Ternary Mutual Diffusion Coefficients from Error-Function Dispersion Profiles: Aqueous Solutions of Triton X-100 Micelles + Poly(ethylene glycol)
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Bibliographic record
Abstract
Taylor dispersion has gained widespread popularity for measuring diffusion in liquids. The usual procedure is to inject small volumes of solution containing solute at concentration c̄ + Δ c into carrier streams of composition c̄ . Binary mutual diffusion coefficients D are evaluated from the Gaussian distribution of the dispersed solute measured at the outlet of a long capillary tube. As a result of strong dilution of the injected solute with the carrier solution, obtaining favorable signal-to-noise ratios for the measured profiles can require unacceptably large Δ c values for solutions with strongly composition-dependent diffusion coefficients or broad dispersion profiles produced by slowly diffusing solutes. For these systems, D can be reliably evaluated from error-function profiles generated by changing the solution flowing into dispersion tube from composition c̄ − (Δ c /2) to c̄ + (Δ c /2). There are no dilution factors, so Δ c can be orders of magnitude smaller than the values employed in conventional pulse-injection techniques. In the present study, the error-function dispersion technique is extended to measure coupled diffusion in three-component solutions using small Δ c initial conditions. A least-squares procedure is developed to calculate ternary mutual D ik coefficients from profiles generated by changing the solution flowing into a dispersion tube from composition c̄ 1 − (Δ c 1 /2) and c̄ 2 − (Δ c 2 /2) to c̄ 1 + (Δ c 1 /2) and c̄ 2 + (Δ c 2 /2). D ik coefficients are measured for aqueous solutions of Triton X-100 + poly(ethylene glycol) at 25 °C to study the interactions between nonionic micelles and polymers.
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| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
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