20.500.12556/RUL-155018 Sinteza magnetnih nanodelcev v mikropretočnem sistemu Synthesis of magnetic nanoparticles in a microfluidic system Zaradi potrebe po preprostejši in cenovno ugodnejši proizvodnji nanodelcev je ključno razviti nove tehnike sinteze. Eno izmed področij z velikim potencialom za razvoj novih sinteznih postopkov za izdelavo nanodelcev je mikrofluidika. Miniaturizacija procesov v mikropretočnih napravah omogoča intenzifikacijo ter bolj nadzorovano sintezo nanodelcev. Prav nadzorovani reakcijski pogoji namreč omogočajo sintezo monodisperznih nanodelcev. V okviru magistrskega dela smo se posvetili razvoju mikropretočnega sistema za kontinuirno sintezo magnetitnih nanodelcev. Pri tem smo preizkusili različne mikrofluidne naprave in primerjali njihove prednosti in slabosti. Prav tako smo v okviru magistrskega dela tudi izdelali mikroreaktor iz polidimetilsiloksana. To delo zajema meritve velikosti in zeta potenciala delcev sintetiziranih v mikrofluidnem sistemu, ki temelji na dodajanju reagentov v nestabilizirane kapljice. Pri tem smo tudi preverili vpliv dodatka različnih količin stabilizatorja citronske kisline. Rezultati kažejo, da se s povečanjem dodatka stabilizatorja premer delcev manjša, dokler ne pride do raztapljanja nanodelcev. Prav tako dodatek citronske kisline izboljša stabilnost nanodelcev, kar je tudi skladno z rezultati iz literature. S postopkom smo izdelali stabilne nanodelce velikosti okoli 100 nm in zeta potencialom višjim od 30. The need to make nanoparticles simpler and cheaper to produce makes it essential to develop new synthesis techniques. One area with great potential for the development of new synthesis processes for the production of nanoparticles is microfluidics. Miniaturization of processes in microfluidic devices allows for intensification and more controlled synthesis of nanoparticles. In fact, controlled reaction conditions allow the synthesis of monodisperse nanoparticles. In the framework of the MSc thesis, we focused on the development of a microflow system for the continuous synthesis of magnetite nanoparticles. In this context, different microfluidic devices were tested and their advantages and disadvantages were compared. We have also developed a microreactor made of polydimethylsiloxane as part of the master thesis. Particles synthesized in a microfluidic system based on the addition of reagents to unstabilized droplets were measured for size and zeta potential. The effect of the addition of different amounts of citric acid, which acts as a particle stabilizer, on the particle size was also verified. The results show that as the addition of the stabilizer increases, the particle diameter decreases until nanoparticle dissolution occurs. Also, the addition of citric acid improves the stability of the nanoparticles, which is also consistent with the results reported in the literature. The process produced stable nanoparticles with a size of about 100 nm and a zeta potential higher than 30. magnetit nanotehnologija mikrofluidika zeta potencial porazdelitev velikosti delcev magnetite nanotechnology microfluidics zeta potential particle size distribution true false false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2024-03-14 10:10:01 2024-03-14 10:10:07 2024-03-15 11:09:22 0000-00-00 00:00:00 2024 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 22133 189069827 Oblak_Urban_-_Sinteza_magnetnih_nanodelcev_v_mikropretocnem_sistemu.pdf Oblak_Urban_-_Sinteza_magnetnih_nanodelcev_v_mikropretocnem_sistemu.pdf 1 EBD4C2A376239A65FD5939AC82A32CC3 b517fd4f5032d26214931c24b6e7a433d58895085e658dc8b0d7a18ce866834f a88cce44-e1e2-11ee-b486-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=181732 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0