Monatshefte für Chemie / Chemical Monthly最新文献_第7页

Recent progress in the application of amidines for the synthesis of N-heterocyclic compounds 应用脒合成 N-杂环化合物的最新进展

Monatshefte für Chemie / Chemical Monthly Pub Date : 2024-03-06 DOI: 10.1007/s00706-024-03180-w

引用次数: 0

Green synthesis of MnO2 using Calendula officinalis and Tilia cordata extracts for application in supercapacitors 利用金盏花和椴树提取物绿色合成 MnO2 以应用于超级电容器

Monatshefte für Chemie / Chemical Monthly Pub Date : 2024-03-05 DOI: 10.1007/s00706-024-03179-3

Borislava Mladenova, Katya Pashova, Ivaylo Hinkov, Mariela Dimitrova, Antonia Stoyanova

引用次数: 0

Enhancing of methyl orange oxidation using nanotube sensor: analytical application in water 利用纳米管传感器增强甲基橙氧化：在水中的分析应用

Monatshefte für Chemie / Chemical Monthly Pub Date : 2024-03-05 DOI: 10.1007/s00706-024-03183-7

B. R. Krithi, J. G. Manjunatha, B. Kanthappa, Mika Sillanpaa, Sameh M. Osman

{"title":"Enhancing of methyl orange oxidation using nanotube sensor: analytical application in water","authors":"B. R. Krithi, J. G. Manjunatha, B. Kanthappa, Mika Sillanpaa, Sameh M. Osman","doi":"10.1007/s00706-024-03183-7","DOIUrl":"https://doi.org/10.1007/s00706-024-03183-7","url":null,"abstract":"<p>The electrochemical properties of poly(<span>l</span>-asparagine) modified carbon nanotube paste electrode (PAMCNPE) were investigated for precise detection of methyl orange. Asparagine was electrochemical polymerized and deposited onto the carbon nanotube paste surface to develop the modified electrode, and comparing to the bare carbon nanotube paste electrode. Cyclic voltammetry measurements of the modified electrode at pH 7 in a 0.2 M phosphate buffer saline showed excellent oxidizing activity towards methyl orange. Various factors were studied, including the ionic strength of the buffer. The external morphology and conversion of the perception material were studied using field emission scanning electron microscopy and electrochemical impedance spectroscopy, respectively. High sensitivity and selectivity for detecting methyl orange were also achieved by optimizing experimental conditions such of pH, concentration variation, and scan rate. The concentration range spanned from 0.2 to 9.0 µM, with the lower limit of detection at 1.368 × 10<sup>–7</sup> M and the quantification limit of 4.562 × 10<sup>–7</sup> M, indicating its excellent analytical performance. Additionally, the PAMCNPE shows good stability, reproducibility, and repeatability. Its remarkable recovery in real samples underscores its potential for practical applications in environmental and clinical analysis.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>","PeriodicalId":19011,"journal":{"name":"Monatshefte für Chemie / Chemical Monthly","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140036660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Lithium-ion (LCO/NMC, NMC, LFP) battery recycling: partial LCA study 锂离子（LCO/NMC、NMC、LFP）电池回收：部分生命周期评估研究

Monatshefte für Chemie / Chemical Monthly Pub Date : 2024-03-05 DOI: 10.1007/s00706-024-03184-6

Michael Fridrich, Anna Pražanová, Jan Weinzettel, Vaclav Knap

引用次数: 0

Detection of ammonia mercerization in cotton textiles 棉纺织品中氨丝光的检测

Monatshefte für Chemie / Chemical Monthly Pub Date : 2024-03-05 DOI: 10.1007/s00706-024-03181-9

{"title":"Detection of ammonia mercerization in cotton textiles","authors":"","doi":"10.1007/s00706-024-03181-9","DOIUrl":"https://doi.org/10.1007/s00706-024-03181-9","url":null,"abstract":"<h3>Abstract</h3> <p>Cotton textiles are mercerized with anhydrous ammonia liquefied at ca. − 33 °C to improve their mechanical performance, appearance, and handle. Similar effects may also be achieved with NaOH mercerization, but goods mercerized with liquid ammonia (L-NH<sub>3</sub>) are judged qualitatively better (e.g., softer hand) and thus command a greater price. Therefore, it is of interest to be able to test and confirm whether cotton textiles labeled as L-NH<sub>3</sub> treated are indeed so. Building on previous work, we report on tests in collaboration with a process house on identifying ammonia-mercerized fabrics from a pool of cotton textiles treated with L-NH<sub>3</sub>, NaOH, neither, or both––using FTIR-ATR spectroscopy. It is based on detecting the change in crystal lattice structure from type I (native cellulose) to type II (after NaOH mercerization) or type III (after ammonia mercerization). We could consistently differentiate the ammonia-mercerized fabrics from the untreated and those mercerized with NaOH, but the latter could not be differentiated from fabrics mercerized with both. It was also possible to detect evidence of ammonia mercerization in 4- and 14-year-old samples.</p> <span> <h3>Graphical abstract</h3> <p> <span> <span> <img alt=\"\" src=\"https://static-content.springer.com/image/MediaObjects/706_2024_3181_Figa_HTML.jpg\"/> </span> </span></p> </span>","PeriodicalId":19011,"journal":{"name":"Monatshefte für Chemie / Chemical Monthly","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140036194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impedance changes of the Li-ion cell in the course of discharge 锂离子电池在放电过程中的阻抗变化

