Experimental Determination of Transmittance of Porous Cerium Dioxide Media in the Spectral Range of 300–1,100 nm

Liang, Zhangqian; Chueh, William C.; Ganesan, Krithiga; Haile, Sossina M.; Lipiński, Wojciech

doi:10.1080/08916152.2010.542876

Cited by 17 publications

(5 citation statements)

References 26 publications

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“…These values are comparable with those obtained using a correlation for reticulate porous ceramics (

β = \frac{4.4 (1 - ε)}{d}

) [33]. The calculated extinction coefficients show the same order of magnitude as those estimated by transmittance measurements of similar ceria foams (

ε = 0.72

, graphite and starch pore-formers) at low wavelengths where the opacity assumption of solid ceria holds [34]. The porous ceria foam behaves as a nearly opaque medium, as expected for small pore dimensions.…”

Section: Heat Transfer Characterizationsupporting

confidence: 84%

Effective Heat and Mass Transport Properties of Anisotropic Porous Ceria for Solar Thermochemical Fuel Generation

Haussener

Steinfeld

2012

Materials

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High-resolution X-ray computed tomography is employed to obtain the exact 3D geometrical configuration of porous anisotropic ceria applied in solar-driven thermochemical cycles for splitting H2O and CO2. The tomography data are, in turn, used in direct pore-level numerical simulations for determining the morphological and effective heat/mass transport properties of porous ceria, namely: porosity, specific surface area, pore size distribution, extinction coefficient, thermal conductivity, convective heat transfer coefficient, permeability, Dupuit-Forchheimer coefficient, and tortuosity and residence time distributions. Tailored foam designs for enhanced transport properties are examined by means of adjusting morphologies of artificial ceria samples composed of bimodal distributed overlapping transparent spheres in an opaque medium.

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“…These values are comparable with those obtained using a correlation for reticulate porous ceramics (

β = \frac{4.4 (1 - ε)}{d}

) [33]. The calculated extinction coefficients show the same order of magnitude as those estimated by transmittance measurements of similar ceria foams (

ε = 0.72

Section: Heat Transfer Characterizationsupporting

confidence: 84%

Effective Heat and Mass Transport Properties of Anisotropic Porous Ceria for Solar Thermochemical Fuel Generation

Haussener

Steinfeld

2012

Materials

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“…The overall transmittance of sintered ceria structures with average porosities of 0.08 and 0.72 was experimentally found for the spectral range of 0.3-1.7 μm [8,9]. Both samples were found to be highly opaque up to 0.4 μm, and the mean radiation penetration path was found to be shorter in higher porosity samples, suggesting higher scattering for wavelengths greater than 0.4 μm.…”

Section: Introductionmentioning

confidence: 87%

“…Previous pertinent studies of radiative characteristics of dense ceria media are reported in [7][8][9][10][11]. The overall transmittance of sintered ceria structures with average porosities of 0.08 and 0.72 was experimentally found for the spectral range of 0.3-1.7 μm [8,9].…”

Section: Introductionmentioning

confidence: 93%

Effect of pore-level geometry on far-field radiative properties of three-dimensionally ordered macroporous ceria particle

Randrianalisoa

Lipiński

2014

Appl. Opt.

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The effects of pore size on direction-averaged radiative properties of three-dimensionally ordered macroporous (3DOM) cerium dioxide (ceria) particles are investigated in the spectral range of 0.3-10 μm. The particles are of spherical shape and contain interconnected pores in a face-centered cubic lattice arrangement. The porous particle is modeled as a three-dimensional array of interacting dipoles using the discrete dipole approximation (DDA). The validity of the Lorenz-Mie theory to predict far-field radiative properties of a quasi-homogeneous particle with the effective optical properties obtained using the volume-averaging theory (VAT) is demonstrated. Direction-averaged extinction, scattering, and absorption efficiency factors as well as the scattering asymmetry factor are determined as a function of the pore size for a particle of 1 μm diameter and as a function of the particle size for pores of 400 nm diameter. The overlapping ordered pores in the 3DOM particles and the boundary effects in the presence of pores of size comparable to that of the particle are shown to affect the radiative properties in the ultraviolet to near-infrared spectral ranges. The effects of the 3DOM pore-level features on the far-field radiative properties are not captured by the Lorenz-Mie theory combined with VAT. Consequently, the use of advanced modeling tools such as DDA is necessary. In the mid- and far-infrared spectral ranges, the effects of 3DOM pore-level features on the far-field radiative properties diminish and the approach combining the Lorenz-Mie theory and VAT is shown to be accurate.

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“…Experimental studies (Liang et al , 2011; Ganesan and Lipiński, 2011) have shown that porous ceria ceramics is characterized by very week absorption in the wavelength range of 0.6 < λ < 20.6 μm. Accurate determination of absorption coefficient in this range is difficult because of intense scattering and, consequently, very low values of the sample transmittance.…”

Section: Introductionmentioning

confidence: 99%

Simple methods for identification of radiative properties of highly-porous ceria ceramics in the range of semi-transparency

Dombrovsky

Lipínski

2017

HFF

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Purpose The aim of this paper is to present advanced experimental–numerical methods for identification of spectral absorption and scattering properties of highly porous ceria ceramics in the range of semi-transparency at room and elevated temperatures. Design/methodology/approach At room temperature, a period of quasi-steady oscillations of the sample surface temperature generated in response to recurrent laser heating at fixed values of the maximum and minimum temperature of the irradiated surface is measured along with the normal-hemispherical reflectance. Radiative properties are then identified using a combined heat transfer model. At elevated temperatures, an analytical solution proposed in an earlier study for zirconia ceramics is used to retrieve spectral absorption coefficient of ceria ceramics from the measured normal emittance. Findings and Originality/value This method can be used to obtain small absorption coefficient of ceria ceramics at room temperature. The required measurements of both the normal-hemispherical reflectance and the period of quasi-steady oscillations of the irradiated surface temperature of the ceramics sample between fixed values of the maximum and minimum temperatures can be readily conducted using thermal laboratory equipment. Another method has been suggested for identification of the spectral absorption coefficient of ceria ceramics at elevated temperatures. This method is based on a relation between the measured normal emittance of an isothermal sample and the absorption coefficient.

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Experimental Determination of Transmittance of Porous Cerium Dioxide Media in the Spectral Range of 300–1,100 nm

Cited by 17 publications

References 26 publications

Effective Heat and Mass Transport Properties of Anisotropic Porous Ceria for Solar Thermochemical Fuel Generation

Effective Heat and Mass Transport Properties of Anisotropic Porous Ceria for Solar Thermochemical Fuel Generation

Effect of pore-level geometry on far-field radiative properties of three-dimensionally ordered macroporous ceria particle

Simple methods for identification of radiative properties of highly-porous ceria ceramics in the range of semi-transparency

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