Relevant bibliographies by topics / Graphite oxide nanoparticles

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers
  5. Reports

Academic literature on the topic 'Graphite oxide nanoparticles'

Author: Grafiati
Published: 4 June 2021
Last updated: 8 February 2022

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Journal articles on the topic "Graphite oxide nanoparticles"

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Mochizuki, Tomofumi, Yamato Hayashi, Jun Fukushima, and Hirotsugu Takizawa. "Synthesis and Characterization of Ag/Graphene Nanocomposites by Solid-Liquid Sonochemical Reactions." Materials Science Forum 804 (October 2014): 119–22. http://dx.doi.org/10.4028/www.scientific.net/msf.804.119.

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In this study, Graphite Oxide (GO) and Ag/Graphene nanocomposites were synthesized by solid-liquid sonochemical reactions easily and briefly. GO was synthesized by means of Hummers method using sonication or stirring. From XRD patterns and FT-IR spectra, chemical and physical effects of ultrasound promoted the oxidation of Graphite. Ag/graphene nanocomposites were synthesized from GO and silver oxide by sonication. UV-vis spectra showed the peaks of Graphene oxide and Ag nanoparticle plasmon resonance absorption. EDX images and electron diffraction patterns confirmed Ag nanoparticles were decorated on Graphene sheets by ultrasound. Using sonication, GO and Ag/Graphene nanocomposites could be synthesized easily in short time.
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Kane, Aichata, Ivaylo Hinkov, Ovidiu Brinza, et al. "One-Step Synthesis of Graphene, Copper and Zinc Oxide Graphene Hybrids via Arc Discharge: Experiments and Modeling." Coatings 10, no. 4 (2020): 308. http://dx.doi.org/10.3390/coatings10040308.

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In this paper, we report on a modified arc process to synthetize graphene, copper and zinc oxide graphene hybrids. The anode was made of pure graphite or graphite mixed with metals or metal oxides. After applying a controlled direct current, plasma is created in the interelectrode region and the anode is consumed by eroding. Continuous and abundant flux of small carbon, zinc or copper species, issued from the anode at a relatively high temperature, flows through the plasma and condenses in the vicinity of a water-cooled cathode leading to few-layered graphene sheets and highly ordered carbon structures. When the graphite rod is filled with copper or zinc oxide nanoparticles, few layers of curved graphene films were anchored with spherical Cu and ZnO nanoparticles leading to a one-step process synthesis of graphene hybrids, which combine the synergetic properties of graphene along with nanostructured metals or semiconducting materials. The as-prepared samples were characterized by Raman spectroscopy, X-ray diffraction (XRD), spatially resolved electron energy loss spectroscopy (EELS), energy filtered elemental mapping and transmission electron microscopy (TEM). In addition to the experimental study, numerical simulations were performed to determine the velocity, temperature and chemical species distributions in the arc plasma under specific graphene synthesis conditions, thereby providing valuable insight into growth mechanisms.
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Zou, Wen Bin, Jun Wu Zhu, and Xin Wang. "Preparation and Characterization of Graphene Oxide-ZnO Nanocomposites." Materials Science Forum 688 (June 2011): 228–32. http://dx.doi.org/10.4028/www.scientific.net/msf.688.228.

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A composite of graphene oxide supported by ZnO nanoparticles (GO-ZnO nanocomposites) was prepared through a simple chemical approach. The lamellar graphite oxide sheets in this composite were exfoliated and decorated randomly by ZnO nanoparticles with a mean size of 20 nm. In addition, the photocatalytic experiments exhibit that the GO-ZnO nanocomposites have a good photocatalytic activity on degradation of methylene blue under UV light irradiation. This method provides a facile and straightforward approach to deposit ZnO nanoparticles onto the graphene oxide sheets and may be readily extended to the preparation of other classes of hybrids based on GO sheets for technological applications.
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Kelani, Hadi, Shelby Weatherbee, Stephen Blama, and Mary Sajini Devadas. "Synthesis and Characterization of 2D-Graphene Oxide-Metal Hybrid Systems with Increased Solubility." MRS Advances 4, no. 38-39 (2019): 2119–26. http://dx.doi.org/10.1557/adv.2019.259.

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ABSTRACTGraphene oxide serves as a precursor to various technologies, which include batteries, biosensors, solar cells, and supercapacitors. Gold nanoparticles exhibit excellent electrochemical and photophysical properties, allowing for electronic absorption and the ability to absorb light energy at the plasmonic wavelength. Palladium nanoparticles are highly sensitive and functional in room temperature, making it an ideal metal for catalytic applications. We report the synthesis of functional graphene oxide from graphite flakes followed by the insertion of gold and palladium nanoparticles through an oleylamine ligand. In this report, the fermi level of graphene oxide (GOx), gold-graphene oxide (Au-GOx), and palladium-graphene oxide (Pd-GOx) was shown to be effectively controlled. Additionally, each system showed complete solubility in ethanol and in the case of Au-GOx, enhanced solubility was seen in tetrahydrofuran as well.
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Jiang, Yan Li, Mei Tian, Ying Hui Yu, Jia Yao Liu, and Shuang Liu. "Preparation and Property of Reduced Graphene for Hummers." Key Engineering Materials 591 (November 2013): 301–4. http://dx.doi.org/10.4028/www.scientific.net/kem.591.301.

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Graphene material has ideal lattice structure and unique electrical, optical and other properties. In the electronics, composite materials, and other fields it has a broad application prospect. In this paper, using the Hummers method, to prepare oxidized graphite and graphene , to optimize the conditions of the preparation of graphite oxide. With two kinds of reductors, glucose and hydrazine hydrate, reduction graphite oxide, and dropped silver ions in the process of reduction. Using XRD, SEM and Raman spectra to character and analyze the products. The result showed that the graphite and silver ions in the oxidation reaction process were both restored by glucose, hydrazine hydrate. This structure that silver nanoparticles are uniformly distributed in the graphene sheet layers, can effectively prevent the reunion of graphene layers, and also upset the rules of the pile of the graphene layers.
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Zaikovskii, Alexey V. "Nanomaterial Production by Arc Discharge Sputtering of Silicon-Graphite and Silica-Graphite Composite Anodes." Key Engineering Materials 805 (June 2019): 94–99. http://dx.doi.org/10.4028/www.scientific.net/kem.805.94.

