Relevant bibliographies by topics / Expanded graphite

Academic literature on the topic 'Expanded graphite'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Expanded graphite"

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Wang, Meng Lu, and Li Ji. "Expansion Mechanism of Expandable Graphite Formed by Natural Graphite with Different Particle Size." Advanced Materials Research 499 (April 2012): 16–19. http://dx.doi.org/10.4028/www.scientific.net/amr.499.16.

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Using three natural graphites with different particle sizes, 80, 50 and 35 mesh, as raw material, three expanded graphites were prepared by irradiating expandable graphite in a microwave oven. Results show that the particle size of natural graphite influences strongly the expansion ratio of expanded graphite, and the larger the particle size, the larger the expansion ratio. In addition, the expansion mechanism of expandable graphite is discussed.
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Chao, Chunyan, Ming Gao, and Shun Chen. "Expanded graphite." Journal of Thermal Analysis and Calorimetry 131, no. 1 (January 9, 2017): 71–79. http://dx.doi.org/10.1007/s10973-016-6084-4.

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Liu, Li Lai, Mao Zhong An, Shan Chao Xing, Xiao Jun Shen, Chen Yang, and Xin Long Xu. "Preparation of Graphene Oxide Based on Expanded Graphite." Advanced Materials Research 881-883 (January 2014): 1083–88. http://dx.doi.org/10.4028/www.scientific.net/amr.881-883.1083.

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Graphene oxide with high degree of oxidation and peelable has been prepared by two-step oxidation method used large flake graphite. The expanded graphite was prepared firstly and then prepared graphene oxide via further oxidation. The influence of oxidation time, oxidant dosage and high temperature reaction on the structure and degree of oxidation were studied. The morphology and structure of graphene oxide were characterized by X-ray diffraction, fourier transform infrared spectra, scanning electron microscope and transmission electron microscope. It was found that high degree of oxidation and large specific surface area graphene oxide was prepared at the ratio of sulfuric acid and expanded graphite was 75 mL : 1 g, the ratio of potassium permanganate and expanded graphite was 4 g : 1 g and the oxidation time at 35 °C was 24 h. This technology is simple without high-temperature reaction process, and solved the problem of low oxidation efficiency when used the large flake graphite as raw materials.
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Ji, Li, and Meng Lu Wang. "Effect of Particle Size of Natural Graphite on Methyl Blue Sorption Behavior of Expanded Graphite." Advanced Materials Research 499 (April 2012): 12–15. http://dx.doi.org/10.4028/www.scientific.net/amr.499.12.

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Using three natural graphites with different particle sizes, 80, 50 and 35 mesh, as raw material, expanded graphite was prepared by rapidly heating expandable graphite in a muffle and by irradiating it in a microwave oven, respectively. The resulting expanded graphites were used for adsorbing methyl blue in water. The results show that the removal rate of methyl blue is influenced by the treatment method of solution, the particle size of natural graphite and expansion method of expandable graphite. After selection of desired operation parameters, a higher removal rate is achieved.
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Hoang Thi, Chien, Ly Vu Thi Huong, Thao Tran Thi, Thuy Vu Thi, Ngan Nguyen Thi, Thanh Nguyen Hai, and Tan Vu T. "Synthesis of Expanded Graphite: Effect of the graphite flake size on adsorption capacities to Methylene Blue." Vietnam Journal of Catalysis and Adsorption 10, no. 3 (June 30, 2021): xx. http://dx.doi.org/10.51316/jca.2021.046.

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For the first time, the expansion grade of graphite was studied through the effect of the flake size. The result shown the larger flake size exhibits a higher expansion grade. In addition, the more expanded material, the higher specific surface area can be obtained. The synthesized expanded graphites were used for the adsorption of methylene blue. The expanded graphite with the highest expansion grade displayed the highest adsorption capacity due to its specific surface area.
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Yue, Xue Qing, Hua Wang, Wei Ma, and Jun Shuang Tian. "Preparing Graphite Nanosheets by Sonicating Expanded Graphite." Applied Mechanics and Materials 552 (June 2014): 353–56. http://dx.doi.org/10.4028/www.scientific.net/amm.552.353.

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Natural Graphite Flakes were Treated by Intercalating, Water-Washing, Drying and Expanding, Forming Expanded Graphite. Graphite Nanosheets were Prepared by Sonicating Expanded Graphite in a Liquid Medium. the Corresponding Products were Characterized by Scanning Electron Microscope. the Results Show that the Graphite Nanosheets as-Prepared have an Average Diameter of 16μm and an Average of Thickness of 25 Nm.
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Roh, Il-Pyo, Hyun-Joon Yim, Myung-Chul Kang, Chan-Hyuk Rhee, and In-Bo Shim. "Synthesis and Magnetic Properties of Expanded Graphite Oxide/Magnetic Nanoparticle Composite." Journal of the Korean Magnetics Society 22, no. 1 (February 29, 2012): 11–14. http://dx.doi.org/10.4283/jkms.2012.22.1.011.

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Давыдова, Алина Александровна, Елена Владимировна Ракша, Оксана Николаевна Осколкова, Виктория Валерьевна Гнатовская, Петр Владимирович Сухов, Ольга Михайловна Падун, Валентина Александровна Глазунова, et al. "FEW-LAYER GRAPHENE PARTICLES BASED ON THERMALLY EXPANDED COINTERCALATE OF GRAPHITE NITRATE WITH ACETIC AND FORMIC ACIDS." Physical and Chemical Aspects of the Study of Clusters, Nanostructures and Nanomaterials, no. 12() (December 15, 2020): 580–90. http://dx.doi.org/10.26456/pcascnn/2020.12.580.

