Gotowe bibliografie tematyczne / Carbonaceous nanoparticles

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Gotowa bibliografia na temat „Carbonaceous nanoparticles”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Carbonaceous nanoparticles"

Duley, W. W. "Carbon Nanoparticles and Carbonaceous Solids". Proceedings of the International Astronomical Union 10, H16 (sierpień 2012): 711–12. http://dx.doi.org/10.1017/s1743921314013027.

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AbstractThis paper reports on the preparation of hydrogenated amorphous carbon nano-particles whose spectral characteristics include an absorption band at 217.5 nm with the profile and characteristics of the interstellar 217.5 nm feature. Vibrational spectra of these particles also contain the features commonly observed in IR absorption and emission from dust in the diffuse interstellar medium. These materials are produced under “slow“ deposition conditions by minimizing the flux of incident carbon atoms and by reducing surface mobility.

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Mennella, Vito. "Synthesis and Transformation of Carbonaceous Nanoparticles". Proceedings of the International Astronomical Union 10, H16 (sierpień 2012): 715–16. http://dx.doi.org/10.1017/s1743921314013040.

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AbstractThe physical properties of carbonaceous nanoparticles depend on the production conditions. In addition, these properties are modified by heat, UV and ion irradiation and gas interaction. We will discuss the synthesis and transformation of carbon nanoparticles that have been proposed as carriers of aromatic and aliphatic spectroscopic features observed in the interstellar medium.

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Das, Tanmoy, Praveen Kumar i Jinu Paul. "Resistance Spot Welded Al 1100 Alloy with Carbonaceous Interlayers". Materials Science Forum 978 (luty 2020): 3–11. http://dx.doi.org/10.4028/www.scientific.net/msf.978.3.

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Weld and surface properties of Al 1100 alloy by incorporating graphene nanoparticles, different varieties of graphite and CNTs interlayer has been studied here. The incorporation of different carbonaceous interlayers was achieved by drop casting and alloy plates were joined together by resistance spot welding technique. A single optimum welding current and time parameter was chosen by trial and error method. Lap shear tests were carried out to find the peak load bearing strengths of the alloy plates processed at the constant welding current and time conditions and a comparison of the weld strength is made. Highest load bearing capacity was exhibited by the base material as compared to that of carbonaceous nanoparticles. Microstructural characterization was done by optical microscopy and SEM. XRD was carried out to find the formation of any intermetallics or phases during the processing. Fractography was studied to analyze the underlying fracture mechanism. Micro-hardness of the Al samples processed with different carbonaceous reinforcements was found out and the maximum hardness was exhibited by the finer sized carbon nanoparticles. A comparative study is being made between the various carbonaceous nanoparticles employed here.

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Haq, Izhar ul, AA Khurram, Rizwan Hussain i Shahzad Naseem. "Designing and manufacturing of a lightweight and broadband electromagnetic wave absorber with combined carbonaceous and magnetic nanofillers". Polymers and Polymer Composites 27, nr 4 (9.01.2019): 215–21. http://dx.doi.org/10.1177/0967391118822794.

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Two different types of microwave absorbers composed of two layers and four layers of nanocomposites have been designed in the light of the theory of electromagnetic wave absorbers and tested. The nanocomposites were prepared from glass fiber/epoxy filled with carbonaceous and magnetic nanoparticles. The carbonaceous nanoparticles include multiwalled carbon nanotubes, graphene nanoplatelets (GNPs), and thermally exfoliated GNPs, whereas magnetic nanoparticles include CoFe3O4, CoNiFe3O4, MnFe3O4 in different weight percentage. The absorbers with two layers of nanocomposites had total designed thickness of 3.3 mm. The surface layer of those absorbers is made of lower permittivity nanocomposite as compared to the bottom layer. On the other hand, the absorbers with four layers of nanocomposites have alternating combination of layers filled with carbonaceous and magnetic nanoparticles. The measurement of reflectivity using free space method have shown that among all the designed microwave absorbers, one of the absorber with two layers of nanocomposites have shown least reflectivity (−24 dB) and higher −10 dB bandwidth (9 GHz). That absorber is composed of low permittivity surface layer filled with equal wt% (4 wt%) of magnetic nanoparticles, that is, CoFe3O4, CoNiFe3O4, MnFe3O4, and a bottom lossy layer filled with 2.6 wt% of carbon nanotubes.

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Choudhary, Harish Kumar, Rajeev Kumar, Shital Patangrao Pawar, Uttandaraman Sundararaj i Balaram Sahoo. "Superiority of graphite coated metallic-nanoparticles over graphite coated insulating-nanoparticles for enhancing EMI shielding". New Journal of Chemistry 45, nr 10 (2021): 4592–600. http://dx.doi.org/10.1039/d0nj06231f.

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Hou, Dingyu, Diyuan Zong, Casper S. Lindberg, Markus Kraft i Xiaoqing You. "On the coagulation efficiency of carbonaceous nanoparticles". Journal of Aerosol Science 140 (luty 2020): 105478. http://dx.doi.org/10.1016/j.jaerosci.2019.105478.

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Cohen, Sarah, Evgeni Zelikman i Ran Yosef Suckeveriene. "Ultrasonically Induced Polymerization and Polymer Grafting in the Presence of Carbonaceous Nanoparticles". Processes 8, nr 12 (19.12.2020): 1680. http://dx.doi.org/10.3390/pr8121680.