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This study presents results of an arc discharge synthesis of nanomaterials containing graphene and nanoparticles of SiC ceramic. It has been established that the usage of the silicon-carbon composition of the sputtered electrode in the arc discharge synthesis allows to synthesize graphene structures with silicon carbide nanoparticles with the average size of about 6.2 nm. On the other hand, the usage of the graphite-silica composite electrode also leads to the formation of graphene structures, but at the same time the resulting nanoparticles of silicon carbide have the larger average size of about 9.5 nm. This paper presents the results of the structure analyses of the synthesized materials and offers the explanation for effects of the silicon oxide usage on the increasing in the average size of synthesized SiC nanoparticles.
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Bugárová, Nikola, Zdenko Špitálsky, Matej Mičušík, et al. "A Multifunctional Graphene Oxide Platform for Targeting Cancer." Cancers 11, no. 6 (2019): 753. http://dx.doi.org/10.3390/cancers11060753.

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Diagnosis of oncological diseases remains at the forefront of current medical research. Carbonic Anhydrase IX (CA IX) is a cell surface hypoxia-inducible enzyme functionally involved in adaptation to acidosis that is expressed in aggressive tumors; hence, it can be used as a tumor biomarker. Herein, we propose a nanoscale graphene oxide (GO) platform functionalized with magnetic nanoparticles and a monoclonal antibody specific to the CA IX marker. The GO platforms were prepared by a modified Hummers and Offeman method from exfoliated graphite after several centrifugation and ultrasonication cycles. The magnetic nanoparticles were prepared by a chemical precipitation method and subsequently modified. Basic characterization of GO, such as the degree of oxidation, nanoparticle size and exfoliation, were determined by physical and chemical analysis, including X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX), and atomic force microscopy (AFM). In addition, the size and properties of the poly-L-lysine-modified magnetic nanoparticles were characterized. The antibody specific to CA IX was linked via an amidic bond to the poly-L-lysine modified magnetic nanoparticles, which were conjugated to GO platform again via an amidic bond. The prepared GO-based platform with magnetic nanoparticles combined with a biosensing antibody element was used for a hypoxic cancer cell targeting study based on immunofluorescence.
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Arbuzov, A. A., S. A. Mozhzhukhin, V. B. Son, and B. P. Tarasov. "REDUCED GRAPHITE OXIDE COMPOSITES WITH NICKEL NANOPARTICLES." Alternative Energy and Ecology (ISJAEE), no. 3-4 (April 22, 2016): 50–60. http://dx.doi.org/10.15518/isjaee.2016.03-04.004.

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Gauvin, Florent, Patrice Cousin, and Mathieu Robert. "Effect of modified graphene oxide on the mechanical, thermal, and barrier properties of vinylester." Journal of Composite Materials 52, no. 28 (2018): 3853–64. http://dx.doi.org/10.1177/0021998318770730.

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Graphene, which is a one atom thick layer of graphite, has been considerably studied in the past decade due to its extraordinary physical properties. The development of new routes of synthesis facilitates the use of graphene in polymer nanocomposite. The addition of very small amounts (<1%) of graphene in a polymer matrix does not only increase its thermal and mechanical properties, but it would also enhance permeability, by limiting the diffusion of water through the material. Graphene-polymer nanocomposite would be an interesting alternative to conventional polymer nanocomposite such as nanoclay-polymer nanocomposite. In this study, graphene oxide is synthesized from graphite flakes, following the Tour method, and modified with silane to improve its compatibility with the polymer. Polymer nanocomposite made from vinylester resin and 0.5 wt% graphene oxide is prepared as well as other types of typically used polymer nanocomposite such as graphite flake, silica fume or nanoclay based composite. Samples are soaked in a water bath to study the water absorption of these nanocomposites. Mechanical property measurements and thermal analyses are performed to evaluate the benefit of using graphene oxide. Results show a significant enhancement of the mechanical and thermal properties with a graphene oxide content ten times lower than the one needed with conventional nanoparticles. Moreover, unlike nanoclay-based polymer nanocomposite, graphene oxide does not increase water absorption at saturation.
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Paszkiewicz, Sandra, Małgorzata Nachman, Anna Szymczyk, Zdeno Špitalský, Jaroslav Mosnáček, and Zbigniew Rosłaniec. "Influence of expanded graphite (EG) and graphene oxide (GO) on physical properties of PET based nanocomposites." Polish Journal of Chemical Technology 16, no. 4 (2014): 45–50. http://dx.doi.org/10.2478/pjct-2014-0068.

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Abstract This work is the continuation and refinement of already published communications based on PET/EG nanocomposites prepared by in situ polymerization1, 2. In this study, nanocomposites based on poly(ethylene terephthalate) with expanded graphite were compared to those with functionalized graphite sheets (GO). The results suggest that the degree of dispersion of nanoparticles in the PET matrix has important effect on the structure and physical properties of the nanocomposites. The existence of graphene sheets nanoparticles enhances the crystallization rate of PET. It has been confirmed that in situ polymerization is the effective method for preparation nanocomposites which can avoid the agglomeration of nanoparticles in polymer matrices and improve the interfacial interaction between nanofiller and polymer matrix. The obtained results have shown also that due to the presence of functional groups on GO surface the interactions with PET matrix can be stronger than in the case of exfoliated graphene (EG) and matrix.
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Dissertations / Theses on the topic "Graphite oxide nanoparticles"

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Dhahri, Abdelwaheb. "Synthèse et caractérisation de nanocomposites conducteurs à base de « graphène » et de polysaccharides." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1069/document.

