Determination of lateral diffusion coefficients in air-water monolayers by fluorescence quenching measurements

A method of the determining of the mutual diffusion coefficients in ternary intermediate phases is suggested. Methodology for determination of the interdiffusion coefficients of phases formed in a ternary diffusion couple in T-sample configuration is presented. The method requires only one annealing of the T-sample and makes it possible to calculate the matrix of the diffusion coefficients in the (CuNi)6Sn5 and Cu3Sn ternary intermediate phases under low temperature. The concentration profiles and electron micrograph of the diffusion zone was obtained in the ternary Cu-Ni-Sn system annealed for 64 hours under 200°C. Phase competition in this ternary system with special configuration of T-sample leads to lateral diffusion of Cu, to formation (CuNi)6Sn5 compound between Ni-Sn side and to suppression of other NixSny intermediate phases.

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Measurement of the lateral diffusion coefficients of ubiquinones in lipid vesicles by fluorescence quenching of 12-(9-anthroyl)stearate

FEBS Letters ◽

10.1016/0014-5793(85)80526-3 ◽

1985 ◽

Vol 179 (2) ◽

pp. 238-242 ◽

Cited By ~ 35

Author(s):

Romana Fato ◽

Maurizio Battino ◽

Giovanna Parenti Castelli ◽

Giorgio Lenaz

Keyword(s):

Fluorescence Quenching ◽

Diffusion Coefficients ◽

Lateral Diffusion ◽

Lipid Vesicles

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The Calculation of Turbulent Diffusion Coefficients in Aquatic Ecosystems

Revista de Chimie ◽

10.37358/rc.19.11.7669 ◽

2019 ◽

Vol 70 (11) ◽

pp. 3903-3907

Author(s):

Galina Marusic ◽

Valeriu Panaitescu

Keyword(s):

Transport Equation ◽

Turbulent Diffusion ◽

Diffusion Coefficients ◽

Aquatic Ecosystems ◽

Specific Area ◽

Left Bank ◽

The Right ◽

Prut River

The paper deals with the issues related to the pollution of aquatic ecosystems. The influence of turbulence on the transport and dispersion of pollutants in the mentioned systems, as well as the calculation of the turbulent diffusion coefficients are studied. A case study on the determination of turbulent diffusion coefficients for some sectors of the Prut River is presented. A new method is proposed for the determination of the turbulent diffusion coefficients in the pollutant transport equation for specific sectors of a river, according to the associated number of P�clet, calculated for each specific area: the left bank, the right bank and the middle of the river.

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Comments on determination of diffusion coefficients by chronoamperometry with unshielded planar stationary electrodes

Analytical Chemistry ◽

10.1021/ac00253a048 ◽

1983 ◽

Vol 55 (2) ◽

pp. 382-383 ◽

Cited By ~ 2

Author(s):

Duane E. Weisshaar ◽

Dennis E. Tallman

Keyword(s):

Diffusion Coefficients

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Migration of mineral oil in elastomers

Journal of Rubber Research ◽

10.1007/s42464-021-00087-7 ◽

2021 ◽

Author(s):

Tobias Förster ◽

Artur Blivernitz

Keyword(s):

Diffusion Coefficients ◽

Mineral Oil ◽

Activation Energies ◽

Concentration Profiles ◽

Small Reservoir ◽

Experimental Procedure ◽

Mineral Oils ◽

The Absolute ◽

Suitable Measure

AbstractThis work describes a newly introduced experimental procedure to quantify the diffusion progress of mineral oils locally resolved in NBR. Diffusion of reference oils IRM 901, IRM 902 and IRM 903 in NBR with various acrylonitrile contents was investigated. Classical sorption experiments were performed as a basic characterization and compared to the newly introduced method. Here, elastomer specimens are only being dipped with the bottom in a relatively small reservoir of mineral oil. This provides a determination of locally resolved concentration profiles of mineral oils, and the calculation of diffusion coefficients. These diffusion coefficients follow the same trends like those determined via sorption experiments. Despite differences in the absolute numbers, activation energies of diffusion can be applied as a suitable measure for the compatibility of elastomers and fluids.

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