20.500.12556/DKUM-65240 Sinteza magnetnih nanodelcev, funkcionaliziranih s tanko plastjo silike Synthesis of magnetic nanoparticles functionalized with thin layer of silica V prispevku opisujemo pripravo maghemitnih nanodelcev prevlečenih s siliko. Postopek je potekal v treh ločenih stopnjah. V prvi smo delce sintetizirali s koprecipitacijo ionov Fe[na]{2+} in Fe[na]{3+}. V drugi smo delce prevlekli s citronsko kislino, da bi preprečili aglomeracijo, in jih dispergirali v vodi. Uspešnost dispergiranja smo spremljali z ugotavljanjem masnega deleža delcev, dispergiranih v vodi. Vsebnost delcev je odvisna od pH-vrednosti pri kateri secitronska kislina adsorbira na površini in koncentracije raztopljene citronske kisline. Tretja stopnja postopka je vsebovala prevlačenje nanodelcev s siliko, ki je potekalo v vodni suspenziji. Ključnega pomena za uspešno prevlačenje nanodelcev s siliko je stabilnost suspenzije nanodelcev oblečenih s citronsko kislino. In this paper we describe the synthesis of maghemite nanoparticles coated with silica. The process was divided into three separate steps. In first step we have synthesized particles with co-precipitation of Fe[sup]{2+} and Fe[sup]{3+} ions. In the second step the particles were coated with citric acid in order to prevent agglomeration and dispersed in water. The success of dispersion was determined by weight percent of dispersed particles in water. The quantity of dispersed particles depends on pH value at which the citric acid was adsorbed on the surface of particles and on the concentration of dissolved citric acid. The third step was coating the nanoparticles with silica, which took place in the water suspension. The key factor for successful coating of nanoparticles with silica is the stability of suspension of nanoparticles coated with citric acid. maghemit nanodelci citronska kislina silika vodna suspenzija maghemite nanoparticles citric acid silica water suspension true false true Slovenski jezik Angleški jezik Znanstveno delo 2017-03-23 15:09:52 2017-03-23 15:11:29 2022-07-07 03:08:51 2019-07-11 15:12:02 2007 0 0 str. 103-107 št. 2 Letn. 41 mar./apr. 2007 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1580-2949 537.622:532:532/533:620.1 106193664 604586 1580-2949 URN:SI:UM:DK:NMIYNA9N Materiali_in_Tehnologije_2007_Campelj_et_al._Sinteza_magnetnih_nanodelcev,_funkcionaliziranih_s_tanko_plastjo_silike.pdf Materiali_in_Tehnologije_2007_Campelj_et_al._Sinteza_magnetnih_nanodelcev,_funkcionaliziranih_s_tanko_plastjo_silike.pdf 1 C2941043B5A42F02C9FE1D0B9DBC9F72 fa7e27ba3a13ec50451cd51fa1694273a9a56bdecee3acd4ba4b5cac365a2306 030c583f-7c0e-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=110080 http://mit.imt.si/Revija/izvodi/mit072/campelj.pdf 1 https://dk.um.si/Dokument.php?lang=slv&id=110079 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0