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L'objectif principal de cette thèse a été d'expérimenter de nouvelles voies d'exfoliation des feuillets de graphène dans des matrices polysaccharides telles que la cellulose et le chitosane dopé avec des nanoparticules d'or (Au). Notre stratégie a été d'explorer de nouvelles voies de greffage de molécules et de macromolécules sur des feuillets d'oxyde de graphène (GO). Dans un premier temps, nous avons donc oxydé un graphite commercial par la méthode de Hummers qui est apriori la méthode la plus simple à mettre en oeuvre pour produire une suspension stable de feuillets d'oxyde de graphène totalement exfoliés dans l'eau. L'intérêt de cette oxydation est l'obtention de fonctions acide carboxylique et époxyde susceptibles d'être fonctionnalisées en deux étapes par l'éthylénediamine puis par un polysaccharide tel que la cellulose. En effet, afin d'améliorer la compatibilité du graphite oxydé avec des matrices organiques telle que la cellulose, l'idée est de lui greffer des chaînes polysaccharides. Ces résultats ont permis de mettre en évidence l'exfoliation partielle des feuillets de graphène après fonctionnalisation et l'obtention d'un taux de greffage massique d'environ 35% pour la cellulose. La conductivité électrique des nano-composites correspondants a aussi été étudiée par des mesures diélectriques à des températures variées. L'augmentation de la conductivité électrique après la fonctionnalisation du graphite oxydé a mis en évidence une solvo-thermoréduction simultanément à la fonctionnalisation. Enfin, le dopage de ce matériau par des particules d'or a permis d'obtenir une conductivité électrique de 1.60 10-4 S m-1. En ce qui concerne le matériau composite à base de chitosane, la démarche scientifique a été la même que pour l'analogue cellulose, le taux de greffage massique a été d'environ 68% et nous avons en plus testé son activité catalytique vis-à-vis de la conversion du 4-Nitrophénol en 4-Aminophénol et les résultats obtenus ont été très satisfaisants<br>The main objective of this thesis has been to experiment a new ways of exfoliation of graphene sheets in polysaccharide matrices such as cellulose and chitosan doped with gold nanoparticles (Au). Our strategy was to explore new routes for the grafting of molecules and macromolecules onto graphene oxide (GO). First, we have oxidized commercial graphite by the method of Hummers which is a priori the simplest method to implement to produce a stable suspension of graphene oxide sheets totally exfoliated in water. The advantage of this oxidation is the formation of carboxylic acid and epoxy functional groups onto the graphite surface that can be functionalized in two stages by ethylenediamine and then by a polysaccharide such as cellulose. Indeed, in order to improve the compatibility of graphite oxide with organic matrix such as cellulose, the idea is to graft it onto polysaccharide chains. These results made it possible to demonstrate the partial exfoliation of the graphene sheets after functionalization and to obtain a percentage of grafting of about 35wt% for cellulose. The electrical conductivity of the corresponding nanocomposites has also been studied by dielectric measurements at various temperatures. The increase of the electrical conductivity after the functionalization of graphite oxide showed a solvo-thermo reduction simultaneously with the functionalization. Finally, the doping of this material by gold particles made it possible to obtain an electrical conductivity of 1.60 10-4 S m-1. Concerning chitosan-based composite materials, the scientific approach was the same as cellulose substrate and we obtained a percentage of grafting of 68wt%. In addition, its catalytic activity for the conversion of 4-Nitrophenol to 4-Aminophenol was of high efficiency
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Alshammari, Hanaa Ali. "Heating Power of Coated FeCoV Magnetic Nanoparticles." Wright State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=wright1464477896.

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Chu, Hua-Wei. "Development of solution-processed methods for graphene synthesis and device fabrication." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/44738.

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Various solution-processed methods have been employed in this work. For the synthesis of graphene, a chemical exfoliation method has been used to generate large graphene flakes in the solution phase. In addition, chemical or electro polymerization has been used for synthesizing polyanthracene, which tends to form graphene nanoribbon through cyclodehydrogenation. For the device fabrication, graphene oxide (GO) thin films were deposited from solution phase on the vapor-silanzed aminosilane surface to make semiconducting active layer or conducting electrodes. Gold nanoparticles (AuNPs) were selectively self-assembled from solution phase to pattern nanowires.
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Watson, Venroy George. "Decoration of Graphene Oxide with Silver Nanoparticles and Controlling the Silver Nanoparticle Loading on Graphene Oxide." University of Dayton / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1396879714.

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Costa, Sara Ferreira da. "Funcionalização do óxido de grafite com GLYMO e sua utilização como reforço em nanocompósitos de matriz epoxídica." Universidade do Estado de Santa Catarina, 2015. http://tede.udesc.br/handle/handle/1685.

