Revista de Chimie最新文献_第2页

Low-temperature Synthesis of Carbon Nanofibers/graphite Felt Composites Under Contactless Induction Heating 低温非接触感应加热合成纳米碳纤维/石墨毡复合材料

Revista de Chimie Pub Date : 2023-08-01 DOI: 10.37358/rc.23.3.8571

Cuong Duong‐Viet, Lai Truong-Phuoc, Thierry Romero, J. Nhut, L. Nguyen-Dinh, L. Vidal, C. Pham‐Huu

{"title":"Low-temperature Synthesis of Carbon Nanofibers/graphite Felt Composites Under Contactless Induction Heating","authors":"Cuong Duong‐Viet, Lai Truong-Phuoc, Thierry Romero, J. Nhut, L. Nguyen-Dinh, L. Vidal, C. Pham‐Huu","doi":"10.37358/rc.23.3.8571","DOIUrl":"https://doi.org/10.37358/rc.23.3.8571","url":null,"abstract":"\u0000In this report induction heating was used for the catalytic chemical vapor decomposition synthesis of carbon nanofibers (CNFs) on Ni-based catalyst. The CNFs were produced with a high yield at a relatively low temperature compared to that observed for conventional heating through convection and conduction. The process also occurred in the absence of secondary toxic organic compounds, formed through side reaction in the high temperature gas-phase or through decomposition on the hot wall of reactor as encountered with traditional Joule heating mode. The improved CNFs yield under induction heating was attributed to the high reaction temperature control thanks to the high temperature regulation rate provided by the induction heating coil. The local heating of the nickel nanoparticles by the electromagnetic field could also contribute to the improvement of the CNFs yield. The results obtained indicate that inductive heating mode could be of great interest for improving the heat transfer in catalytic processes and also to reduce the problem of gradient temperature occurring inside the catalyst bed during the operating of highly exothermic or endothermic processes. It is expected that such electricity-driven heating mode could have contributed in an efficient way toward the electrification of different catalytic processes in order to reduce the associated carbon footprint.\u0000","PeriodicalId":21296,"journal":{"name":"Revista de Chimie","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85393174","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

Modified Agricultural Waste for Copper Ions Adsorption 改性农业废弃物对铜离子的吸附

Revista de Chimie Pub Date : 2023-08-01 DOI: 10.37358/rc.23.3.8570

F. Abouzeid, Sultanah Alshammery

{"title":"Modified Agricultural Waste for Copper Ions Adsorption","authors":"F. Abouzeid, Sultanah Alshammery","doi":"10.37358/rc.23.3.8570","DOIUrl":"https://doi.org/10.37358/rc.23.3.8570","url":null,"abstract":"\u0000The present work represents potential bio-sorbents: Tilia cordata (little leaf linden) and Foeniculum vulgare (fennel). The copper removal was operated in batch procedure. Adsorbent mass, copper ion concentration, pH, time, and temperature considerations were inspected. The highly beneficial provisions for copper adsorption are 10 mg /L as preliminary concentration, 0.2 g as Tilia cordata and Foeniculum vulgare mass and pH 5.5 and 5.23 for Tilia cordata and Foeniculum vulgare. Adsorption statistics follow the Langmuir isotherm with qmax of 29.35 mg/g for Tilia cordata and 32.98 mg/g for Foeniculum vulgare. The removal procedure kinetics was provided perfectly via second-order equations. It was revealed that the copper ion adsorption procedure on mutual bio-sorbents is a spontaneous procedure, and is endothermal for Tilia cordata and Foeniculum vulgare. Characterization of Tilia cordata (little leaf linden) and Foeniculum (vulgare fennel) were inspected with a scanning electron microscope (SEM), Vis-IR Spectroscopy, GC-mass and milling cutter. A distinctive development in the adsorbent surface was exhibited through scanning electron microscope. The removal efficiency reached to 93.34 & 95.4 for Tilia (Tilia cordata) and Fennel (Foeniculum vulgare) respectively at 0.5 M bio-sorbent which indicated that Tilia (Tilia cordata) and Fennel (Foeniculum vulgare) has good renderability and stability.\u0000","PeriodicalId":21296,"journal":{"name":"Revista de Chimie","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86865205","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

