20.500.12556/RUL-114081 Borofen kot aditiv za premaze visokotemperaturnih solarnih absorberjev Borophene as an additive for high temperature solar absorbers coatings Borofen kot aditiv za premaze visokotemperaturnih solarnih absorberjev Odkritje grafena je vzpodbudilo zanimanje za nove vrste, enoslojnih, tako imenovanih »2D materialov«. Med njimi je tudi borofen, ki je pritegnil pozornost zaradi svojih izjemnih kemijskih in mehanskih lastnosti, ki ponujajo možnosti uporabe v različnih aplikacijah. Ena izmed teh bi lahko bili visokotemperaturni solarni absorberji. Namen moje diplomske naloge je bil sintetizirati litij-bor zlitino in okarakterizirati plastovit bor, pridobljen iz sintetizirane zlitine. Začeli smo s sintezo zlitine litija in bora v suhi komori z argonovo atmosfero – »Glovebox«. Dobljeno zlitino smo raztapljali v vodi, s čimer smo odstranili litij, po filtraciji pa je ostal surovi bor. Vzorce smo dodatno čistili s klorovodikovo kislino. Bor smo želeli čim bolj razplastiti (eksfolirati) s pomočjo ultrazvoka. Sledila je karakterizacija z vrstičnim elektronskim mikroskopom (SEM), z mikroskopom na atomsko silo (AFM), izvedli pa smo tudi analizo BET in termično analizo sklopljeno z masno spektroskopijo. Rezultati SEM-a pred eksfoliacijo so pokazali, da smo pripravili bor z lamelarno strukturo. Po obdelavi z ultrazvokom pri različnih pogojih je vidno, da smo bili pri eksfoliranju delno uspešni. Z AFM-om smo ugotovili, da je debelina vzorca 188nm. Analiza BET je pokazala, da je specifična površina našega vzorca 3,59m^2/g. S termično analizo sklopljeno z masno spektroskopijo je bilo ugotovljeno, da je vzorec stabilen v inertni atmosferi pri visokih temperaturah, v kisikovi atmosferi pa do 590°C. Borophene as an additive for high temperature solar absorbers coatings Since the discovery of graphene, there has been an interest for a new, single-layered, so called »2D materials«. Among these materials is also borophene, which gained attention due to its unique chemical and mechanical properties. It holds promise for usage in various applications. One of those applications could be high temperature solar absorbers. The aims of my thesis were to synthesis lithium-boron alloy and characterize lamellar boron obtained from synthesized alloy. We started with the synthesis of lithium-boron alloy in a dry box with argon atmosphere – »Glove box «. After the synthesis we removed lithium by treating it with water and then filtered the suspension so we could obtain pure boron. The samples were additionally cleaned with hydrochloric acid. We tried to exfoliate boron, as much as possible, with an ultrasonic processor. Later on the sonication samples were characterized with scanning electron microscopy (SEM), atomic force microscopy (AFM), BET analysis, and a thermal analysis combined with mass spectrometric analysis. The results of SEM, before the exfoliation, revealed us we had synthesized boron with lamellar microstructure. After the sonication under various conditions, SEM images proved our success in exfoliation. With the AFM, we found out that the thickness of our sample was 188nm and with the BET analysis that the specific surface area of our sample was 3,59m^2/g. The results of thermal analysis combined with the mass spectrometric analysis showed that our sample is stable in an inert atmosphere, but in an oxygen atmosphere only up to 590°C. Ključne besede: Litij-bor zlitina borofen solarni absorber Key words: Lithium-boron alloy borophene solar absorber true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2020-02-13 09:20:01 2020-02-13 09:20:10 2022-08-26 03:49:00 0000-00-00 00:00:00 2020 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 5107 1538529987 Vesel_Neza_-_Borofen_kot_aditiv_za_premaze_visokotemperaturnih_solarnih_absorberjev.pdf Vesel_Neza_-_Borofen_kot_aditiv_za_premaze_visokotemperaturnih_solarnih_absorberjev.pdf 1 A8EE466C48DE0C888150A3C99651E205 2782cd11c29b1e3d237e8696506bac3d03f0219e154dd78e85316bb0d554efb5 2d24387c-a1b8-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=126194 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0