<p>U ovoj doktorskoj disertaciji proučavano je građenje kompleksa kobalta(II) sa hloridnim i bromidnim jonima u vodenim rastopima tipa xCa(NO3)2·zH<sub>2</sub>O – (1-x)NH<sub>4</sub>NO<sub>3 </sub>pri različitom sastavu soli (x= 0,3 – 0,9), različitom sadržaju vode (z= 2,67 – 6,67) i na različitim temperaturama (45, 55 i 65<sup>o</sup>C).</p><p>Istraživanja su imala za cilj proučavanje reakcije građenja kompleksa kobalta(II) sa hloridnim i bromidnim jonima u vodenim rastopima xCa(NO<sub>3</sub>)<sub>2</sub>·zH<sub>2</sub>O – (1–x)NH<sub>4</sub>NO<sub>3</sub>, uticaja temperature, sastava elektrolita i sadržaja vode na proces kompleksiranja, kao i određivanje termodinamičkih parametara koji karakterišu reakcije asocijacije u ovim sistemima. Ovakvi rastopi soli su posebno interesantni zbog svoje niske tačke topljenja i visoke latentne toplote topljenja pa se mogu koristiti kao fazno-promenljivi materijali za skladištenje toplotne energije.</p> / <p>In this thesis absorption spectra of cobalt(II) chloride and bromide in calcium nitrate – ammonium nitrate – water system of the composition xCa(NO<sub>3</sub>)<sub>2</sub>·zH<sub>2</sub>O – (1–x)NH<sub>4</sub>NO<sub>3 </sub>(x= 0.30 - 0.90 and z= 2.67 – 6.67) have been investigated in the wavelength range 400-800 nm at three different temperatures: 45, 55 and 65<sup>o</sup>C.</p><p>Temparature, composition of the melt and water content influence on complex formation reactions between cobalt(II) and halide ions in aqueous xCa(NO<sub>3</sub>)<sub>2</sub>·zH<sub>2</sub>O –<br />(1–x)NH<sub>4</sub>NO<sub>3</sub> melts have been studied. Thermodynamic parameters for cobalt(II) – halide association process in different solvents also were determined.</p><p>Investigated systems are interesting because of their high values of latent heat of fusion and low melting points. Due to these reasons, some melts are proposed for <br />heat energy storage materials, usually known as phase change materials (PCM).</p>
| Identifer | oai:union.ndltd.org:uns.ac.rs/oai:CRISUNS:(BISIS)83678 |
| Date | 23 February 2009 |
| Creators | Vraneš Milan |
| Contributors | Zsigrai István, Perišić-Janjić Nada, Mentus Slavko, Gadžurić Slobodan |
| Publisher | Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, University of Novi Sad, Faculty of Sciences at Novi Sad |
| Source Sets | University of Novi Sad |
| Language | Serbian |
| Detected Language | Unknown |
| Type | PhD thesis |
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