Naslov
Calorimetric Investigation of Specific Ionic Effects on Interactions of Oppositely Charged Polyelectrolytes

Autori
Požar, Josip ; Kovačević, Davor

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
COST Action D43: Colloid and Interface Chemistry for Nanotechnology, Joint Meeting of Workgroups 3, 4, 5, 6 / - , 2010, 14-14

Skup
COST D43: Joint Meeting of Workgroups 3, 4, 5, 6

Mjesto i datum
Genova, Italija, 16.03.2010. - 18.03.2010

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
polyelectrolytes ; polyelectrolyte complexes ; calorimetry ; ionic effects

Sažetak
Isothermal titration calorimetry, previously used for investigating the effects of an electrolyte added to aqueous solution of strong polyelectrolytes, was applied to examine the specific ionic effects on interactions of oppositely charged polyelectrolytes in solution. The aqueous solution of negatively charged polyelectrolyte (poly(sodium 4- styrenesulfonate), Na+PSS) was added into the calorimetric cell containing positively charged (poly(allylamine hydrochloride), PAH+Cl). The experiments were performed in the presence of different sodium salts at various salt concentrations. The heat effects resulting from the polyelectrolyte dilution were subtracted from the total measured heat. It was confirmed that isothermal titration calorimetry could be a useful tool for studying the formation of polyelectrolyte complexes and of the influence of different electrolytes on that process. The calorimetrically observed differences in sign and magnitude of complexation enthalpies in the presence of various electrolytes lead to the conclusion that differences in counterion affinities (partially due to the differences in counterion hydration) influence the process of polyelectrolyte complex formation.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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