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Realizing high initial Coulombic efficiency in manganese-based layered oxide cathodes for sodium-ion batteries via P2/O'3 biphasic structure optimization

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Rare Metals 2024年第5期43卷 2093-2102页

作者： Bo Peng Zi-Hao Zhou Ping Xuan Jie Xu Lian-Bo Ma School of Materials Science and Engineering Anhui University ofTechnologyMa'anshan 243002China anhui product quality supervision&inspection Research institute Hefei 230051China

Mn-based layered oxides are among the most promising cathode materials for sodium-ion batteries owing to the advantages of abundance,environmenta friendliness,low cost and high specific capacity.P2 and O'3 are two representative structures of Mn-based layered ***,the P2 structure containing insufficien Na generally exhibits low initial charge capacity,while O'3structure with sufficient Na delivers high initial charge capacity but poor cycle *** study prepared a multitude of Na_(x)MnO_(2)(x=0.7,0.8,0.9)cathode materials with varying P2/O'3 ratios and further investigated their electrochemical *** optimized Na_(0.8)MnO_(2) comprising 69.9 wt%O'3 and 30.1 wt%P2 phase,exhibited relatively balanced specific capacity,Coulombic efficiency and cycle ***,it achieved a high specific capacity of 128.9 mAh·g^(-1) with an initia Coulombic efficiency of 98.2%in half-cell configuration The Na_(0.8)MnO_(2)//hard carbon full cell also achieved a high specific capacity of 126.7 mAh·g^(-1) with an initia Coulombic efficiency of 98.9%.Moreover,the capacity fading mechanism was revealed by combining in-situ and ex-situ X-ray *** findings of this study provide theoretical guidance for further modification design of Mnbased layered cathodes.

关键词： Sodium-ion batteries Cathode materials Mn-based layered oxides P2/0'3 composites

Synthesis of comb bipolymers and their pour point depressing properties

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Petroleum Science 2014年第1期11卷 155-160页

作者： Zhang Changqiao Gao Congcong Gao Fengfeng Wang Jian Zhang Dawei Wang Yan Xu Dawei School of Chemistry and Chemical Engineering Shandong University Shandong quality Certification Centre Shandong product quality supervision & inspection Research institute

A bipolymer maleic anhydride-methyl acrylate （MAMA） was synthesized from maleic anhydride and methyl acrylate based on molecular *** further reacted with oleylamine or octadecyl alcohol to generate two comb polymers called Oleamide-MAMA （NMAMA） and OctadecanolMAMA （OMAMA）,*** structure of both the polymers was confirmed by their infrared spectral analysis （IR）,gel permeation chromatography analysis （GPC） and differential scanning calorimeter （DSC）.Moreover,the pour point depressing （PPD） properties of these comb polymers were examined *** results showed that besides the molecular weight and concentration of the polymers,the length of side chains and the number of functional groups also had great influence on the pour point depressing *** π bonds and hydrogen bonds between depressants were the key factors for improving the pour point depressing *** results suggest that both OMAMA and NMAMA are potential pour point depressants for industry.

关键词： Maleic anhydride comb polymers pour point depressant hydrogen bonds molecular simulation

Characterization and biodegradation kinetics of a new cold-adapted carbamazepine-degrading bacterium, Pseudomonas sp. CBZ-4

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Journal of Environmental Sciences 2013年第11期25卷 2281-2290页

作者： Ang Li Rui Cai Di Cui Tian Qiu Changlong Pang Jixian Yang Fang Ma Nanqi Ren State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology National supervision and inspection Center of Environmental Protection Equipment quality Yixing Urban Supervision andInspection Administration of Product Quality

Carbamazepine is frequently detected in waters and hardly eliminated during conventional wastewater treatment processes due to its complicated chemical structure and resistance to biodegradation. A carbamazepine-degrading bacterium named CBZ-4 was isolated at a low temperature （10℃） from activated sludge in a municipal wastewater treatment plant. Strain CBZ-4, which can use carbamazepine as its sole source of carbon and energy, was identified as Pseudomonas sp. by the 16S rRNA gene sequence. The composition and percentage of fatty acids, which can reveal the cold-adaptation mechanism of strain CBZ-4, were determined. Strain CBZ-4 can effectively degrade carbamazepine at optimal conditions： pH 7.0, 10℃, 150 r/min rotation speed, and 13% inoculation volume. The average removal rate of carbamazepine was 46.6% after 144 hr of incubation. The biodegradation kinetics of carbamazepine by CBZ-4 was fitted via the Monod model. Vmax and Ks were found to be 0.0094 hr^-1 and 32.5 mg/L, respectively.

