Main Group Chemistry最新文献_第7页

Parametric extraction and internal analysis of fullerene-based polymer bulk heterojunction solar cell 富勒烯基聚合物体异质结太阳能电池的参数提取及内部分析

IF 1.5 4区化学

Main Group Chemistry Pub Date : 2022-11-22 DOI: 10.3233/mgc-220038

Paritosh Chamola, P. Mittal

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Retraction notice regarding several articles published in Main Group Chemistry 关于在Main Group Chemistry上发表的几篇文章的撤稿通知

IF 1.5 4区化学

Main Group Chemistry Pub Date : 2022-10-28 DOI: 10.3233/mgc-220954

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Synthesis, characterization of dialkylated erythrosin B derivatives and their utility as a propitious anti-microbial agent 二烷基化红血素B衍生物的合成、表征及其抗菌作用

IF 1.5 4区化学

Main Group Chemistry Pub Date : 2022-05-04 DOI: 10.3233/mgc-220026

N. Sandhu, A. Singh, S. Pandey, V. Ghule, R. K. Tittal, R. Yadav, R. Shrivastava

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Aspergillus niger based lipase-tween 80 aggregates as interfacial activated biocatalyst for biodiesel production: Optimization using response surface methodology 以黑曲霉为基础的脂肪酶-吐温80聚集体作为生物柴油生产的界面活化生物催化剂:响应面法优化

IF 1.5 4区化学

Main Group Chemistry Pub Date : 2022-04-22 DOI: 10.3233/mgc-220010

Bahar Ghasemzadeh, Amir Abbas Matin, Mostafa Ebadi, Biuck Habibi

{"title":"Aspergillus niger based lipase-tween 80 aggregates as interfacial activated biocatalyst for biodiesel production: Optimization using response surface methodology","authors":"Bahar Ghasemzadeh, Amir Abbas Matin, Mostafa Ebadi, Biuck Habibi","doi":"10.3233/mgc-220010","DOIUrl":"https://doi.org/10.3233/mgc-220010","url":null,"abstract":"Biodiesel is a renewable energy source, which is produced through transesterification reactions. Despite great attention to develop enzymatic biodiesel production, there are serious obstacles to the industrial development of it such as its cost and slow reaction rate. Along with disadvantages, there are several advantages for enzymatic biodiesel production. Higher purity of fuel and glycerol is known as the most important achievement of enzymatic process. In this study, performance of four different fungi for lipase production was investigated and Aspergillus niger was selected as enzyme source. Lipase production were optimized using experimental design and the optimized factors were determined as pH 5, temperature 30 °C, Potato Dextrose Broth (PDB) 3 % w/v, olive oil 1.50 % v/v, with maximum lipase activity of 42.8±0.51 U/mg. In order to interfacial activation of the lipase, effect of surfactants was studied. Therefore, surfactant-enzyme aggregates were used as biocatalyst for transesterification reaction. Effects of factors on biodiesel yield were studied too. The yield was 96.41±1.20 % at the optimized conditions (methanol/oil molar ratio (5.50:1), enzyme concentration 19 % v/ w, Tween 80 concentration 19 mg L–\u00001, temperature 40 °C and reaction time 46 h).","PeriodicalId":18027,"journal":{"name":"Main Group Chemistry","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2022-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138508631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Silylation of piroxicam with some silylating reagents, and characterization of them to improve some properties of this drug 吡罗昔康与一些硅化试剂的硅化反应，并对其进行表征以改善该药物的某些性能

IF 1.5 4区化学

Main Group Chemistry Pub Date : 2022-04-20 DOI: 10.3233/mgc-220036

M. Galehassadi, Somayeh Jodeiri, E. Rezaii

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Study on the mechanism and thermodynamics of potassium leaching from phosphorus-potassium associated ore 磷钾伴生矿钾浸出机理及热力学研究

IF 1.5 4区化学

Main Group Chemistry Pub Date : 2022-04-20 DOI: 10.3233/mgc-210177

Yan Zhu, Liang Li, Quan Qi

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Theoretical study on the cycloaddition reaction of phosphenium cation and formaldehyde 磷酸阳离子与甲醛环加成反应的理论研究

IF 1.5 4区化学

Main Group Chemistry Pub Date : 2022-04-16 DOI: 10.3233/mgc-220037

Jiandong Sun, Xiaojun Tan, Huilian Xu, Xiujun Zhang, Yan He, Jinsong Gu

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Microstructural, surface and electrochemical properties of electrodeposited Ni-WC nanocomposites coatings Ni-WC纳米复合镀层的微观结构、表面和电化学性能

