Dispersive Transport | ScienceGate

Relatively immobile chemicals have been observed moving significantly faster than anticipated from hydrophobic theory. A theory is developed considering transport in three mobile fluid phases which can be used to describe this facilitated transport. The convective dispersive transport equation is solved utilizing a transformation of variables which permits utilizing existing solutions covering a wide variety of boundary conditions. The impact of the facilitated transport is demonstrated for one case where the soils organic carbon is 10%. If 2% of the fluid phase is an organic fraction, the theory developed projects that hydrophobic theory may underestimate mobility by more than 100 times. At concentrations of dissolved organic carbon normally observed in nature (5 - 10 mg/l), a measurable increased mobility is anticipated for the very immobile compounds like dioxins.

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Dispersive Transport of Hydrogen in MOS Structures after Exposure to Ionizing Radiation

Semiconductors ◽

10.1134/s1063782620100036 ◽

2020 ◽

Vol 54 (10) ◽

pp. 1215-1219

Author(s):

O. V. Aleksandrov

Keyword(s):

Ionizing Radiation ◽

Dispersive Transport ◽

Mos Structures

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Comment on “Dispersive Transport Dynamics in a Strongly Coupled Groundwater-Brine Flow System” by Curtis M. Oldenburg and Karsten Pruess

Water Resources Research ◽

10.1029/96wr02495 ◽

1996 ◽

Vol 32 (11) ◽

pp. 3405-3410 ◽

Cited By ~ 10

Author(s):

Russell T. Johns ◽

Alfonso Rivera

Keyword(s):

Flow System ◽

Dispersive Transport ◽

Strongly Coupled ◽

Transport Dynamics

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Influence of the Distribution of Tail States in a-Si:H on the Field Dependence of Carrier Drift Mobilities

MRS Proceedings ◽

10.1557/proc-808-a5.6 ◽

2004 ◽

Vol 808 ◽

Cited By ~ 1

Author(s):

Monica Brinza ◽

Evguenia V. Emelianova ◽

André Stesmans ◽

Guy J. Adriaenssens

Keyword(s):

Field Dependence ◽

Carrier Mobility ◽

Transport Model ◽

Chemical Vapor ◽

Gaussian Component ◽

Dispersive Transport ◽

Exponential Distributions ◽

Band Tail ◽

Multiple Trapping ◽

Gaussian Density

ABSTRACTExponential distributions of tail states have been able, within the framework of a multiple-trapping transport model, to account rather well for the time-of-flight photoconductivity transients that are measured with ‘standard’ a-Si:H, i.e. material prepared by plasma-enhanced chemical vapor deposition at ∼250°C. A field-dependent carrier mobility in the dispersive transport regime is part of the observations. However, samples prepared in an expanding thermal plasma, although still exhibiting the dispersive transients, fail to show this field dependence. The presence of a Gaussian component in the density of valence-band tail states can account for such behavior for the hole transients. Nanoscale ordered inclusions in the amorphous matrix are thought to be responsible for the Gaussian density of states contribution.

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