关键词： carbamazepine low temperatures biodegradation kinetics Pseudomonas sp.

COMBINED EFFECT OF MODIFIED ZEOLITE 13X AND β-NUCLEATING AGENT ON IMPROVING β-CRYSTAL CONTENT AND TOUGHENING POLYPROPYLENE RANDOM COPOLYMER

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Chinese Journal of Polymer Science 2013年第11期31卷 1563-1578页

作者： Jin-hua Leng Heng Liu 何波兵 Bin Yang Xian Chen Qing-quan Qin Polymer Physics and Chemistry College of ChemistrySichuan University Chengdu product quality supervision and inspection institute Kaixian Chenjia Middle School

Although addition of β-nucleating agent directly into homo-polypropylene （PPH） is a useful method to improve ,β-crystal content and toughen PPH, polypropylene random copolymer （PPR） makes this method powerless due to its random structure and low crystallinity. In this study, the β-nucleated PPR with high β-crystal content was prepared by a novel high effective β-nucleating system which consists of β-nucleation agent （TMB-5） and modified zeolite 13X （M13X）. It was found that M13X and TMB-5 had a synergistic influence on improving β-crystal content and toughening PPR. The content of β-crystal in PPR/M13X/TMB-5 was significantly larger than the sum of that in PPR/M13X and PPR/TMB-5. Besides, fracture behavior, phase morphology and relaxation of matrix chain segments were also investigated. The results showed that M13X and TMB-5 improved the mobility of amorphous chain segments at low temperature and contributed to much energy dissipation. This work provides a powerful method to modify PPR.

关键词： Polypropylene random copolymer Zeolite fl-nucleating agent Crystallization Toughness.

Luminescence properties of BaAl_(12)O_(19):Tb,Ce and energy transfer between Ce^(3+),Tb^(3+)

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Journal of Rare Earths 2010年第S1期28卷 229-231页

作者：肖林久谢颖贺明睿陈永杰李文泽于维珂 Shenyang University of Chemical Technology Key Laboratory of Rare-Earth Chemistry and Applying Liaoning Province Shenyang supervision and inspection institute for product quality

Ba0.9-ySryAl12O19:Eu0.1 phosphors were prepared by sol-gel technique,the crystalline structures of samples characterized by XRD,and the luminescence properties were *** influence of crystallographic positions on the luminescent properties of Sr2+-doped BaAl12O19:Eu was investigated in *** results indicated that the crystal lattice of BaAl12O19:Eu was not influenced by the Sr2+ and doping Sr2+ in BaAl12O19:Eu enhanced the luminescent properties of the phosphors at the proper concentration of Sr2+.With the increasing of concentration of Sr2+ doped in BaAl12O19:Eu,the relative luminescent intensity of Ba0.9-ySryAl12O19:Eu0.1 strengthened and blue-shifted.

关键词： phosphors luminescence properties Sr2+ Eu2+ rare earths

Effects of Sr^(2+) on structure and luminescent properties of BaAl_(12)O_(19):Eu phosphors

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Journal of Rare Earths 2010年第S1期28卷 225-228页

作者：谢颖肖林久贺明睿陈永杰李文泽于维珂 Shenyang University of Chemical Technology Key Laboratory of Rare-Earth Chemistry and Applying Liaoning Province Shenyang supervision and inspection institute for product quality

BaAl12O19:Tb,Ce phosphors were prepared by sol-gel technique,the crystalline structures of samples characterized by XRD,and the luminescence properties and energy transfer between Ce3+ and Tb3+ were *** results indicated that the emission intensity and the excitation wavelength range of Tb3+ increased when Ce3+ was *** demonstrated that the Ce3+ added in the BaAl12O19:Tb could deliver energy to Tb3+,and Ce3+ was not luminous by *** relative emission intensity of Tb3+ at wavelength of 548 nm was the strongest by Tb3+/Ce3+ ratio of 2:1,when excited at 310 nm,which was the characteristic adsorption wavelength of Ce3+.