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Nanotechnology refers to technologies using at least one nanometric dimension. Most advances have been in the field of nanomaterials used in research and industry. The vast potential of polymeric nanocomposites for advanced materials and applications such as hybrid nanocomposites with customized electrical conductivity, anti-bacterial, anti-viral, and anti-fog properties have attracted considerable attention. The number of studies on the preparation of nanocomposites in the presence of carbon materials, i.e., carbon nanotubes (CNTs) and graphene, has intensified over the last decade with the growing interest in their outstanding synergic properties. However, the functionality of such nanocomposites depends on overcoming three key challenges: (a) the breakdown of nanoparticle agglomerates; (b) the attachment of functional materials to the nanoparticle surfaces; and (c) the fine dispersion of functional nanoparticles within the polymeric matrices. Ultrasonic polymerization and grafting in the presence of nanoparticles is an innovative solution that can meet these three challenges simultaneously. These chemical reactions are less well known and only a few research groups have dealt with them to date. This review focuses on two main pathways to the design of ultrasonically induced carbon-based nanocomposites: the covalent approach which is based on the chemical interactions between the carbon fillers and the matrix, and the non-covalent approach which is based on the physical interactions.

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Nowak, Andrzej P., A. Lisowska-Oleksiak, K. Siuzdak, M. Sawczak, M. Gazda, J. Karczewski i G. Trykowski. "Tin oxide nanoparticles from laser ablation encapsulated in a carbonaceous matrix – a negative electrode in lithium-ion battery applications". RSC Advances 5, nr 102 (2015): 84321–27. http://dx.doi.org/10.1039/c5ra10854c.

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Wu, Yun, Mei Wang, Shaojuan Luo, Yunfeng Gu, Dongyang Nie, Zhiyang Xu, Yue Wu, Mindong Chen i Xinlei Ge. "Comparative Toxic Effects of Manufactured Nanoparticles and Atmospheric Particulate Matter in Human Lung Epithelial Cells". International Journal of Environmental Research and Public Health 18, nr 1 (22.12.2020): 22. http://dx.doi.org/10.3390/ijerph18010022.

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Although nanoparticles (NPs) have been used as simplified atmospheric particulate matter (PM) models, little experimental evidence is available to support such simulations. In this study, we comparatively assessed the toxic effects of PM and typical NPs (four carbonaceous NPs with different morphologies, metal NPs of Fe, Al, and Ti, as well as SiO2 NPs) on human lung epithelial A549 cells. The EC50 value of PM evaluated by cell viability assay was 148.7 μg/mL, closest to that of SiO2 NPs, between the values of carbonaceous NPs and metal NPs. All particles caused varying degrees of reactive oxygen species (ROS) generation and adenosine triphosphate (ATP) suppression. TiO2 NPs showed similar performance with PM in inducing ROS production (p < 0.05). Small variations between two carbonaceous NPs (graphene oxides and graphenes) and PM were also observed at 50 μg/mL. Similarly, there was no significant difference in ATP inhibition between carbonaceous NPs and PM, while markedly different effects were caused by SiO2 NP and TiO2 NP exposure. Our results indicated that carbonaceous NPs could be served as potential surrogates for urban PM. The identification of PM model may help us further explore the specific roles and mechanisms of various components in PM.

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Shi, Hengchong, Dean Shi, Ligang Yin, Zhihua Yang, Shifang Luan, Jiefeng Gao, Junwei Zha, Jinghua Yin i Robert K. Y. Li. "Ultrasonication assisted preparation of carbonaceous nanoparticles modified polyurethane foam with good conductivity and high oil absorption properties". Nanoscale 6, nr 22 (2014): 13748–53. http://dx.doi.org/10.1039/c4nr04360j.

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Rozprawy doktorskie na temat "Carbonaceous nanoparticles"

Kovačević, Eva. "Plasma polymerized carbonaceous nanoparticles application as astroanalog /". [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=981209769.

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Duca, Dumitru. "Physico-chemical characterization of size-selected internal combustion engine nanoparticles and original method for measuring adsorption energies on carbonaceous surfaces by laser mass spectrometry". Thesis, Lille 1, 2020. http://www.theses.fr/2020LIL1R019.

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Les émissions de nanoparticules carbonées par le transport automobile sont au centre de nombreuses recherches en raison de leur impact sur le climat et la santé humaine. Les normes actuelles de l’Union Européenne régulent le nombre de particules émises ayant des tailles supérieures à 23 nm. Pour contribuer au développement d’une méthodologie de mesure fiable permettant de baisser cette limite à 10 nm, nous avons entrepris (dans le projet H2020 PEMS4Nano) une caractérisation physico-chimique avancée de particules sélectionnées en taille émises par un moteur essence. La composition chimique a été étudiée par spectrométrie de masse, des informations structurelles et morphologiques ont été déduites par microscopie à force atomique, microscopie électronique à transmission et à balayage, et spectroscopie Raman exaltée par effet de pointe. Pour mieux comprendre l’interaction entre la surface et les composés adsorbés, une nouvelle méthode laser de mesure de l’énergie d’adsorption a été développée
Emission of carbonaceous aerosols by combustion-powered ground transport vehicles has a major impact on both global climate and human health. Intensive research efforts are dedicated to the development of robust procedures able to reliably measure particles as small as 10 nm in real-driving conditions, as current European Union regulations are limited to 23 nm. Within the H2020 PEMS4Nano project, we performed detailed physico-chemical characterization of size-selected particulate matter emitted by a gasoline direct injection engine. This included chemical characterization performed with mass spectrometry as well as structural/morphology data obtained with electron and atomic force microscopy together with Tip-Enhanced Raman Spectroscopy. In addition, to gain insight into the interaction between the carbonaceous surface and adsorbed compounds, a novel laser-based method for determining the adsorption energy of chemical species on carbonaceous surfaces was developed

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Feraud, Géraldine. "Molécules et nanoparticules aromatiques du milieu interstellaire : production et caractérisation au laboratoire". Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00889634.

