The importance of standard isotherms in the analysis of adsorption isotherms for determining the porous texture of solids

Lecloux, A. J.; Pirard, Jean‐Paul

doi:10.1016/0021-9797(79)90031-6

Cited by 370 publications

(140 citation statements)

References 11 publications

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“…In each case an upper deviation from the straight line is observed, which confirms that the structure is mainly mesoporous. [21] However, deviation is more important for sludge A, which indicates that mesoporosity is higher in this sludge than in sludge B.…”

Section: Nitrogen Adsorption-desorptionmentioning

confidence: 92%

Multiscale Texture Characterization of Wastewater Sludges Dried in a Convective Rig

et al. 2003

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Secondary sludges from two different wastewater treatment plants are conditioned and dewatered in the same way before drying in a lab-scale convective rig at the same operating conditions. Several techniques are used to characterize the texture of the dried materials over a wide range of scales from nm up to mm. Texture and porosity of the dried products are studied by SEM imaging, nitrogen absorption isotherms (0.5 < d p < 50nm), mercury porosimetry (7.5nm< d p < 150µm) and X-ray microtomography (spatial resolution = 41 µm). The image analysis of cross-sections reconstructed by microtomography also allows following shrinkage and textural evolution during drying.

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Section: Nitrogen Adsorption-desorptionmentioning

confidence: 92%

Multiscale Texture Characterization of Wastewater Sludges Dried in a Convective Rig

et al. 2003

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“…The microporosity of the samples was analyzed using the t-method of Lippens and De Boer (1965). The curve proposed by Lecloux and Pirard (1979) for values of CBET between 100 and 300 was chosen as the standard.…”

Section: Methodsmentioning

confidence: 99%

Mechanism of Acid Activation of Magnesic Palygorskite

González

Pesquera

Benito

et al. 1989

Clays and clay miner.

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Abstract--This paper compares the texture of palygorskite after acid leaching with that of the product after extraction silica is removed. These effects were evaluated on the basis of nitrogen adsorptiondesorption and mercury penetration porosimetry. Acid leaching at reflux temperature with 2 N HC1 resulted in an increase in surface area from 138 to 399 mVg, due to a partial (~ 50%) dissolution of the octahedral sheet and the creation of microporosity. This microporosity disappeared if the silica generated by the leaching was removed. The surface area also decreased from 399 to 214 mVg, and the pore volume decreased from 0.538 to 0.507 cm3/g. The microporosity must therefore have been due to texture development in the generated silica.

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“…5c and d, the adsorbed volume on both samples at a given pressure is plotted as a function of the statistical thickness t of the N 2 layer adsorbed at the same pressure on a reference non porous material. According to a procedure developed by Lecloux and Pirard [7], this reference is chosen on the basis of the interaction between the vapor and the solid, as assessed by the value of the C BET constant of the BET model. The t-plots corresponding to both samples exhibit a first linear trend whose slope S t is related to the samples specific surface area, followed by an upward deviation from linearity, which is much more visible for sample S2 than for S1, at a pressure corresponding to the hump in the isotherm of sample S2.…”

Section: N 2 Adsorptionmentioning

confidence: 99%

Comparison of different methods for characterizing multi-walled carbon nanotubes

Gommes

Blacher

Dupont-Pavlovsky³

et al. 2004

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Four complementary and independent methods are used to characterize nanotube samples: (i) TEM observation coupled with image analysis, (ii) nitrogen and krypton adsorption isotherm analysis, (iii) thermogravimetry and (iv) wide angle X-ray scattering. The methodology is discussed on the basis of two multi-walled carbon nanotube samples produced by the CCVD technique with very different reaction rates. It is shown that the total amount of deposited carbon is larger for the sample produced at the higher rate, that the fraction of nanotubes in the deposited carbon does not seem to be significantly different, but that the crystallinity of the nanotubes wall is larger for the sample produced at the lowest reaction rate.

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The importance of standard isotherms in the analysis of adsorption isotherms for determining the porous texture of solids

Cited by 370 publications

References 11 publications

Multiscale Texture Characterization of Wastewater Sludges Dried in a Convective Rig

Multiscale Texture Characterization of Wastewater Sludges Dried in a Convective Rig

Mechanism of Acid Activation of Magnesic Palygorskite

Comparison of different methods for characterizing multi-walled carbon nanotubes

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