Specific surface area
MODEL OF THE STRUCTURED CONTINUUM, AND THE RELATION BETWEEN SPECIFIC SURFACE AREA, POROSITY AND PERMEABILITY
... To begin predicting the stress and strain for real geological structures, we need to know the P and S velocities and the seis- mic boundary configuration, which is a separate classical seismic problem. In the present ...
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Sensitivity of snow density and specific surface area measured by microtomography to different image processing algorithms
... the specific sur- face area (SSA), from these data, the greyscale image first needs to be segmented into a binary image of ice and ...the surface area of the binary ...face area ...
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Influence of excess sodium ions on the specific surface area formation in a NiO-Al2O3 catalyst prepared by different methods
... the specific surface area of the rinsed catalyst samples prepared by co-precipitation treated at 400 o C has ...higher specific surface area than the samples treated at 700 o ...
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Bioactive ceramics with high specific surface area for osteoconduction
... To improve its biological binding properties and ultimately biofunctionalizing the ceramic based biomaterial producing a composition resembling the one of bone, collagen type I was incorporated at the pores ...
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DEPARTAMENTO DE GEOLOGIA PROGRAMA DE PÓS-GRADUAÇÃO EM EVOLUÇÃO CRUSTAL E RECURSOS NATURAIS
... In grinding operations the efficiency may be expressed by relationships involving the initial and final particle size distributions. It can also be related to the ore blend specific surface area ...
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J. Braz. Chem. Soc. vol.23 número6
... instruments. Specific surface area and mean pore diameter (dp) were calculated from adsorption isotherms of nitrogen at 77 K using the standard ...
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J. Braz. Chem. Soc. vol.17 número6
... mesopore distribution with maximum at around 1.8 nm. These mesoporous system might correspond to windows connecting the cavities generated by the dissolution of the silica nanospheres. The carbon matrix Mb prepared from ...
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Mat. Res. vol.16 número2
... The greatest particle size reduction was observed particularly for UF-II cement that has 100% of powder under 35 µm. This particle size diminution can be also observed in the SEM micrographs shown in Figure 3. UF-II ...
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Braz. J. Chem. Eng. vol.21 número1
... Figure 9 shows results equivalent to those in Figure 8, but for the structural parameters (porosity, tortuosity, specific surface area) based on the effective porosity of the foams. The results ...
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Fluid Flow through Woven Fabrics by the Lattice-Boltzmann Method
... paper surface layers were removed in the direction of the transverse axis, now the thicknesses of the final samples lie between 120 μm and 200 ...porosity, specific surface area, and ...
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Synthesis of Chelating Agent Free-Solid Phase Extractor (CAF-SPE) Based on New SiO2 Al2O3 SnO2 Ternary Oxide and Application for Online Preconcentration of Pb 2+ Coupled with FAAS
... The specific surface area was estimated from nitrogen adsorption isotherms according to the Brunauer-Emmett-Teller (BET) multipoint method and the average pore diameter as well the pore volume were ...
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Mat. Res. vol.11 número3
... The ever growing focus on environmental issues has raised concerns about scrap tires, whose major component – vulcanized rubber – does not degrade easily. When burned, tires release toxic gases containing substantial ...
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Mat. Res. vol.10 número2
... the specific surface area, internal structure and morphology of the microcrystals of the transition aluminas of the chi-alumina series formed from the gibbsite crystals by the new method after heated ...
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Activated carbon fibres prepared from kenaf: Influence of the experimental consditions on the morphology and textural properties
... markedly, due to the development of defects between the basal planes of the fibre. Moreover, long treatment times exert a negative effect on the porous development of the samples in terms of micropore volume and fractal ...
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IRON OXIDES IN SOILS
... (gibbsite) mainly. On the other hand, the oxides hematite, goethite, maghemite and magnetite prevail in tropical and subtropical Oxisols (Alleoni; Camargo, 1995). Ferrihydrite and lepidocrocite are found in poorly ...
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Mat. Res. vol.5 número4
... high specific surface area of pores for gel obtained via conventional heating when com- pared with the specific surface area of pores for gel ob- tained via microwave ...
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Evaluation and Treatment of Coal Fly Ash for Adsorption Application
... Many researchers had investigated fly ash as an adsorbent for the uptake of organic compounds from petrochemical waste effluents. The availability, inexpensive and its adsorption characteristic had made it an alternative ...
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J. Braz. Chem. Soc. vol.25 número4
... specific surface area values, determined by the BET method, showed tendency to increase with increasing of the temperature, as well as the total pore volume values obtained by BJH ...
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Effect of polymorphism of Al2O3 on sintering and grain growth of magnesia aluminate spinel
... small, specific surface area was large, and the crystal lattice had many deficiencies [15], causing the grain size of MA to rapidly increase with increasing soaking time for the first ...the ...
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X ray diffraction (XRD)
... Solid phase transformation is a very common process among iron oxides and it is influenced by environmental conditions such as temperature, pH, and the existence of other solid phases, such as clay minerals and Fe 3+ ...
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