Characterization and functionalization by sol–gel route of SiC foams

Mollicone, Jessica; Ansart, Florence; Lenormand, Pascal; Duployer, Benjamin; Tenailleau, Christophe; Vicente, Jérôme

doi:10.1016/j.jeurceramsoc.2014.05.030

Cited by 21 publications

(5 citation statements)

References 17 publications

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“…The spectra showed crystalline materials with 2θ peaks lying at 24,42 ∘ (012), 33,54 ∘ (104), 36,54 ∘ (110), 41,46 ∘ (113), 50,12 ∘ (024), 54,86 ∘ (116), 63,62 ∘ (214), 65,20 ∘ (300). All peaks are identical to those corresponding to the Cr 2 O 3 phase indexed in the rhombohedral structure with an R-3c space group, as described in the 072-3533 JCPDS card [31,32]. The strong intensity of the peaks representing the preferential orientation in the (104), (110) and (116) planes indicates that thin films exhibit good crystallinity [33].…”

Section: Results and Discussion A) Structural Characterizationmentioning

confidence: 56%

Synthesis and characterization of Cu doped chromium oxide (Cr₂O₃) thin films

Zekaik

Benhebal

Benrabah

2019

High Temperature Materials and Processes

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Cu-doped Cr2O3 thin films were deposited onto glass substrate by the sol–gel dip-coating (SGDC) process using dopant values of 0, 3, 6, 9 and 12%. The Chromium (III) Nitrate Nonahydrate [Cr(NO3)3·9H2O] was used as a Cr source, whilst for the dopant, the corresponding nitrate (Cu(NO3)2) was used. The crystal structure, as well as the optical and electrical properties were examined. XRD data showed that the films with a high degree of crystallinity were rhombohedral Cr2O3 phase. The crystallite size reduces with increase in Cu doping proportion. The AFM results indicate a decrease in the surface roughness of the doped Cr2O3: Cu thin films. The UV-Vis spectra of the Cu doped-Cr2O3 films showed high transparency in the visible region. The optical band gap of Cr2O3 thin films decreases with increasing in Cu doping rate. The Nyquist plot shows that the equivalent circuit of Cu doped-Cr2O3 films is a parallel circuit RpCp. As the concentration of Cu increases, Resistance RP regresses while capacitance Cp increases.

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Section: Results and Discussion A) Structural Characterizationmentioning

confidence: 56%

Synthesis and characterization of Cu doped chromium oxide (Cr₂O₃) thin films

Zekaik

Benhebal

Benrabah

2019

High Temperature Materials and Processes

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“…The extraction of geometrical and morphological information from different kinds of cellular materials using iMorph can be consulted in the previous studies. [14,20,22,40,51] The modeling approach presented in this article has led to an additional implementation in the software iMorph for the construction of the solid and fluid phase coupling graph and the extraction of specific geometrical measurements. The construction of the graph based on Plateau's laws is discussed here.…”

Section: Graph Construction Using X-ray Ct and Imorphmentioning

confidence: 99%

Network‐Based Modeling of Transport Phenomena in Solid and Fluid Phases of Open‐Cell Foams: Construction of Graphs

et al. 2020

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From 3D X‐ray computed images and using iMorph software, two graphs are derived from the solid and fluid networks of open‐cell foams. The graphs are constructed based on the foam structure, which satisfies Plateau's laws. We have defined two types of graphs: 1) the representative graphs of solid and fluid phase networks: The graph of the solid phase is, intuitively, constructed by associating vertices to nodes and edges to struts. For the graph of the fluid phase, vertices are associated with porous cells and edges to throats at the interface of two cells. 2) the coupling graph is related to transfer phenomena between the fluid and solid phases: It is constructed by associating effective edges, which connect a vertex of the solid graph with an adjacent vertex of the fluid graph. The graphs lead to discrete element representation (topology preserving) with geometrical information of the foam structure. Physical variables can be attributed to the discrete objects called cell complex: internal energy to finite volume, heat flux to surface/interface, driving force to edge, and temperature to node. This alternative modeling approach based on graphs is promising for heterogeneous systems with large sizes as it reduces the computational complexity of conventional finite element meshing.

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“…A plasticizer is added in the sol (polyethyleneglycol PEG 35000, Aldrich, 60 g/L) according to optimized previous works [23]. This plasticizer allows the pre-coat to accommodate the constraints due to the surface roughness.…”

Section: Spectral Selectivity In the Ir-visible Rangementioning

confidence: 99%

Functionalization of SiC-based materials by a selective YBa2Cu3O7-δ coating via sol–gel route in order to optimize their optical properties

2015

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SiC-based materials are good candidates for the application as solar receivers except concerning their optical properties. Indeed, considering the use at high temperature, materials used as solar receivers have to efficiently absorb the visible-near infrared waves (corresponding to solar spectral range) and simultaneously reflect the mid and far-infrared rays but SiC is absorbent in all the whole visible-infrared spectral domain. In this challenging work, a suitable YBa 2 Cu 3 O 7-δ oxide which can present appropriate optical properties is studied. It was synthesized following a sol-gel route and it was obtained with a high level of purity. YBa 2 Cu 3 O 7-δ pellets were realized and heat treated at different temperatures revealing that the higher the heat treatment is, the better the oxygen stoichiometry (7-δ) is and the smoothest the surface is. This directly acts on the YBa 2 Cu 3 O 7-δ optical properties. Considering these results, an YBa 2 Cu 3 O 7-δ coating was realized on SiC pellets by dip-coating. A homogenous and covering layer of about 10 μm was obtained presenting very promising optical properties which were predominant in the FIR-MIR range whereas absorptance was increased in NIR-visible range.

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Characterization and functionalization by sol–gel route of SiC foams

Cited by 21 publications

References 17 publications

Synthesis and characterization of Cu doped chromium oxide (Cr₂O₃) thin films

Synthesis and characterization of Cu doped chromium oxide (Cr₂O₃) thin films

Network‐Based Modeling of Transport Phenomena in Solid and Fluid Phases of Open‐Cell Foams: Construction of Graphs

Functionalization of SiC-based materials by a selective YBa2Cu3O7-δ coating via sol–gel route in order to optimize their optical properties

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Characterization and functionalization by sol–gel route of SiC foams

Cited by 21 publications

References 17 publications

Synthesis and characterization of Cu doped chromium oxide (Cr2O3) thin films

Synthesis and characterization of Cu doped chromium oxide (Cr2O3) thin films

Network‐Based Modeling of Transport Phenomena in Solid and Fluid Phases of Open‐Cell Foams: Construction of Graphs

Functionalization of SiC-based materials by a selective YBa2Cu3O7-δ coating via sol–gel route in order to optimize their optical properties

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Synthesis and characterization of Cu doped chromium oxide (Cr₂O₃) thin films

Synthesis and characterization of Cu doped chromium oxide (Cr₂O₃) thin films