Small-angle x-ray scattering study of fluctuations in 1-propanol-water and 2-propanol-water systems

What is it about?

Small-angle X-ray scattering (SAXS) measurements have been carried out on the I-propanol (NPA)-water system and on the 2-propanol (1PA)-water system at 20 O C . In the NPA-water system, the zero angle intensity, the concentration fluctuation, the Kirkwood-Buff parameters, and Debye's correlation lengths have been determined at various concentrations. In the IPA-water system, the zero angle intensity and Debye's correlation lengths have also been determined. In both the NPA-water and IPA-water systems, all obtained parameters have maxima at about 0.2 of the mole fraction of alcohol. In terms of these parameters, the mixing state of the NPA-water and IPA-water systems is discussed and compared with that of the TBA-water system.

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Why is it important?

In the study of the solution having a complicated structure, such as NPA/IPA-water systems, the parameters that reflect the concentration fluctuation, the fluctuation in the particle number, and the Kirkwood-Buff parameters' are important. This SAXS study supplies these useful parameters for NPA/IPA aqueous solutions.