Monatshefte für Chemie / Chemical Monthly Pub Date : 2024-03-05 DOI: 10.1007/s00706-024-03175-7

Petr Křivík

引用次数: 0

Comparative photoelectrochemical characteristics of heterostructure and composite based on BiVO4 and WO3 基于 BiVO4 和 WO3 的异质结构和复合材料的光电化学特性比较

Monatshefte für Chemie / Chemical Monthly Pub Date : 2024-02-27 DOI: 10.1007/s00706-023-03167-z

V. O. Smilyk, S. S. Fomanyuk, I. A. Rusetskyi, M. O. Danilov, G. Ya. Kolbasov

引用次数: 0

Hydrogen production with reduced energy consumption for use in fuel cells and energy sector 生产氢气，降低能耗，用于燃料电池和能源领域

Monatshefte für Chemie / Chemical Monthly Pub Date : 2024-02-26 DOI: 10.1007/s00706-023-03159-z

{"title":"Hydrogen production with reduced energy consumption for use in fuel cells and energy sector","authors":"","doi":"10.1007/s00706-023-03159-z","DOIUrl":"https://doi.org/10.1007/s00706-023-03159-z","url":null,"abstract":"<h3>Abstract</h3> <p>The possibility of increasing the hydrogen release rate and reducing energy consumption was analyzed using a system in which the anodic process of metal (aluminum) dissolution occurred on one electrode and the process of H<sub>2</sub> release on the other (nickel) electrode. The possibility of generating hydrogen with a current density of ~ 400 mA cm<sup>–2</sup> in NaOH solutions with a concentration of 6–8 mol dm<sup>–3</sup> at a cell voltage of ~ 0.5 V was confirmed. When the electrodes were short-circuited, hydrogen was generated on nickel when aluminum was dissolved at a rate corresponding to current density ~ 100 mA cm<sup>–2</sup>. The possibility of simultaneous hydrogen production and electricity generation in the system under consideration was shown. It was found that the maximum net power was generated in 6 mol dm<sup>–3</sup> NaOH. The specific power in such a solution can reach a value of 8 mW cm<sup>–2</sup> at a cell voltage of about 0.15 V. In this case, the hydrogen release rate corresponded to a current density of 60 mA cm<sup>–2</sup>.</p> <span> <h3>Graphical abstract</h3> <p> <span> <span> <img alt=\"\" src=\"https://static-content.springer.com/image/MediaObjects/706_2023_3159_Figa_HTML.png\"/> </span> </span></p> </span>","PeriodicalId":19011,"journal":{"name":"Monatshefte für Chemie / Chemical Monthly","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140007688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis of novel GABA-Triazole tethered derivatives of Noscapine and their anticancer activities 合成新型 GABA-三唑拴系的莨菪碱衍生物及其抗癌活性

Monatshefte für Chemie / Chemical Monthly Pub Date : 2024-02-24 DOI: 10.1007/s00706-024-03170-y

Farzaneh Karimi, Peyman Salehi, Morteza Bararjanian

引用次数: 0

Redox cationic frontal polymerization: a rapid curing approach for carbon fiber-reinforced composites with high fiber content 氧化还原阳离子正面聚合：高纤维含量碳纤维增强复合材料的快速固化方法

Monatshefte für Chemie / Chemical Monthly Pub Date : 2024-02-22 DOI: 10.1007/s00706-023-03168-y

{"title":"Redox cationic frontal polymerization: a rapid curing approach for carbon fiber-reinforced composites with high fiber content","authors":"","doi":"10.1007/s00706-023-03168-y","DOIUrl":"https://doi.org/10.1007/s00706-023-03168-y","url":null,"abstract":"<h3>Abstract</h3> <p>Conventional frontal polymerization processes for epoxy-based composites rely on cations and radicals generated by a short (and local) light or heat stimulus in the presence of an iodonium salt and a radical thermal initiator. However, due to heat losses, the propagation of the exothermic curing front is often limited by sample geometry and filler concentration. Redox cationic frontal polymerization (RCFP) is a promising approach to radically expand the composition and design options of frontally cured epoxy-based composites. By adding stannous octoate as reducing agent, a higher number of radicals and cations are generated at lower temperature, which yields highly cured composite even at elevated filler content. In the current study, RCFP was used to cure standard unidirectional carbon fiber-reinforced composites based on a commercially available epoxy resin and the properties were compared with its anhydride hardener-cured counterpart. Cure degree and thermal properties of the resins were determined by ATR FT-IR spectroscopy and DMA analysis. Subsequently, unidirectional composites with a fiber volume content of ~ 60% were produced via vacuum infusion and subjected to DMA, tensile, compression, and inter-laminar shear tests. The results showed a remarkable similarity between mechanical properties of RCFP and anhydride hardener-cured composites. The RCFP-cured composites exhibited even a higher damping resistance and compression strength than anhydride hardener-cured composites. The results show that RCFP allows for a significant reduction in the curing time (from several hours to 60 min), while it yields composites with properties comparable to classic anhydride-cured systems.</p> <span> <h3>Graphical abstract</h3> <p> <span> <span> <img alt=\"\" src=\"https://static-content.springer.com/image/MediaObjects/706_2023_3168_Figa_HTML.png\"/> </span> </span></p> </span>","PeriodicalId":19011,"journal":{"name":"Monatshefte für Chemie / Chemical Monthly","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139946667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0