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Artykuły w czasopismach na temat „Carbonaceous nanostructures”

Autor: Grafiati

Data publikacji: 6 września 2023

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1

Mansoori Mosleh, Fazel, Yadollah Mortazavi, Negahdar Hosseinpour i Abbas Ali Khodadadi. "Asphaltene Adsorption onto Carbonaceous Nanostructures". Energy & Fuels 34, nr 1 (5.12.2019): 211–24. http://dx.doi.org/10.1021/acs.energyfuels.9b03466.

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YU, M. S., S. Y. CHENG, Y. C. LIN i W. C. HO. "ELECTROCHEMICAL STORAGE OF HYDROGEN IN CARBON NANOSTRUCTURES". International Journal of Nanoscience 02, nr 04n05 (sierpień 2003): 307–17. http://dx.doi.org/10.1142/s0219581x03001334.

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We have synthesized a set of nanostructured carbon samples including a variety of carbon nanotubes and carbonaceous particles, by catalytic thermal decomposition of CH4 on catalyst LaNi 5 powder with different reaction temperatures. Products obtained at reaction temperatures 550~900°C were characterized by means of HR-TEM, SEM and Raman Scattering. In addition, electrochemical charge–discharge cycling method was carried out at room temperature to measure the reversible hydrogen capacity in pressed electrodes containing mixture of catalyst, nanostructured carbon samples and carbonaceous particles. Results showed that the abundance ratio of well-crystallized graphite to amorphous carbon in each product increases with increasing reaction temperatures. This preliminary study showed also that the hydrogen storage capacity of synthesis products measured in an electrochemical half-cell at room temperature correlates with the nanostructure and morphology of the variety of nanostructured carbon samples. Additionally, the hydrogen adsorption capacity against specific surface area (BET) for synthesis products produced at temperatures higher than 670°C is ranging from 14 to 25 wt.%/(1000 m2/g).

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3

Mandal, Santi M., Tridib K. Sinha, Ajit K. Katiyar, Subhayan Das, Mahitosh Mandal i Sudipto Ghosh. "Existence of Carbon Nanodots in Human Blood". Journal of Nanoscience and Nanotechnology 19, nr 11 (1.11.2019): 6961–64. http://dx.doi.org/10.1166/jnn.2019.16628.

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Presence of carbon nanostructures (dots of 2–3 nm of diameter) in human blood plasma have been identified for the first time. The observed particles are N-doped carbon dots having surface active oxygen functional groups. This functionalized carbonaceous nanostructure may have been originated through catabolic processes of consumed foods and beverages. It may take part in different catalytic activities of biomolecules in cellular system necessary for normal physiological function which is unexplored yet.

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4

FANG, HUI-CHEN, YUN-SHUO HSIEH, YOU-MING TSAU, HSIU-FUNG CHENG i I.-NAN LIN. "SYNTHESIS OF NANOSTRUCTURE CARBONACEOUS MATERIALS ON TIP USING PLASMA-CHEMICAL-VAPOR-DEPOSITION METHOD". International Journal of Nanoscience 02, nr 04n05 (sierpień 2003): 231–37. http://dx.doi.org/10.1142/s0219581x03001243.

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Phase transformation of carbonaceous species under the action of high intensity plasma was studied by using a specially designed setup in which a Fe-needle was used as an antenna to absorb microwave and to induce local plasma in the vicinity of needle-tip. Using such a setup, carbon nanotubes have been successfully synthesized on the needle using diamond powder as carbon source and organic iron as catalyst. Variety of nano-structure carbonaceous materials were observed besides carbon nanotubes, e.g., diamond recrystallized as starfruit shaped geometry. Moreover, there exist other kinds of unknown nanostructures on the needle substrate. Some are long, thin, smooth, and some are planar. The characteristics of these unique nanostructured materials will be systematically investigated and the possible growth mechanism will be discussed.

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5

Barra, Ana, Cláudia Nunes, Eduardo Ruiz-Hitzky i Paula Ferreira. "Green Carbon Nanostructures for Functional Composite Materials". International Journal of Molecular Sciences 23, nr 3 (6.02.2022): 1848. http://dx.doi.org/10.3390/ijms23031848.

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Carbon nanostructures are widely used as fillers to tailor the mechanical, thermal, barrier, and electrical properties of polymeric matrices employed for a wide range of applications. Reduced graphene oxide (rGO), a carbon nanostructure from the graphene derivatives family, has been incorporated in composite materials due to its remarkable electrical conductivity, mechanical strength capacity, and low cost. Graphene oxide (GO) is typically synthesized by the improved Hummers’ method and then chemically reduced to obtain rGO. However, the chemical reduction commonly uses toxic reducing agents, such as hydrazine, being environmentally unfriendly and limiting the final application of composites. Therefore, green chemical reducing agents and synthesis methods of carbon nanostructures should be employed. This paper reviews the state of the art regarding the green chemical reduction of graphene oxide reported in the last 3 years. Moreover, alternative graphitic nanostructures, such as carbons derived from biomass and carbon nanostructures supported on clays, are pointed as eco-friendly and sustainable carbonaceous additives to engineering polymer properties in composites. Finally, the application of these carbon nanostructures in polymer composites is briefly overviewed.