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Ce travail de thèse traite d'expériences d'astrophysique de laboratoire sur des matériaux aromatiques, étudiés pour la plupart dans des conditions proches de celles rencontrées dans les milieux interstellaire et circumstellaire, comprenant rayons cosmiques et irradiations UV. Ces dernières sont à l'origine de bandes d'émission dans l'infrarouge moyen, dont les porteurs supposés sont principalement les Hydrocarbures Aromatiques Polycycliques (PAHs) et les nanoparticules aromatiques. Un nouveau spectromètre, FIREFLY (Fluorescence in the InfraRed from Excited FLYing molecules), contenant une réplique des filtres circulaires variables à bord de l'instrument ISOCAM du satellite ISO, a été mis au point et caractérisé au cours de cette thèse. Cet instrument a permis de mesurer la désexcitation infrarouge dans la région des modes d'élongations CH (3.3 µm, soit 3000 cm-1) des dérivés du benzène et du naphtalène à température ambiante, suite à l'absorption d'un photon UV. Ceci montre, avec l'appui de la modélisation, que la spectroscopie d'émission IR est un outil puissant permettant de comprendre les effets d'anharmonicité liés à l'énergie interne, l'isomérisation voire même la dynamique intramoléculaire non-adiabatique, au travers de la spectroscopie d'excitation de fluorescence infrarouge (une nouvelle technique). Ce travail est préliminaire à la future mesure de fluorescence infrarouge de nanoparticules aromatiques en phase gazeuse et à basse température produites par une flamme basse pression, dans le but de comparer les spectres de laboratoire avec les observations astrophysiques. Le dépôt d'énergie par les rayons cosmiques a été étudié grâce à une autre expérience, l'irradiation ionique d'analogues de poussières interstellaires et circumstellaires (suies produites par la flamme basse pression), mettant en évidence une réorganisation chimique. Les suies sont caractérisées par différents diagnostics complémentaires tels que la Microscopie Electronique en Transmission à Haute Résolution et les spectroscopies infrarouge à Transformée de Fourier et Raman. L'ensemble des informations tirées permet de mieux cerner la nanostructuration des analogues et ainsi mieux identifier les différentes signatures spectrales astrophysiques (interprétation de la bande à 7.7 µm comme une bande de défauts). Grâce à ces expériences, nous espérons améliorer notre compréhension de la structure, croissance et évolution de la poussière, d'un point de vue astrophysique.

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Katti, Prajakta Prathamkumar. "Structure-Property correlation in epoxy composites containing carbonaceous nanoparticles". Thesis, 2019. https://etd.iisc.ac.in/handle/2005/5006.

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Epoxy is widely used as thermosetting materials in carbon fiber composites due to its combined superior thermal and mechanical properties which makes them a potential candidate for myriad applications. But epoxy suffers from certain demerits such as brittle behavior and low fracture toughness. So, in this thesis attempt has been made to overcome the demerits of epoxy with the incorporation of functionalized multi-walled carbon nanotubes (MWNT) and graphene oxide (GO). Two different approaches were followed. In one case, the reinforcing agents were functionalized with a macromolecule that is miscible with the host pre-curing and in the other case, the nanoparticles were grafted with epoxy chains to improve the chemical compatibility with the host. These approaches were followed mainly to improve the state of dispersion of nanoparticles in the composites and further to enhance the interfacial adhesion between the epoxy host and the carbon fiber (CF) in case of the laminates. The thesis entitled “Structure-Property correlation in epoxy composites containing carbonaceous nanoparticles” systematically and thoroughly studies the effect of these functionalized carbonaceous particles on various properties of epoxy composites and epoxy/CF laminates

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Kovačević, Eva [Verfasser]. "Plasma polymerized carbonaceous nanoparticles : application as astroanalog / von Eva Kovačević". 2006. http://d-nb.info/981209769/34.

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Duffy, E. "Carbonaceous nanoparticles and carbon on carbon composite materials : preparation, properties and application in adsorption". Thesis, 2015. https://eprints.utas.edu.au/23166/2/Duffy_whole_thesis_ex_pub_mat.pdf.

