20.500.12556/DKUM-37159 Razvoj votlih nanosfer za uporabo v okoljevarstvu Development of hollow spheres for environmental applications Votle magnetne nanosfere imajo velik potencial v okoljevarstvu v senzorskih aplikacijah za določevanje prisotnosti onesnaževal in kot adsorpcijska sredstva za čiščenje težkih kovin iz voda. Njihova prednost pred nemagnetnimi nanodelci je v tem, da jih po uporabi lahko z zunanjim magnetnim poljem odstranjujemo in regeneriramo. Votle magnetne nanosfere so bile pripravljene z metodo oplaščanja predhodno pripravljenih trdnih jeder na osnovi SiO2 nanodelcev, z ovojnico iz magnetnih nanodelcev oz. magnetno fazo. Disolucijo jeder SiO2 ter s tem nastanek votlih nanosfer smo dosegli s pomočjo kombinacije dveh pufrov pri pH vrednosti 3. Uspešnost sinteze nanodelcev ter magnetnih votlih sfer smo okarakterizirali s pomočjo metod rentgenske praškovne difrakcije (XRD), presevne elektronske mikroskopije (TEM), z metodo analize specifične površine (BET), magnetizacijo z vibrirajočim vzorcem (VSM), infrardečo spektroskopijo s Fourier-jevo transformacijo (FTIR) ter vrstično elektronsko mikroskopijo (SEM). Hollow magnetic nanospheres have great potential in ecology in sensors applications for determination of pollutants or for adsorption and removal of heavy metal ions from water. After their use, they can be easily removed by external magnetic field and regenerated. We prepered magnetic nanospheres by core-shell method in which we used SiO2 nanoparticles as core or template and magnetic phase of nanoparticles for wrapping the templates or creating the shell arround the templates. Dissolution of SiO2 was achieved by combination of two buffers at pH 3. Effectiveness of synthesis of nanoparticles and magnetic hollow spheres was caracterized by methods such as X-ray diffraction (XRD), transmission electron microscopy (TEM), method BET for measuring the specific surface area, vibrating samplemagnetic measurement (VSM), Fourier transform infrared spectroscopy (FTIR) and by Scanning electron microscope method (SEM). nanotehnologija magnetizem železovi oksidi votle magnetne nanosfere nanotechnology magnetism iron oxides hollow magnetic nanospheres true true false [M. Lakić] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2012-08-17 12:31:53 2012-09-05 08:26:45 2022-04-22 11:13:00 2021-04-17 03:26:50 2012 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 544.725:628.3(043.3) 16453398 URN:SI:UM:DK:DMG0ZIM5 MAG_Lakic_Marijana_2012.pdf MAG_Lakic_Marijana_2012.pdf 1 A171B46BD98010CF0E9D8F4F7D4BA413 6b09a8aab75e59a246936229453e974a4575476f5b6387f20e9bb4494b4fe31a 3435d68d-7c08-11eb-bb7a-00155d0001ca 20.500.12556/dkum/a7d14bbc-6d4e-495f-a2e7-8120008bc912 https://dk.um.si/Dokument.php?lang=slv&id=49420 Fakulteta za strojništvo 0 0 0