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Путем расслоения терморасширенного графита в этиловом и трет-бутиловом спиртах под действием ультразвука получены дисперсии малослойных графеновых наночастиц. Исходный терморасширенный графит получен термической обработкой в ударном режиме нагрева тройного соединения соинтеркалирования нитрата графита с уксусной и муравьиной кислотами. Проведено исследование структурных характеристик соинтеркалата нитрата графита и терморасширенного графита методом рентгенофазового анализа. Микроструктура и морфология полученных графеновых частиц исследованы методом просвечивающей электронной микроскопии. Dispersions of graphene nanoparticles were obtained by liquid phase exfoliation of thermally expanded graphite in ethanol as well as tert-butanol via sonication. Initial thermally expanded graphite was obtained by heat treatment in the shock mode of ternary graphite nitrate intercalation compound with formic and acetic acids. Investigation of the graphite nitrate intercalation compound and thermally expanded graphite structural characteristics by X-ray diffraction analysis has been carried out. The microstructure and morphology of the obtained graphene particles were studied by transmission electron microscopy.
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Zhang, Qian, Xin Bao Gao, and Tian Peng Li. "Effect of Expanded Temperature on Microstructure of Carbon Nanotubes/Expanded Graphite Composites." Advanced Materials Research 716 (July 2013): 373–78. http://dx.doi.org/10.4028/www.scientific.net/amr.716.373.

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Carbon nanotube/expanded graphite composite material was prepared by expanding the mixture of multi-walled carbon nanotubes and expansible graphite under the condition of high temperature. The microstructure and composition was studied by using SEM and XRD. The study shows that the tubular structure of carbon nanotubes in the composite material is changed by high temperature expanding process, and the microstructure is different with different expanding temperature. When the expanding temperature was 900°C, carbon nanotubes transformed, then attached to the surface of expanded graphite flake, so carbon nanotubes and expanding graphite combined strongly; globular carbon nanotubes attached to the surface of expanded graphite flake at the temperature of 700°C, both were combined much more strongly; carbon nanotubes retained the tube structure at the temperature of 500°C, combination was looser due to the simple physical adsorption. The result shows that the choice of expanding temperature has an important effect on microstructure of carbon nanotube/expanded graphite composite material.
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Duan, Wen Yan. "Effect of Expansion Temperature of Expandable Graphite on Anti-Friction Effect of Graphite Nonasheets from Sonicating Expanded Graphite." Applied Mechanics and Materials 80-81 (July 2011): 225–28. http://dx.doi.org/10.4028/www.scientific.net/amm.80-81.225.

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Three graphite nanosheets were prepared by sonicating three expanded graphites that were formed by rapidly heating expandable graphite at 600, 800 and 1000 °C, respectively. The graphite nanosheets were characterized by scanning electron microscope. The anti-friction effects of the graphite nanosheets used as lubricating additives were investigated. The results show that the size of the graphite nanosheets decreases with increasing the temperature of expandable graphite. The graphite nanosheets have an obvious anti-friction effect, and the effect is related to the heating temperature.
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Dissertations / Theses on the topic "Expanded graphite"

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Repasi, Ivett. "Expanded graphite filled polymer composites." Thesis, Queen's University Belfast, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.557649.

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The aim of this project was to produce expanded graphite (EO) and modified EO-filled electrically conductive polymer composites and to investigate the effects of different additive modifications and preparation conditions on the microstructure and electrical properties of these composites. Modifications included the use of dry blending and ultrasound to reduce their size, use of various suspension media and surfactants to stabilize particle suspensions. To compare the effectiveness of different filler modification processes on electrical conductivity, unmodified and treated EO were incorporated into polypropylene (PP) by melt mixing and EO based dispersions were used to make polyvinyl alcohol (PV A) composites by solution casting. The PP composites were made using various processing methods and conditions at filler concentrations up to 12 wt%, while the polyvinyl alcohol samples contained graphite concentrations up to 8 wt%. To analyse the crystalline morphology of sample and the dispersion of the filler in the composites samples were analysed by light and electron microscopy, DSC and X-ray diffraction. TOA was also used to investigate the thermal stability of the composites. It was found that the presence of graphite, significantly changed the crystal morphology of PP. Solution mixed PVA samples showed improved dispersion and the particle size was effectively reduced.
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Cerezo, Frances Therese, and francestherese_cerezo@hotmail com. "Thermal stability and mechanical property of polymer layered graphite oxide composites." RMIT University. Applied Sciences, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080627.161157.