Antioxidant Capacity Assays. Chemical and Cellular-based Methods 抗氧化能力测定。基于化学和细胞的方法

Revista de Chimie Pub Date : 2023-08-01 DOI: 10.37358/rc.23.3.8569

A. Danet, M. Cheregi, S. Lițescu

引用次数: 0

CONTENTS 3 / 2023 目录3 / 2023

Revista de Chimie Pub Date : 2023-08-01 DOI: 10.37358/rc.23.3.8568

引用次数: 0

ITSRepeats: Amino Acids Repeats and Composition Differences for Detecting Proteins Causing Bipolar Related Disorder ITSRepeats:用于检测引起双相相关障碍的蛋白质的氨基酸重复序列和组成差异

Revista de Chimie Pub Date : 2023-01-01 DOI: 10.37358/rc.23.1.8561

M. Muthupandi, Vairamuthu Thangaraj

引用次数: 0

Electrical Analysis of Ceiba Pentandra Oil as a Replacement for Mineral Oil in High Voltage Insulation Application 木棉油替代矿物油在高压绝缘中的电性分析

Revista de Chimie Pub Date : 2023-01-01 DOI: 10.37358/rc.23.1.8559

Arul Jose Johnsundarsingh, Sree Renga Raja Thangasa

{"title":"Electrical Analysis of Ceiba Pentandra Oil as a Replacement for Mineral Oil in High Voltage Insulation Application","authors":"Arul Jose Johnsundarsingh, Sree Renga Raja Thangasa","doi":"10.37358/rc.23.1.8559","DOIUrl":"https://doi.org/10.37358/rc.23.1.8559","url":null,"abstract":"\u0000The application of Ceiba Pentandra Oil is introduced as an alternative to the traditional non-biodegradable insulation oil. Through the recent research in vegetable based insulation oil (coconut oil, palm oil, and olive oil), it is identified that the vegetable insulation oil is biodegradable but edible in nature, which leads to the food crisis. To prevent the insufficiency of food, an interesting non-edible oil is extracted from the seeds of Ceiba Pentandra, which has the capability of biodegradation. This work has focused on the utilization of Ceiba Pentandra seeds for the production of vegetable based insulation oil since it is considered as the sustainable energy resource and. A two-step chemical conditioning method and antioxidants are used to produce the Processed Ceiba Pentandra oil (PCPO). Adding to that, the insulation behavior of Processed Ceiba Pentandra oil (PCPO) with and without antioxidant is analyzed. The different concentrations of PCPO and naphthalene based Mineral oil mixtures have been compared as per the ASTM standard. The two-step chemical conditioning method has provided the enhanced behavior of physical properties like Viscosity, Acidity, Flashpoint, Fire points and AC breakdown voltage. While improving the oxidation stability, the electrical property like AC Breakdown voltage has met the dielectric Standards. Thus this Processed Ceiba Pentandra oil (PCPO) has the potential to be an alternative of traditional insulation oil.\u0000","PeriodicalId":21296,"journal":{"name":"Revista de Chimie","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83440285","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

Preparation and Modification of Graphite-based and Coal-based Graphene and its Tribological Properties in Lubricants 石墨基和煤基石墨烯的制备、改性及其在润滑油中的摩擦学性能

Revista de Chimie Pub Date : 2023-01-01 DOI: 10.37358/rc.23.1.8563

Xu-wei Zhao, Kaibinuer Aierken, H. Maimaiti, Lirong Feng, Jianzhao Bao, Jin-yan Sun

