Adsorbate cross-sectional area as a function of the BET C constant

Lowell, S.; Shields, Joan E.; Charalambous, George; Manzione, J

doi:10.1016/0021-9797(82)90056-x

Cited by 18 publications

(18 citation statements)

References 5 publications

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“…In this study, the c values obtained from BET analysis for MSN AP and MSN UN were 82.99 and 60.48, respectively, which categorized as relatively high values. The low c values represent weak gas adsorption due to low surface area of the solids [17,19,20].…”

Section: Characteristics Of the Adsorbent Materialsmentioning

confidence: 99%

Amino modified mesostructured silica nanoparticles for efficient adsorption of methylene blue

Karim

Jalil

Triwahyono

et al. 2012

Journal of Colloid and Interface Science

141

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Section: Characteristics Of the Adsorbent Materialsmentioning

confidence: 99%

Amino modified mesostructured silica nanoparticles for efficient adsorption of methylene blue

Karim

Jalil

Triwahyono

et al. 2012

Journal of Colloid and Interface Science

141

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“…For adsorption, the gas density at p = 50 bar is high enough that the number of molecules striking the surface in one second, p/(2πmkT ) 1/2 × × m s × (1 s), is approximately 10 11 times larger than the number of molecules forming a monolayer on the surface, × m s /α(T ). This gives t ads ∼ 10 −11 s. For desorption from a mobile monolayer at ambient temperature, equation (18), the desorption time equals the period of oscillation of a molecule normal to the surface, divided by the probability that the molecule has energy E B to leave the potential well, exp(−E B / (N A kT )). This gives (14) and (15)).…”

Section: %mentioning

confidence: 99%

Hydrogen storage in engineered carbon nanospaces

Burress¹,

Kraus²,

Beckner³

et al. 2009

Nanotechnology

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It is shown how appropriately engineered nanoporous carbons provide materials for reversible hydrogen storage, based on physisorption, with exceptional storage capacities (∼80 g H 2 /kg carbon, ∼50 g H 2 /liter carbon, at 50 bar and 77 K). Nanopores generate high storage capacities (a) by having high surface area to volume ratios, and (b) by hosting deep potential wells through overlapping substrate potentials from opposite pore walls, giving rise to a binding energy nearly twice the binding energy in wide pores. Experimental case studies are presented with surface areas as high as 3100 m 2 g −1 , in which 40% of all surface sites reside in pores of width ∼0.7 nm and binding energy ∼9 kJ mol −1 , and 60% of sites in pores of width >1.0 nm and binding energy ∼5 kJ mol −1 . The findings, including the prevalence of just two distinct binding energies, are in excellent agreement with results from molecular dynamics simulations. It is also shown, from statistical mechanical models, that one can experimentally distinguish between the situation in which molecules do (mobile adsorption) and do not (localized adsorption) move parallel to the surface, how such lateral dynamics affects the hydrogen storage capacity, and how the two situations are controlled by the vibrational frequencies of adsorbed hydrogen molecules parallel and perpendicular to the surface: in the samples presented, adsorption is mobile at 293 K, and localized at 77 K. These findings make a strong case for it being possible to significantly increase hydrogen storage capacities in nanoporous carbons by suitable engineering of the nanopore space.

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“…When a cube, real or imaginary, of one meter edge length is subdivided into smaller cubes each one micrometer (10-6 meter) in length there will be formed 10 18 particles, each exposing an area of 6 x 10-12 square meters (m 2 ). Thus, the total area of all the particles is 6 x 10 6 m 2 .…”

Section: Factors Affecting Surface Areamentioning

confidence: 99%