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Polymer composites formed from layered fillers with high surface volume ratio show enhanced reinforcement. Graphite oxide is a high modulus material that can be separated into thin layers with high surface area. The aim of this study is to prepare polymer layered graphite oxide composites using functionalised polyolefin to enhance compatibility with various forms of layered graphite oxide in varying concentration. Functionalised polyolefins reinforced with layered graphite oxides and expanded graphite oxides were prepared using solution blending and melt blending methods. Three different mixing methods with varying shear intensity were employed to prepare polymer layered graphite oxide composites. The crystalline structure, thermal and mechanical properties of the prepared polymer layered graphite oxide composites was studied. Oxidised graphite prepared from the Staudenmaier method and its exfoliated form were dispersed in poly(ethylene-co-methyl acrylate-co-acrylic acid) (EMAA) via solution blending to prepare EMAA layered composites. The thermal stability was determined using thermogravimetric analysis. The EMAA layered composites showed higher thermal stability in comparison with pure EMAA. The mechanical properties of these EMAA layered composites were determined through dynamic mechanical analysis. Shear modulus, yield stress and storage modulus of EMAA in the presence of graphite oxide fillers decreased. A solution blending method was used to prepare poly(propylene-grafted-maleic anhydride) layered expanded graphite oxide composites (PPMA-EGO). Two types of PPMA-EGO were prepared using different mixing methods - low and high shear were employed. The effects of preparative mixing methods on the PPMA-EGO properties were investigated. The mechanical properties of PPMA-EGO obtained from dynamic mechanical analysis indicated that EGO had a reinforcing effect on the elastic behaviour of PPMA-EGO. This is due to strong interfacial adhesion between PPMA and EGO as a result of hydrogen bonding. The elastic behaviour of PPMA-EGO was affected by the surface area of graphite flakes. Low sheared PPMA-EGO elastic behaviour was found to be higher compared with that of high sheared PPMA-EGO. A melt blending method was used to prepare PPMA-EGO with varying EGO concentration. The interconnected network structure of EGO in the PPMA-EGO was not observed as shown by its scanning electron microscopy images. Thermogravimetric analysis of PPMA-EGO indicates increased decomposition temperature of the PPMA matrix. Dynamic mechanical analysis showed enhanced storage modulus of PPMA-EGO. The maximum elastic modulus of PPMA-EGO was observed at 3 %wt of EGO. The electrical conductivity of PPMA-EGO was measured only for EGO concentrations above 2 %wt. The EGO concentration was found to be the most critical factor in the enhancement of the electrical conductivity of PPMA-EGO. Wide angle X-ray diffraction analysis of all polymer layered graphite oxide composites revealed no change in interlayer spacing of graphite layers, indicating the absence of EMAA intercalation in the graphite layers. The crystallisation temperature and crystallinity of all polymer layered graphite oxide composites were determined using differential scanning calorimetry. The results indicated that graphite oxide and expanded graphite oxides acted as nucleating agents in inducing the crystallisation of functionalised polyolefin in the layered composites. However, the degree of crystallinity of functionalised polyolefin decreased in the layered composites.
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Hack, Renata. "Nanocompósitos poliméricos multifuncionais reforçados com grafeno." Universidade do Estado de Santa Catarina, 2014. http://tede.udesc.br/handle/handle/1655.

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Made available in DSpace on 2016-12-08T17:19:22Z (GMT). No. of bitstreams: 1 Renata Hack.pdf: 4507234 bytes, checksum: a9a47eaf8a6524ae5f448abca5062a08 (MD5) Previous issue date: 2014-02-07
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
O grafite natural é uma fonte de baixo custo e é abundante para obtenção de grafeno. O método que se mostrou mais eficiente para a produção de grafeno em larga escala é o método Hummers modificado, que consiste na oxidação do grafite. Com isso, o objetivo principal deste trabalho foi produzir grafeno a partir do grafite natural pelo método de Hummers modificado, além de produzir nanocompósitos de matriz epoxídica reforçada com o grafeno produzido (GP) e o grafeno comercial (GC). Para a produção dos nanocompósitos foi utilizado à resina epoxídica à base de éter diglicidílico do bisfenol A (DGEBA). Foram obtidos nanocompósitos em concentrações de 0,75; 1,00 e 2,00% m/m de GC e GP, com e sem a utilização de solvente THF no processo de preparação. Os resultados obtidos indicaram um alto grau de oxidação do grafite, comprovando assim que o processo foi eficiente. As análises de Raman e FTIR realizadas no GC e GP mostraram que o GP possui as mesmas características do GC. A adição do GC e GP com e sem adição de THF elevou a estabilidade térmica dos nanocompósitos. A alta concentração de nanoreforços e a não utilização de solvente THF em alguns sistemas pode ter contribuído para a formação de aglomerados nestes nanocompósitos, decorrendo assim em uma diminuição do módulo de Young. Através da análise de impedância foi possível verificar que apenas os nanocompósitos com 2%m/m de GP sem THF apresentou percolação dielétrica. Verifica-se que a produção do grafeno a partir do grafite natural possui potencial para aplicação em nanocompósitos estruturais.
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Marinho, Ant?nio Calmon de Ara?jo. "Efeito da adi??o de grafite expandido por microondas nas propriedades t?rmicas, el?tricas e mec?nicas de nanocomp?sitos de matriz ep?xi." Universidade Federal do Rio Grande do Norte, 2014. http://repositorio.ufrn.br:8080/jspui/handle/123456789/12831.