关键词： phosphors luminescence properties energy transfer Tb3+ Ce3+ rare earths

Applications of Mass Spectrometry in Textile Analysis: An Overview

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Journal of Analysis and Testing 2024年第4期8卷 518-537页

作者： Yudi Ruan Xianshuang Meng Jiangang Wang Hongwei Wang Qiong Ye Qianyi Shou Qiang Ma Chinese Academy of inspection and Quarantine Shaoxing Testing institute of quality and Technical supervision

Mass spectrometry (MS) stands as a pivotal tool for chemical analysis in the textile industry, capable of scrutinizing the vast majority of reported harmful chemicals. With the ever-increasing number of banned chemicals in textiles, there is a pressing need for a more systematic compilation of relevant literature on MS utilization to identify and quantify harmful substances in textiles. This article comprehensively reviews the role of MS in textile analysis over the past two decades, encompassing a wide range of sample preparation techniques, such as energy-assisted extraction, solid-phase microextraction, liquid-phase microextraction, and QuEChERS. Furthermore, it delves into MS techniques, such as gas chromatography–MS, liquid chromatography–MS, inductively coupled plasma–MS, ion mobility spectrometry–MS, and ambient ionization MS. Moreover, it offers a brief glimpse into the future of MS development in this field, highlighting ongoing research into additional sample preparation techniques for detecting hazardous chemicals in textiles. Notably, it underscores the growing interest in ambient ionization MS and the coupling of chromatography with high-resolution MS.

关键词： Harmful chemicals Mass spectrometry Sample preparation Textiles

Interaction Between Ustilaginoidea virens and Rice and Its Sustainable Control

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Rice science 2024年第3期31卷 269-284页

作者： ZHANG Fengmin CAO Zhenzhen ZHENG Xin HE Yuntao CHEN Mingxue LIN Xiaoyan Rice product quality inspection&supervision Testing Center of Ministry of Agriculture and Rural Affairs China National Rice Research InstituteHangzhou 310006China

Ustilaginoidea virens is a common rice pathogen that can easily lead to a decline in rice quality and the production of toxins pose potential risks to human *** this review,we present a comprehensive literature review of research since the discovery of rice false *** provide a comprehensive and,at times,critical overview of the main results and findings from related research,and propose future research ***,we delve into the interaction between *** and rice,including the regulation of transcription factors,the process of *** infecting rice panicles,and the plant immune response caused by rice *** that,we discuss the identification and characterization of mycotoxins produced by the pathogenic fungus,as well as strategies for disease *** emphasize the importance of comprehensive agricultural prevention and control methods for the sustainable management of *** knowledge will update our understanding of the interaction between *** and rice plants,offering a valuable perspective for those interested in ***.

关键词： rice false smut flower-specific infection mycotoxin food safety plant disease

Filtration assisted pretreatment for rapid enrichment and accurate detection of Salmonella in vegetables

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Food Science and Human Wellness 2023年第4期12卷 1167-1173页

作者： Bin Li Hanling Wang Jianguo Xu Wei Qu Li Yao Bangben Yao Chao Yan Wei Chen Engineering Research Center of Bio-Process Ministry of EducationSchool of Food and Biological EngineeringIntelligent Manufacturing InstituteHefei University of TechnologyHefei 230009China anhui Provincial institute of product quality supervision and inspection Hefei 230051China

Rapid detection of target foodborne pathogens plays more and more significant roles in food safety,which requires the efficiency,sensitivity,and *** this research,we proposed a new st rategy of isothermal-molecular-amplification integrated with lateral-flow-strip for rapid detection of Salmonella without traditional *** e designed syringe-assisted-filtration can contribute to simultaneous collection and concentration of target bacterium from vegetable samples in just 3 min,resolving the drawbacks of traditional random sampling *** simple and convenient ultrasonication,samples can be directly amplified at 39℃ in 25 min and the amplicons are qualitatively and quantitatively analyzed with the designed lateral-flow-strip in 5 ***,satisfied results have been achieved within 40 min,which greatly improve the efficiency while the accuracy is also ***,all detection steps can be completed under instrument-free *** method will hold great promise for target pathogen detection in the resource-limited district,or for emergency on-site identification.

关键词： Vegetables Salmonella Filtration enrichment Culture-free detection Enzymatic recombinase amplification(ERA) Lateral flow strip(LFS) Rapid detection Food safety