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Made available in DSpace on 2016-12-08T17:19:27Z (GMT). No. of bitstreams: 1 Sara F Da Costa.pdf: 4048373 bytes, checksum: 81bb7b57c2e425cdcfcc5039f74fae1f (MD5) Previous issue date: 2015-07-27<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>The change of mechanical properties of epoxy resins after the addition of nanoparticles (f. ex. graphite oxide) depends on its concentration, state of dispersion and interaction with the polymer matrix. To improve dispersion and avoid agglomeration of the GO nanoplatelets, due to van der Waals interactions, these nanoparticles can be functionalized using organosilanes as coupling agents. This study aimed to evaluate the effect of functionalization of graphite oxide by 3-glycidoxypropyltrimethoxysilane in the final properties of nanocomposites of epoxy matrix DGEBA with OG and OGS. The functionalized nanoparticles and nanoparticles without functionalization were characterized by spectroscopic and microscopic techniques, CHN elemental analysis and X-ray diffraction. The presence of silicon on the surface of OG was confirmed by analysis of energy dispersive spectroscopy and Fourier transform infrared spectroscopy along with X-ray photoelectron spectroscopy confirmed the functionalization GO with GLYMO by rise of new bands assigned to the Si-O-C bond. Images from scanning electron microscopy and transmission electron microscopy showed that nanoplatelets OG were clustered and after functionalization with silane the nanoplateletes were exfoliated, indicating larger interaction with the epoxy matrix. The dispersion of nanoparticles in the polymer matrix was also studied by microscopy and spectroscopy techniques where noted that the functionalized nanoparticles were well dispersed. To evaluate the effect of the nanoparticles in the mechanical properties, nanocomposites containing 0.1 ,0.25, 0.5 e 1.0 wt% were prepared by in situ polymerization techniques, with the use of a solvent for better dispersion. It was observed that the addition of GO nanoparticles decrease the modulus of elasticity relative to the epoxy resin, and nanocomposites containing 0.25% and 1.0 wt% presented the highest stress decreases. For nanocomposites with GO nanoparticles silanized (GOS) a linear increase of the modulus of elasticity with the mass fraction and maximum stress higher than the epoxy resin and GO nanocomposites was observed, except OGS 1.0wt%, where the maximum stress is lower than of the epoxy resin, which is explained by the existence of larger agglomerates. Thus, the silanized GO provided a more homogeneous dispersion and larger interaction with the epoxy matrix when compared to the GO.<br>A alteração das propriedades mecânicas da resina epoxídica após a adição de nanopartículas de óxido de grafite (OG) depende da concentração, de seu estado de dispersão e da interação com a matriz polimérica. O OG pode formar aglomerados na matriz polimérica devido às interações de van der Waals e, para melhorar a dispersão e distribuição do mesmo na matriz polimérica pode ser feita a funcionalização utilizando agentes de acoplamento, como os organosilanos. Este trabalho teve como objetivo avaliar o efeito da funcionalização via silanização do óxido de grafite pelo organosilano 3-glicidoxipropiltrimetoxisilano nas propriedades finais de nanocompósitos de matriz epoxídica DGEBA com OG e OGS. As nanopartículas com e sem funcionalização foram caracterizadas por técnicas de espectroscopia e microscopia, análise elementar CHN e difração de raios-X. A presença de silício na superfície do OG foi confirmada pela análise de espectroscopia de energia dispersiva e a análise de espectroscopia de infravermelho por transformada de Fourier juntamente com a análise de espectroscopia de fotoelétrons por raios-X confirmou a funcionalização do OG com o GLYMO através do surgimento de novas bandas atribuídas à ligação Si-O-C. As imagens de microscopia eletrônica de varredura de efeito de campo e microscopia eletrônica de transmissão mostraram que nanoplateletes de OG se apresentavam mais empacotados e após a funcionalização com o silano os nanoplateletes estavam esfoliados, indicando maior interação com a matriz epoxídica. A dispersão das nanopartículas na matriz polimérica foi também estudada por técnicas de microscopia e espectroscopia onde se observou que as nanopartículas funcionalizadas estavam mais bem dispersas. Para avaliar o efeito das nanopartículas com e sem funcionalização nas propriedades mecânicas, nanocompósitos contendo 0,1; 0,25; 0,5 e 1,0% (m/m) de nanopartículas foram preparados pelas técnicas de polimerização in situ , com a utilização de solvente para melhorar a dispersão. Foi observado que a adição das nanopartículas de OG diminuiu o módulo de elasticidade e a tensão máxima à tração em relação à resina epoxídica, e que nanocompósitos contendo 0,25% e 1,0% apresentaram as maiores diminuições de tensão. Para os nanocompósitos com as nanopartículas de óxido de grafite silanizado foi observado um aumento linear no módulo de elasticidade com o aumento da porcentagem mássica e apresentaram tensão máxima maior que da resina e dos nanocompósitos com OG, com exceção da porcentagem mássica de OGS 1,0%, onde a tensão máxima foi menor do que a tensão da resina epóxi, o que é explicado pela existência de aglomerados maiores. Assim, o OG silanizado proporcionou uma dispersão mais homogênea e assim, maior interação com a matriz epoxídica quando comparado ao OG.
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Moraes, Ana Carolina Mazarin de 1983. "Graphene oxide and graphene oxide functionalized with silver nanoparticles : antibacterial activity and polymeric composites applications." [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/249034.

