Recommendations for the characterization of porous solids (Technical Report)

Rouquérol, J.; Avnir, David; Fairbridge, Craig; Everett, D. H.; Haynes, J. M.; Pernicone, N.; Ramsay, J.D.F.; Sing, K. S. W.; Unger, Klaus K.

doi:10.1351/pac199466081739

Cited by 3,384 publications

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“…Additionally, N 2 sorption data give clear evidence of the mesoporosity of the meso-HSiO 1.5 ( Figure 2D). The adsorptionÀdesorption branches display type IV isotherms, typical for mesoporous materials, 26 with a BET surface area of 434 m 2 /g and a narrow pore size distribution centered at 10.5 nm Journal of the American Chemical Society ARTICLE ( Figure 2D, inset). The observed hysteresis occurs as a result of capillary condensation in mesopores with diameters larger than ca.…”

Section: ' Results and Discussionmentioning

confidence: 99%

Periodic Mesoporous Hydridosilica − Synthesis of an “Impossible” Material and Its Thermal Transformation into Brightly Photoluminescent Periodic Mesoporous Nanocrystal Silicon-Silica Composite

et al. 2011

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There has always been a fascination with “impossible” compounds, ones that do not break any rules of chemical bonding or valence but whose structures are unstable and do not exist. This instability can usually be rationalized in terms of chemical or physical restrictions associated with valence electron shells, multiple bonding, oxidation states, catenation, and the inert pair effect. In the pursuit of these “impossible” materials, appropriate conditions have sometimes been found to overcome these instabilities and synthesize missing compounds, yet for others these tricks have yet to be uncovered and the materials remain elusive. In the scientifically and technologically important field of periodic mesoporous silicas (PMS), one such “impossible” material is periodic mesoporous hydridosilica (meso-HSiO1.5). It is the archetype of a completely interrupted silica open framework material: its pore walls are comprised of a three-connected three-dimensional network that should be so thermodynamically unstable that any mesopores present would immediately collapse upon removal of the mesopore template. In this study we show that meso-HSiO1.5 can be synthesized by template-directed self-assembly of HSi(OEt)3 under aqueous acid-catalyzed conditions and after template extraction remains stable to 300 °C. Above this temperature, bond redistribution reactions initiate a metamorphic transformation which eventually yields periodic mesoporous nanocrystalline silicon-silica, meso-ncSi/SiO2, a nanocomposite material in which brightly photoluminescent silicon nanocrystallites are embedded within a silica matrix throughout the mesostructure. The integration of the properties of silicon nanocrystallinity with silica mesoporosity provides a wealth of new opportunities for emerging nanotechnologies.

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Section: ' Results and Discussionmentioning

confidence: 99%

Periodic Mesoporous Hydridosilica − Synthesis of an “Impossible” Material and Its Thermal Transformation into Brightly Photoluminescent Periodic Mesoporous Nanocrystal Silicon-Silica Composite

et al. 2011

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“…Zeolite and ceramic showed porous morphology, indicating that the zeolite and ceramic had bigger specific surface areas than the oyster shell and medical stone. In addition, the zeolite displayed micropore structure, while the ceramic showed macropore structure according to IUPAC classification for mineral pores with b 2 nm as micropores, 2-50 nm as mesopores and N50 nm as macropores (Rouquerol et al, 1994).…”

Section: Characteristics Of Wetland Substratesmentioning

confidence: 99%

Removal of antibiotics and antibiotic resistance genes from domestic sewage by constructed wetlands: Optimization of wetland substrates and hydraulic loading

Chen

Wei

Liu

et al. 2016

Science of The Total Environment

234

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“…However, determining the internal geometrical features, such as porosity and pore sizes, remains nontrivial. One of the standard methods to assess the porosity and the pore-size distribution is mercury intrusion porosimetry [7]. The method presupposes a structure of perfect cylindrical pores that are filled with mercury under pressure and has been proven to provide incorrect results for certain porous materials [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…The method presupposes a structure of perfect cylindrical pores that are filled with mercury under pressure and has been proven to provide incorrect results for certain porous materials [8,9]. Other methods used to assess the fine geometrical features of nanoporous materials include scanning electron microscopy (SEM) [9], x-ray computed tomography [10], radiation scattering [7], and gas adsorption techniques [7]. However, these methods are of high complexity, require long data collection times, and can be destructive or hazardous.…”

Section: Introductionmentioning

confidence: 99%