Naslov
Potentiometric Determination of Reaction Enthalpies at Silicon Nitride/Water Interface

Autori
Kallay, Nikola ; Bišćan, Jasenka ; Smolić, Tomislav ; Žalac, Suzana ; Krajnović, Maja

Izvornik
Polish Journal of Chemistry (0137-5083) 71 (1997); 594-602

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
silicon nitride; thermodynamics; point of zero charge; surface reactions

Sažetak
The enthalpies of surface reactions at Si_3N_4/water interface are determined from the temperature dependence of the point of zero charge (p.z.c.). The p.z.c. is determined by the mass titration method. According to the surface complexation model, the surface charge is a result of protonation and deprotonation of amphoteric surface sites. For Si_3N_4 the main surface groups are silanol (Si-OH) and silazane (Si_2=NH). The temperature dependence of p.z.c. yields the standard enthalpies of deprotonation of silanol groups (12 kJ/mol) and the standard enthalpy of protonation of silazane groups (-44 kJ/mol).

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA