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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

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Obrazovanje hloridnih i bromidnih kompleksa kobalta(II) u električki nesimetričnim vodenim rastopima soli / Cobalt(II) chloride and bromide complex formation in electrical unsymmetric aqueous molten salts

Vraneš Milan 23 February 2009 (has links)
<p>U ovoj doktorskoj disertaciji proučavano je građenje kompleksa&nbsp;kobalta(II) sa hloridnim i &nbsp;bromidnim jonima u vodenim&nbsp;rastopima tipa&nbsp;xCa(NO3)2&middot;zH<sub>2</sub>O&nbsp;&ndash; (1-x)NH<sub>4</sub>NO<sub>3&nbsp;</sub>pri različitom sastavu soli (x= 0,3 &ndash; 0,9), različitom sadržaju vode (z= 2,67 &ndash; 6,67) i na različitim temperaturama (45, 55 i 65<sup>o</sup>C).</p><p>Istraživanja su imala za cilj proučavanje reakcije građenja&nbsp;kompleksa kobalta(II) sa hloridnim i bromidnim jonima u&nbsp;vodenim rastopima xCa(NO<sub>3</sub>)<sub>2</sub>&middot;zH<sub>2</sub>O &ndash; (1&ndash;x)NH<sub>4</sub>NO<sub>3</sub>, &nbsp;uticaja&nbsp;temperature, sastava elektrolita i sadržaja vode na proces&nbsp;kompleksiranja, kao i određivanje termodinamičkih parametara&nbsp;koji karakteri&scaron;u reakcije asocijacije u ovim sistemima. Ovakvi&nbsp;rastopi soli su posebno interesantni zbog svoje niske tačke&nbsp;topljenja i visoke latentne toplote topljenja pa se mogu koristiti&nbsp;kao fazno-promenljivi materijali za skladi&scaron;tenje toplotne&nbsp;energije.</p> / <p>In this thesis absorption spectra of cobalt(II) chloride and&nbsp;bromide in calcium nitrate &ndash; ammonium nitrate &ndash; water&nbsp;system of the composition&nbsp; xCa(NO<sub>3</sub>)<sub>2</sub>&middot;zH<sub>2</sub>O &ndash; (1&ndash;x)NH<sub>4</sub>NO<sub>3&nbsp;</sub>(x= 0.30 - 0.90 and z= 2.67 &ndash; 6.67) have been&nbsp;investigated in the wavelength range 400-800 nm at three&nbsp;different temperatures: 45, 55 and 65<sup>o</sup>C.</p><p>Temparature, composition of the melt and water&nbsp;content influence on complex formation reactions between&nbsp;cobalt(II) and halide ions in aqueous xCa(NO<sub>3</sub>)<sub>2</sub>&middot;zH<sub>2</sub>O &ndash;<br />(1&ndash;x)NH<sub>4</sub>NO<sub>3</sub> melts have been studied. Thermodynamic&nbsp;parameters for cobalt(II) &ndash; halide association process in&nbsp;different solvents also were determined.</p><p>Investigated systems are interesting because of&nbsp;their high values of latent heat of fusion and low melting&nbsp;points. Due to these reasons, some melts are proposed for&nbsp;<br />heat energy storage materials, usually known as phase&nbsp;change materials (PCM).</p>

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