IF 1.5 4区化学

Main Group Chemistry Pub Date : 2022-04-11 DOI: 10.3233/mgc-210146

Lahag Lemya, B. Hachemi, Guettaf Temam Elhachmi

{"title":"Microstructural, surface and electrochemical properties of electrodeposited Ni-WC nanocomposites coatings","authors":"Lahag Lemya, B. Hachemi, Guettaf Temam Elhachmi","doi":"10.3233/mgc-210146","DOIUrl":"https://doi.org/10.3233/mgc-210146","url":null,"abstract":"In this work, we study the influences of nano-sized WC particles (diameter size of ∼50 nm), concentrations on the structure, surface morphology, mechanical and electrochemical properties of Ni-WC composite coatings electrodeposited on pretreated copper substrates. The corrosion behavior of Ni-WC composite coatings was studied by the potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) methods in two corrosion media (0.1 M HCl) and (3.5% NaCl). EDS analysis affirms that WC is the incorporated particles and nickel is the blinder metal. The incorporation of WC particles in the nickel matrix forms heterogeneous deposits that contain deep and narrow pores. XRD pattern indicates good crystal structure with (110), (111), (200) and (311) preferred growth orientations. The reinforcement of Ni matrix by nan-sized WC particles refines the grains size of the coatings. Microhardness and roughness of the deposits increase with the increase of WC concentration in the electrolyte bath. Based on the lowest corrosion density and the highest charge transfer resistance value, corrosion tests show that the samples 4 g/L and 1 g/L immersed in the corrosive media of 3.5% NaCl and 0.1 M HCl are the optimum conditions, respectively.","PeriodicalId":18027,"journal":{"name":"Main Group Chemistry","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2022-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85348269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

GC-MS analysis of Taraxacum officinale flowers and investigation of antimicrobial, anti-pellicle & anti-biofilm activities 蒲公英花的气相色谱-质谱分析及抗菌、抗膜、抗生物膜活性研究

IF 1.5 4区化学

Main Group Chemistry Pub Date : 2022-04-11 DOI: 10.3233/mgc-210133

Shumail Hoor, Tahira Hassan, Barkatullah, S. Khalid, N. Akhtar, A. Al-Qahtani, Afaf A Aldahish, T. Alqahtani, H. M. Alharbi, Reem M Gahtani

{"title":"GC-MS analysis of Taraxacum officinale flowers and investigation of antimicrobial, anti-pellicle & anti-biofilm activities","authors":"Shumail Hoor, Tahira Hassan, Barkatullah, S. Khalid, N. Akhtar, A. Al-Qahtani, Afaf A Aldahish, T. Alqahtani, H. M. Alharbi, Reem M Gahtani","doi":"10.3233/mgc-210133","DOIUrl":"https://doi.org/10.3233/mgc-210133","url":null,"abstract":"Plants synthesize large amount of useful and complex products which have no obvious metabolic and growth functions. These complex materials are said to be as secondary metabolites—phytochemicals which are plants active compounds possessing the potential to inhibit diseases. The purpose of the recent study was to investigate the pharmaceutical values of the flowers of Taraxacum officinale, for antimicrobial, anti-pellicle and anti-biofilm properties. Metanolic extracts with chloroform and n-hexane fractions against selected different bacterial (E.coli, P.aeruginosa, S.aureus, S.typhi) and fungal (F.oxysporum, A.niger, A.alternata, A.Terreus) strains were tested and GC-MS, FTIR and HPLC techniques, for detection of various secondary metabolites which are responsible for these activities, were performed. In antimicrobial assay, the result of the methanolic extract and fractions of the flowers was found to be effective against the tested bacterial and fungal strains. The GC-MS and FTIR analysis of chloroform fractions of T. officinale flowers reported the presence of a wide range of phytochemicals and secondery metabolites liable for the biological activities that can be purified in future for the synthesis of noval improved and valuable pharmaceutical products.","PeriodicalId":18027,"journal":{"name":"Main Group Chemistry","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2022-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82147424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Al2O3-coated LiNi0.8Co0.15Al0.05O2/ graphene composite as a high-performance cathode material for lithium-ion battery al2o3包覆LiNi0.8Co0.15Al0.05O2/石墨烯复合材料作为高性能锂离子电池正极材料

IF 1.5 4区化学

Main Group Chemistry Pub Date : 2022-04-08 DOI: 10.3233/mgc-220025

M. M. Loghavi, M. Babaiee, R. Eqra

{"title":"Al2O3-coated LiNi0.8Co0.15Al0.05O2/ graphene composite as a high-performance cathode material for lithium-ion battery","authors":"M. M. Loghavi, M. Babaiee, R. Eqra","doi":"10.3233/mgc-220025","DOIUrl":"https://doi.org/10.3233/mgc-220025","url":null,"abstract":"A cathode material composite containing Al2O3-coated LiNi0.8Co0.15Al0.05O2 (NCA) and graphene was prepared via a combination of ultrasonication and mechanical ball milling. No changes were observed in the crystalline structure of this material relative to the bare and Al2O3-coated LiNi0.8Co0.15Al0.05O2 materials based on the XRD spectrum. SEM images indicated that graphene was well distributed between the active material particles. The composite material was compared with the bare and Al2O3-coated active materials by electrochemical tests to evaluate its performance in the lithium-ion battery. The resistance values of the solid-electrolyte interphase layer and charge transfer were investigated during cycling by electrochemical impedance spectroscopy. The composite material provided the lowest resistance values with high stability during cycling. The capacity retention of the composite material was 27.7% more in comparison to the bare material during 50 cycles of charge/discharge at a 0.5C rate. Remarkably, the rate capability was improved by using the composite material, with a specific capacity of over 130.9 mAh g–1 at a 3C rate, which means delivering 62.9 mAh g–1 more capacity than the bare NCA. Graphene improved capacity retention and rate capability through the creation of a protective layer on the particles and providing a conductive medium in the electrode structure.","PeriodicalId":18027,"journal":{"name":"Main Group Chemistry","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2022-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81476404","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1