{"title":"Preparation and Modification of Graphite-based and Coal-based Graphene and its Tribological Properties in Lubricants","authors":"Xu-wei Zhao, Kaibinuer Aierken, H. Maimaiti, Lirong Feng, Jianzhao Bao, Jin-yan Sun","doi":"10.37358/rc.23.1.8563","DOIUrl":"https://doi.org/10.37358/rc.23.1.8563","url":null,"abstract":"\u0000Graphite-based graphene oxide (GO) and coal-based graphene oxide (GO/SiO2, which we call graphene oxide/SiO2 because the surface of the resulting coal-based GO is linked with SiO2 from the coal structure) were prepared by the conventional Hummers oxidation method and ultrasound-assisted Hummers oxidation method, respectively, using natural graphite powder and Xinjiang Wucaiwan coal as carbon sources. Furthermore, the structures of the two were studied comparatively. Afterwards, the two lamellar structure products were hydrophilically modified with octadecylamine and dicyclohexylcarbodiimide by a hydrothermal method. And then, added these products (graphite-based GO-ODA and coal-based GO/SiO2-ODA) to No.32 cycloalkyl base oils in order to comparatively investigated their tribological properties as lubricant additives. The results showed that the dispersion stability of coal-based GO/SiO2 in the lubricant was significantly better than that of graphite-based GO; meanwhile, the tribological performance of GO/SiO2-ODA in the lubricant better than that of graphite-based GO-ODA due to the surface linkage of coal-based GO/SiO2 with SiO2 particles. After 1 h - long grinding in a four-ball friction test, the lubricant friction coefficient of 0.03 wt% coal-based GO/SiO2-ODA oil reached a minimum of 0.118, which reduced 58.1% compared to pure base oil and reduced 2.8 times compared to the counterpart using graphite-based GO-ODA under the same experimental conditions.\u0000","PeriodicalId":21296,"journal":{"name":"Revista de Chimie","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84088432","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

Comprehensive Review of Magnetic Polymeric Nanocomposites with Superparamagnetic Iron Oxide Nanoparticles for Oil Removal from Water 超顺磁性氧化铁纳米磁性聚合物复合材料水中除油研究综述

Revista de Chimie Pub Date : 2023-01-01 DOI: 10.37358/rc.23.1.8562

M. S. Mendes, Lorena Celeste De Souza Coutinho, Ayla Bastos Araujo, M. A. F. S. Neves, M. S. Pedrosa

{"title":"Comprehensive Review of Magnetic Polymeric Nanocomposites with Superparamagnetic Iron Oxide Nanoparticles for Oil Removal from Water","authors":"M. S. Mendes, Lorena Celeste De Souza Coutinho, Ayla Bastos Araujo, M. A. F. S. Neves, M. S. Pedrosa","doi":"10.37358/rc.23.1.8562","DOIUrl":"https://doi.org/10.37358/rc.23.1.8562","url":null,"abstract":"\u0000Several oil spills in aquatic environments have been reported over the last few years, and a great effort has been made to develop new techniques for collecting and removing oil from water on a large scale to prevent environmental pollution by this contaminant. In view of the various problems involving traditional methods, such as the generation of secondary pollution, high costs and complexity of synthesizing material and expenses to transport equipment, among others, new technologies have been developed for removal of oil from water. Among these, the use of magnetic polymeric nano-composites has presented promising results, since they have high oil adsorption efficiency, ease of material removal through an external magnetic field, low cost of synthesis and possibility of reusing the material for several cycles, among others. However, a lack of studies about these promising systems exists regarding this technology and its procedures. Therefore, here we present a brief bibliographic review of the synthesis routes to obtain magnetic polymeric nanocomposites containing superpara-magnetic iron oxide nanoparticles developed for oil removal from water and report future trends and perspectives for progress of this technology.\u0000","PeriodicalId":21296,"journal":{"name":"Revista de Chimie","volume":"259 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77105747","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

Reclamation of Aged Oil Using Physical-Chemical Method and Analysed Using ANFIS Algorithm 利用物化法回收老化油，并用ANFIS算法进行分析