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6

Khanchuk, A. I., V. P. Molchanov, M. A. Medkov, P. S. Gordienko i V. A. Dostavalov. "Synthesis of carbonaceous nanostructures from natural graphite". Doklady Earth Sciences 452, nr 1 (wrzesień 2013): 942–44. http://dx.doi.org/10.1134/s1028334x13090110.

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7

Kumar, Rajeev, Harish Kumar Choudhary, A. V. Anupama, Aishwarya V. Menon, Shital P. Pawar, Suryasarathi Bose i Balaram Sahoo. "Nitrogen doping as a fundamental way to enhance the EMI shielding behavior of cobalt particle-embedded carbonaceous nanostructures". New Journal of Chemistry 43, nr 14 (2019): 5568–80. http://dx.doi.org/10.1039/c9nj00639g.

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8

Ghiurea, Marius, Stefan-Ovidiu Dima, Anca-Andreea Turcanu, Radu-Claudiu Fierascu, Cristian-Andi Nicolae, Bogdan Trica i Florin Oancea. "Carbonaceous Nanostructures Obtained by Hydrothermal Conversion of Biomass". Proceedings 29, nr 1 (15.10.2019): 56. http://dx.doi.org/10.3390/proceedings2019029056.

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9

Kumar, Sanjay, Suneel Kumar, Manisha Sengar i Pratibha Kumari. "Gold-carbonaceous materials based heterostructures for gas sensing applications". RSC Advances 11, nr 23 (2021): 13674–99. http://dx.doi.org/10.1039/d1ra00361e.

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10

Necolau, Mădălina-Ioana, i Andreea-Mădălina Pandele. "Recent Advances in Graphene Oxide-Based Anticorrosive Coatings: An Overview". Coatings 10, nr 12 (25.11.2020): 1149. http://dx.doi.org/10.3390/coatings10121149.

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The present review outlines the most recent advance in the field of anticorrosive coatings based on graphene oxide nanostructures as active filler. This carbonaceous material was extensively used in the last few years due to its remarkable assets and proved to have a significant contribution to composite materials. Concerning the graphene-based coatings, the synthesis methods, protective function, anticorrosion mechanism, feasible problems, and some methods to improve the overall properties were highlighted. Regarding the contribution of the nanostructure used to improve the capability of the material, several modification strategies for graphene oxide along with the synergistic effect exhibited when functionalized with other compounds were mainly discussed.

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11

Rozel, Petr, Darya Radziuk, Lubov Mikhnavets, Evgenij Khokhlov, Vladimir Shiripov, Iva Matolínová, Vladimír Matolín, Alexander Basaev, Nikolay Kargin i Vladimir Labunov. "Properties of Nitrogen/Silicon Doped Vertically Oriented Graphene Produced by ICP CVD Roll-to-Roll Technology". Coatings 9, nr 1 (19.01.2019): 60. http://dx.doi.org/10.3390/coatings9010060.

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Simultaneous mass production of high quality vertically oriented graphene nanostructures and doping them by using an inductively coupled plasma chemical vapor deposition (ICP CVD) is a technological problem because little is understood about their growth mechanism over enlarged surfaces. We introduce a new method that combines the ICP CVD with roll-to-roll technology to enable the in-situ preparation of vertically oriented graphene by using propane as a precursor gas and nitrogen or silicon as dopants. This new technology enables preparation of vertically oriented graphene with distinct morphology and composition on a moving copper foil substrate at a lower cost. The technological parameters such as deposition time (1–30 min), gas partial pressure, composition of the gas mixture (propane, argon, nitrogen or silane), heating treatment (1–60 min) and temperature (350–500 °C) were varied to reveal the nanostructure growth, the evolution of its morphology and heteroatom’s intercalation by nitrogen or silicon. Unique nanostructures were examined by FE-SEM microscopy, Raman spectroscopy and energy dispersive X-Ray scattering techniques. The undoped and nitrogen- or silicon-doped nanostructures can be prepared with the full area coverage of the copper substrate on industrially manufactured surface defects. Longer deposition time (30 min, 450 °C) causes carbon amorphization and an increased fraction of sp3-hybridized carbon, leading to enlargement of vertically oriented carbonaceous nanostructures and growth of pillars.

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12

Li, Weihan, Minsi Li, Keegan R. Adair, Xueliang Sun i Yan Yu. "Carbon nanofiber-based nanostructures for lithium-ion and sodium-ion batteries". Journal of Materials Chemistry A 5, nr 27 (2017): 13882–906. http://dx.doi.org/10.1039/c7ta02153d.

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Carbon nanofibers (CNFs) belong to a class of one-dimensional (1D) carbonaceous materials with excellent electronic conductivity, leading to their use as conductive additives in electrode materials for lithium-ion batteries (LIBs) and sodium-ion batteries (NIBs).

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13

Jin, Hanfeng, Lili Ye, Jiuzhong Yang, Yu Jiang, Long Zhao i Aamir Farooq. "Inception of Carbonaceous Nanostructures via Hydrogen-Abstraction Phenylacetylene-Addition Mechanism". Journal of the American Chemical Society 143, nr 49 (16.11.2021): 20710–16. http://dx.doi.org/10.1021/jacs.1c08230.

