Sveučilišta u Zagrebu
| Naslov (engleski) | Insights into the Thermodynamics of Surface Reactions at the SiO2(s) / NaCl(aq) Interface |
| Autor | Karla Korade University of Zagreb |
| Autor | Tajana Begović |
| Suradnik | Tajana Begović (Researcher) University of Zagreb |
| Znanstveno / umjetničko područje, polje i grana | PRIRODNE ZNANOSTI Kemija Fizikalna kemija |
| Sažetak (engleski) | This study investigates the behaviour of silica nanoparticles suspended in an aqueous sodium chloride solution during wetting, as well as changes in pH and sodium chloride concentration. We examine the processes and interactions at the silica/aqueous electrolyte solution interface, which involve reactions among water molecules, dissolved ions and the electrically charged silica surface. The nanoparticles were characterized using dynamic light scattering and electrokinetic measurements to determine their size, electrokinetic potential, and stability in acidic conditions. We performed three types of calorimetric experiments with both a dissolution calorimeter and an isothermal titration calorimeter to analyse the thermodynamics of surface processes on the silica nanoparticles. Through theoretical analysis, we distinguished between the contributions of silica surface protonation and sodium ion association. Our findings reveal that the enthalpy change resulting from immersing dry silica nanoparticles in aqueous sodium chloride is exothermic. Importantly, the enthalpies associated with protonation are independent of pH and ionic strength, while those related to sodium ion association are affected by both pH and the charge of the silica nanoparticle surface. |
| Metodologija (engleski) | Potentiometric acid-base titrations, sodium ion selective electrode, isothermal titration calorimetry, dissolution calorimetry, dynamic light scattering and electrophoretic measurements. |
| Ključne riječi (engleski) | |
| Jezik | engleski |
| URN:NBN | urn:nbn:hr:217:895423 |
| Datum objave | 2024-11-27 |
| Datum dostupnosti | 2025-12-31 |
| Geolokacija | Zagreb, Horvatovac 102a, Hrvatska |
| Projekt | Šifra: IP-2020-02-9571 Naziv (hrvatski): Fizikalna kemija procesa na međupovršini mineral/otopina (poli)elektrolita Naziv (engleski): Physical chemistry of processes at mineral/(poly)electrolyte solution interface Kratica: POLYMIN2 Voditelj: Tajana Begović Pravna nadležnost: Hrvatska Financijer: Hrvatska zaklada za znanost Linija financiranja: Research Projects |
| Izdavač | Prirodoslovno-matematički fakultet Faculty of Science |
| Prava pristupa | Zatvoreni pristup |
| Uvjeti korištenja |  |
| Javna napomena (hrvatski) | Podaci su dostupni na zahtjev. |
| Datum i vrijeme pohrane | 2024-11-27 11:11:01 |
