Naslov
Calorimetric and potentiometric investigation of specific ionic effects on polyelectrolytes in solution

Autori
Požar, Josip ; Kovačević, Davor

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

Izvornik
Workshop of Cost Action D43 "Functionalized Materials and Interfaces" / - , 2009, 23-23

Skup
Workshop of Cost Action D43 "Functionalized Materials and Interfaces"

Mjesto i datum
Chusclan, Francuska, 17.03.2009. - 19.03.2009

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
specific ionic effects ; calorimetry ; potentiometry ; poly(styrenesulphonate)

Sažetak
In order to gain a deeper thermodynamic insight into effects of an electrolyte added to aqueous solution of strong polyelectrolytes we performed microcalorimetric and potentiometric titrations of poly(sodium 4-styrenesulfonate) (NaPSS) solution with different alkali, earth- alkali and tetraalkylammonium salt solutions. Potentiometric titrations using sodium ion selective electrode have revealed that addition of electrolyte is accompanied by the increase in sodium activity until a certain critical value is reached, which seems to be the consequence of counterion substitution on the polyelectrolyte chain. The calorimetric titrations of NaPSS with the same electrolytes as stated above confirmed that the measured enthalpy changes could be related to the counterion substitution observed potentiometrically. The calorimetrically observed differences in sign and magnitude of enthalpy change upon addition of various electrolytes and corresponding differences in counterion affinities can be partially explained by the differences in cation hydration.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA