20.500.12556/DKUM-11802 SOL-GEL SINTEZA VOLFRAMOVIH BRONZ (Na x WO 3 ) SOL-GEL SYNTHESIS OF TUNGSTEN BRONZES (Na x WO 3 ) S sol—gel sintezo smo pripravili bronze NaxWO3 z x=0,66. Bronze NaxWO3 so najpogosteje raziskovane in x ima razpon od 0 do vključno 1, zato imajo tudi velik obseg lastnosti, ki znajo biti koristne. Našli smo novo pot za pripravo čiste bronze, ki je enostavnejša, ker ni potrebno uporabiti visokih temperatur, zato pa so potrebne drage kemikalije in dobit produkta zaenkrat še ni ekonomična. Sinteza je bila izvedena po dveh poteh. Obe poti sta izvedeni po sol—gel metodi, ki zajema hidrolizo in kondenzacijo prej pripravljenega 5% prekurzorja WO(OEt)4, raztopljenega v EtOH. En način priprave je direktna pot, kjer dodamo Na+ z dodatkom NaOEt in nato poteče hidroliza. Na+ nam ni potrebno več dodati po hidrolizi, saj ga že imamo v raztopini. Drugi način priprave je preko WO3, kjer nastopi hidroliza prekurzorja WO(OEt)4 in nato vključitev Na+ v WO3. Po sintezi smo kserogele kalcinirali pri 850 in 600°C ter jih nato analizirali z RPD (rentgenska praškovna difrakcija), na podlagi katere smo lahko ugotovili njihovo čistoto oziroma uspešnost sinteze. Using sol-gel synthesis, tungsten bronzes NaxWO3 with x=0.66 have been prepared. Bronzes NaxWO3 are the most often researched ones with x ranging from 0 to 1 (including), that is also why they have a wide range of potentially useful properties. A way has been found to prepare pure bronze without high temperatures, simplifying the procedure, but it is currently not economically viable due to the costly chemicals that are required. The synthesis can be performed in two ways. Both employ the sol-gel method, which involves the hydrolysis and condensation of the ready-made 5% precursor WO(OEt)4 diluted in EtOH. One way is a direct one, whereby Na+ with the addition of NaOEt is added, whereupon hydrolysis takes place. The other way is via WO3, where hydrolysis takes place on the precursor WO(OEt)4, and then Na+ binds to WO3. After the synthesis, the xerogels have been calcinated at 800°C and 650°C, and then analyzed with XRD (X-ray diffraction), which allowed to determine their purity and thus the effectiveness of the synthesis. natrij volframove bronze volframati sol–gel kalciniranje RPD sodium tungsten bronze tungstite sol-gel calcination XRD true true false [A. Rajbar] Slovenski jezik Angleški jezik Diplomsko delo 2009-09-17 18:11:37 2009-12-22 09:28:47 2022-04-12 00:13:22 2022-04-18 03:28:09 2009 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 544.77.022.822:66.081(043.2) 13904406 URN:SI:UM:DK:BJLBNXIA UNI_Rajbar_Ales_2009.pdf UNI_Rajbar_Ales_2009.pdf 1 9A7466577F104A62B2B6AE16ED89353B ddf164efde94aaf04d04c9e232048554577a0ea33d7246ab958229eae47b2805 3a86e2d8-7c03-11eb-bb7a-00155d0001ca 20.500.12556/dkum/f841317f-637c-4967-b638-e8c9cfbf82ce https://dk.um.si/Dokument.php?lang=slv&id=10744 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0