Researchers from the Department of Chemistry Tin Klačić and Davor Kovačević, in collaboration with Adam Jugl and Miloslav Pekař (Faculty of Chemistry, Brno University of Technology, Czech Republic), have published the scientific publication High-Resolution Ultrasonic Spectroscopy: Looking at the Interpolyelectrolyte Neutralization from a Different Perspective in the prestigious journal of the American Chemical Society Macromolecules (IF 6.057).
The published paper presents the results of the study in which high-resolution ultrasonic spectroscopy (HR-US) technique was, for the first time, applied to examine interpolyelectrolyte neutralization. The mentioned method was tested on the example of complexation between poly(allylammonium) cation and poly(acrylate) anion in aqueous solutions at pH = 7.0. It was confirmed by HR-US that the type of titration (stepwise or abrupt), the direction of titration, and the type of background salt affect the outcome of interpolyelectrolyte neutralization. The obtained results were explained on the basis of ultrasonic velocity and attenuation changes in the context of suspension compressibility, a parameter that is extremely sensitive to the molecular organization and intermolecular interactions. This research demonstrates that HR-US is a convenient and reliable method that can be employed for the investigation of interpolyelectrolyte neutralization and polyelectrolyte-related processes.
The research was performed as a part of the Croatian-Slovenian bilateral research project Modulation of fruit polyphenolic profile by sustainable postharvest physical treatments (APPLPEMs, IPS-2020-01-6126) funded by the Croatian Science Foundation.
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