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The inclusion of carbonaceous nanoparticles (CNPs) in composite materials is an area of significant research interest. Their addition is expected to result in differing properties, and a possible transfer of the CNP’s favourable properties to the final composite. Detonation nanodiamond (DND) has emerged as an interesting CNP, offering an array of attractive properties, including mechanical stability, thermal conductivity and a flexible surface chemistry, that make it an ideal candidate for integration in composite materials. This material still requires further characterisation in order to fully understand its colloidal stability, aggregation behaviour and batchto-batch variability. The aim of the present thesis was to investigate DND as a new candidate for inclusion in the synthesis of novel carbon monolithic composite materials suitable for potential application in analytical chemistry, separation and adsorption processes, sensors or electrode materials. To address the variable nature of this CNP, new approaches for its characterisation and modification have been investigated. Capillary electrophoresis (CE) was shown to provide an insight into the onset of particle aggregation and offered the capability of separating DND from different sources or purification processes. Surface modification with silanes resulted in hydrophobisation and improved DND colloidal stability. After a detailed characterisation of these different DND materials, a commercial suspension of single-digit DND particles was selected for preparation of carbon on carbon composites. Hierarchical porous graphitic carbon-nanodiamond monoliths (CND) were prepared by adding DND to a resorcinol formaldehyde copolymer, with silica gel as a hard template. The influence of DND was systematically studied and for the first time it has been shown that altering DND content can allow for facile tuning of surface areas, pore sizes, and graphitic nature of carbon monoliths. The first controlled production of novel structures resulting from DND inclusion within the composite monoliths, such as carbon onions, has been achieved. Properties of CND composites including graphitic character, surface area, morphology, pore structures and adsorption performance for organic dyes were studied in detail. CND materials embody an interesting new group of carbon on carbon composite materials with potential for application in areas including adsorption, extraction, catalysis and electrode materials.

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Kar, Goutam Prasanna. "Structure-Property Correlation in Binary Immiscible Polymer Blends Compatibilized by Mutually Miscible Homopolymer and Carbonaceous Nanoparticles". Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5367.

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The thesis systematically studies the various morphology, mechanical properties, crystallization kinetics and compatibilization effects of homopolymers, carbonaceous nanoparticles such as multiwall carbon nanotubes (MWNTs), graphene oxides (GOs) and conducting polymer blends were fabricated to develop electromagnetic interference shielding materials. Polyvinylidene difluoride (PVDF)/ acrylonitrile butadiene styrene (ABS) immiscible polymer blends were chosen as model immiscible system in order to improve mechanical properties of PVDF and to generate interconnected three dimensional conducting networks with the help of conducting inclusion such as MWNTs.

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De, Filippo Andrea. "Characterization of carbonaceous nanoparticle size distributions (1-10 nm) emitted from laboratory flames, diesel engines and gas appliances". Tesi di dottorato, 2008. http://www.fedoa.unina.it/3235/1/Andrea_De_Filippo-PhD_Thesis2008.pdf.

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Commercially available SMPS and a differential mobility analyser (DMA) designed to enable detection of particles as small as 1 nm were used to provide further information about nanoparticles emitted from premixed flames, engines and common burners, with particular attention to the 1-10 nm range. Premixed laboratory flames were studied to examine carbonaceous nanoparticle formation in fuel rich burning conditions near the onset of soot formation. Nanoparticles were measured at different carbon/oxygen (C/O) ratio and at different heights above the burner surface in order to evaluate their behaviour in high temperature conditions. The measured size distributions showed that the first particles observed in flames have a size of ~2nm (Mode I), consistent with previous in situ measurements by light scattering and extinction (LSE), size distributions determined by Atomic Force Microscopy (AFM) of particles deposited by thermophoresis on mica substrates and off-line size measurements of material captured in water samples from the same flames. A larger 3-7 nm particle mode (Mode II) was measured in richer flames and later in the flame, which was not previously distinguished by optical measurements, which can only give the d6-3 diameter (ratio of the 6th and 3rd moments of the size distribution) or in the size distributions determined by AFM, which had lower resolution. This larger mode is also not observed in water samples collected from flames even when their concentration is as large as or larger than the 2nm mode, presumably because the larger particles are hydrophobic. The evolution of these two nanoparticles modes was studied in a flame with C/O = 0.65 at different height above the burner surface. The results were consistent with the conceptual framework for particle inception, advanced in earlier works based on UV-visible optical measurements, and for particle coagulation which seemed to increase because of the appearance of mode II, in agreement with the size-dependent coagulation rate addressed in previous studies based on optical measurement and atomic force microscopy (AFM). To begin addressing the question of whether or not such small particles are also found in the exhausts/emissions of applied combustion systems were they may be inhaled by hu-mans or interact with the atmosphere, size distributions of nanoparticles generated by a burner, a test engine and diesel vehicles were measured. The emissions from a test bench single-cylinder engine and from two modern light-duty diesel vehicles run with commercial ultralow sulphur fuel indicated the presence of a “solid” particle nucleation mode (~ 10nm or lower) which accompanied normal soot emissions (~ 60 nm). In diesel vehicle tests, this mode, most prominent at idle, was highly sensitive to the level of exhaust gas recirculation (EGR), non-volatile to temperature higher than 400 C and electrically charged. All of these characteristics suggest that these solid particles were formed during combustion and not by lower temperature condensation processes as the exhaust cools. An important conclusion of these tests was also that the specific diesel particulate filters employed removed the “solid” nucleation mode and the soot with efficiency comparable to soot. Tests on bench single-cylinder engines again indicated that the smallest nanoparticles were highly influenced by the EGR levels but also the type of injections and the type of fuel employed have an effect on the emitted particulate. Preliminary measurements on domestic gas appliances burning methane also showed the presence of nanoparticles in the size range 1-3 nm in the plume near the burner, in agreement with optical absorption measurements and time resolved fluorescence polarization anisotropy (TRFPA) analysis on water samples from the same flames.