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Made available in DSpace on 2014-12-17T14:07:16Z (GMT). No. of bitstreams: 1 AntonioCAM_DISSERT.pdf: 2526278 bytes, checksum: 858d8dc4858eb48a9d6ce6faab8763d4 (MD5) Previous issue date: 2014-02-26
Universidade Federal do Rio Grande do Norte
Epoxy based nanocomposites with 1 wt % and 3 wt % of nanographite were processed by high shear mixing. The nanographite was obtained by chemical (acid intercalation), thermal (microwave expansion) and mechanical (ultrasonic exfoliation) treatments. The mechanical, electrical and thermal behavior of the nanocomposites was determined and evaluated as a function of the percentage of reinforcement. According to the experimental results, the electrical conductivity of epoxy was not altered by the addition of nanographite in the contents evaluated. However, based on the mechanical tests, nanocomposites with addition of 1 wt.% and 3 wt.% of nanographite showed increase in tensile strength of 16,62 % and 3,20 %, respectively, compared to the neat polymer. The smaller increase in mechanical strength of the nanocomposite with 3 wt.% of nanographite was related to the formation of agglomerates. The addition of 1 wt.% and 3 wt.% of nanographite also resulted in a decrease of 6,25 % and 17,60 %, respectively, in the relative density of the material. Thus, the specific strength of the nanocomposites was approximately 33,33 % greater when compared to the neat polymer. The addition of 1 wt.% and 3 wt.% of nanographite in the material increased the mean values of thermal conductivity in 28,33 % and 132,62 %, respectively, combined with a reduction of 26,11 % and 49,80 % in volumetric thermal capacity, respectively. In summary, it has been determined that an addition of nanographite of the order of 1 wt.% and 3 wt.% produced notable elevations in specific strength and thermal conductivity of epoxy
Nanocomp?sitos a base de resina ep?xi e nanografite foram processados por mistura de alto cisalhamento, com concentra??es de 1 % e 3 % p/p de refor?o. O nanografite foi obtido atrav?s de tratamentos: qu?mico (intercala??o ?cida), t?rmico (expans?o por microondas) e mec?nico (esfolia??o por ultrassom). Os comportamentos mec?nico, el?trico e t?rmico dos materiais obtidos foram analisados em fun??o da porcentagem de refor?o. De acordo com os resultados obtidos, n?o foram verificadas altera??es na condutividade el?trica do ep?xi com a adi??o de nanografite, nos percentuais estudados. Entretanto, com base nos ensaios mec?nicos observou-se que os nanocomp?sitos com adi??o de 1 % p/p e 3 % p/p de grafite expandido apresentaram aumento na resist?ncia ? tra??o de 16,62 % e 3,20 % respectivamente, em rela??o ao pol?mero puro. O menor aumento de resist?ncia mec?nica para os nanocomp?sitos com 3 % p/p de nanografite foi relacionado com a forma??o de aglomerados. A adi??o de 1 % p/p e 3% p/p de nanografite tamb?m resultou em uma diminui??o de 6,25 % e 17,60 %, respectivamente, na densidade relativa do pol?mero. Portanto, a eleva??o da resist?ncia espec?fica dos nanocomp?sitos foi de aproximadamente 33,33% para os dois nanocomp?sitos, em rela??o ao pol?mero puro. A adi??o de 1 % p/p e 3 % p/p de nanografite no material aumentou os valores m?dios de condutividade t?rmica em 28,33 % e 132,62 %, respectivamente, combinado com uma redu??o de 26,11 % e 49,80 %, respectivamente, na capacidade t?rmica volum?trica. Em resumo, verificou-se que uma adi??o de nanografite da ordem de 1 % e 3 % p/p produziram eleva??es not?veis na resist?ncia mec?nica espec?fica e condutividade t?rmica do ep?xi
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Merlin, Kevin. "Caractérisation thermique d'un matériau à changement de phase dans une structure conductrice." Thesis, Nantes, 2016. http://www.theses.fr/2016NANT4004/document.

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La récupération de chaleur fatale est un véritable challenge pour l’amélioration de l’efficacité énergétique. Le stockage par chaleur latente est une solution qui répond à cet enjeu. Nous nous intéressons aux procédés industriels avec un rapport puissance sur énergie élevé. L’un des procédés identifiés est la stérilisation de produits agroalimentaires. Cependant, les matériaux à changement de phase, peu conducteurs, ne permettent pas d’obtenir des puissances thermiques suffisantes pour ces applications. L’amélioration de la surface d’échange ou l’augmentation de la conductivité thermique du matériau sont alors nécessaires. Un premier dispositif expérimental de stockage thermique comparant différentes techniques d’intensification des transferts a été réalisé. Le concept à base de paraffine et de Graphite Naturel Expansé (GNE) s’est montré le plus performant par rapport à des solutions de type ailettes ou poudre de graphite. La caractérisation thermique du matériau composite GNE/paraffine sélectionné a été réalisée par plusieurs méthodes. Des valeurs de conductivité thermique effective de l’ordre 20 W.m-1.K-1 ont été obtenues. Dans un second temps, un démonstrateur de 100kW/6kW.h est dimensionné et réalisé. Ce dispositif testé sur un procédé de stérilisation existant permet une économie d’énergie de 15%, conforme aux prévisions. L’identification de la conductivité thermique plane du matériau et l’influence de la résistance thermique de contact sont réalisées à l’aide d’un dispositif expérimental, couplé à un modèle numérique. Enfin, le développement d’un dispositif de vieillissement permet l’étude de la stabilité thermique de ce matériau
Waste heat recovery is a challenge for the improvement of energy efficiency. Latent heat storage is a solution that addresses this issue. We focus on industrial processes with high energy on power ratios. One of the identified processes is the sterilization of food products. However, phase change materials, which have low thermal conductivities, do not provide sufficient thermal powers for these applications. The improvement of the heat exchange surface or the increase in thermal conductivity of the material are then necessary. A first experimental thermal storage comparing various heat transfer intensification techniques was achieved. The concept based on paraffin and Expanded Natural Graphite (ENG) has proven to be the most efficient compared to solutions using fins or graphite powder. The thermal characterization of the selected composite material ENG/paraffin was performed by several methods. Effective thermal conductivities values of about 20 W.m-1.K-1 were obtained. In a second step, a 100kW/6kW.h demonstrator is designed and realized. This device tested on an existing sterilization process provides an energy saving of 15%, as expected. The identification of the planar thermal conductivity of the composite material and the influence of the thermal contact resistance are carried out using an experimental device, coupled to a numerical model. Finally, an aging device is used to study the thermal stability of this material
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Paulovics, Petr. "Přírodní expandovaný a vločkový grafit jako záporná elektroda lithium-iontového článku." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-376917.