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14

Kubo, Shiori, Irene Tan, Robin J. White, Markus Antonietti i Maria-Magdalena Titirici. "Template Synthesis of Carbonaceous Tubular Nanostructures with Tunable Surface Properties". Chemistry of Materials 22, nr 24 (28.12.2010): 6590–97. http://dx.doi.org/10.1021/cm102556h.

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15

Byeon, Jeong Hoon, i Jang-Woo Kim. "Production of carbonaceous nanostructures from a silver-carbon ambient spark". Applied Physics Letters 96, nr 15 (12.04.2010): 153102. http://dx.doi.org/10.1063/1.3396188.

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16

Liu, Lei, Chang-Ce Ke, Tian-Yi Ma i Yun-Pei Zhu. "When Carbon Meets CO2: Functional Carbon Nanostructures for CO2 Utilization". Journal of Nanoscience and Nanotechnology 19, nr 6 (1.06.2019): 3148–61. http://dx.doi.org/10.1166/jnn.2019.16590.

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Major fossil fuel consumption associated with CO2 emission and socioeconomic instability has received much concern within the global community regarding the long-term sustainability and security of these commodities. The capture, sequestration, and conversion of CO2 emissions from flue gas are now becoming familiar worldwide. Nanostructured carbonaceous materials with designed functionality have been extensively used in some key CO2 exploitation processes and techniques, because of their excellent electrical conductivity, chemical/mechanical stability, adjustable chemical compositions, and abundant active sites. This review focuses on a variety of carbonaceous materials, like graphene, carbon nanotubes, amorphous porous carbons and carbon hybrid composites, which have been demonstrated promising in CO2 capture/separation and conversion (electrocatalysis and photocatalysis) to produce value-added chemicals and fuels. Along with the discussion and concerning synthesis strategies, characterization and conversion and capture/separation techniques employed, we further elaborate the structure-performance relationships in terms of elucidating active sites, reaction mechanisms and kinetics improvement. Finally, challenges and future perspectives of these carbon-based materials for CO2 applications using well-structured carbons are remarked in detail.

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17

Utke, Ivo, Johann Michler, Robert Winkler i Harald Plank. "Mechanical Properties of 3D Nanostructures Obtained by Focused Electron/Ion Beam-Induced Deposition: A Review". Micromachines 11, nr 4 (10.04.2020): 397. http://dx.doi.org/10.3390/mi11040397.

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This article reviews the state-of-the -art of mechanical material properties and measurement methods of nanostructures obtained by two nanoscale additive manufacturing methods: gas-assisted focused electron and focused ion beam-induced deposition using volatile organic and organometallic precursors. Gas-assisted focused electron and ion beam-induced deposition-based additive manufacturing technologies enable the direct-write fabrication of complex 3D nanostructures with feature dimensions below 50 nm, pore-free and nanometer-smooth high-fidelity surfaces, and an increasing flexibility in choice of materials via novel precursors. We discuss the principles, possibilities, and literature proven examples related to the mechanical properties of such 3D nanoobjects. Most materials fabricated via these approaches reveal a metal matrix composition with metallic nanograins embedded in a carbonaceous matrix. By that, specific material functionalities, such as magnetic, electrical, or optical can be largely independently tuned with respect to mechanical properties governed mostly by the matrix. The carbonaceous matrix can be precisely tuned via electron and/or ion beam irradiation with respect to the carbon network, carbon hybridization, and volatile element content and thus take mechanical properties ranging from polymeric-like over amorphous-like toward diamond-like behavior. Such metal matrix nanostructures open up entirely new applications, which exploit their full potential in combination with the unique 3D additive manufacturing capabilities at the nanoscale.

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18

Liu, Xuyan, Jiahuan Zeng, Huinan Yang, Kai Zhou i Deng Pan. "V2O5-Based nanomaterials: synthesis and their applications". RSC Advances 8, nr 8 (2018): 4014–31. http://dx.doi.org/10.1039/c7ra12523b.

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Comprehensive depiction the phase-pure V₂O₅ with unique 1D, 2D, and 3D nanostructures. Illustrate the development of carbonaceous materials into the V₂O₅ electrodes. Introduce the cation doped V₂O₅ samples as the cathode material.

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19

Fracari, Tiago, Sandra Einloft i Vladimir Lavayen. "Thermal Behavior and Spectroscopy Analysis of Carbonized Nanostructures Derived from Polypyrrole Nanotubes". International Journal of Nanoscience 16, nr 05n06 (11.08.2017): 1750014. http://dx.doi.org/10.1142/s0219581x17500144.

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Carbonaceous nanotubes with a calculated specific heat of 710[Formula: see text]J K[Formula: see text] Kg[Formula: see text], and an outer diameter of 58[Formula: see text]nm, made by a micro-thermal reaction, using polypyrrole nanotubes precursor is presented here. Three degradation stages from the thermal curves are identified. We observe a decomposition temperature at 371[Formula: see text]C that relates to the presence of amorphous carbon on samples for the first time in this material. Also, it is identified that gradual decomposition of the fragments provides a different kind of residue percentage in the range 48–32% that is related to stirring speed used in each synthesis. It is worthy to note that electron transmission microscope images of carbonaceous nanotubes present defects as well, wherein we identify chloride and nitrogen as doped agents. Finally, results of nanotubes using Infrared, Raman spectrometry analysis, scanning electron microscopy and electron diffraction are presented here.

