Universal Journal of Carbon Research最新文献

Growth of Single-Walled Carbon Nanotubes from Solid Supported Heterogeneous Catalysts: Achievements and Challenges 利用固体支撑异质催化剂生长单壁碳纳米管：成就与挑战

Universal Journal of Carbon Research Pub Date : 2023-12-27 DOI: 10.37256/ujcr.1220233904

Qianru Wu, Ningning Xu, Xinyan Chi, Wenjing Zhang, Kezheng Chen, Maoshuai He

{"title":"Growth of Single-Walled Carbon Nanotubes from Solid Supported Heterogeneous Catalysts: Achievements and Challenges","authors":"Qianru Wu, Ningning Xu, Xinyan Chi, Wenjing Zhang, Kezheng Chen, Maoshuai He","doi":"10.37256/ujcr.1220233904","DOIUrl":"https://doi.org/10.37256/ujcr.1220233904","url":null,"abstract":"Single-walled carbon nanotubes (SWNTs) have gained worldwide attention because of their exceptional electronic, optical, and mechanical properties, which are contingent on their structures denoted by chiral indices (n, m). To fully harness the extraordinary properties and advance SWNT-based technology, large scale synthesis of SWNTs with a narrow chirality distribution or even a specific (n, m) is highly demanded. Among various SWNT preparation techniques, chemical vapor deposition growth from solid supported heterogeneous catalysts has emerged as a promising approach in terms of large yield and (n, m) structure control. In this review, we provide an overview of the progress in developing heterogeneous catalysts for bulk synthesis of SWNTs. Firstly, the advantages and disadvantages of using solid supported catalysts for chemical vapor deposition growth of SWNTs are discussed. Secondly, the key components in supported catalysts, including the metallic component and the nature of support material, as well as their respective roles in affecting the catalyst performances and SWNT chirality distribution, are highlighted. Finally, the current challenges and future directions in the field of SWNT synthesis from solid supported catalysts are proposed.","PeriodicalId":355701,"journal":{"name":"Universal Journal of Carbon Research","volume":"61 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139153638","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

Improving the mechanical performance of low graphene content epoxy nanocomposites: investigation of hybrid and chemically modified nanofillers 提高低石墨烯含量环氧纳米复合材料的机械性能：混合纳米填料和化学改性纳米填料的研究

Universal Journal of Carbon Research Pub Date : 2023-12-27 DOI: 10.37256/ujcr.1220233676

Daniel Belton, Marcin Orawiec, Richard Telford, Alexander Surtees

{"title":"Improving the mechanical performance of low graphene content epoxy nanocomposites: investigation of hybrid and chemically modified nanofillers","authors":"Daniel Belton, Marcin Orawiec, Richard Telford, Alexander Surtees","doi":"10.37256/ujcr.1220233676","DOIUrl":"https://doi.org/10.37256/ujcr.1220233676","url":null,"abstract":"Graphene is a promising nanofiller for producing polymer nanocomposites with enhanced mechanical, electrical, thermal, electromechanical, and flame retardancy properties, leading to applications in aerospace, automotive, ballistics, medicine, electronics, and smart materials. Solvent-assisted top-down methods, including mechanical exfoliation of graphite, show great potential for scale-up and mass production of graphene dispersions for use in the fabrication of nanocomposites. However, these approaches can suffer from poor efficiency, which limits the concentrations of graphene/polymer dispersions that can be produced using in situ methods. As such, it is important to find new ways of making more effective use of these low concentrations of graphene nanofillers. Possible approaches include chemical modification of the graphene or finding synergies with other nanofillers to form hybrid nanocomposites. In this work, we demonstrate results that make use of each approach. Specifically, we demonstrate a low-cost and simple method for producing carbon nanotube dispersions and creating hybrid nanocomposites with substantial enhancements to mechanical properties. We also extend the scope of our previously reported semi-in situ exfoliation method by demonstrating its application in the production of a nanocomposite that incorporates chemically modified graphene. The superior mechanical properties exhibited by the nanocomposite are attributed to increased interaction strength between the polymer and nanofiller.","PeriodicalId":355701,"journal":{"name":"Universal Journal of Carbon Research","volume":"122 16","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139154687","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

A bibliometric analysis on sustainable aviation fuels: core technologies, challenges and trends 关于可持续航空燃料的文献计量分析：核心技术、挑战和趋势

