Introduction

Rouquérol, F.; Rouquérol, J.; Sing, K. S. W.; Maurin, Guillaume; Llewellyn, Philip

doi:10.1016/b978-0-08-097035-6.00001-2

Cited by 308 publications

(450 citation statements)

References 48 publications

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“…The evaluation of mesoporosity relies on the analysis of the isotherm in the regions of capillary condensation and evaporation and is associated to hysteresis phenomena and the existence of metastable states. The origin and interpretation of hysteresis in adsorption is a long standing and widely discussed issue, and yet discrepancies remain [3,[6][7][8][9]. A general consensus in this discussion is that the shape of the loop provides useful qualitative information about the mesoporous structure of the materials, as adsorption hysteresis depends on the size and shape of the pores and the connectivity of the pore system, among other factors.…”

Section: Introductionmentioning

confidence: 99%

“…Within this context, the characterization of the porous structure of materials has become a valuable tool and it is commonly obtained from the analysis of experimental adsorption isotherms of different gases (N 2 , CO 2 , Ar, H 2 ) at various temperatures [3]. Both classical (Dubinin-Radushkevich, BJH or t-plot) and molecular simulation methods have been extensively used for this purpose, allowing the determination of the apparent surface areas, pore volumes and pore size distributions (PSD).…”

Section: Introductionmentioning

confidence: 99%

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Effects of CO2 activation of carbon aerogels leading to ultrahigh micro-meso porosity

Rasines¹,

Macías²,

Haro

et al. 2015

Microporous and Mesoporous Materials

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We have analyzed the effects of CO 2 activation on the porosity of ultrahigh pore volume carbon aerogels. Data obtained from the new 2D-NLDFT-HS model for carbons has been compared to the results of conventional methods (BJH, t-plot, DR); all the models were applied to the desorption branch of the isotherms. Physical activation of the carbon aerogel at different burn-off degrees resulted in materials showing increasing volume of micropores and alteration of mesopore structure. The later effect manifested itself by a characteristic inflection in the desorption branch of the nitrogen isotherm at high relative pressures. Such curvatures are attributed to a non uniform activation of the carbon matrix with CO 2 that in some parts carves the surface of the precursor deeper than in others, creating bimodal/multimodal pore size distributions. The different methods applied for the assessment of the textural properties of the aerogels with ultrahigh micro-/mesoporosity showed excellent agreement in terms of pore volumes, surface areas and average pore size.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of CO2 activation of carbon aerogels leading to ultrahigh micro-meso porosity

Rasines¹,

Macías²,

Haro

et al. 2015

Microporous and Mesoporous Materials

View full text Add to dashboard Cite

show abstract

“…According to the literature, type IIb isotherms are typical of adsorbents having mesopores and macropores [20]. The amount of N 2 adsorbed at maximum pressure was higher in the samples prepared with higher L/P ratio, while the use of a coarse initial particle size led to larger hysteresis loops, irrespective of the L/P used.…”

Section: Nitrogen Sorptionmentioning

confidence: 99%

“…Different models can be applied to convert the data in pore size distribution, one of the most common being the BarrettJoyner-Halenda (BJH) method [16], which makes use of the combined effect of capillary condensation in the inner pore volume, and physical adsorption on the pore ¨ w alls, and assumes that pores are cylindrical. It provides the pore size distribution at the nanometer range [20].…”

Section: Nitrogen Sorptionmentioning

confidence: 99%

“…However, not only the ranges of pore sizes are different, also the specific structural features measured vary between techniques. Thus, MIP evaluates the pore entrance size [12], whereas the gas adsorption technique allows measuring both pore size and pore entrance size, using the adsorption and desorption curves respectively [20,27]. TPM allows the determination of the size of the cavity of the pore during the melting cycle and the pore entrance size during the freezing cycle [21,27].…”

Section: Introductionmentioning

confidence: 99%

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Multiple characterization study on porosity and pore structure of calcium phosphate cements

2015

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Being able to thoroughly characterize the intricate pore structure of calcium phosphate cements is a key step to successfully link the structural properties of these synthetic bone grafts with their most relevant properties, such as in vitro or in vivo behaviour, drug loading and release properties or degradation over time. This is a challenging task, due to the wide range of pore sizes compared to most other ceramic biomaterials. This work provides a critical assessment of three different techniques based on different physical phenomena, namely Mercury Intrusion Porosimetry (MIP), Nitrogen sorption and Thermoporometry (TPM) for the detailed characterization of four calcium phosphate cements with different textural properties, in terms of total porosity, Pore Size Distribution (PSD) and Pore Entrance Size Distribution (PESD). MIP had the advantage of covering a much wider size range than TPM and Nitrogen sorption, offering a more comprehensive information at the micrometric level. TPM, and specially Nitrogen sorption, besides being non-destructive techniques, and although covering a limited size range, provided complementary information regarding pore structure associated to crystal shape at the nanoscale, recording both PSD and PESD in a single experiment. MIP tended to register smaller sizes, especially at low L/P ratios, due to the network effect, that has a strong influence on the outcome of this technique.¡

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Dyeing Theory

Burkinshaw

2015

Physico‐chemical Aspects of Textile Coloration

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Introduction

Cited by 308 publications

References 48 publications

Effects of CO2 activation of carbon aerogels leading to ultrahigh micro-meso porosity

Effects of CO2 activation of carbon aerogels leading to ultrahigh micro-meso porosity

Multiple characterization study on porosity and pore structure of calcium phosphate cements

Dyeing Theory

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