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Części książek na temat "Carbonaceous nanoparticles"

Mousavi, Seyyed Mojtaba, Khadije Yousefi, Seyyed Alireza Hashemi i Sonia Bahrani. "Hybrid Magnetic nanoparticles–Carbonaceous nanomaterials (carbon nanotube/graphene)". W Magnetic Nanoparticle-Based Hybrid Materials, 121–38. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-823688-8.00024-7.

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Vashisht, Devika, Priyanka, Aseem Vashisht, Shweta Sharma i Surinder Kumar Mehta. "Properties of Carbonaceous Quantum Dots". W Carbonaceous Quantum Dots: Synthesis And Applications, 38–52. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815136265123010006.

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Carbonaceous quantum dots (CQDs) is defined as a subclass of carbon nanoparticles, which offer a size of around 10 nm, and have unique characteristics and a wide range of applications in diverse fields. CQDs have attained widespread attention due to their excellent abilities in several domains, including sensing, nanomedicine and environmental remediation. The mode of synthesis for CQDs is quite simple and inexpensive via methods such as microwave pyrolysis, arc-discharge, etc. CQDs are entitled to diverse physical, chemical and biological properties. Besides this, CQDs have various functional groups present on their surface that improve the properties, specifically the catalytic performance by a phenomenon called charge transfer. The physical, optical, electrical, and biological features of CQDs are explored in this chapter.

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Thakur, Abhinay, Ashish Kumar i Sumayah Bashir. "Introduction to Carbonaceous Quantum Dots". W Carbonaceous Quantum Dots: Synthesis And Applications, 1–19. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815136265123010004.

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Carbonaceous quantum dots (CQDs), relatively small carbon nanoparticles (<10 nm in size), have sparked the attention over the last few decades for their potential as a promising resource in various fields, such as biomedical, solar cells, sensors, water treatment, energy generation storage because of their benign, abundant, low preparation costs, small size, non-hazardous nature, high biocompatibility, high water solubility and effective alteration nature. Numerous applications in optronics, catalysis, and sensing are made possible by the excellent electronic characteristics of CQDs as electron acceptors and donors that cause photocatalytic activity and electrochemical luminosity. This feature series aims to assess the current status of CQDs by discussing the literature in this field and deliberate the basics, applicability and advancements in the field of CQDs in both scientific and technology circles.

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Tolmachev, S., i O. Belichenko. "Properties of fine cement concretes with carbonaceous nanoparticles". W Computational Vision and Medical Image Processing, 313–24. CRC Press, 2011. http://dx.doi.org/10.1201/b11570-45.

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"Properties of fine cement concretes with carbonaceous nanoparticles". W Concrete Solutions 2011, 327–38. CRC Press, 2011. http://dx.doi.org/10.1201/b11585-46.

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García, Yarima S. "Application of Carbonaceous Quantum Dots in Biomedical". W Carbonaceous Quantum Dots: Synthesis And Applications, 78–93. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815136265123010008.

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Numerous research fields, including chemistry, electronics, and medical sciences, have concentrated on the production and use of novel functional nanomaterials. Carbon, a component of all organic life forms, is essential for the creation of nanomaterials. The modern carbon-based family component known as carbonaceous quantum dots (CQD) was unintentionally discovered in 2004 while single-walled carbon nanotubes were being purified. Additionally, CQDs have exceptional qualities like outstanding photoluminescence and minimal toxic effects. Outstanding in vitro andin vivo biomedical implications of CQDs include drug/gene delivery, biosensor biotherapy, and theragnostic evolution. Also, CQDs can pass through specific body sites of endothelial inflammation (epithelium of the intestinal tract, liver, for example), tumors or penetrate capillaries due to their small size. For the same reason, nanoparticles are more suitable for intravenous administration than microparticles and also prevent particle aggregation and bypass emboli or thrombi formation. This chapter describes the most contemporary applications of CQDs in diverse biomedical fields. We hope it will provide incalculable insights to inspire discoveries on CQD and delineate a road map toward a broader range of bio applications.

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"Carbon Materials for Gas and Bio-Sensing Applications Beyond Graphene". W Materials Research Foundations, 39–68. Materials Research Forum LLC, 2021. http://dx.doi.org/10.21741/9781644901175-2.

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The development of technology in the area of material science and nanotechnology is a worldwide concern to researchers for generating a substance by synthesizing nanoparticles with required properties. Carbonaceous materials have gained numerous interests because of their direct electron or charge transfer capacity between active site reception and functionalized nanoparticles without involvement of a mediator. However, among all existing materials, carbon nanotubes have been proven to elite beyond graphene. Carbon nanotubes (CNTs) possess extraordinary electrochemical biosensing and gas sensing due to their specific properties. This encourages researchers to gain new ideas about construction and development of immunosensors, genosensors, enzymatic biosensors and specific gas sensors based on above nanoparticles. Qualification of working electrode via incorporation of two or more of these nanoparticles gives enhanced stability, better sensitivity and functionality to the sensor. This chapter reviews basic information about sensors, their types, functionalization, fabrication mechanisms and applications for future prospective.