Universal Journal of Carbon Research Pub Date : 2023-12-27 DOI: 10.37256/ujcr.1220234147

Rafael Belo Duarte, Gabriela de França Lopes, João L. C. W. Pimenta, Luiz Mario de Matos Jorge

{"title":"A bibliometric analysis on sustainable aviation fuels: core technologies, challenges and trends","authors":"Rafael Belo Duarte, Gabriela de França Lopes, João L. C. W. Pimenta, Luiz Mario de Matos Jorge","doi":"10.37256/ujcr.1220234147","DOIUrl":"https://doi.org/10.37256/ujcr.1220234147","url":null,"abstract":"International initiatives such as the Carbon Offsetting and Reduction Scheme for International Aviation (CORSIA) have set goals for the complete de-carbonization of international aviation in this century. It motivated increasing numbers of Sustainable Aviation Fuel (SAF) research projects. The objective of this paper is to provide an overview on SAF research to point one to its foundations and recent advances. Data from the Web of Science database was collected and investigated. Important papers, cooperation networks, textual, productivity and trends analysis is provided. The most productive countries are in the global north, led by the United States and China. Big developing nations such as India and Brazil need to improve. The future of a sustainable aviation sector is heading in the direction of replacement of conventional jet fuel by synthetic hydrocarbon fuels by the end of the century. But there are still doubts about its viability both from the environmental and practical aspects, as there are concerns about feedstock availability and life cycle emissions. Fischer-Tropsch Synthesis, Alcohol-to-Jet and Hydroprocessing of Esters and Fatty Acids appear as the main SAF technologies for drop-in replacements. Longer term prospects are for the development of more efficient aircraft designed for renewables and non-hydrocarbon energy sources.","PeriodicalId":355701,"journal":{"name":"Universal Journal of Carbon Research","volume":"34 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139153308","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

Specific Power of Explosive and its Effect on Nanodiamonds 炸药的比功率及其对纳米金刚石的影响

Universal Journal of Carbon Research Pub Date : 2023-12-22 DOI: 10.37256/ujcr.1220233919

Valery Dolmatov

引用次数: 0

Influence of Doped Detonation Nanodiamonds on the Physical and Chemical Properties of Electrochemical Chromium Coatings 掺爆轰纳米金刚石对电化学铬镀层理化性能的影响

Universal Journal of Carbon Research Pub Date : 2023-10-11 DOI: 10.37256/ujcr.1220232731

Valerii Dolmatov, Galina Konstantinovna Burkat, Maxim Nikolaevich Kiselev

{"title":"Influence of Doped Detonation Nanodiamonds on the Physical and Chemical Properties of Electrochemical Chromium Coatings","authors":"Valerii Dolmatov, Galina Konstantinovna Burkat, Maxim Nikolaevich Kiselev","doi":"10.37256/ujcr.1220232731","DOIUrl":"https://doi.org/10.37256/ujcr.1220232731","url":null,"abstract":"Chromium deposition process regularities are analyzed in the standard chromium plating electrolytes, with and without detonation nanodiamonds additives modified with boron, phosphorus (DND-boron, phosphorus-DND) at a temperature of 50º to 55ºC while stirring the solution and without. It was studied by method of recording the partial polarization curves the concentration effect of additives DND-boron (in the range of 2,5 ÷ 10 g/l) on the kinetics of the chromate ion partial and full reducing. It has been shown that increasing the concentration of DND-boron leads to inhibition of the reaction Cr (VI) → Cr (III) and Cr polarization curves shift reaction (VI) → Cr (0) to a negative potential on the magnitude of 40-70 mV. While stirring the electrolyte chromium deposition occurs at more positive potentials than in quiescent electrolyte. Dependence of the electrode potential on the current density logarithm in all cases are linear with a slope close to 120 mV, indicating a limiting step of attaching the first electron. Mechanism of deposition of chrome in the presence of boron-DND does not change. Shiny, smooth, uniform coatings are deposited in electrolytes with DND-boron additives. Increased polarization in the chromium precipitation of electrolytes with DND-boron causes a change in precipitation structure, and as a consequence an increase in microhardness of chrome coatings from 955 kgf/mm2 for pure chromium to 1430 kgf/mm2 for chromium with embedded DND-boron nanodiamond particles. Wear resistance is increased: using DND-TAN - 2-3 times compared to standard chrome plating, using DND-phosphorus - in 3 times in comparison with DND-TAN, and using DCS (Si), doped silicon, wear is not detected (under the test conditions).","PeriodicalId":355701,"journal":{"name":"Universal Journal of Carbon Research","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136064037","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

