20.500.12556/RUL-187532 In situ zelena sinteza srebrovih nanodelcev v matriki hitozana na viskozni tkanini In situ green synthesis of silver nanoparticles in chitosan matrix on viscose fabric V diplomskem delu je bila raziskana in situ sinteza srebrovih nanodelcev (Ag ND) v matriki hitozana na viskozni tkanini z uporabo kombuče kot okolju prijaznega redukcijskega in stabilizacijskega sredstva. Matrika hitozana je bila z 1,2,3,4-butantetrakarboksilno kislino (BTCA) zamrežena po dveh postopkih: pri enostopenjskem postopku (P1) sta bila hitozan in BTCA nanesena iz skupne impregnirne kopeli, pri dvostopenjskem postopku (P2) pa je bil najprej nanesen BTCA in nato hitozan. Sinteza Ag ND je potekala dve uri pri 35 °C v delno nevtralizirani kombuči ob dodatku 2 mM raztopine AgNO3. Analize morfoloških, kemijskih in optičnih lastnosti so potrdile uspešno in situ sintezo Ag ND, pri čemer je način zamreženja matrike hitozana pomembno vplival na njihovo porazdelitev in lastnosti. Postopek P1 je omogočil bolj homogeno porazdelitev Ag ND po površini vlaken ter izrazitejši pas lokalizirane površinske plazmonske resonance (LSPR) pri približno 420 nm, medtem ko je postopek P2 vodil do nastanka večjih lokalnih nanosov in aglomeratov. Oba funkcionalizirana vzorca sta pred pranjem ter po enem in petih pralnih ciklih izkazovala popolno inhibicijo rasti bakterij Escherichia coli in Staphylococcus aureus. Slednja se je po desetih pranjih zmanjšala, a je kljub temu vzorec, obdelan po postopku P1, izkazal zadovoljivo protibakterijsko aktivnost. Funkcionalizacija je nekoliko izboljšala UV-zaščitne lastnosti viskozne tkanine, povečala njeno upogibno togost, pri tem pa ni zmanjšala zračne prepustnosti. Skladno s povečano togostjo sta oba funkcionalizirana vzorca izkazala manjši raztezek pri pretrgu, pri čemer je postopek P1 vodil tudi do rahlega zmanjšanja pretržne sile, nasprotno pa je postopek P2 zagotovil povišanje pretržne sile in s tem učinkovitejši prenos nateznih obremenitev skozi tekstilno strukturo. Rezultati raziskave potrjujejo, da je način zamreženja hitozanske matrike ključni dejavnik pri oblikovanju mikrostrukture funkcionalnega sloja, ki določa porazdelitev Ag ND ter posledično optične, UV-zaščitne, protibakterijske in fizikalno-mehanske lastnosti funkcionaliziranega tekstila. Raziskava predstavlja trajnostni pristop k pripravi večfunkcionalnih tekstilij z uporabo naravnih reducentov in zmanjšano uporabo sintetičnih kemikalij. The diploma thesis investigated the in situ synthesis of silver nanoparticles (Ag NPs) within a chitosan matrix on viscose fabric using kombucha, as an eco-friendly reducing and stabilising agent. The chitosan matrix was crosslinked with 1,2,3,4-butanetetracarboxylic acid (BTCA) by two procedures: in the single-bath procedure (P1), chitosan and BTCA were applied from a common impregnation bath, while in the two-step procedure (P2), BTCA was applied first and chitosan subsequently. The synthesis of Ag NPs was carried out for two hours at 35 °C in partially neutralised kombucha with the addition of a 2 mM AgNO3 solution. The analyses of morphological, chemical and optical properties confirmed the successful in situ synthesis of Ag NPs, while the mode of chitosan crosslinking markedly influenced their distribution and properties. Procedure P1 provided a more uniform distribution of Ag NPs along the fibres and a more pronounced localised surface plasmon resonance (LSPR) peak at approximately 420 nm, whereas procedure P2 resulted in larger local deposits and agglomerates. Both functionalized samples exhibited complete inhibition of the growth of Escherichia coli and Staphylococcus aureus before and after one and five laundering cycles. Following ten laundering cycles, the antibacterial activity decreased; nevertheless, the sample treated according to P1 still demonstrated satisfactory antibacterial performance. Functionalization slightly improved the UV-protective properties of the viscose fabric and increased its bending rigidity without reducing its air permeability. Consistent with the increased stiffness, both functionalized samples exhibited lower elongation at break. In addition, procedure P1 resulted in a slight reduction in tensile strength, whereas procedure P2 led to its increase, indicating more efficient transfer of tensile loads through the textile structure. The results confirm that the crosslinking strategy of the chitosan matrix is a key factor governing the microstructure of the functional coating, which determines the distribution of Ag NPs and, consequently, the optical, UV-protective, antibacterial, and physico-mechanical properties of the functionalized textile. This study presents a sustainable approach for the preparation of multifunctional textiles by employing natural reducing agents while minimizing the use of synthetic chemicals. viskozna tkanina hitozan BTCA srebrovi nanodelci (Ag ND) zelena in situ sinteza kombuča protibakterijsko delovanje pralna obstojnost. viscose fabric chitosan BTCA silver nanoparticles (Ag NPs) green in situ synthesis kombucha antibacterial activity washing durability. true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2026-09-11 09:01:14 2026-09-11 09:01:23 2026-09-13 03:45:41 0000-00-00 00:00:00 2026 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1970-01-01 116448 30337.pdf 30337.pdf 1 AECDAECD61C55C16E282C5E7AC73D456 6ebc48a140b7dd4e12e0e76e52bbd22b776656e27f2f4564e91ef62eb9f5c4bc 93326320-adae-11f1-8bc5-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=247176 Naravoslovnotehniška fakulteta 0 0 0