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Zelena in situ sinteza nanodelcev srebra na bombažni tkanini
Čuk, Nina (Author), Gorjanc, Marija (Mentor) More about this mentor... This link opens in a new window, Šala, Martin (Co-mentor)

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Abstract
V diplomskem delu je bila proučena in situ sinteza nanodelcev srebra na surovi bombažni tkanini. Kot prekurzor je bil uporabljen srebrov nitrat, kot reducenti pa vodni ekstrakti rastlinskih komponent živilskega odpadka (listi zelenega čaja, koščice avokada in olupki granatnega jabolka) in invazivnih tujerodnih rastlinskih vrst (korenika japonskega dresnika, plodovi octovca in cvetovi zlate rozge). Za primerjavo je bila bombažna tkanina obdelana tudi samo v reducentih. Barvne vrednosti (vrednosti CIE L*a*b*) vzorcev in globina obarvanja (vrednosti K/S) so bile določene z refleksijskim spektrofotometrom. Zaščitne lastnosti obdelanih vzorcev proti ultravijoličnem sevanju (vrednosti UZF) so bile določene z uporabo UV-Vis spektrofotometra. Morfologija vlaken oziroma oblikovanih nanodelcev je bila opazovana z vrstično elektronsko mikroskopijo (SEM). Vsebnost srebra na vzorcih je bila določena z masno spektrometrijo z induktivno sklopljeno plazmo (ICP-MS). Vzorcem, kjer je bila in situ sinteza izvedena, so bile proučene tudi njihove protimikrobne lastnosti. Vodni rastlinski ekstrakti so reducirali srebrov nitrat v krogelno oblikovane nanodelce z različno velikostjo in vsebnostjo glede na posamezen reducent. Le-to je vplivalo na uspešnost redukcije rasti bakterij Escherichia coli in Staphylococcus aureus, ki je bila pri vseh tako obdelanih vzorcih odlična. Odlična zaščita proti UV-sevanju je bila izmerjena tako za vzorce z vsebnostjo srebra kot tudi za večino tistih brez prisotnosti srebra. Po večkratnih pranjih vzorci s formiranimi srebrovimi nanodelci še vedno nudijo odlično zaščito proti UV-sevanju, ostali obdelani vzorci pa so uvrščeni v prav dobro ali dobro zaščitno kategorijo. Prisotnost srebrovih nanodelcev vpliva tudi na temnejše barve, ki se odražajo v bolj rdečkastih in rumenkastih barvnih odtenkih. Po pranju večina vzorcev postane svetlejših in modrikastih.

Language:Slovenian
Keywords:in situ sinteza, srebrovi nanodelci, invazivne tujerodne rastline, rastlinske komponente živilskega odpadka
Work type:Bachelor thesis/paper (mb11)
Organization:NTF - Faculty of Natural Sciences and Engineering
Year:2019
Views:409
Downloads:230
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Secondary language

Language:English
Title:Green in situ synthesis of silver nanoparticles on cotton fabric
Abstract:
In situ synthesis of silver nanoparticles on raw cotton fabric was studied for Diploma thesis. Synthesis occurred directly on cotton when it was immersed in precursor solution of silver nitrate and after in water-extracts of food waste plant materials (green tea leaves, avocado seed and pomegranate peel) and invasive alien species (Japanese knotweed rhizome, Staghorn sumac fruit and Goldenrod flowers). For comparison, the cotton fabrics were treated also only with water-extracts. Colour values (CIE L*a*b) and colour depth (K/S values) were determined using a reflectance spectrophotometer. Ultraviolet protective properties of the samples (UPF values) were analysed using UV/VIS spectrophotometer. The morphology of fibres and formed nanoparticles was analysed using scanning electron microscopy (SEM). Silver content was determined using inductively coupled plasma mass spectrometry (ICP-MS). Antibacterial properties of the samples, where in situ synthesis was performed, were also analysed. Different size and content of spherical shaped nanoparticles were formed on fibres using water-extracts as reducing agents. Size and shape of silver nanoparticles influence the reduction of Escherichia coli in Staphylococcus aureus bacteria. The antimicrobial properties were excellent for the samples with synthesized nanoparticles. Furthermore, excellent protection against ultraviolet radiation was determined for the samples without and with formed nanoparticles. After twelve times washing cycles, the samples with silver nanoparticles still show excellent protection against ultraviolet radiation, all other sample were classified with very good or good protection category. The presence of nanoparticles on cotton also influences its colour, which is darker, with reddish and yellowish hue. Most of the samples become lighter and bluish after repetitive washings.

Keywords:in situ synthesis, silver nanoparticles, food waste plant materials, invasive alien species

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