Carbon accounting per unit of food and unit of land in food production systems of Argentina 阿根廷粮食生产系统中每单位粮食和每单位土地的碳核算

Universal Journal of Carbon Research Pub Date : 2023-10-08 DOI: 10.37256/ujcr.1220232202

Ernesto Viglizzo, Florencia Ricard

{"title":"Carbon accounting per unit of food and unit of land in food production systems of Argentina","authors":"Ernesto Viglizzo, Florencia Ricard","doi":"10.37256/ujcr.1220232202","DOIUrl":"https://doi.org/10.37256/ujcr.1220232202","url":null,"abstract":"Based on the notion of Life Cycle Assessment (LCA), the carbon footprint (CF) is an extensively used concept that quantifies and informs carbon load per unit weight (e.g., kg C/ton food) in the food system. In line with LCA, the CF computes emissions at pre-farm, farm and post-farm stages throughout a given food chain. However, the CF contribution to C accounting may sound incomplete because gains of C by photosynthesis at the farm stage are set aside. The notion of carbon balance (CB), which computes both C emission and capture (e.g., in ton C/ha), may be relevant in food production systems based on the extensive use of land. Because of the high weight that farm processes have on entire food chains, in this investigation we focused the analysis on the farm stage. In order to assess the suitability of CF and CB in extensive food production systems, we analyzed results from CF and CB in 70 surveyed commercial farms distributed across three large climatic regions (subtropical and temperate) of Argentina. The CF and CB of four relevant farming activities (beef, maize, soybean and wheat production) were compared during the year 2019. The comparison yielded contrasting results and opened space for different interpretations: The notion of CF seems to be useful in intensive food-production systems that rely on inputs and activities that depend on a high consumption of fossil fuels. Conversely, CB appears to be useful in food-production systems associated with an extensive use of land and the gain of C through a large plant-photosynthesis platform.","PeriodicalId":355701,"journal":{"name":"Universal Journal of Carbon Research","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135198061","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

Role of non-covalent interactions in 2,5-di-Me-pyrazine-di-N-oxide - tertiary butyl alcohol - single-walled and multi-walled carbon nanotubes electrocatalytic systems 非共价相互作用在2,5-二甲基吡嗪-二n-氧化物-叔丁醇-单壁和多壁碳纳米管电催化体系中的作用

Universal Journal of Carbon Research Pub Date : 2023-09-14 DOI: 10.37256/ujcr.1220233307

Svetlana Kulakovskaya, Tatyana S. Zyubina, Alexander S. Zyubin, Alexander V. Kulikov, Yuriy A. Dobrovolskiy

{"title":"Role of non-covalent interactions in 2,5-di-Me-pyrazine-di-N-oxide - tertiary butyl alcohol - single-walled and multi-walled carbon nanotubes electrocatalytic systems","authors":"Svetlana Kulakovskaya, Tatyana S. Zyubina, Alexander S. Zyubin, Alexander V. Kulikov, Yuriy A. Dobrovolskiy","doi":"10.37256/ujcr.1220233307","DOIUrl":"https://doi.org/10.37256/ujcr.1220233307","url":null,"abstract":"Oxidation of tert-butyl alcohol (tert-BuOH, Me3COH), a compound with a high C-H bond breaking energy in the absence of precious metals or their oxides as catalysts and using metal-free electrodes, is an inexpensive process and is of interest for practical applications in electrocatalysis and sensors. In this work, electrocatalytic systems 2,5-di-Me-pyrazine-di-N-oxide (Pyr1) - tert-BuOH – single - walled (SWCNT) and multi-walled (MWCNT) carbon nanotube paper electrodes in 0.1 M Bu4NClO4 solution in acetonitrile (MeCN) were studied by the methods of cyclic voltammetry, quantum chemical modeling and electron paramagnetic resonance (EPR) electrolysis. Calculaition of energies of non-covalent interactions between the components of the electrocatalytic system in complexes Me3COH*Me3COH, Me3COH*MeCN, Pyr1*Me3COH and the adsorption energy of Me3COH and complexes of Pyr1*Bu4NClO4, Pyr1*Me3COH, Pyr1*MeCN and Me3COH *Bu4NClO4 on CNTs surface using a cluster model describing the surface of conducting carbon nanotubes (10, 10) was performed. The study made it possible to reveal the regularities characteristic of aromatic-di-N-oxide – CNT electrocatalytic systems and to propose a mechanism of tert-BuOH oxidation in the presence of electrochemically generated radical cation Pyr1. The data will be useful at using CNT electrodes in electrocatalytic processes, as well as aromatic di-N-oxide-CNT catalytic systems in electrocatalysis and sensors.","PeriodicalId":355701,"journal":{"name":"Universal Journal of Carbon Research","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135551922","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

