Preparation and structural characterisation of model cellular vitreous carbon foams

Letellier, M.; Szczurek, Andrzej; Basso, María Cecilia; Pizzi, A.; Fierro, Vanessa; Ferry, Olivier; Celzard, Alain

doi:10.1016/j.carbon.2016.11.017

Cited by 34 publications

(24 citation statements)

References 35 publications

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“…The deduced oxygen content was then around 7 %. Those values are quite typical for a carbon material derived from phenolic resin and other oxygenated precursors such as those reported in the synthesis 34,35 . As a result, the carbon was expected to be highly disordered, hence the name "glassy" it was given, and this was proved by Raman spectra shown in Fig.3.…”

Section: (A)-(b) a Photo Of The Gcss Monolayer Formed "As Is" Is Presupporting

confidence: 53%

Fully carbon metasurface: Absorbing coating in microwaves

Bychanok

Gorokhov

et al. 2017

Journal of Applied Physics

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The microwave-absorbing properties of a heterostructure consisting of an ordered monolayer of porous glassy carbon spheres were experimentally and theoretically investigated in the Ka-band (26-37 GHz) frequency range. The electromagnetic response of such "moth-eye"-like all-carbon metasurface at a normal incidence angle was modelled on the basis of long-wave approximation. Modelling parameters in the Ka-band were used to estimate and predict the absorption properties of monolayers in free space in the range 1-40 GHz. Experimental and theoretical results demonstrate that a metasurface based on porous glassy carbon spheres is an inert, lightweight, compact and perfectly absorbing material for designing new effective microwave absorbers in various practically used frequency ranges.

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Section: (A)-(b) a Photo Of The Gcss Monolayer Formed "As Is" Is Presupporting

confidence: 53%

Fully carbon metasurface: Absorbing coating in microwaves

Bychanok

Gorokhov

et al. 2017

Journal of Applied Physics

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“…The most common laboratory-scale method of preparing AlF 3 involves the wet chemical treatment of Al or Al-based substances with hydrofluoric acid (HF) [22]. On the other hand, amorphous carbon foams with tuned porosity, specific areas, pore volumes and surface chemistries are frequently produced using a variety of procedures, such as physical or chemical blowing of carbon precursors, template carbonization, compression of exfoliated graphite, and assembly of graphene nanosheets [23][24][25][26]. Such porous carbonaceous structures act as effective matrices/substrates for the deposition of catalytically active nanoparticles, which are, in most cases, introduced onto the carbon surface in a subsequent stage (upon synthesis), combining wet chemical and thermal reduction processes [1].…”

Section: Introductionmentioning

confidence: 99%

Novel combustion synthesis of carbon foam‑aluminum fluoride nanocomposite materials

et al. 2018

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“…The study of RVC's volumetric surface area by µCT has not been reported, although the cell size of a tannin-based RVC specimen was recently measured by this technique [46]. (Studies of metal deposit distribution on RVC substrates using radiography [47] and low-resolution CT [48] are available.)…”

Section: Volumetric Surface Area Of Rvcmentioning

confidence: 99%

“…Still, a resolution of 1.3 µm per voxel has proved to possess the detail level required to resolve the features of the material for surface area measurements. Indeed, it has been pointed out that a resolution of 5.0 µm per voxel was adequate for the study of cell sizes in many types of carbon foams [46], but insufficient for resolving their cell walls.…”

Section: Volumetric Surface Area Of Rvcmentioning

confidence: 99%

“…In contrast, surface area measurements on SEM images, such as [1,22], are time consuming and tedious, although it is possible to obtain accurate I data at relatively low cost. The SEM method is faster and more convenient for the study of cell size distribution when compared to µCT [46]. Close estimations of I and tortuosity from pressure drop measurements via the Ergun equation (given e) benefit from simplicity and low cost, allowing to determine such characteristics for much larger specimens with the aid of a fluid [53,54].…”

Section: Volumetric Surface Area Of Rvcmentioning

confidence: 99%

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X-ray computed micro-tomography of reticulated vitreous carbon

Arenas

Boardman

León

et al. 2018

Carbon

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The 3D structure of various grades of reticulated vitreous carbon (RVC) is studied by X-ray computed micro-tomography (µCT). The settings required to estimate the bulk volumetric surface area accurately are investigated and the results are compared to those obtained from scanning electron microscopy and from pressure drop measurements via the Ergun equation. A resolution of 1.3 µm per voxel in µCT imaging is needed to determine the volumetric surface area, but its value is highly dependent on post-processing. A resolution of 9.6 µm per voxel underestimated the volumetric surface area, Ae, by a factor of up to 0.64 due to an incomplete resolution of the cell struts. This latter resolution is, however, sufficient to establish the volumetric porosity and the relative density. Theoretical estimations of electrical resistivity using these properties are consistent with those reported in the literature. Cell volume and cell surface area distributions are then obtained from computational analysis of the digitally rendered structure of 100 ppi RVC. Both cases can be approximated by a gamma function. Suitable instrumental µCT conditions for performing metrological studies on bare and modified RVC are proposed. Opportunities for the modelling of decorated and coated digitally rendered RVC are discussed.

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Preparation and structural characterisation of model cellular vitreous carbon foams

Cited by 34 publications

References 35 publications

Fully carbon metasurface: Absorbing coating in microwaves

Fully carbon metasurface: Absorbing coating in microwaves

Novel combustion synthesis of carbon foam‑aluminum fluoride nanocomposite materials

X-ray computed micro-tomography of reticulated vitreous carbon

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