Measurement of Sorption Isotherms with Flow-Through Reactors

Grolimund, Daniel; Borkovec, Michal; Federer, Peter; Sticher, H.

doi:10.1021/es00009a025

Cited by 50 publications

(39 citation statements)

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“…In transient photoconductivity experiments, and the adsorption of ions in semiconductors, concentration distributions may have a long tail such that the standard deviation is diverging [11]. This longtail problem is common to various flows in non-uniform media, in many fields such as chemical engineering and environmental sciences [12].…”

Section: Collision Rates and Free Path Distributionsmentioning

confidence: 99%

Molecular free path distribution in rarefied gases

Dongari¹,

Zhang²,

Reese³

2011

J. Phys. D: Appl. Phys.

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Abstract. We present the results of investigations into the distribution of molecular free paths in rarefied gases using molecular dynamics simulations. Our tests on a range of different gas densities and confinements (unbounded, single bounding wall, and parallel bounding walls) indicate that the molecules perform Lévy-type flights, irrespective of the presence of a bounding wall. The free paths most closely follow a power-law distribution. Simulations of gases confined by planar surfaces indicate that the local molecular mean free path varies sharply close to a solid surface. These results may yield new insight into diffusive transport in rarefied gases, in particular, the constitutive behaviour of gas flows in micro and nanoscale devices.

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Section: Collision Rates and Free Path Distributionsmentioning

confidence: 99%

Molecular free path distribution in rarefied gases

Dongari¹,

Zhang²,

Reese³

2011

J. Phys. D: Appl. Phys.

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“…In transient photoconductivity experiments, concentration distributions may have a long tail such that the standard deviation is diverging. This long-tail problem is common to various flows in non-uniform media, in many fields such as chemical engineering and environmental sciences [19].…”

Section: A Model For Non-equilibrium Mean Free Pathmentioning

confidence: 99%

The Importance of Mean Free Path in Determining Gas Micro Flow Behaviour

Dongari

Zhang

Reese

2010

ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels: Parts a and B

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“…Synthesized goethite was aged at high Cp before being in a series of polypropylene centrifuge tubes with each tube used at lower Cp to eliminate the influences of solid aggrega-containing the same Cp of goethite. A specified Cp was tion (12)(13)(14)(15) and the preadsorbed substances (8). The in-prepared by pipetting an appropriate volume of stock goefluence of organic matter should also be reduced to the mini-thite suspension (22 g/l) into the reaction vessel and diluting mum in these controlled experiments.…”

Section: Adsorption and Desorption Isotherms (Series Imentioning

confidence: 99%

“…the correction is based, is a function of metal concentration. It is not convenient to measure many pH curves at various Grolimund et al proposed that the Cp effect is due to an artifact of preadsorbed substances on the soil (8). They metal concentrations covered in the experiments.…”

Section: Ph Conditions Of the Experimentsmentioning

confidence: 99%

“…

effect to a variety of experimental artifacts (3)(4)(5)(6)(7)(8). In the In a controlled simple aqueous system containing Zn-goethite, MEA theory (1, 2), we proposed that, although many artiwhere a clear particle concentration effect (Cp effect) is observed, facts may cause a pseudo Cp effect, there is a universal an increase in particle concentration (Cp) causes a simultaneous reason that can cause a real Cp effect.

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