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Hamza, M. "Recent Advances in Enzyme Immobilization in Nanomaterials". W Nanomaterial-Supported Enzymes, 1–66. Materials Research Forum LLC, 2022. http://dx.doi.org/10.21741/9781644901977-1.

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This chapter described the advancements in the development of nanostructured supported material and enzyme immobilization techniques. The functionalized nanomaterials extremely affect the inherent mechanical properties and provide the highest biocompatibility and specific nano-environment surrounding the enzymes for improving enzymes stability, catalytic performance, and reaction’s activities. The enzyme immobilization on nanomaterials considerably enhances the robustness and durability of the enzyme for its frequent applications, which reduces the overall expenses of the bio-catalytic process. There are various types of nanomaterials i.e. metal nanoparticles, metal oxide, carbonaceous materials (carbon nanotubes, graphene, and activated carbon), that have been used for the immobilization of the enzyme. So that durability, catalytic activity, leaching of the enzyme, and mechanical steadiness are evaluated for their continual operation.

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Gamage, Ashoka, Thiviya Punniamoorthy i Terrence Madhujith. "Starch-Based Hybrid Nanomaterials for Environmental Remediation". W Starch - Evolution and Recent Advances [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.101697.

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Environmental pollution is becoming a major global issue with increasing anthropogenic activities that release massive toxic pollutants into the land, air, and water. Nanomaterials have gained the most popularity in the last decades over conventional methods because of their high surface area to volume ratio and higher reactivity. Nanomaterials including metal, metal oxide, zero-valent ions, carbonaceous nanomaterials, and polymers function as adsorbents, catalysts, photocatalysts, membrane (filtration), disinfectants, and sensors in the detection and removal of various pollutants such as heavy metals, organic pollutants, dyes, industrial effluents, and pathogenic microbial. Polymer-inorganic hybrid materials or nanocomposites are highly studied for the removal of various contaminants. Starch, a heteropolysaccharide, is a natural biopolymer generally incorporated with other metal, metal oxide, and other polymeric nanoparticles and has been reported in various environmental remediation applications as a low-cost alternative for petroleum-based polymers. Therefore, this chapter mainly highlights the various nanomaterials used in environmental remediation, starch-based hybrid nanomaterials, and their application and limitations.

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Cruz-Navarro, Jesús Antonio, Luis Humberto Mendoza-Huizar, Verónica Salazar-Pereda, Jose Ángel Cobos-Murcia, Fabiola Hernandez-García i Giaan A. Álvarez-Romero. "Metal-Organic Frameworks and their Derived Structures as Catalysts for Electrochemical Sensors". W Advanced Catalysts Based on Metal-organic Frameworks (Part 2), 192–215. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815136029123010008.

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Metal-Organic Frameworks are innovative materials that display interesting redox properties with multiple applications in electroanalytical chemistry and storage purposes. MOFs metal nodes present a redox pair (M2+/M3+) in the presence of alkaline electrolytes, which catalyse the electro-oxidation or a reduction of diverse kinds of molecules. This behaviour is used as the basic principle in the design of electrochemical sensors (modified electrodes) for the smart recognition and quantification of biomolecules and hazardous compounds by using inexpensive techniques such as voltammetry or chronoamperometry. In this regard, MOFs are combined with high conductive nanomaterials to create hybrid composites that increase the electron conductivity to macroscopic levels, and enhance the electro-analytical signal in comparison with the use of pristine MOFs. MOFs are also used to produce other kinds of framework structures such as carbonaceous frameworks embedded with nanoparticles. These derived materials have extensive applications in glucose electrochemical sensors. Herein, the principle of electrocatalysts with MOFs and their derived materials, the elaboration of electrochemical sensors and the recent application of MOFs materials as a catalyst on electrochemical sensors will be presented in this section.

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Streszczenia konferencji na temat "Carbonaceous nanoparticles"

Saikia, Sourav, Jyoti Dutta i Puspendu K. Das. "First Hyperpolarizability of Carbonaceous Nanoparticles". W The 8th World Congress on Recent Advances in Nanotechnology. Avestia Publishing, 2023. http://dx.doi.org/10.11159/icnnfc23.129.

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DeWitt, Matthew, Bryce Whited, Matthias C. Hofmann, Peng Lu, Yong Xu i Marissa Nichole Rylander. "Non-Destructive, Dynamic Imaging of HSP70 Response to Nanoparticle Mediated Photothermal Therapy in a 3D Tumor Mimic". W ASME 2012 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/sbc2012-80874.

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Laser based photothermal therapy is a minimally invasive technique that relies on the absorption of energy by an irradiated tissue sample and results in the deposition of heat to destroy cancerous cells. The inclusion of nanoparticles that act as intense infrared absorbers allows for higher selectivity and additional absorption of laser energy into heat in the desired material. One promising carbonaceous nanoparticle is single walled carbon nanohorns (SWNHs) which have been demonstrated to be effective photoabsorbers [1].

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Bharadwaj, Bharath, Prashant Singh i Roop L. Mahajan. "Thermal Performance of Different Carbonaceous Nanoparticles as Additives to Thermal Paste as an Interface Material". W ASME 2021 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/ipack2021-69254.