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20

Kawaguchi, Masayuki. "Preparation, nanostructures and properties of carbonaceous materials containing boron and nitrogen". TANSO 2007, nr 227 (2007): 107–14. http://dx.doi.org/10.7209/tanso.2007.107.

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21

Il’ichev, É. A., V. N. Inkin, D. M. Migunov, G. N. Petrukhin, É. A. Poltoratskiĭ, G. S. Rychkov i D. V. Shkodin. "Catalytic growth of nanostructures from carbonaceous substrates: Properties and model notions". Technical Physics Letters 36, nr 2 (luty 2010): 170–72. http://dx.doi.org/10.1134/s1063785010020239.

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22

Long, Jeffrey W., Matthew Laskoski, Teddy M. Keller, Katherine A. Pettigrew, Trevor N. Zimmerman, Syed B. Qadri i Gregory W. Peterson. "Selective-combustion purification of bulk carbonaceous solids to produce graphitic nanostructures". Carbon 48, nr 2 (luty 2010): 501–8. http://dx.doi.org/10.1016/j.carbon.2009.09.068.

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Kawaguchi, Masayuki. "Preparation, nanostructures and properties of carbonaceous materials containing boron and nitrogen". Carbon 45, nr 8 (lipiec 2007): 1718. http://dx.doi.org/10.1016/j.carbon.2007.04.006.

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24

Ajayan, P. M., i F. Banhart. "Dynamic Interfaces In Carbon Nanostructures". Microscopy and Microanalysis 5, S2 (sierpień 1999): 140–41. http://dx.doi.org/10.1017/s1431927600014021.

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Carbon nanotubes and carbon onions are two fascinating forms of crystalline nanosize carbons that have received considerable attention in recent years (1,2). The remarkable physical properties of nanotubes make them valuable material for applications ranging from electronic devices to nanoprobes. The dimensions and topology of these structures make them fascinating objects for study. Multiwalled nanotubes and onions are made of concentric graphite layers, with different geometry. Singlewalled nanotubes on the other hand are made of singular graphene cylinders, often self-assembled into larger rope-like structures. Nanotubes can be produced in gram quantities using electric arc or laser ablation. Carbon onions, however, are structures that assemble from carbonaceous soot under intense electron irradiation in an electron microscope. Hence the onions are metastable structures that become unstable and disintegrate in the absence of irradiation.The multiwalled carbon nanotubes and carbon onions have been shown to encapsulate foreign materials (metals, oxides, carbides), either during growth or by capillarity filling (in the case of nanotubes) (1), or during irradiation of metal containing soot (onions) (3).

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25

Yu, Zhiqiang, Qing Shi, Huaping Wang, Junyi Shang, Qiang Huang i Toshio Fukuda. "Controllable Melting and Flow of Ag in Self-Formed Amorphous Carbonaceous Shell for Nanointerconnection". Micromachines 13, nr 2 (29.01.2022): 213. http://dx.doi.org/10.3390/mi13020213.

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Nanointerconnection has been selected as a promising method in the post-Moore era to realize device miniaturization and integration. Even with many advances, the existing nanojoining methods still need further developments to meet the three-dimensional nanostructure construction requirements of the next-generation devices. Here, we proposed an efficient silver (Ag)-filled nanotube fabrication method and realized the controllable melting and ultrafine flow of the encapsulated silver at a subfemtogram (0.83 fg/s) level, which presents broad application prospects in the interconnection of materials in the nanometer or even subnanometer. We coated Ag nanowire with polyvinylpyrrolidone (PVP) to obtain core–shell nanostructures instead of the conventional well-established nanotube filling or direct synthesis technique, thus overcoming obstacles such as low filling rate, discontinuous metalcore, and limited filling length. Electromigration and thermal gradient force were figured out as the dominant forces for the controllable flow of molten silver. The conductive amorphous carbonaceous shell formed by pyrolyzing the insulative PVP layer was also verified by energy dispersive spectroscopy (EDS), which enabled the continued outflow of the internal Ag. Finally, a reconfigurable nanointerconnection experiment was implemented, which opens the way for interconnection error correction in the fabrication of nanoelectronic devices.

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26

MANOCHA, L. M., JIGNESH VALAND i S. MANOCHA. "FORMATION OF CARBON NANOSTRUCTURES DURING PYROLYSIS OF POLYMERS". International Journal of Nanoscience 05, nr 04n05 (sierpień 2006): 425–31. http://dx.doi.org/10.1142/s0219581x06004589.

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Carbon nanomaterials have been of great interest in nanoscience and nanotechnology because of their very small size with unique properties and simplicity in structure having only one chemical element. In our laboratory, attempts were made to synthesize carbon nanomaterials through different routes such a CCVD and pyrolysis of solids carbonaceous precursors. Pyrolysis of polyacrylonitrile fibers in presence of a suitable catalyst resulted in formation of straight as well as coil type long carbon nanofibers and tubes along with general-purpose carbon fibers. Similarly, growth of carbon nanotubes was also observed in the coke deposits during pyrolysis of pitches. The yield of CNTs formed was found to increase if the precursors are impregnated with a suitable catalyst solution. These carbon nanostructures have been characterized using XRD, TEM, SEM and TGA.