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Orientador: Oswaldo Luiz Alves<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Química<br>Made available in DSpace on 2018-08-27T15:35:46Z (GMT). No. of bitstreams: 1 Moraes_AnaCarolinaMazarinde_D.pdf: 5504556 bytes, checksum: ff8566e313e82701925549e2ecd544ab (MD5) Previous issue date: 2015<br>Resumo: O óxido de grafeno (GO) é uma forma quimicamente modificada de grafeno que possui grupos funcionais contendo oxigênio (epóxi, carboxila, carbonila, e hidroxila) distribuídos sobre a base e as bordas de suas folhas. Devido à abundância dos grupamentos oxigenados, o GO tem sido usado como uma plataforma para suportar e estabilizar nanoestruturas metálicas, tais como nanopartículas de prata (NPAgs), visando aplicações biológicas. Além disso, devido à sua excelente capacidade de dispersão e elevada área superficial, o GO tem sido considerado uma carga promissora para a construção de compósitos poliméricos. Neste trabalho, relatamos a síntese do GO e dos nanocompósitos de óxido de grafeno funcionalizado com NPAgs (GO-Ag) os quais podem ser utilizados como agentes antibacterianos de amplo espectro. O GO foi sintetizado por meio do método de Hummers modificado, e o GO-Ag foi preparado através da redução in situ dos íons de prata por citrato de sódio. As folhas de GO foram funcionalizadas com NPAgs esféricas de diâmetro médio de 9,4 nm. Estes nanocompósitos exibiram excelente atividade antimicrobiana contra as principais bactérias em ambiente hospitalar, tais como Escherichia coli, Enterococcus faecalis, Acinetobacter baumannii, e Staphylococcus aureus resistente à meticilina. Os nanocompósitos GO-Ag também foram aplicados como eficazes agentes antimicrobianos a fim de evitar a proliferação bacteriana em membranas de micro e ultrafiltração. Neste sentido, membranas antimicrobianas de acetato de celulose (CA) foram fabricadas a partir da incorporação de GO e GO-Ag na matriz polimérica (CA-GOAg). Após a funcionalização, as membranas permeáveis modificadas com GO-Ag foram capazes de inativar cerca de 90% das células de E. coli em comparação com as membranas de CA não modificadas. Os resultados sugerem que a incorporação de nanocompósitos GO-Ag é uma abordagem promissora para controlar o desenvolvimento da adesão bacteriana em membranas de purificação de água. Com relação à demanda de novos materiais com elevada estabilidade e com capacidade de proteção contra radiação ultravioleta (UV), foram fabricados filmes compósitos transparentes a partir de acetato de celulose e óxido de grafeno. A caracterização físico-química revelou que as folhas de GO estão bem dispersas por toda a matriz polimérica, proporcionando filmes compósitos lisos e homogêneos. Em comparação com os filmes pristinos de CA, os filmes compósitos exibiram melhor capacidade de proteção contra radiação UV combinado com transparência óptica à luz visível, o que reforça a sua aplicação como revestimentos transparentes com proteção UV para alimentos, produtos farmacêuticos, biomédicos, e produtos eletrônicos<br>Abstract: Graphene oxide (GO) is a chemically modified form of graphene that possesses oxygen-containing groups (epoxy, carboxyl, carbonyl, and hydroxyl) distributed on the plane and edges of the sheets. Owing to the abundance of oxygenated groups, GO has been used as a platform to support and stabilize metallic nanostructures such as silver nanoparticles (AgNPs), aiming biological applications. In addition, GO has been considered a promising material for building polymeric composites because of its excellent dispersibility and high surface area. In this work, we report the synthesis of GO and GO functionalized with AgNPs (GO-Ag) for use as a broad-spectrum antibacterial agent. GO was synthesized through the modified Hummers method, and the GO-Ag was prepared through the in situ reduction of silver ions by sodium citrate. Spherical AgNPs with average size of 9.4 nm were found well-dispersed throughout the GO sheets. This nanocomposite exhibited excellent antimicrobial activity against common nosocomial bacteria such as Escherichia coli, Enterococcus faecalis, Acinetobacter baumannii, and methicillin-resistant Staphylococcus aureus. GO-Ag nanocomposites were also applied as an effective antimicrobial agent in order to prevent the bacterial proliferation on micro and ultrafiltration membranes. Cellulose acetate (CA) membranes were then fabricated from the incorporation of GO and GO-Ag into the polymeric matrix (CA-GOAg). After functionalization, the permeable CA membranes modified with GO-Ag were able to inactivate mostly 90% of E. coli cells compared to the non-modified CA membranes. The results suggest that the incorporation of GO-Ag nanocomposites is a promising approach to control biofouling development in water purification membranes. Concerning the demand for novel ultraviolet shielding materials with high stability, transparent and UV-shielding composite films were fabricated by casting a mixture of GO with cellulose acetate (CA). The physicochemical characterization revealed that GO sheets were well-dispersed throughout the polymeric matrix, providing smooth and homogeneous composite films. By comparison with pristine CA films, the composite films displayed an improved UV-shielding capacity combined with optical transparency under visible light, which underscores their application as transparent UV-protective coatings for food, pharmaceutical, biomedical, and electronic products<br>Doutorado<br>Quimica Inorganica<br>Doutora em Ciências
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Karna, Sanjay K. "Enhancement of Light Emission from Metal Nanoparticles Embedded Graphene Oxide." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc849637/.

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A fully oxidized state of graphene behaves as a pure insulating while a pristine graphene behaves as a pure conducting. The in-between oxide state in graphene which is the controlled state of oxide behaves as a semiconducting. This is the key condition for tuning optical band gap for the better light emitting property. The controlling method of oxide in graphene structure is known as reduction which is the mixed state of sp2 and sp3 hybrid state in graphene structure. sp2 hybridized domains correspond to pure carbon-carbon bond i.e. pristine graphene while sp3 hybridized domains correspond to the oxide bond with carbon i.e. defect in graphene structure. This is the uniqueness of the graphene-base material. Graphene is a gapless material i.e. having no bandgap energy and this property prevents it from switching device applications and also from the optoelectronic devices applications. The main challenge for this material is to tune as a semiconducting which can open the optical characteristics and emit light of desired color. There may be several possibilities for the modification of graphene-base material that can tune a band gap. One way is to find semiconducting property by doping the defects into pristine graphene structure. Other way is oxides functional groups in graphene structure behaves as defects. The physical properties of graphene depend on the amount of oxides present in graphene structure. So if there are more oxides in graphene structure then this material behaves as a insulating. By any means if it can be reduced then oxides amount to achieve specific proportion of sp2 and sp3 that can emit light of desired color. Further, after achieving light emission from graphene base material, there is more possibility for the study of non-linear optical property. In this work, plasmonic effect in graphene oxide has been focused. Mainly there are two kinds of plasmon effects have been studied, one is long range (surface) and short range (localized) plasmon. For long range plasmon gold thin film was deposited on partially reduced graphene oxide and for short range plasmon silver nanoparticles have used. Results show that there are 10-fold enhancement in light emission from partial graphene oxide coated with gold thin film while 4-fold enhancement from reduced graphene oxide solution with silver nanoparticles. Chemical method and photocatalytic method have been employed for the reduction of graphene oxide for the study of surface plasmon and localized plasmon. For the characterization UV-Vis spectrometer for absorption, spectrofluorophotometer for fluorescent emission, Raman spectrometer for material characterization, photoluminescence and time resolved photoluminescence have been utilized. Silver and gold nanoparticles are spherical of average size of 80 nm and 40 nm have been used as plasmons.
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Liu, Xiao Jie. "Synthesis of magnetic nanoparticles and carbon based nanohybrid materials for biomedical and energy application." Thesis, Strasbourg, 2014. http://www.theses.fr/2014STRAF055/document.

