20.500.12556/RUL-176684 Stabilnost vodnih suspenzij TiO$_2$ v prisotnosti nižjih alkoholov stability of aqueous suspensions of TiO$_2$ in the presence of low alcohols Nanodelci TiO$_2$ se uporabljajo v številnih tehnoloških procesih. Ker so netopni, je treba suspenzije stabilizirati in preprečiti njihovo agregacijo, ki vodi do izločanja nanodelcev. To smo poskušali doseči tako, da smo nanodelce suspendirali v mešanicah vode in alkoholov metanola, etanola in propan-2-ola. Poleg tega smo spreminjali pH, in sicer smo suspenzijam nastavili pH vrednosti 2, 7 in 10. Vpliv sestave medija in pH vrednosti na stabilnost suspenzij smo analizirali z merjenjem zeta potenciala in hidrodinamskega radija nanodelcev. Ugotovili smo, da je absolutna vrednost zeta potenciala nanodelcev TiO$_2$ najmanjša v prisotnosti propan-2-ola in največja v sistemih z metanolom. Agregati nanodelcev pa so največji tam, kjer je zeta potencial najmanjši. TiO$_2$ nanoparticles are used in numerous technological processes. Since they are insoluble, suspensions must be stabilized to prevent their aggregation, which leads to the separation of nanoparticles. We attempted to achieve this by suspending the nanoparticles in mixtures of water and methanol, ethanol, and propan-2-ol. In addition, we varied the pH by adjusting the suspensions to pH values of 2, 7, and 10. We analyzed the effect of the medium composition and pH value on the stability of the suspensions by measuring the zeta potential and the hydrodynamic radius of the nanoparticles. We found that the absolute value of the zeta potential of TiO$_2$ nanoparticles is lowest in the presence of propan-2-ol and highest in systems with methanol. Nanoparticle aggregates are largest where the zeta potential is lowest. titanov dioksid koloidna kemija zeta potencial hidrodinamski radij titanium dioxide colloid chemistry zeta potential hydrodynamic radius true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2025-12-09 09:35:02 2025-12-09 09:35:07 2026-01-16 11:59:44 0000-00-00 00:00:00 2025 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 25760 264985347 Cerkovnik_Gaber_-_Stabilnost_vodnih_suspenzij_TiO2_v_prisotnosti_nizjih_alkoholov.pdf Cerkovnik_Gaber_-_Stabilnost_vodnih_suspenzij_TiO2_v_prisotnosti_nizjih_alkoholov.pdf 1 F295A999AA194F322C83CEB033A457D5 ef86b34c2ca70a8cb7413968e1b9e8a5d3e10ff852a76377edd6762486854836 8d2bd355-d4d9-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=223180 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0