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This diploma thesis deals with an issue of lithium-ion batteries, primarily with negative (anode) electrode materials. Natural graphite in two forms, namely flake and expanded graphite, is used in the thesis as active electrode material. It is concerned with study of their capacity and output characteristics depending on the pressing pressure and discharging current. The first part of thesis consists of theory and describes basic principles and the composition of lithium-ion batteries. Materials, their characteristics used in production and theoretical description of measurement techniques are presented then. The second part of the thesis is focused on production, assembling and measurement of the characteristics of the produced electrodes. The aim of the thesis is finding the effects of changes of pressing pressure on the capacity, stability during cycling and stability at higher loads.
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Redondo, Foj María Belén. "A contribution to the study of the molecular mobility in polymeric materials by Thermal and Dielectric Analysis." Doctoral thesis, Universitat Politècnica de València, 2016. http://hdl.handle.net/10251/59457.

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[EN] The development of new and more complex polymeric materials involves challenging problems to basic sciences. The relationship between structure and molecular dynamics assumes great importance for the future development of novel technologies based on such polymers. Thus, the understanding of how small changes in the chemical structure affect the properties of the material is essential to progress in the technological and scientific area. An in-depth analysis of the molecular mobility leads to establish the structure-properties relationships. On this basis, the main aim of the present work is to study the molecular mobility of two different families of polymeric materials. For this purpose, the experimental techniques mainly used were Differential Scanning Calorimetry (DSC) and Dielectric Relaxation Spectroscopy (DRS). The first family of polymers characterized was a series of chemically cross-linked copolymers composed by Vinylpyrrolidone (VP) and Butyl Acrylate (BA) monomers. In the first place, the influence of the monomer molar ratio (XVP/YBA) on the copolymer properties was studied. Thus, a Fourier Transform Infrared Spectroscopy (FTIR) analysis verified dipole-dipole interactions between amide groups. The influence of these interactions on several parameters related to the molecular mobility was evidenced by the DSC, DRS and Dynamic Mechanical Analysis (DMA) techniques. Secondly, the effect of the cross-link density on the molecular dynamics of 60VP/40BA copolymers was analyzed using DSC and DRS. One single glass transition was detected by DSC measurements. The DRS analysis showed that an increase of the cross-linking produced a typical effect on the alpha process dynamics. However, the beta process, which possessed typical features of pure JG relaxation, unexpectedly lost the intermolecular character for the highest cross-linker content. The fastest gamma process was relatively unaffected. The second family of polymeric materials studied was a series of segmented polycarbonatediol polyurethane (PUPH) modified with different amounts of expanded graphite (EG) conductive filler. Scanning Electron Microscopy (SEM), X-ray diffraction measurements and FTIR analysis demonstrated a homogeneous dispersion of the EG filler in the matrix. DRS was used to study the dielectric properties of the PUPH/EG composites. The dielectric permittivity of the composites showed an insulator to conductor percolation transition with the increase of the EG content (2030 wt%). The addition of expanded graphite to the matrix caused a dramatic increase in the electrical conductivity of ten orders of magnitude, which is an indication of percolative behavior.
[ES] El desarrollo de nuevos materiales poliméricos de mayor complejidad produce un desafío cada vez mayor en el área de las ciencias básicas. La relación entre la estructura y la dinámica molecular resulta de gran importancia para el desarrollo de nuevas tecnologías basadas en estos materiales poliméricos. Así, una mayor comprensión de cómo pequeños cambios en la estructura química afectan a las propiedades de los materiales resulta esencial para el progreso científico y tecnológico. Un análisis en profundidad de la movilidad molecular permite establecer las relaciones estructura-propiedades. Partiendo de esta base, el principal objetivo del presente trabajo es el estudio de la movilidad molecular de dos familias diferentes de materiales poliméricos. Para ello, las técnicas experimentales utilizadas fueron principalmente la Calorimetría Diferencial de Barrido (DSC) y la Espectroscopia de Relajación Dieléctrica (DRS). La primera familia de polímeros caracterizada fue una serie de copolímeros entrecruzados químicamente compuestos por los monómeros Vinilpirrolidona (VP) y Acrilato de Butilo (BA). En primer lugar, se estudió la influencia de la proporción molar de monómero (XVP/YBA) en las propiedades del copolímero. A través de un análisis por Espectroscopia de Infrarrojo por Transformada de Fourier (FTIR), se verificó la existencia de interacciones dipolo-dipolo entre los grupos amida. Mediante el análisis por DSC, DRS y Análisis Dinamomecánico (DMA), se evidenció la influencia de estas interacciones en diferentes parámetros relacionados con la movilidad molecular. En segundo