The Effect of Pressure on the Synthesis of Graphene Layers in the Flame

Приходько, Н. Г.; Auyelkhankyzy, M.; Lesbayev, B. T.; Mansurov, Zulkhair A.

doi:10.4236/msce.2014.21003

Cited by 5 publications

(6 citation statements)

References 5 publications

(7 reference statements)

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“…The shift to a lower 2D wave number indicated a decrease in the number of layers. [81][82][83] These results are in line with the particle sizes of the GF tt and GnP tt obtained by I D /I G mapping (Figure 3b) and SEM imaging (Figure 2d,e).…”

Section: Hybrid Gf Tt -Gnp Tt Compositesupporting

confidence: 88%

“…The observed Raman spectrum agrees with previously reported data. [80][81][82][83] The I D /I G mapping (Figure 3b) indicated the coexistence of large GF tt particles (≈50 μm in size, Figure 2d), with a low edge defect density, and exfoliated small GnP tt particles (≈10 μm in size, Figure 2e), with a higher edge defect density, [84,85] in agreement with the SEM results (Figure 2c). As expected, the relatively smaller GnP tt particles had a higher edge concentration than the GF tt particles and, consequently, a higher I D /I G ratio.…”

Section: Hybrid Gf Tt -Gnp Tt Compositesupporting

confidence: 84%

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Thermally Conductive Molten Salt for Thermal Energy Storage: Synergistic Effect of a Hybrid Graphite‐Graphene Nanoplatelet Filler

Lavi,

Ohayon‐Lavi,

Leibovitch

et al. 2023

Global Challenges

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Renewable energy technologies depend, to a large extent, on the efficiency of thermal energy storage (TES) devices. In such storage applications, molten salts constitute an attractive platform due to their thermal and environmentally friendly properties. However, the low thermal conductivity (TC) of these salts (<1 W m−1 K−1) downgrades the storage kinetics. A commonly used method to enhance TC is the addition of highly conductive carbon‐based fillers that form a composite material with molten salt. However, even that enhancement is rather limited (<9 W m−1 K−1). In this study, the partial exfoliation of graphite to graphene nanoplatelets (GnP) in a molten salt matrix is explored as a means to address this problem. A novel approach of hybrid filler formation directly in the molten salt is used to produce graphite–GnP–salt hybrid composite material. The good dispersion quality of the fillers in the salt matrix facilitates bridging between large graphite particles by the smaller GnP particles, resulting in the formation of a thermally conductive network. The thermal conductivity of the hybrid composite (up to 44 W m−1 K−1) is thus enhanced by two orders of magnitude versus that of the pristine salt (0.64 W m−1 K−1).

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Section: Hybrid Gf Tt -Gnp Tt Compositesupporting

confidence: 88%

Section: Hybrid Gf Tt -Gnp Tt Compositesupporting

confidence: 84%

Thermally Conductive Molten Salt for Thermal Energy Storage: Synergistic Effect of a Hybrid Graphite‐Graphene Nanoplatelet Filler

Lavi,

Ohayon‐Lavi,

Leibovitch

et al. 2023

Global Challenges

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“…Investigations on synthesis of graphene layers in hydrocarbon flame at low pressure have shown that the formation of graphene layers is occurred in sooting zone as well as at atmospheric pressure, as was shown in [22][23][24]. Figure 3 shows the Raman spectra (a) that characterizing the carbon structures are formed on nickel plate in areas 0, 1, 2, 3 (b).…”

Section: Formation Of a Layered Graphene Films In Flamesmentioning

confidence: 87%

“…The Raman-spectra of carbon structures in accordance with (a) zones; and photo of nickel substrate (b) with an indication of formed carbon structure zones (P = 90 Torr, C/O = 0.8, T = 900 °C, t = 30 sec)[23].…”

mentioning

confidence: 95%

Complete Scheme for Fullerene, Graphene, and Soot Formation in Flame

Mansurov¹

2018

Eurasian Chem. Tech. J.

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Soot formation processes have been studied for more than 100 years, they include empirical and phenomenological description of conversion of various fuels to soot particles. This article provides an overview of current state of soot formation foundations, including the chemistry of soot nucleation, nucleation, mass growth as well as size of soot particles. Consideration of this issue shows that a great progress has been made, but there is still a lot of ambiguity in many areas of our knowledge. This concerns the role of aromatic molecules and radicals in nucleation and subsequent growth mass in laminar pre-mixed flames. Along with environmental problems, in recent time there are considered soot particles as an environment for nanomaterial synthesis, such as fullerenes, carbon nanotubes and graphenes. In this regard, a complete scheme of nanomaterials formation in mode of soot formation has been developed.

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“…The studies confirm that the process of achieving a flame graphene cannot compete with other existing methods. The process of formation of graphene in a flame is continuous, rapid, and cheap technique [6] . Flame synthesis is a high-temperature synthesis technique, which includes only a single-step process, resulting in a large-scale approach for fabricating diverse materials involving low-dimension carbon structures such as CNTs, fullerenes, and amorphous carbon thin films [7] .…”

Section: Introductionmentioning

confidence: 99%

Structural Properties of Multi-layer Graphene (MLG) Films Prepared by Flame Technique in Open Environment

Ali¹,

Hussein²,

Mohammed³

2016

ETJ

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Two multi-layer graphene (MLG) films were prepared on copper foils by flame synthesis technique with propane gas as carbon source at different temperatures ( 600 0 C and 700 0 C). The structural, morphological and chemical properties, of the synthesized MLG were studied. X-ray diffraction shows that the structure of MLG films is polycrystalline with preferential orientation in the [101] direction. Morphological properties were observed by AFM images, the grain size and average surface roughness of the obtained MLG films are found to increasing with temperature increases and decreasing with the distance. The Fourier transform infrared spectroscopy (FTIR) spectrum showed the stretching vibration of C=C aromatic ring and the stretching vibration from C-C bond. Also the oxygen-containing functional groups have been appeared like C=O, C-O and C-OH.

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The Effect of Pressure on the Synthesis of Graphene Layers in the Flame

Cited by 5 publications

References 5 publications

Thermally Conductive Molten Salt for Thermal Energy Storage: Synergistic Effect of a Hybrid Graphite‐Graphene Nanoplatelet Filler

Thermally Conductive Molten Salt for Thermal Energy Storage: Synergistic Effect of a Hybrid Graphite‐Graphene Nanoplatelet Filler

Complete Scheme for Fullerene, Graphene, and Soot Formation in Flame

Structural Properties of Multi-layer Graphene (MLG) Films Prepared by Flame Technique in Open Environment

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