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27

Chen, Chunhong, Shanjun Mao, Chaoliang Tan, Zhe Wang, Yiyao Ge, Qinglang Ma, Xiao Zhang i in. "General Synthesis of Ordered Mesoporous Carbonaceous Hybrid Nanostructures with Molecularly Dispersed Polyoxometallates". Angewandte Chemie International Edition 60, nr 28 (7.06.2021): 15556–62. http://dx.doi.org/10.1002/anie.202104028.

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Chen, Chunhong, Shanjun Mao, Chaoliang Tan, Zhe Wang, Yiyao Ge, Qinglang Ma, Xiao Zhang i in. "General Synthesis of Ordered Mesoporous Carbonaceous Hybrid Nanostructures with Molecularly Dispersed Polyoxometallates". Angewandte Chemie 133, nr 28 (7.06.2021): 15684–90. http://dx.doi.org/10.1002/ange.202104028.

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Wen, Zhong Quan, Min Li, Shi Jin Zhu i Tian Wang. "Novel Mesoporous Carbon-Carbonaceous Materials Nanostructures Decorated with MnO2 Nanosheets for Supercapacitors". International Journal of Electrochemical Science 11, nr 3 (2016): 1810–20. http://dx.doi.org/10.1016/s1452-3981(23)16062-7.

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Zhu, Yong Ming, Hui Li Hu i Werner Weppner. "Recent Progress on Carbon Coated Lithium Titanate". Advanced Materials Research 194-196 (luty 2011): 1426–30. http://dx.doi.org/10.4028/www.scientific.net/amr.194-196.1426.

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Being inherently safe and chemically compatible with the electrolyte, lithium titanate is considered alternatives to carbonaceous anodes in Li-ion batteries. Given the commercial success of the spinel lithium titanate, carbon coated lithium titanate, particularly in nano structured forms, have been fabricated and investigated for the applications. Nano structuring leads to increased reaction areas, shortened Li+ diffusion and potentially enhanced solubility/capacity. This paper reviews structural characteristics and electrochemical reactivity, along with synthetic approaches of carbon coated nanostructures and nano-composites based on lithium titanate, recently.

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Szala, M. "Hexachloroethane as an efficient oxidizer in combustion synthesis of carbonaceous and ceramic nanostructures". International Journal of Self-Propagating High-Temperature Synthesis 19, nr 1 (marzec 2010): 28–33. http://dx.doi.org/10.3103/s106138621001005x.

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32

Duan, Huigao, Jianguo Zhao, Yongzhe Zhang, Erqing Xie i Li Han. "Preparing patterned carbonaceous nanostructures directly by overexposure of PMMA using electron-beam lithography". Nanotechnology 20, nr 13 (10.03.2009): 135306. http://dx.doi.org/10.1088/0957-4484/20/13/135306.

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Zhao, Xin, Dong-Mei Guo, Qing-Da An, Shu-Feng Bo, Zuo-Yi Xiao, Wei-Jie Cai, Hai-Song Wang, Shang-Ru Zhai i Zhong-Cheng Li. "Hierarchical nitrogen/cobalt co-doped carbonaceous materials with electromagnetic waves absorption promoting nanostructures". Journal of Alloys and Compounds 822 (maj 2020): 153666. http://dx.doi.org/10.1016/j.jallcom.2020.153666.

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Sun, Jinhua, Yuanhui Zuo, Hanyun Wang, Huancong Shi i Shijian Lu. "Global-Local CNTs Conductive Network Couple with Co-Based Polyhedral Promotes the Electrocatalytic Reduction of Oxygen". Catalysts 12, nr 12 (24.11.2022): 1508. http://dx.doi.org/10.3390/catal12121508.

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The three-dimensional (3D) nanoreactor of global-local CNTs conductive network coupled with bimetallic MOFs-derived Co@N-C nanopolyhedra (denoted as gl-CNTs/Co@N-C) promotes the electrocatalytic reduction of oxygen owing to the improved mass transfer ability and stability. Here, the 1D/3D gl-CNTs/Co@N-C nanostructures with enhanced electrocatalytic properties were synthesized in one step by the direct thermolysis of Zn/Co-ZIF/MWCNTs precursor. Based on systematical optimization of the composition and structure, gl-CNTs/Co@N-C carbonaceous porous hybrids containing uniform Co nanoparticles (NPs) can not only effectively enable the conductivity but also expose more active sites. Consequently, the optimal gl-CNTs/Co@N-C nanostructure showed a significantly enhanced catalytic activity for the reduction of oxygen, the half-wave potential (E1/2) and diffusion-limited current density are 0.86 V (vs. RHE) and 5.34 mA cm−2, respectively. Moreover, this catalyst also showed long-term durability and methanol tolerance property, further highlighting the structure superiority of a precisely controllable nanoreactor.