lugar, se analizó el efecto de la densidad de entrecruzamiento en la dinámica molecular de los copolímeros 60VP/40BA usando DSC y DRS. A través de las medidas de DSC se observó una única transición vítrea para todos los entrecruzamientos. El análisis por DRS mostró como el incremento en entrecruzante produjo el típico efecto en la dinámica del proceso alpha, pero sin embargo, el proceso beta, que tenía las características típicas de una relajación JG, perdió de forma inesperada su carácter intermolecular para el mayor contenido en entrecruzante. El proceso gamma no se vio afectado. La segunda familia de materiales poliméricos estudiada fue una serie de poliuretanos segmentados (PUPH) modificados con diferentes cantidades de grafito expandido (EG), utilizado como relleno conductivo (desde 0 a 50% en peso). El análisis de los resultados obtenidos mediante Microscopía Electrónica de Barrido (SEM), Difracción de Rayos X y FTIR demostró la homogénea dispersión del relleno de EG en la matriz de PUPH. La técnica DRS se usó para estudiar las propiedades dieléctricas de los materiales compuestos PUPH/EG. La permitividad dieléctrica de los materiales mostró una transición de percolación desde aislante a conductor al incrementarse el contenido en EG (rango de 20-30% en peso). La adición de grafito expandido a la matriz de PUPH causó un incremento significativo en la conductividad dieléctrica de diez órdenes de magnitud, lo que indica el comportamiento de percolación.
[CAT] El desenvolupament de nous materials polimèrics de major complexitat produeix un desafiament cada vegada major en l'àrea de les ciències bàsiques. La relació entre l'estructura i la dinàmica molecular resulta de gran importància per al desenrotllament de noves tecnologies basades en aquests materials polimèrics. Així, una major comprensió de com petits canvis en l'estructura química afecten a les propietats dels materials, resulta essencial per al progrés científic i tecnològic. Un anàlisis en profunditat de la mobilitat molecular permet establir les relacions estructura-propietats. Partint d'aquesta base, el principal objectiu del present treball és l'estudi de la mobilitat molecular de dues famílies diferents de materials polimèrics. Per a això, les tècniques experimentals utilitzades van ser principalment la Calorimetria Diferencial de Rastreig (DSC) i l'Espectroscòpia de Relaxació Dielèctrica (DRS). La primera família de polímers caracteritzada va ser una sèrie de copolímers entrecreuats químicament compostos pels monòmers Vinilpirrolidona (VP) i Acrilat de Butilo (BA) . En primer lloc, es va estudiar la influència de la proporció molar de monòmer (XVP/YBA) en les propietats del copolímer. A través d'una anàlisi per Espectroscòpia d'Infraroig per Transformada de Fourier (FTIR), es va verificar l'existència d'interaccions dipol-dipol entre els grups amida. Mitjançant l'anàlisi per DSC, DRS i Anàlisi Dinamomecánico (DMA), es va evidenciar la influència d'aquestes interaccions en diferents paràmetres relacionats amb la mobilitat molecular. En segon lloc, es va analitzar l'efecte de la densitat d'entrecreuament en la dinàmica molecular dels copolímers 60VP/40BA mitjançant DSC i DRS. A través de les mesures de DSC es va observar una única transició vítria per a tots els continguts d'agent entrecreuant . L'anàlisi per DRS va mostrar com l'increment en agent entrecreuant va produir l'efecte esperat en la dinàmica del procés alfa. En canvi, el procés beta, que tenia les característiques típiques d'una relaxació JG, va perdre de forma inesperada el seu caràcter intermolecular per al major contingut en agent entrecreuant. El procés més ràpid gamma no es va veure afectat. La segona família de materials polimèrics estudiada va ser una sèrie de poliuretans segmentats (PUPH) modificats amb diferents quantitats de grafit expandit (EG) , utilitzat com a farcit conductiu (des de 0 a 50% en pes). L'anàlisi dels resultats obtinguts per mitjà de Microscòpia Electrònica de Rastreig (SEM), Difracció de Rajos X i FTIR va mostrar la dispersió homogènia del EG en la matriu de PUPH. La tècnica DRS es va utilitzar per a estudiar les propietats dielèctriques dels materials compostos PUPH/EG. La permitivitat dielèctrica dels materials va mostrar una transició de percolació des d'aïllant a conductor amb l'increment de contingut en EG (20-30% en pes). L'addició d'EG a la matriu de PUPH va causar un increment significatiu en la conductivitat dielèctrica, de deu ordes de magnitud.
Redondo Foj, MB. (2015). A contribution to the study of the molecular mobility in polymeric materials by Thermal and Dielectric Analysis [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/59457
TESIS
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Drahokoupil, Petr. "Výzkum záporných elektrod pro lithno-iontové akumulátory." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220105.

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This thesis deals with lithiation of negative electrode li-ion batteries. In this thesis is used several electrode materials: carbon, FeCl3, lithiated carbon electrodes and silicon carbide. Reduction of irreversible capacity lithium-ion batteries leads to increased capacity and also we can use new materials as a positive electrode. Thesis deals with the differences in the properties of materials using lithiation and their use in practice
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McGuire, Paul. "Composing with an expanded instrumental palette." Thesis, Brunel University, 2015. http://bura.brunel.ac.uk/handle/2438/12690.

