University of Zagreb
| Title (english) | Insights into the Thermodynamics of Surface Reactions at the SiO2(s) / NaCl(aq) Interface |
| Author | Karla Korade University of Zagreb |
| Author | Tajana Begović |
| Collaborator | Tajana Begović (Researcher) University of Zagreb |
| Scientific / art field, discipline and subdiscipline | NATURAL SCIENCES Chemistry Physical Chemistry |
| Abstract (english) | 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. |
| Methods (english) | Potentiometric acid-base titrations, sodium ion selective electrode, isothermal titration calorimetry, dissolution calorimetry, dynamic light scattering and electrophoretic measurements. |
| Keywords (english) | |
| Language | english |
| URN:NBN | urn:nbn:hr:217:895423 |
| Publication | 2024-11-27 |
| Available | 2025-12-31 |
| Geolocation | Zagreb, Horvatovac 102a, Croatia |
| Project | Number: IP-2020-02-9571 Title (croatian): Fizikalna kemija procesa na međupovršini mineral/otopina (poli)elektrolita Title (english): Physical chemistry of processes at mineral/(poly)electrolyte solution interface Acronym: POLYMIN2 Leader: Tajana Begović Jurisdiction: Croatia Funding stream: Research Projects |
| Publisher | Prirodoslovno-matematički fakultet Faculty of Science |
| Access conditions | Closed access |
| Terms of use |  |
| Public note (croatian) | Podaci su dostupni na zahtjev. |
| Created on | 2024-11-27 11:11:01 |