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Brzyska, Agnieszka, Tomasz Panczyk i Krzysztof Wolinski. "From Cyclo[18]carbon to the Novel Nanostructures—Theoretical Predictions". International Journal of Molecular Sciences 23, nr 21 (26.10.2022): 12960. http://dx.doi.org/10.3390/ijms232112960.

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In this paper, we present a number of novel pure-carbon structures generated from cyclo[18]carbon. Due to the very high reactivity of cyclo[18]carbon, it is possible to link these molecules together to form bigger molecular systems. In our studies, we generated new structures containing 18, 36 and 72 carbon atoms. They are of different shapes including ribbons, sheets and tubes. All these new structures were obtained in virtual reactions driven by external forces. For every reaction, the energy requirement was evaluated exactly when the corresponding transition state was found or it was estimated through our new approach. A small HOMO–LUMO gap in these nanostructures indicates easy excitations and the multiple bonds network indicates their high reactivity. Both of these factors suggest that some potential applications of the new nanostructures are as components of therapeutically active carbon quantum dots, terminal fragments of graphene or carbon nanotubes obtained after fracture or growing in situ in catalytic reactions leading to the formation of carbonaceous materials.

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Baker, R. T. K., i N. M. Rodriguez. "Transmission Electron Microscopy studies of catalytically grown carbon nanostructures". Proceedings, annual meeting, Electron Microscopy Society of America 53 (13.08.1995): 408–9. http://dx.doi.org/10.1017/s0424820100138415.

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In recent years a great deal of research effort has been devoted to the synthesis of carbon structures possessing extensive crystalline order. Methods used for the preparation of such materials center around arc-discharge procedures, however, separation and purification of the desired product has proven rather difficult. Studies carried out in our laboratory have led to the developement of an alternative approach, which involve the participation of a metal catalyst for the production of various carbonaceous structures. Carbon nanofibers are the product of the catalytic decomposition of selected hydrocarbons and carbon monoxide over metal particles. In this process, the hydrocarbon is adsorbed and decomposed on certain faces of the metal, carbon species diffuse through the particle to precipitate at another set of faces to form graphite as illustrated in Figure 1. The structure of the nanofiber is therefore dependent on the geometric orientation and the number of carbon precipitating faces in the metal particle.

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Warneke, Ziyan, Markus Rohdenburg, Jonas Warneke, Janina Kopyra i Petra Swiderek. "Electron-driven and thermal chemistry during water-assisted purification of platinum nanomaterials generated by electron beam induced deposition". Beilstein Journal of Nanotechnology 9 (8.01.2018): 77–90. http://dx.doi.org/10.3762/bjnano.9.10.

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Focused electron beam induced deposition (FEBID) is a versatile tool for the direct-write fabrication of nanostructures on surfaces. However, FEBID nanostructures are usually highly contaminated by carbon originating from the precursor used in the process. Recently, it was shown that platinum nanostructures produced by FEBID can be efficiently purified by electron irradiation in the presence of water. If such processes can be transferred to FEBID deposits produced from other carbon-containing precursors, a new general approach to the generation of pure metallic nanostructures could be implemented. Therefore this study aims to understand the chemical reactions that are fundamental to the water-assisted purification of platinum FEBID deposits generated from trimethyl(methylcyclopentadienyl)platinum(IV) (MeCpPtMe3). The experiments performed under ultrahigh vacuum conditions apply a combination of different desorption experiments coupled with mass spectrometry to analyse reaction products. Electron-stimulated desorption monitors species that leave the surface during electron exposure while post-irradiation thermal desorption spectrometry reveals products that evolve during subsequent thermal treatment. In addition, desorption of volatile products was also observed when a deposit produced by electron exposure was subsequently brought into contact with water. The results distinguish between contributions of thermal chemistry, direct chemistry between water and the deposit, and electron-induced reactions that all contribute to the purification process. We discuss reaction kinetics for the main volatile products CO and CH4 to obtain mechanistic information. The results provide novel insights into the chemistry that occurs during purification of FEBID nanostructures with implications also for the stability of the carbonaceous matrix of nanogranular FEBID materials under humid conditions.

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Poyraz, Selcuk, Marissa Flogel, Zhen Liu i Xinyu Zhang. "Microwave energy assisted carbonization of nanostructured conducting polymers for their potential use in energy storage applications". Pure and Applied Chemistry 89, nr 1 (1.01.2017): 173–82. http://dx.doi.org/10.1515/pac-2016-1109.

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AbstractThree well-established one-step approaches, namely, conducting polymer (CP) nanofiber (NF) synthesis by NF seeding, CP nanoclip (NC) synthesis by oxidative template, and microwave (MW) energy-assisted carbonization were systematically combined to prepare carbonaceous nanostructures from CPs, with great potential as the active material for energy storage purposes. Polypyrrole (PPy), as one of the most well-known and commonly studied members of the CP family was prepared in both NF and NC forms, as the sacrificial carbonization precursor, for different property comparison purposes. Due to conducting polymers’ high electron mobility and easily exciting nature under MW irradiation, both PPy NF and NC samples had vigorously interacted with MWs. The as-obtained carbonaceous samples from such interactions exhibited high thermal stabilities, competitive specific capacitance values and long-term stable electrochemical cyclic performances, which are crucial for the active materials used in energy storage applications. Thus, it is believed that, this well-established and well-studied process combination will dominate the large-scale manufacturing of the carbon-based, active energy storage materials from CPs.

