1992
DOI: 10.1007/bf00647857
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Binary mutual diffusion coefficients of aqueous ammonium and potassium sulfates at 25°C

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Cited by 22 publications
(16 citation statements)
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“…With this restriction, there was no way to yield even qualitative agreement with all of the measured values of s. D 13 : binary diffusion coefficient measurements for aqueous ammonium sulfate show a fairly weak dependence on water activity when available data is extrapolated to low water activities. 46 Therefore, we assumed that D 13 was constant and it was calculated with eqn (10) using the listed diffusion coefficients for NH 4 + and SO 4 2À in ref. 64, p. 284.…”
Section: Resultsmentioning
confidence: 99%
“…With this restriction, there was no way to yield even qualitative agreement with all of the measured values of s. D 13 : binary diffusion coefficient measurements for aqueous ammonium sulfate show a fairly weak dependence on water activity when available data is extrapolated to low water activities. 46 Therefore, we assumed that D 13 was constant and it was calculated with eqn (10) using the listed diffusion coefficients for NH 4 + and SO 4 2À in ref. 64, p. 284.…”
Section: Resultsmentioning
confidence: 99%
“…The Taylor dispersion method for measuring diffusion coefficients is based on the work carried out by G. I. Taylor in 1953 and 1954. (3)(4)(5) This reliable and convenient technique (6)(7)(8)(9)(10)(11) is based on the dispersion of a very small amount of solution injected into a laminar carrier stream of solvent or solution of different composition flowing through a long capillary tube.…”
Section: Methodsmentioning
confidence: 99%
“…Using a value of 8.0 × 10 −6 cm 2 s −1 for the diffusion coefficient of ammonium sulfate in water at room temperature, 24 the diffusion time for a characteristic length scale given by the microchannel height (37 μm) is 1.71 s, significantly smaller than the residence times explored in this work which ranged from 42 s to 83 s, To verify this prediction, ammonium ion transport was evaluated through a two-dimensional numerical simulation of the device. As shown in Figure 4, the model suggests that the extra-liposomal ammonium ion content is reduced by more than 100 times from the initial concentration sequestered within the vesicles, a necessary condition for effective remote loading.…”
Section: Resultsmentioning
confidence: 99%
“…The Transport of Diluted Species (chds) physics interface was applied for the simulation to depict the concentration profiles of the ammonium sulfate salt within the microchannels. Microchannel dimensions from the actual devices fabricated and RC membranes used for the study were used to build the model, as well as the known value of the diffusion coefficient of ammonium sulfate in water at room temperature ( D = 8.0 × 10 −6 cm 2 s −1 ) 24 .…”
Section: Methodsmentioning
confidence: 99%