Revista de Chimie Pub Date : 2023-01-01 DOI: 10.37358/rc.23.1.8560

Godfrey Bhonz Manoharan, Sree Renga Raja Thangasamy

{"title":"Reclamation of Aged Oil Using Physical-Chemical Method and Analysed Using ANFIS Algorithm","authors":"Godfrey Bhonz Manoharan, Sree Renga Raja Thangasamy","doi":"10.37358/rc.23.1.8560","DOIUrl":"https://doi.org/10.37358/rc.23.1.8560","url":null,"abstract":"\u0000In this work, the transformer oil reclamation experimental test has been created utilising the physical-chemical reclamation technique and oil lifespan analysis using ANFIS algorithm. The significant of work is that it develops an ANFIS algorithm for estimating transformer life and analyzing transformer oil reliability. Rubber seed oil (mineral oil) is used in transformers to cool the substantial portion of the power transformer and decrease electrical ageing issues. These mineral oils interact chemically with the windings, suffering electrical and mechanical pressure owing to high temperatures over its power balance which leads to moisture and oxidation. In order to improve the performance of ageing oil, a physical and chemical reclamation approach with two primary steps, Coagulation and Adsorption, is used. Breakdown voltage, flash point, viscosity, and fire point are the important dielectric qualities of oil reclamation that will differentiate the performance between before and after reclamation when compared to diverse oil samples. The results of the work revealed that the physical-chemical reclamation process is enhanced the dielectric characteristics of the ageing oil, and the parameters of the reclaimed oil are utilised to predict the projected lifespan of the transformer service.\u0000","PeriodicalId":21296,"journal":{"name":"Revista de Chimie","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88176109","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

Transport of Particulate Matter Due to Meteorological Changes Analyzed by HYSPLIT 利用HYSPLIT分析气象变化引起的颗粒物输运

Revista de Chimie Pub Date : 2022-10-31 DOI: 10.37358/rc.22.4.8542

M. Krishnan, Padmanabhan Krishnaswami, Muthu Ram Pazhani Selvam, Vinnarasi Anthony Dass, Ragu Thangavel, S. Subramanian

{"title":"Transport of Particulate Matter Due to Meteorological Changes Analyzed by HYSPLIT","authors":"M. Krishnan, Padmanabhan Krishnaswami, Muthu Ram Pazhani Selvam, Vinnarasi Anthony Dass, Ragu Thangavel, S. Subramanian","doi":"10.37358/rc.22.4.8542","DOIUrl":"https://doi.org/10.37358/rc.22.4.8542","url":null,"abstract":"\u0000The air quality in the urban region varies based on the sources of air pollution from regions near and far. Any pollution produced in the urban region affects the locality near the pollution source and also adjacent distant regions. The study of the interaction between the local weather patterns of a region and the pollutants in the air is needed for air quality management. It is explicit that Chennai city has a high level of air pollution. But the unavailability of the relevant data on the air pollution sources makes the management difficult. If the data on air pollution in the region of Chennai is known, it will be helpful to provide control measures. Between January 2017 and December 2017, the particulate matter below the size of 2.5 micron (PM2.5) was assessed. It was quite concentrated in the metropolitan city of Chennai situated at the shores of the Bay of Bengal. This assessment is to study the transport phenomenon and expansion of the pollutant particles initially emanating from Chennai. This occurs mainly due to the westerly winds originating in the Bay of Bengal. The time duration of the analysis showed an average PM2.5 concentration of 63.524 � 18.942 �g/m3. This far exceeds the regulations of the World Health Organization (WHO). Various regions of the country as affected by different distant sources of pollution in and around Chennai were evaluated by the trajectory modeling. The pollution in the regions of the vicinity is assessed using the Hybrid Single-Particle Lagrangian Integrated Approach (HYSPLIT) software. The method and results are fruitful for similar estimates elsewhere.\u0000","PeriodicalId":21296,"journal":{"name":"Revista de Chimie","volume":"163 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84092752","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