Graphene Oxide/Nanocrystalline Cellulose Composite: A Facile Phase Modulator 氧化石墨烯/纳米晶纤维素复合材料:一种简单的相位调制器

Universal Journal of Carbon Research Pub Date : 2023-06-07 DOI: 10.37256/ujcr.1120232216

Moses A. Ollengo

引用次数: 0

CO2/Brine/Rock Interactions in the Cedar Keys-Lawson Formation 西达礁-劳森地层中的二氧化碳/黄碱/岩石相互作用

Universal Journal of Carbon Research Pub Date : 2023-05-12 DOI: 10.37256/ujcr.1120232179

Yee Soong, Bret Howard, I. Haljasmaa, Dustin Crandall, R. Dilmore, Laura Dalton, Zhang Wu, Ping Wang, McMahan Gray, Fan Shi

{"title":"CO2/Brine/Rock Interactions in the Cedar Keys-Lawson Formation","authors":"Yee Soong, Bret Howard, I. Haljasmaa, Dustin Crandall, R. Dilmore, Laura Dalton, Zhang Wu, Ping Wang, McMahan Gray, Fan Shi","doi":"10.37256/ujcr.1120232179","DOIUrl":"https://doi.org/10.37256/ujcr.1120232179","url":null,"abstract":"It has been reported that among the various geologic storage options, deep saline aquifers have the largest estimated capacity for CO2 storage. Obtaining knowledge of possible artificially geochemically induced changes to the permeability and porosity of host CO2 storage deposits will enable us to gain insight on long-term reservoir behavior under CO2 storage conditions. \u0000An experimental study of the interaction of CO2/brine/rock on saline formations was conducted in a static system under CO2 storage conditions. Chemical interactions in the Cedar Keys-Lawson Formation carbonate during exposure to CO2 and brine under sequestration conditions were studied. Samples were exposed to the simulated in-situ reaction conditions for one and six months. The samples were exposed to a model brine at 55 °C and CO2 pressure of 23.8 MPa (3,500 psig). Computed tomography (CT), x-ray diffraction (XRD), scanning electron microscopy (SEM)-energy dispersive x-ray spectroscopy (EDS), brine composition, core porosity, and core permeability analyses were conducted prior to and after the exposure experiments.\u0000Preliminary permeability measurements obtained from the core samples showed changes after they were exposed to CO2-saturated brine for one and six months. This observation suggests that mineral dissolution and mineral precipitation could occur in the host deposit altering its characteristics for CO2 storage over time. The 3D images of the pore space clearly illustrate the degree of dissolution that occurred during exposure. It is noted that the dissolution that occurred during the six-month exposure could have enhanced the connectivity between voids. This may contribute the increase of permeability after the CO2/brine exposure. In addition, the primary minerals comprising the core are dolomite and gypsum. Both minerals could dissolve in the CO2/brine environment resulting in the increase of permeability after the six-month exposure. ","PeriodicalId":355701,"journal":{"name":"Universal Journal of Carbon Research","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127503245","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

Novel Ultrahard C6 with Mixed sp3-sp2 Hybridizations and Semiconducting Behavior: Crystal Chemistry and First Principles Investigations 具有混合sp3-sp2杂化和半导体行为的新型超硬C6:晶体化学和第一性原理研究

Universal Journal of Carbon Research Pub Date : 2023-05-09 DOI: 10.37256/ujcr.1120232219

Samir F. Matar

引用次数: 0