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Abstract With increased focus on miniature high power density electronic packages, there is a need for the development of new interface materials with lower thermal resistance. To this end, high conductivity thermal paste or similar thermal interface materials (TIMs), reinforced with superior thermal conductivity materials such as multi-walled carbon nanotubes (MWCNTs), graphene nanoplatelets (GNPs), graphite-derived multilayer graphene (g-MLG) offer an effective strategy to provide efficient paths for heat dissipation from heat source to heat sink. In an earlier paper, we had demonstrated that multilayer graphene derived from coal (coal-MLG) synthesized using our in-house developed one-pot process, has increased presence of phenolic groups on its surfaces, which translates into better dispersion of coal-MLG in silicone thermal paste. In this paper, we first compare the thermal conductance of a high conductivity thermal paste (k = 8.9 W/mK) using coal-MLG as an additive with that realized with other nano additives — MWCNTs, GNPs, and g-MLG. The data shows that coal-MLG as an additive outperforms all the other investigated nano additives in enhancing the thermal performance of the paste. With the coal-MLG as an additive, ∼70% increase in thermal performance was observed as compared to the base thermal paste used. This increase is about 2.5 times higher than that obtained using g-MLG as an additive. We also measured the thermal performance of coal-MLG-based TIM with its different wt.% fractions. The data confirmed our hypothesis that the optimum level of the loading fraction of the additive that can be dispersed in the matrix (paste in this case) before the onset of agglomeration is higher for the coal-MLG (3%) than for the other additives (2%). The implication is further improvement thermal performance with coal-MLG. The data shows the additional thermal enhancement to ∼2X. Finally, since coal-MLG produced by our in-house process is relatively cheaper and more environmentally friendly, we believe that these results would pave the path for enhanced thermal performance with non-silicone thermal pastes at a significantly lower cost. We also expect similar benefits for the silicone-based thermal pastes.

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Daun, K. J., M. Karttunen i J. T. Titantah. "Molecular Dynamics Simulation of Thermal Accommodation Coefficients for Laser-Induced Incandescence Sizing of Nickel Nanoparticles". W ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64747.

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While time-resolved laser-induced incandescence is most often used to characterize the size and concentration of aerosolized carbonaceous particles, it has recently been applied to aerosols containing metal nanoparticles. This calculation requires the thermal accommodation coefficient, however, which is often difficult to determine experimentally. This paper presents a molecular dynamics investigation of the thermal accommodation coefficient between laser-energized nickel nanoparticles immersed in argon, and the underlying the gas-surface scattering physics. The predicted interaction between gas molecules and the laser-energized surface depends strongly on the potential between the gas molecule and a surface atom: a Lennard-Jones 6–12 potential derived using the Lorentz-Berthelot combination rules overestimates the potential well due to a bond-order effect in the nickel, resulting in strong trapping-desorption and near-perfect thermal accommodation. A Morse potential with parameters obtained directly from ab initio free energies predicts a relatively brief interaction between the gas molecule and nickel surface, on the other hand, and a lower thermal accommodation coefficient similar to experimentally-derived values for laser-energized iron nanoparticles in argon reported in the literature.

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Silbajoris, Robert, William P. Linak, Anirudh Kota, Scott Steinmetz, Philip A. Bromberg i James M. Samet. "The Biological Potency Of Carbonaceous Nanoparticles Is Associated With The State Of Oxidation Of Surface Carbon Atoms". W American Thoracic Society 2012 International Conference, May 18-23, 2012 • San Francisco, California. American Thoracic Society, 2012. http://dx.doi.org/10.1164/ajrccm-conference.2012.185.1_meetingabstracts.a1203.

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Diduszko, Ryszard, Robert Nietubyć, Elżbieta Czerwosz i Mirosław Kozłowski. "Short range order in Pd and PdO nanoparticles embedded in carbonaceous matrix studied with the XAFS spectroscopy". W Symposium on Photonics Applications in Astronomy, Communications, Industry and High-Energy Physics Experiments, redaktor Ryszard S. Romaniuk. SPIE, 2014. http://dx.doi.org/10.1117/12.2075019.

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Liu, Tonggang, Jiusheng Bao, Yubin Liu i Zhiyi Yang. "Investigation on Synthesis of Magnetic Fluids Containing Carbon-Coated Iron Nanoparticles". W 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2007. http://dx.doi.org/10.1115/mnc2007-21115.

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Oxidation of nanometer metallic particles has been an obstacle that hinders the application of these materials in magnetic fluids. In this paper, the synthesis of magnetic fluids containing carbon-coated iron nanoparticles have been investigated. The carbon-coated iron nanoparticles have been produced by a W-arc discharge method. The uncapsulated particles and carbonaceous debris have been removed from the product by acid treatment and magnetic separation. The morphology, size distribution and phase composition of the particles have been characterized by TEM and XRD. The results show that the size of the particles is about 10 nm, the core of the particles is iron, and the shell of the particles is onion shaped carbon layers. The mineral oil based magnetic fluids containing carbon-coated iron nanoparticles was synthesized by using complex surfactants (T151 and OAE) to form double surfactant layers on the particle surface. The magnetic fluids with highest magnetization was obtained when the amount of surfactants is 160% of that of carbon-coated particles in weight. The magnetic properties of the encapsulated particles and magnetic fluids were investigated by VSM, their magnetization curves show a lack of hysteresis, characteristic of superparamagnetic material. The saturation magnetization of carbon-coated iron particles is 113.9emu/g, and the saturation magnetization of magnetic fluids containing carbon-coated iron particles (35%wt.) is 32emu/g.

