# Transport Properties in Multicomponent Systems Containing Cyclodextrins and Nickel Ions

## TL;DR

This study investigates how cyclodextrins affect the transport of nickel ions in water, aiming to improve solubility and reduce toxicity.

## Contribution

The paper presents new experimental data on diffusion coefficients of nickel ions with cyclodextrins using the Taylor dispersion method.

## Key findings

- Ternary mutual diffusion coefficients of nickel salts with α-CD, β-CD, and γ-CD were measured at 298.15 K.
- UV-vis spectroscopy complements diffusion data to understand solute-solvent interactions.
- Diffusion data can estimate moles of ions transported per mole of cyclodextrin.

## Abstract

In this work, we propose a comprehensive experimental study of the diffusion of nickel ions in combination with different cyclodextrins as carrier molecules for enhanced solubility and facilitated transport. For this, ternary mutual diffusion coefficients measured by Taylor dispersion method are reported for aqueous solutions containing nickel salts and different cyclodextrins (that is, α-CD, β-CD, and γ-CD) at 298.15 K. A combination of Taylor dispersion and other methods, such as UV-vis spectroscopy, will be used to obtain complementary information on these systems. The determination of the physicochemical properties of these salts with CDs in aqueous solution provides information that allows us to understand solute–solvent interactions, and gives a significant contribution to understanding the mechanisms underlying diffusional transport in aqueous solutions, and, consequently, to mitigating the potential toxicity associated with these metal ions. For example, using mutual diffusion data, it is possible to estimate the number of moles of each ion transported per mole of the cyclodextrin driven by its own concentration gradient.