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Les travaux de cette thèse ont été consacrés à la synthèse de nanoparticules magnétiques d'oxyde de fer et d'oxyde de cobalt et de nanoparticules coeur-coquille constituées d'un coeur d'oxyde de fer recouvert d'oxyde de cobalt et à l'élaboration de nanomatériaux - composites nanostructures carbonées/nanoparticules d'oxyde métallique - pour des applications dans le domaine biomédical et celui de l'énergie. Pour la synthèse des NPs, la forme et la taille des NPs sont fortement dépendantes des conditions de réaction (nature des ligands, des solvants, température de réaction ... ) , ce qui affecte leurs propriétés magnétiques. De plus, des simulations ont montré que les chaînes de stéarate peuvent désorber plus facilement les atomes de fer que les atomes de cobalt et se libérer pour former des germes, ce qui pourrait expliquer le comportement distinctif entre les deux complexes. Ces nanoparticules magnétiques ont été synthétisées à l'intérieur de nanotubes de carbone en deux étapes aboutissant à des taux de remplissage très importants. Après fonctionnalisation, ces nanocomposites ont été introduits dans de cellules tumorales et ont été magnétiquement manipulées. Ils se sont révélés être très efficaces en tant qu'agents de contraste en IRM mais également dans le domaine de l'hyperthermie (activation sous éclairage dans le domaine de !'Infrarouge proche). Enfin, de nouveaux composites à partir de nanoparticules de Nb20 5 et de graphène (ou NTCs) ont été synthétisés et des résultat~prometteurs ont été obtenus dans des tests de batterie lithium-ion : leur utilisation en tant qu'anode a permis d'obtenir des capacités réversibles de 260 mAh/g<br>This thesis was focused on the synthesis of magnetic nanoparticles of iron oxide and cobalt oxide and core-shell nanoparticles, consisting of a cobalt oxide coated iron oxide and on the development of composite nanomaterials - nanostructures carbon /metal oxide nanoparticles - for applications in the biomedical field and the energy. For the synthesis of NPs, the shape and size of NPs are dependent of the reaction conditions, which further affect their magnetic properties. Meanwhile, simulation showed that stearate chains can desorb more easily from iron atoms and release to form seeds than from cobalt atoms, which might explain distinctive behavior between the bath complexes. Regarding nanostructures carbon/metal oxide nanoparticles hybrid materials, the properties of the filled magnetic CNTs as heat mediator for photothermal ablation and as contrast agent for MRI were then evaluated and promising results have been obtained. Last, new composite materials (Nb205 nanoparticles/graphene or NTCs) were synthesized and promising results were obtaines in lithium battery tests : their use as anode allowed obtaining reversible capacities of 260 mAh/g
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Karna, Sanjay K. "Enhancement of Light Emission from Metal Nanoparticles Embedded Graphene Oxide." Thesis, University of North Texas, 2005. https://digital.library.unt.edu/ark:/67531/metadc849637/.

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A fully oxidized state of graphene behaves as a pure insulating while a pristine graphene behaves as a pure conducting. The in-between oxide state in graphene which is the controlled state of oxide behaves as a semiconducting. This is the key condition for tuning optical band gap for the better light emitting property. The controlling method of oxide in graphene structure is known as reduction which is the mixed state of sp2 and sp3 hybrid state in graphene structure. sp2 hybridized domains correspond to pure carbon-carbon bond i.e. pristine graphene while sp3 hybridized domains correspond to the oxide bond with carbon i.e. defect in graphene structure. This is the uniqueness of the graphene-base material. Graphene is a gapless material i.e. having no bandgap energy and this property prevents it from switching device applications and also from the optoelectronic devices applications. The main challenge for this material is to tune as a semiconducting which can open the optical characteristics and emit light of desired color. There may be several possibilities for the modification of graphene-base material that can tune a band gap. One way is to find semiconducting property by doping the defects into pristine graphene structure. Other way is oxides functional groups in graphene structure behaves as defects. The physical properties of graphene depend on the amount of oxides present in graphene structure. So if there are more oxides in graphene structure then this material behaves as a insulating. By any means if it can be reduced then oxides amount to achieve specific proportion of sp2 and sp3 that can emit light of desired color. Further, after achieving light emission from graphene base material, there is more possibility for the study of non-linear optical property. In this work, plasmonic effect in graphene oxide has been focused. Mainly there are two kinds of plasmon effects have been studied, one is long range (surface) and short range (localized) plasmon. For long range plasmon gold thin film was deposited on partially reduced graphene oxide and for short range plasmon silver nanoparticles have used. Results show that there are 10-fold enhancement in light emission from partial graphene oxide coated with gold thin film while 4-fold enhancement from reduced graphene oxide solution with silver nanoparticles. Chemical method and photocatalytic method have been employed for the reduction of graphene oxide for the study of surface plasmon and localized plasmon. For the characterization UV-Vis spectrometer for absorption, spectrofluorophotometer for fluorescent emission, Raman spectrometer for material characterization, photoluminescence and time resolved photoluminescence have been utilized. Silver and gold nanoparticles are spherical of average size of 80 nm and 40 nm have been used as plasmons.
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Dywili, Nomxolisi. "Polyanilino-graphene oxide intercalated with platinum group metal nanocomposites, for application as novel supercapacitor materials." University of the Western Cape, 2014. http://hdl.handle.net/11394/4453.