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Kumar, Anand, i Anchu Ashok. "Catalytic Decomposition of Ethanol over Bimetallic Nico Catalysts for Carbon Nanotube Synthesis". W Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0039.

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In this work we investigate the use of NiCo bimetal/oxide as catalyst for hydrogen production from ethanol, with a focus on the deactivation pattern and the nature of the observed carbon deposition. It is well known that sintering and coke deposition during decomposition reaction significantly reduces the activity of the catalysts at higher temperature, by blocking the active sites of the catalysts. During ethanol decomposition reaction, the cleavage of C-C bond produces adsorbed *CH4 and *CO species that further decompose to form carbonaceous compounds. FTIR in-situ analysis was conducted between 50 to 400°C for all the catalysts to understand the reaction mechanism and product selectivity. Cobalt was found to be selective for aldehyde and acetate, whereas bimetallic Ni-Co was selective for the formation of CO at 400°C along with aldehyde. Complete conversion of ethanol was observed at 350°C and 420°C for NiCo and Cobalt respectively indicating an improvement in the rate of conversion when Ni was added to cobalt. The crystallinity, morphology and particle analysis of the used catalyst after reaction were studied using XRD, SEM and TEM respectively. The XRD shows the complete phase change of porous NiCoO2 to NiCo alloy and SEM indicates the presence of fibrous structure on the surface with 91.7 % of carbon while keeping 1:1 ratio of Ni and Co after the reaction. The detailed analysis of carbon structure using HRTEM-STEM shows the simultaneous growth of carbon nano fibers (CNFs) and multiwalled carbon nanotubes (MWCNTs) that were favored on larger and smaller crystallites respectively. Analysis of carbon formation on individual Co catalyst and bimetallic NiCo catalyst shows a clear difference in the initiation pattern of carbon deposition. Metallic Co nanoparticles were found to be more mobile where Co disperses along the catalysts surface, whereas NiCo nanoparticles were relatively less mobile, and maintained their structure.

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Darbandi, Masoud, Majid Ghafourizadeh i Gerry E. Schneider. "The Effect of a Mini-Scale Flame-Holder on Nano-Particulate Soot Aerosol Formation and CO/CO2 Emissions From a Jet Fuel Combustion Chamber". W ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-50082.

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A combustion chamber, burning gaseous kerosene, is simulated to investigate the effects of mini-scale flame-holder geometry and its position on the combustion performance and the resulting nano-particulate soot aerosol, carbon monoxide, and carbon dioxide pollutions. To model the complex process of soot nanoparticle formation including the nucleation, coagulation, surface growth, and oxidation, we use a two-equation soot model to solve the soot mass fraction and soot number density transport equations. Considering a detailed chemical kinetic consisting of 121 species and 2613 elementary reactions, we construct the required flamelets library, i.e. the lookup table, and apply the flamelet combustion model, which solves the transport equations of mixture fraction and its variance. We take into account the turbulence-chemistry interaction using the presumed-shape probability density functions PDFs. Applying the two-equation κ-ε turbulence model with round-jet corrections and suitable wall functions, the transport equations of turbulence kinetic energy and its dissipation rate are solved to close the turbulence closure problem. Since it is required to impose the effects of radiation for the most important radiating species, we include the radiation heat transfer of soot and gases assuming the optically-thin flame consideration. In this regard, the radiation heat transfer is determined locally and only affected by the emissions. We evaluate the achieved solutions through our developed method comparing with the data documented in an experimental test, i.e. a gaseous-kerosene/air turbulent nonpremixed flame. The comparisons are provided for the achieved flame structure, i.e., the experimental data reported on the distributions of mixture fraction, temperature, and soot volume fraction. Next, we consider a disk-type mini-scale flame-holder inside the combustion chamber to study its effects on the flow pattern of reacting flow and the distributions of temperature, soot volume fraction, soot particles diameter, CO, and CO2 mass fractions. Our results show that the mounted flame-holder would increase the inside temperature while reduce the temperature, soot volume fraction, CO, and CO2 mass fractions of the exhaust gases. We also study the geometry and position of mini-scale flame-holder numerically in terms of the average values of temperature, soot volume fraction, soot particles diameter, CO mass fraction, and CO2 mass fraction at the outlet of combustion chamber. Our results indicate that increasing the radius of flame holder would lead to a reduction in carbonaceous emissions, i.e. black carbon, CO, and CO2, and the temperature of exhaust gases. Evidently, a maximum temperature increase inside the combustion chamber would augment the combustion performance. We also show that mounting the flame holder at the lower positions above the fuel nozzle exit would lead to the same consequences. The present study provides good informative advices to the researchers who investigate pollution in aero-engine combustion chambers.

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Raporty organizacyjne na temat "Carbonaceous nanoparticles"

Weimer, Alan. ALD Produced B{sub 2}O{sub 3}, Al{sub 2}O{sub 3} and TiO{sub 2} Coatings on Gd{sub 2}O{sub 3} Burnable Poison Nanoparticles and Carbonaceous TRISO Coating Layers. Office of Scientific and Technical Information (OSTI), listopad 2012. http://dx.doi.org/10.2172/1056841.

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