·d)^(-1)、(178.24±63.34)μmol·(m^(2)·d)^(-1)和(-0.74±1.28)μmol·(m^(2)·d)^(-1),累计排放量为50770.77、543.52和-4.21 kg·km^(-2),全球增温潜势[以CO_(2)当量(CO_(2)-eq)计]为50770.77、15218.49和-1254.48 kg·km^(-2).结果表明,岱海是大气CO_(2)和ch_(4)的源,是n_(2)O的汇.对温室气体与环境因子进行相关分析和逐步回归分析,发现影响岱海CO_(2)浓度和通量的环境因子为酸碱度(pH)和总溶解性固体(TDS);影响ch4浓度和通量的因子为水温(WT)、水深(WD)、风速(WS)、氧化还原电位(ORP)和总氮(Tn);影响n_(2)O浓度和通量的因子为WT、WS和Tn.此外,岱海自身的营养水平和盐度特性也是影响温室气体产生和排放的关键因素.

关键词：岱海营养水平咸水湖温室气体碳氮排放全球增温潜势(GWP)

内蒙古铁北煤矿褐煤的CO_(2)/ch_(4)/n_(2)竞争吸附微观特性研究

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煤炭转化 2024年第5期47卷 10-23页

作者：贾进章肖聆伊辽宁工程技术大学安全科学与工程学院辽宁阜新123000 辽宁工程技术大学矿山热动力灾害与防治教育部重点实验室辽宁葫芦岛125100

为研究煤对CO_(2),ch_(4)和n_(2)混合气体的竞争吸附特性及微观机理,以内蒙古铁北煤矿褐煤为研究对象,基于元素分析、固体^(13)C核磁共振光谱(^(13)C nMR)分析、傅立叶红外光谱(FTIR)分析、X射线光电子能谱(XPS)分析和X射线衍射(XRD)分... 详细信息

为研究煤对CO_(2),ch_(4)和n_(2)混合气体的竞争吸附特性及微观机理,以内蒙古铁北煤矿褐煤为研究对象,基于元素分析、固体^(13)C核磁共振光谱(^(13)C nMR)分析、傅立叶红外光谱(FTIR)分析、X射线光电子能谱(XPS)分析和X射线衍射(XRD)分析等实验分析结果构建了铁北煤矿褐煤大分子结构模型,并进行了CO_(2),ch_(4)和n_(2)在铁北煤矿褐煤分子结构模型中吸附行为的分子模拟以及不同体积比CO_(2)/ch_(4)和ch_(4)/n_(2)二元组分混合气体竞争吸附行为的分子模拟。结果表明:铁北煤矿褐煤的芳碳率为51.98%,芳香结构主要以苯和萘为主,氧元素存在于酚、醚、羰基和羧基中,含氮结构主要以吡咯和吡啶的形式存在,硫元素主要存在于噻吩硫中,芳烃取代方式主要为三取代形式,芳香桥碳与周碳的数量比X_(BP)为0.14。铁北煤矿褐煤大分子结构模型的分子式为C_(190)H_(200)O_(57)n_(2)。单组分气体CO_(2)/ch_(4)/n_(2)的吸附量和等量吸附热均随温度的升高而减小,温度升高对CO_(2)吸附量和等量吸附热的影响最大,对ch_(4)吸附量和等量吸附热的影响次之,对n_(2)吸附量和等量吸附热的影响最小。在CO_(2)/ch_(4)和ch_(4)/n_(2)混合气体中,单组分气体的分压越大,该气体吸附量越大。ch_(4)与CO_(2)的等量吸附热差值大于ch_(4)与n_(2)的等量吸附热差值。

关键词：煤分子模型竞争吸附吸附热分子模拟吸附量

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松辽盆地白垩系嫩江组煤系页岩孔隙结构及分形特征

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天然气地球科学 2024年第1期35卷 119-132页

作者：张吉振韩登林林伟王晨晨王建国肖肖李豫张晓婵长江大学油气地球化学与环境湖北省重点实验室湖北武汉430100 中国石化页岩油气勘探开发重点实验室北京100083 长江大学地球科学学院湖北武汉430100 临沂大学地质与古生物研究所山东临沂276000 长江大学非常规油气省部共建协同创新中心湖北武汉430100

页岩微观孔隙系统是气体赋存场所,孔隙结构精细刻画对于储层研究而言至关重要。页岩储层孔隙具有较强的复杂性和非均质性,而且煤系页岩孔隙发育特征研究显著滞后于海相页岩储层,亟需开展煤系页岩孔隙非均质性特征及其对含气性影响的深... 详细信息

页岩微观孔隙系统是气体赋存场所,孔隙结构精细刻画对于储层研究而言至关重要。页岩储层孔隙具有较强的复杂性和非均质性,而且煤系页岩孔隙发育特征研究显著滞后于海相页岩储层,亟需开展煤系页岩孔隙非均质性特征及其对含气性影响的深入研究。以松辽盆地松原地区白垩系嫩江组煤系页岩岩心为研究对象,通过开展全岩有机碳(TOC)和岩矿测定、孔隙度分析、低温n2吸附—脱附和ch4等温吸附实验,探讨了煤系页岩基质组分对孔隙结构和非均质性特征的影响,孔隙结构特征与分形特征的关系,以及孔隙结构和非均质性对甲烷吸附特征的影响。结果表明:①嫩江组页岩有机质丰度变化不显著(TOC平均含量为2.38%),多发育墨水瓶状孔;富含黏土矿物(平均含量为55.6%),多发育狭缝状孔隙;页岩孔隙表面具有明显的分形特性,分形维数D1和D2均值分别为2.54和2.74,内部结构较表面结构更为复杂。②有机碳的富集通过影响微小孔孔隙发育,增加比表面积使孔隙分形维数增大;黏土矿物发育致使介孔和宏孔数量增多,增加了孔隙的分形维数。③微小孔隙发育较大比表面积,增加了孔隙结构的复杂性和非均质性,促使分形特征显著,拓展了吸附点位,提升了吸附能力。相关研究将为煤系页岩储层综合评价、成藏理论研究提供科学理论依据。

关键词：煤系页岩孔隙结构分形特征松辽盆地白垩系嫩江组