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>Magister Scientiae - MSc<br>Supercapacitors are one of the important subjects concerning energy storage which has proven to be a challenge in this country. Currently, the electrodes of most commercial supercapacitor are made of carbon which is known to be inexpensive and has high resistance to corrosion. These carbon based supercapacitors operate under EDLC. They offer fast charging/discharging rates and have the ability to sustain millions of cycles without degrading. With their high power densities, they bridge the gap between batteries which offer high energy densities but are slow in charging/discharging and conventional dielectric capacitors which are very fast but having very low energy densities. The objective of this work was to develop a high performance supercapacitor using polyanilino-graphene oxide intercalated with platinum group metal nanocomposites. Specific capacitance of each material was investigated with the objective of ascertaining the material that has the best capacitance. In this work, GO was functionalized with aniline and intercalated with Pt, Pd and Pd-Pt nanocomposites. The nanomaterials were characterized with FTIR, Ultravioletvisible (UV-visible) spectroscopy, high resolution scanning electron microscopy (HRSEM), high resolution transmission electron microscopy (HRTEM), energy dispersive x-ray microanalysis (EDS) and X-ray diffraction (XRD) analysis. The composites were tested for possible application as supercapacitor materials using potentiostatic-galvanostatic constant current charge/discharge. The synthesized materials had good electronic, mechanical, optical, physical etc. properties as proven by the various characterization techniques but they proved not to be ideal for application as supercapacitor materials. The materials tested negative when tested for both anodic and cathodic materials therefore we can conclude that the materials are not good supercapacitor materials and therefore cannot be used in application as novel as supercapacitors.
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Book chapters on the topic "Graphite oxide nanoparticles"

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John, Neena S., K. Bramhaiah, Indu Pandey, and C. Kavitha. "Films of Reduced Graphene Oxide-Based Metal Oxide Nanoparticles." In Nanoelectronic Materials and Devices. Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-7191-1_3.

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Rozhdestvenska, Ludmila, Kateryna Kudelko, Vladimir Ogenko, et al. "Filtration Membranes Containing Nanoparticles of Hydrated Zirconium Oxide–Graphene Oxide." In Springer Proceedings in Physics. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-51905-6_51.

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Vélez, Germán Y., Armando Encinas, and Mildred Quintana. "Immobilization of Metal and Metal Oxide Nanoparticles on Graphene." In Functionalization of Graphene. Wiley-VCH Verlag GmbH & Co. KGaA, 2014. http://dx.doi.org/10.1002/9783527672790.ch8.

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Barui, Ayan Kumar, Arpita Roy, Sourav Das, Keerti Bhamidipati, and Chitta Ranjan Patra. "Therapeutic Applications of Graphene Oxides in Angiogenesis and Cancers." In Nanoparticles and their Biomedical Applications. Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-0391-7_6.

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Muhd Zaimi, Nurul Humaira, Amirjan Nawabjan, Shaharin Fadzli Abdul Rahman, and Siti Maherah Hussin. "Effect of Graphene Oxide Nanoparticles on Thermal Properties of Paraffin Wax." In Lecture Notes in Electrical Engineering. Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2317-5_64.

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Polichetti, T., M. L. Miglietta, B. Alfano, et al. "Fabrication and Characterizations of Pristine and Metal Oxide Nanoparticles Decorated Graphene Sheets." In Lecture Notes in Electrical Engineering. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37558-4_56.

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Aniyery, Rohit Babu, Anita Gupta, Bharti Sharma, et al. "Graphene Doped Ferric Oxide Nanoparticles as a Competent Adsorbent for Water Purification." In Springer Proceedings in Physics. Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-8625-5_25.

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Sefadi, J. S., M. J. Mochane, T. P. Gumede, N. J. Malebo, and T. C. Mokhena. "Graphene-Metal Oxide Nanoparticles on Piezoelectric and Pyroelectric Effect of Polyvinylidene Fluoride (PVDF)." In Handbook of Polymer and Ceramic Nanotechnology. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-10614-0_34-1.

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Sefadi, J. S., M. J. Mochane, T. P. Gumede, N. J. Malebo, and T. C. Mokhena. "Graphene-Metal Oxide Nanoparticles on Piezoelectric and Pyroelectric Effect of Polyvinylidene Fluoride (PVDF)." In Handbook of Polymer and Ceramic Nanotechnology. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-40513-7_34.

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Hameed, Abdulrahman Shahul. "Graphene Wrapped Fe3O4 Nanoparticles as Stable and High Performance Anodes for Lithium Ion Batteries." In Phosphate Based Cathodes and Reduced Graphene Oxide Composite Anodes for Energy Storage Applications. Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2302-6_8.

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Conference papers on the topic "Graphite oxide nanoparticles"

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Liu, Bingfei, Qi Wang, Tian Tian, Guoming Mao, Hao Liu, and Xiao Min Ren. "Graphite oxide-coated Au nanoparticles for improved SERS sensing." In SPIE/COS Photonics Asia, edited by Hongxing Xu, Satoshi Kawata, David J. Bergman, and Xing Zhu. SPIE, 2016. http://dx.doi.org/10.1117/12.2245991.

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Quoc Cuong Do, Chungman Moon, Seokoh Ko, Seoktae Kang, Am Jang, and Dong-Hoon Kim. "Hydrothermal decoration of iron oxide nanoparticles on expanded graphite for adsorptional of phosphorus." In 2015 IEEE 15th International Conference on Nanotechnology (IEEE-NANO). IEEE, 2015. http://dx.doi.org/10.1109/nano.2015.7388972.

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Naskar, Hemanta, Barnali Ghatak, Sudip Biswas, Bipan Tudu, Rajib Bandyopadhay, and Panchanan Pramanik. "Electrochemical Detection of Capsaicin Using Yttrium Oxide Nanoparticles Modified Graphite Paste Electrode (Y2O3/GPE)." In 2019 IEEE International Symposium on Olfaction and Electronic Nose (ISOEN). IEEE, 2019. http://dx.doi.org/10.1109/isoen.2019.8823183.

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Alammar, Khalid N., and Lin-wen Hu. "Laminar Flow and Heat Transfer Characteristics of Colloid Suspensions in Water: A Numerical Study." In ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/ht2009-88214.