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Szabó, Anna, Gábor Kovács, Anita Kovács i Klara Hernadi. "Different Pathways for Synthesis of WO3 and Vertically Aligned Carbon Nanotube-Based Nanostructures". Journal of Nanoscience and Nanotechnology 21, nr 4 (1.04.2021): 2388–93. http://dx.doi.org/10.1166/jnn.2021.18964.

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The synthesis and investigation of vertically aligned carbon nanotube (VACNT) based materials are gaining more-and-more interest among scientists due to their specific properties (e.g., electrical, optical, mechanical). Therefore, our interest for the present research has focused on synthesis of WO3/VACNT based nanostructures (using carbon nanotube forests obtained by catalytic chemical vapor deposition—CCVD method on aluminum substrate) using different synthesis pathways and WO3 precursors. The obtained composites were investigated by scanning electron microscopy (SEM), Raman spectroscopy, while the obtained crystal structures were characterized by X-ray diffraction (XRD). Results have shown that depending on the synthesis method, and using as template the carbonaceous structure, we can successfully obtain non-stochiometric tungsten oxide (W18O49) or WO3 composites.

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Tavangar, Amirhossein, Bo Tan i Krishnan Venkatakrishnan. "Sustainable approach toward synthesis of green functional carbonaceous 3-D micro/nanostructures from biomass". Nanoscale Research Letters 8, nr 1 (2013): 348. http://dx.doi.org/10.1186/1556-276x-8-348.

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Bi, Jingran, Yao Li, Haitao Wang, Yukun Song, Shuang Cong, Chenxu Yu, Bei-Wei Zhu i Mingqian Tan. "Presence and Formation Mechanism of Foodborne Carbonaceous Nanostructures from Roasted Pike Eel (Muraenesox cinereus)". Journal of Agricultural and Food Chemistry 66, nr 11 (14.06.2017): 2862–69. http://dx.doi.org/10.1021/acs.jafc.7b02303.

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Song, Xiazi, Hua Feng, Jianing Xie i Jing Zhao. "A theoretical study on the application of different carbonaceous nanostructures in K-ion batteries". Monatshefte für Chemie - Chemical Monthly 151, nr 9 (20.08.2020): 1329–36. http://dx.doi.org/10.1007/s00706-020-02659-6.

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Chen, Chuyang, Bryan Harry Rahmat Suryanto, Chuan Zhao, Xuchuan Jiang i Aibing Yu. "Nanostructures: Direct Hydrothermal Synthesis of Carbonaceous Silver Nanocables for Electrocatalytic Applications (Small 29/2015)". Small 11, nr 29 (sierpień 2015): 3556. http://dx.doi.org/10.1002/smll.201570174.

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Chen, Dongzhen, Tongshan Chen, Yang Li, Shengxu Li, Liang Zhang, Yanwei Ren, Yaowu Wang i in. "A Flexible Sensor Based on 3D Gold@Carbonaceous Nanohybrid with Defect Sites of Conductivity for the Wearable Sensing at Low Stress". Nano 16, nr 04 (25.03.2021): 2150044. http://dx.doi.org/10.1142/s1793292021500442.

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The detection of subtle strain on the human body by flexible sensors suffers from the inferior sensitivity. In general, poor sensitivity derives from the intact structural integrity of building blocks of electric material. Inspired by the rolling friction in daily life, a three-dimensional (3D) nanohybrid of gold@carbonaceous nanoballs (Au@CBs) is developed. Compared with the pure Au nanostructure, the CBs increase the defect sites of conductivity and deformation sensitivity between Au nanostructures. The Flexible Stress Sensor (FSS) based on the 3D nanohybrid of Au@CBs is fabricated, and due to the enough displacement variation of 3D nanohybrid of Au@CBs, the change of resistance could be triggered by the tiny stress. The as-prepared sensor has high sensitivity at wide working range ([Formula: see text][Formula: see text]KPa[Formula: see text], 0.1–10[Formula: see text]KPa and [Formula: see text][Formula: see text]KPa[Formula: see text], 10–100[Formula: see text]KPa) and good cyclic stability (5000 cycles). Finally, the FSS based on the 3D nanohybrid of Au@CBs is employed for the detection of subtle vibration and movement of the human body, such as pulse and joint bending, which exerts great potential as wearable electronics.

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Kokorina, Alina A., Alexey V. Ermakov, Anna M. Abramova, Irina Yu Goryacheva i Gleb B. Sukhorukov. "Carbon Nanoparticles and Materials on Their Basis". Colloids and Interfaces 4, nr 4 (25.09.2020): 42. http://dx.doi.org/10.3390/colloids4040042.