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This thesis is comprised of a portfolio of musical compositions with accompanying media and a written commentary. In each of the seven compositions, the timbral palettes of musical instruments have been expanded through unconventional physical manipulation. The written commentary presents, in detail, specific examples of how this has been achieved. Alongside descriptions of the work in question, select aspects of other composers' music that approach a similar aesthetic are also referred to. In addition, the fundamental role technology has played in the creation or realisation of certain pieces is addressed. Also included are descriptions of the various customised notational systems used throughout the portfolio. It is outlined how each of these systems has been constructed in a clear and practical manner and, where possible, has incorporated elements derived from the lingua franca in order to communicate the required information as efficiently as possible to the performers.
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Zhang, Xiujuan. "Improvements in the Mechanical Properties of Some Biodegradable Polymers and Bimodal Poly(dimethylsiloxane) Hydrogels and Surface Hydrophilic Treatments." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1240666875.

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Books on the topic "Expanded graphite"

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Tinsley, Kevin. Digital prepress for comic books: Revised, expanded & updated. Brooklyn, NY: Stickman Graphics, 2009.

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Tinsley, Kevin. Digital prepress for comic books: Revised, expanded & updated. Brooklyn, NY: Stickman Graphics, 2009.

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Tinsley, Kevin. Digital prepress for comic books: Revised, expanded & updated. Brooklyn, NY: Stickman Graphics, 2009.

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Barba, Rick. Myst: Official Strategy Guide, Revised and Expanded. Rocklin, Calif: Prima Games, 1995.

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Krebs, Mike. Expander families and Cayley graphs: A beginner's guide. Oxford: Oxford University Press, 2011.

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IFIP WG 5.2 Working Conference on Geometric Modeling for CAD Applications (1986 Rensselaerville, N.Y.). Geometric modeling for CAD applications: Selected and expanded papers from the IFIP WG 5.2 Working Conference, Rensselaerville, NY, USA, 12-14 May 1986. Amsterdam: North-Holland, 1988.

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IFIP WG 5.2/NSF Working Conference on Geometric Modeling (1988 Rensselaerville, N.Y.). Geometric modeling for product engineering: Selected and expanded papers from the IFIP WG 5.2/NSF Working Conference on Geometric Modeling, Rensselaerville, U.S.A., 18-22 September, 1988. Amsterdam: North-Holland, 1990.

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IFIP TC5/WG5.2 Working Conference on Geometric Modeling (1992 Rensselaerville, N.Y.). Geometric modeling for product realization: Selected and expanded papers from the IFIP TC5/WG5.2 Working Conference on Geometric Medeling, Rensselaerville, NY, U.S.A., 27 September-1 October 1992. Amsterdam: North-Holland, 1993.

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IFIP TC5/WG5.2 Working Conference on Geometric Modeling for Product Engineering (1990 Rensselaerville, N.Y.). Product modeling for computer-aided design and manufacturing: Selected and expanded papers from the IFIP TC5/WG5.2 Working Conference on Geometric Modeling for Product Engineering, Rensselaerville, U.S.A., 17-21 June 1990. Amsterdam: North-Holland, 1991.

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Sementsov, Yu I., S. L. Revo, K. O. Ivanenko, and S. Hamamda. Expanded Graphite and Its Composites. PH "Akademperiodyka", 2019. http://dx.doi.org/10.15407/akademperiodyka.397.226.

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Book chapters on the topic "Expanded graphite"

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Voitash, A. A., E. V. Raksha, A. A. Davydova, O. N. Oskolkova, Y. V. Berestneva, A. V. Muratov, A. B. Eresko, et al. "Thermally Expanded Graphite: Sorption Properties and Carbon Nanoparticles Obtaining." In Springer Proceedings in Materials, 47–52. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-76481-4_5.

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Kodryk, Anatoly, Alexander Nikulin, Alexander Titenko, Fedor Kirchu, Yurii Sementsov, Kateryna Ivanenko, Yuliia Grebel’na, Alex Pokropivny, and Ashok Vaseashta. "Hydrocarbons Removal from Contaminated Water by Using Expanded Graphite Sorbents." In Advanced Sciences and Technologies for Security Applications, 523–45. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-76008-3_22.

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Rewolinska, Aleksandra, and Karolina Perz. "Influence of Selected Factors on Static Friction for Combination of Expanded Graphite-Steel." In Lecture Notes in Mechanical Engineering, 451–56. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-68619-6_43.

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Zhu, Mincong, Xin Qing, Kanzhu Li, Wei Qi, Ruijing Su, Jun Xiao, Qianqian Zhang, Dengxin Li, Yingchen Zhang, and Ailian Liu. "Synthesis and Characterization of Eco-friendly Composite: Poly(Ethylene Glycol)-Grafted Expanded Graphite/Polyaniline." In Advances in Computer Science, Environment, Ecoinformatics, and Education, 501–6. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-23321-0_78.

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Barsukov, V. Z., V. G. Khomenko, A. S. Katashinskii, and T. I. Motronyuk. "NEW CONCEPT FOR THE METAL-AIR BATTERIES USING COMPOSITES: CONDUCTING POLYMERS / EXPANDED GRAPHITE AS CATALYSTS." In New Carbon Based Materials for Electrochemical Energy Storage Systems: Batteries, Supercapacitors and Fuel Cells, 89–104. Dordrecht: Springer Netherlands, 2006. http://dx.doi.org/10.1007/1-4020-4812-2_8.