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Numerical analysis is performed to examine axisymmetric laminar flow and heat transfer characteristics of colloidal dispersions of nanoparticles in water (nanofluids). Effect of volume fraction on flow and heat transfer characteristics is investigated. Four different materials, Alumina, Copper, Copper Oxide, and Graphite are considered. Heat transfer and property measurements were conducted previously for Alumina nanofluid. The measurements have shown that nanofluids can behave as homogeneous mixtures. It is found that oxide-based nanofluids offer the least heat transfer enhancement compared to elements-based nanofluids. When normalized by friction pressure drop, it is shown that graphite can have the highest effective heat transfer enhancement. For a given volume flow rate, all nanofluids exhibited linear increase in heat transfer enhancement with increasing colloids volume fraction, up to 0.05.
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Kim, Kyung Mo, Seung Won Lee, and In Cheol Bang. "Reflood Heat Transfer in SiC and Graphene Oxide Coated Tubes." In ASME 2013 4th International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/mnhmt2013-22048.

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Quenching experiments were conducted to investigate the effect of nanoparticle deposition on boiling heat transfer during rapid quenching in long vertical tubes. SiC and graphene oxide (GO) nanoparticles were deposited by boiling 0.01 vol% SiC/water and GO/water nanofluids in the vertical tube for 600 and 900 s to observe the repeatability of the nanoparticle deposition. Reflood tests were performed by passing water through bare tube and nanoparticle-coated tube at a constant flow rate (3 cm/s). Quenching curves (temperature vs. time) and saturated boiling curves were obtained at atmospheric pressure. We observed a more enhanced cooling performance in nanoparticle-coated tubes. The quenching time of tubes coated with SiC nanoparticles for 600 and 900 s were reduced by more than 20 and 25 s, respectively, compared to that of the bare tube. For the tubes boiled with GO nanoparticles for 600 and 900 s, the quenching times decreased by 10 and 12 s, respectively, compared to that of the bare tube. Scanning Electron Microscopy (SEM) images were acquired, and the contact angles were measured to observe the effects of surface structures and wettability on the cooling performance.
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Padgurskas, J., G. Reškevičius, J. Zicans, R. Merijs Meri, and I. Bochkov. "Mechanical and Tribological Properties of Self-Lubricating Nanocomposites Based on POM." In BALTTRIB 2015. Aleksandras Stulginskis University, 2015. http://dx.doi.org/10.15544/balttrib.2015.28.

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Self-lubricating polymer composite are used more and more in tribological applications. Parts from these composite are good alternatives where conventional elements cannot be employed easily, for example in medical equipment, food industry. They have several advantages in comparison to metal ones: low weight, often no lubrication is required, low noise level, excellent mechanical damping effect, favorable friction etc. Self‐lubrication is characterized by ability to transfer microscopic amounts of material to the mating surface. This transfer process creates a film that provides lubrication and reduces friction over the length [1-2]. This paper focuses on mechanical properties: tensile strength, flexural strength, impact resistance, hardness, density and tribological properties results derived by bloc-on-ring tests. Investigations of friction and wear resistance of polymers and polymers with additives, using the SMC-2 device has been carried out in the present work. Used basic material (POM) and two types of nanoparticles (copper oxide and expanded graphite) by mixing them with five different concentrations (0 %; 0.5 %; 3 %; 7.5 % and 15 %) by volume. The influences of parameters like normal load, speed and time were considered variable value in the wear tests.
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Bas, Salih Zeki, Mustafa Ozmen, and Salih Yildiz. "Electrochemical H2O2 sensor based on graphene oxide-iron oxide nanoparticles composite." In 2017 IEEE 7th International Conference "Nanomaterials: Application & Properties" (NAP). IEEE, 2017. http://dx.doi.org/10.1109/nap.2017.8190318.

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Yadav, Rishikesh, P. S. Khare, and Devendra K. Pandey. "Structure of graphene oxide dispersed with ZnO nanoparticles." In LIGHT AND ITS INTERACTIONS WITH MATTER. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4898276.

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Ali, Abdallah Y. M., Mohammed Fuseini, Essam M. Abo-Zahhad, M. F. El-Kady, and A. H. El-Shazly. "Pressure Drop Study in Cylindrical Microchannels: Using Graphene Oxide and Magnesia Nanofluids." In ASME 2020 Fluids Engineering Division Summer Meeting collocated with the ASME 2020 Heat Transfer Summer Conference and the ASME 2020 18th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/fedsm2020-20352.

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Abstract The pressure drop and friction factor for the flow in horizontal smooth microtubes were investigated experimentally over a wide variety of Reynolds numbers in the laminar region under hydrodynamically fully developed conditions. The plain pipes are fabricated from 316 stainless steel and provided by (Swagelok Co., USA) with inner diameters of 0.770 mm and 0.510 mm and the length is 500 mm for both microchannels. For this purpose, graphene oxide (GO) nanosheets and magnesium oxide (MgO) nanoparticles were synthesized then characterized using standard methods such as X-ray powder diffractometer (XRD) and Transmission Electron Microscope (TEM). The prepared GO and MgO nanomaterial were added to distilled water to prepare nanofluids with mass fractions of 0.25, 0.5, 0.75, and 1 wt.% as working fluids and passes through one end of the microchannel to the other by a magnetically coupled gear programmable pump with variable speed that drives it. This study predicts the behavior of fluid flow in the microchannel for the range of dimensions used. Comparisons of pressure drop characteristics are given in terms of nanoparticle mass fractions and tube diameters. As a result, MgO nanofluids recorded higher pressure drop with an increase in the concentration of the nanofluids due to its higher viscosity followed by GO nanofluids.
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Elshawaf, Mohamed. "Consequence of Graphene Oxide Nanoparticles on Heavy Oil Recovery." In SPE Kingdom of Saudi Arabia Annual Technical Symposium and Exhibition. Society of Petroleum Engineers, 2018. http://dx.doi.org/10.2118/192245-ms.

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Reports on the topic "Graphite oxide nanoparticles"

1

Attias, Andre-Jean, Kwang-Sup Lee, and Alex K. Jen. Coupling Graphene Sheets with Iron Oxide Nanoparticles for Energy Storage and Microelectronics. Defense Technical Information Center, 2015. http://dx.doi.org/10.21236/ada636883.

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