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Title:SOL-GEL SINTEZA VOLFRAMOVIH BRONZ (Na x WO 3 )
Authors:ID Rajbar, Aleš (Author)
ID Novak, Zoran (Mentor) More about this mentor... New window
ID Knez, Željko (Comentor)
Files:.pdf UNI_Rajbar_Ales_2009.pdf (5,58 MB)
MD5: 9A7466577F104A62B2B6AE16ED89353B
PID: 20.500.12556/dkum/f841317f-637c-4967-b638-e8c9cfbf82ce
 
Language:Slovenian
Work type:Undergraduate thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract: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.
Keywords:natrij volframove bronze, volframati, sol–gel, kalciniranje, RPD
Place of publishing:Maribor
Publisher:[A. Rajbar]
Year of publishing:2009
PID:20.500.12556/DKUM-11802 New window
UDC:544.77.022.822:66.081(043.2)
COBISS.SI-ID:13904406 New window
NUK URN:URN:SI:UM:DK:BJLBNXIA
Publication date in DKUM:22.12.2009
Views:2936
Downloads:231
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
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Secondary language

Language:English
Title:SOL-GEL SYNTHESIS OF TUNGSTEN BRONZES (Na x WO 3 )
Abstract: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.
Keywords:sodium tungsten bronze, tungstite, sol-gel, calcination, XRD


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