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Vignaud, J.-C., P. Digat, and H. Nowak. "Water And Steam Tightness Tests of Expanded Graphite Static Gaskets for Nuclear Power Plant Steam Generators." In Fluid Sealing, 141–55. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2412-6_10.

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Chen, Huiming, Tao Jiang, Changru Rong, Dan Wang, Xinyan Mi, and Kejin Zhang. "Preparation Technology of Silicon–Carbon Composite Anode Material Based on Expanded Graphite for Lithium-Ion Battery for Vehicles." In Lecture Notes in Electrical Engineering, 207–12. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-8506-2_14.

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Dinker, Abhay, Madhu Agarwal, and G. D. Agarwal. "Modelling and Simulation of Helical Coil Embedded Heat Storage Unit Using Beeswax/Expanded Graphite Composite as Phase Change Material." In Advances in Intelligent Systems and Computing, 411–23. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-9953-8_36.

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Sobolciak, Patrik, Mustapha Karkri, Igor Krupa, and Mariam Al Maadeed. "Storage and Release of Thermal Energy of Phase Change Materials Based on Linear Low Density of Polyethylene, Parafin Wax and Expanded Graphite." In TMS Middle East - Mediterranean Materials Congress on Energy and Infrastructure Systems (MEMA 2015), 395–402. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119090427.ch41.

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Sobolciak, Patrik, Mustapha Karkri, Igor Krupa, and Mariam Al Maadeed. "Storage and Release of Thermal Energy of Phase Change Materials Based on Linear Low Density of Polyethylene, Parafin Wax and Expanded Graphite Applicable in Building Industry." In Proceedings of the TMS Middle East — Mediterranean Materials Congress on Energy and Infrastructure Systems (MEMA 2015), 395–402. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-48766-3_41.

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Conference papers on the topic "Expanded graphite"

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Lai, Qi, Min Zou, Minjie Li, Xueping Luo, and Shifu Zhu. "Absorption Process of Expanded Graphite." In 2010 4th International Conference on Bioinformatics and Biomedical Engineering (iCBBE 2010). IEEE, 2010. http://dx.doi.org/10.1109/icbbe.2010.5517050.

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Reyna, Raul, Mayken Espinoza-Andaluz, and Andres Rigail. "Size oriented morphological properties of expanded graphite." In 2020 IEEE ANDESCON. IEEE, 2020. http://dx.doi.org/10.1109/andescon50619.2020.9272164.

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Lee, Jong Hak, Seong Man Yoo, Dong Wook Shin, J. B. Yoo, J. H. Park, Yu Hee Kim, P. S. Alegaonkar, et al. "Graphene composite using easy soluble expanded graphite: Synthesis and emission parameters." In 2009 22nd International Vacuum Nanoelectronics Conference (IVNC2009). IEEE, 2009. http://dx.doi.org/10.1109/ivnc.2009.5271675.

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Karavaev, Dmitrii. "MECHANICAL PROPERTIES OF EXPANDED GRAPHITE / SILICONE RESIN COMPOSITES." In 14th SGEM GeoConference on NANO, BIO AND GREEN � TECHNOLOGIES FOR A SUSTAINABLE FUTURE. Stef92 Technology, 2014. http://dx.doi.org/10.5593/sgem2014/b61/s24.015.

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Li Minjie and Xiong Ya. "Adsorption properties of expanded graphite on domestic sewage." In 2011 International Symposium on Water Resource and Environmental Protection (ISWREP). IEEE, 2011. http://dx.doi.org/10.1109/iswrep.2011.5893511.

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Revo, S., T. Avramenko, M. Melnichenko, K. Ivanenko, and P. Teselko. "Morphological structure and microhardness of ground thermally expanded graphite." In 2017 IEEE 7th International Conference "Nanomaterials: Application & Properties" (NAP). IEEE, 2017. http://dx.doi.org/10.1109/nap.2017.8190227.

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Karavaev, Dmitrii. "THE TRIBOLOGICAL PROPERTIES OF EXPANDED GRAPHITE / SILICONE RESIN COMPOSITES." In 14th SGEM GeoConference on NANO, BIO AND GREEN � TECHNOLOGIES FOR A SUSTAINABLE FUTURE. Stef92 Technology, 2014. http://dx.doi.org/10.5593/sgem2014/b61/s24.026.

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Bogdan, O. P., O. V. Muravieva, and D. V. Zlobin. "Acoustic density testing of blanks made of thermally expanded graphite." In MECHANICS, RESOURCE AND DIAGNOSTICS OF MATERIALS AND STRUCTURES (MRDMS-2020): Proceeding of the 14th International Conference on Mechanics, Resource and Diagnostics of Materials and Structures. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0036633.

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Wang, Chih-Feng, Pei-Rung Hung, Chih-Lin Wu, Yi-Jung Tsai, Yan-Yu Chang, Kuo-Jung Lee, and Ping-Feng Yang. "Synthesis and thermal conductivity of expanded graphite (EG)/polymer composites." In 2018 International Conference on Electronics Packaging and iMAPS All Asia Conference (ICEP-IAAC). IEEE, 2018. http://dx.doi.org/10.23919/icep.2018.8374653.

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Korobiichuk, Igor. "HEAT ACCUMULATING BLOCKS BASED ON THE PYROPHYLLITE AND THERMALLY EXPANDED GRAPHITE." In 16th International Multidisciplinary Scientific GeoConference SGEM2016. Stef92 Technology, 2016. http://dx.doi.org/10.5593/sgem2016/b12/s04.140.

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