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Carbon nanoparticles (CNPs) are novel nanostructures with luminescent properties. The development of CNPs involves the elaboration of various synthetic methods, structure characterization, and different applications. However, the problems associated with the CNP structure definition and properties homogeneity are not solved and barely described in depth. In this feature article, we demonstrate the approaches for the effective separation and purification of CNPs by size and size/charge ratio. We propose a promising way for the synthesis of the uniform-size structures by the application of calcium carbonate porous microparticles as reactors with defined size. Additionally, the application of the CNPs agglomerates for controllable release systems triggered by light and in-situ synthesis of fluorescent conductive carbonaceous films on the base of polyelectrolyte multilayers are under consideration.

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Karaxi, Evangelia K., Irene A. Kanellopoulou, Anna Karatza, Ioannis A. Kartsonakis i Costas A. Charitidis. "Fabrication of carbon nanotube-reinforced mortar specimens: evaluation of mechanical and pressure-sensitive properties". MATEC Web of Conferences 188 (2018): 01019. http://dx.doi.org/10.1051/matecconf/201818801019.

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Carbon-based nanomaterials are promising reinforcing elements for the development of “smart” self-sensing cementitious composites due to their exceptional mechanical and electrical properties. Significant research efforts have been committed on the synthesis of cement-based composite materials reinforced with carbonaceous nanostructures, covering every aspect of the production process (type of nanomaterial, mixing process, electrode type, measurement methods etc.). In this study, the aim is to develop a well-defined repeatable procedure for the fabrication as well as the evaluation of pressure-sensitive properties of intrinsically self-sensing cementitious composites incorporating carbon- based nanomaterials. Highly functionalized multi-walled carbon nanotubes with increased dispersibility in polar media were used in the development of advanced reinforced mortar specimens which increased their mechanical properties and provided repeatable pressure-sensitive properties.

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Barin, Gabriela Borin, Thalita Santos Bispo, Iara de Fátima Giminenez i Ledjane Silva Barreto. "Carbon Nanostructures Synthesize from Coconut Coir Dust Mediated by Layered Clays through Hydrothermal Process". Materials Science Forum 727-728 (sierpień 2012): 1355–59. http://dx.doi.org/10.4028/www.scientific.net/msf.727-728.1355.

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Brazil has a large potential for energy generation and development of new materials from renewable resources through eco-friendly routes, which presents an alternative for construction of an eco-technological platform, where the entire lifecycle of the material or industrial product be sustainable. The proposal of the present work was synthesize carbon nanostructures from coconut coir dust and via template synthesis mediated by layered clays through hydrothermal process. The obtained materials were characterized by Raman Spectroscopy, Fourier Transform Infrared Spectroscopy and Scanning Electron Microscope (SEM). Carbon phase formation was indicated by infrared results with bands at 1444 cm-1and 1512 cm-1assigned to C=C of aromatic groups. Raman spectroscopy results showed presence of carbonaceous species by the appearance of D and G bands assigned to disordered and graphitic crystallites, respectively. SEM results showed overlapping sheets and plates formation. High Resolution Transmission Electron Microscopy measures are in progress.

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Jaiswar, R., C. Bailly, S. Hermans, J. P. Raskin i I. Huynen. "Wideband microwave absorption in thin nanocomposite films induced by a concentration gradient of mixed carbonaceous nanostructures". Journal of Materials Science: Materials in Electronics 30, nr 21 (8.10.2019): 19147–53. http://dx.doi.org/10.1007/s10854-019-02271-3.

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Luo, Wen, Jingke Ren, Wencong Feng, Xingbao Chen, Yinuo Yan i Noura Zahir. "Engineering Nanostructured Antimony-Based Anode Materials for Sodium Ion Batteries". Coatings 11, nr 10 (11.10.2021): 1233. http://dx.doi.org/10.3390/coatings11101233.

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Sodium-ion batteries (SIBs) are considered a potential alternative to lithium-ion batteries (LIBs) for energy storage due to their low cost and the large abundance of sodium resources. The search for new anode materials for SIBs has become a vital approach to satisfying the ever-growing demands for better performance with higher energy/power densities, improved safety and a longer cycle life. Recently, antimony (Sb) has been extensively researched as a promising candidate due to its high specific capacity through an alloying/dealloying process. In this review article, we will focus on different categories of the emerging Sb based anode materials with distinct sodium storage mechanisms including Sb, two-dimensional antimonene and antimony chalcogenide (Sb2S3 and Sb2Se3). For each part, we emphasize that the novel construction of an advanced nanostructured anode with unique structures could effectively improve sodium storage properties. We also highlight that sodium storage capability can be enhanced through designing advanced nanocomposite materials containing Sb based materials and other carbonaceous modification or metal supports. Moreover, the recent advances in operando/in-situ investigation of its sodium storage mechanism are also summarized. By providing such a systematic probe, we aim to stress the significance of novel nanostructures and advanced compositing that would contribute to enhanced sodium storage performance, thus making Sb based materials as promising anodes for next-generation high-performance SIBs.

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Tiwari, Neeru, Neha Agarwal, Debmalya Roy, Kingsuk Mukhopadhyay i Namburi Eswara Prasad. "Tailor Made Conductivities of Polymer Matrix for Thermal Management: Design and Development of Three-Dimensional Carbonaceous Nanostructures". Industrial & Engineering Chemistry Research 56, nr 3 (9.01.2017): 672–79. http://dx.doi.org/10.1021/acs.iecr.6b03245.

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