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Funkcionalizacija grafena s polivinil alkoholom s pomočjo ultrazvočne kavitacije
Simaković, Julija (Author), Ručigaj, Aleš (Mentor) More about this mentor... This link opens in a new window

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Abstract
Grafen ali monoplast grafita je 2-D sloj, debel eno atomsko plast, kjer ogljikovi atomi tvorijo heksagonalno kristalinično strukturo. Grafen velja za najtanjši, najmočnejši in najtrši znan material. Zaradi svojih izjemnih in edinstvenih lastnosti, kot so velika površina, visoka natezna trdnost ter toplotna in električna prevodnost, ima grafen velik potencial za uporabo v kompozitnem inženirstvu. V polimernem kompozitu lahko že zelo nizek delež dodanega grafena bistveno izboljša električne, mehanske in pregradne lastnosti končnega kompozita. Tradicionalne metode funkcionalizacije grafena temeljijo na predhodno modificiranem grafenu in vključujejo več organskih stopenj sinteze. Največja pomanjkljivost teh metod je nizka produktivnost in dolgi reakcijski časi. Enostavnejši, okolju prijaznejši in ekonomsko ugodnejši način funkcionalizacije grafena s polimernimi verigami je mogoč z uporabo ultrazvoka, ki ustvarja akustično kavitacijo. V magistrski nalogi smo pokazali, da je pojav kavitacije odgovoren za uspešno funkcionalizacijo. Poleg tega smo pokazali tudi, da je ključni parameter, ki vpliva na uspešnost funkcionalizacije, intenziteta oziroma amplituda delovanja ultrazvoka.

Language:Slovenian
Keywords:grafen, PVA, funkcionalizacija, ultrazvočna kavitacija
Work type:Master's thesis/paper (mb22)
Tipology:2.09 - Master's Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Technology
Year:2020
COBISS.SI-ID:32589315 This link opens in a new window
Views:129
Downloads:50
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Secondary language

Language:English
Title:Ultrasonication-assisted funcionalization of graphene with polyvinyl alcohol
Abstract:
Graphene or graphite monolayer is a 2-D layer with thickness of one atomic layer, where carbon atoms form hexagonal crystalline structure. Graphene is considered to be the thinnest, strongest and hardest known material. Due to its exceptional and unique properties such as large surface area, high tensile strength, thermal and electrical conductivity, graphene has great potential for use in composite engineering. In a polymer composite, even a very low loading level of graphene can significantly improve electrical, physical, mechanical and barrier properties of composite. Traditional methods of graphene functionalization are based on previously modified graphene and involve multistep organic syntheses. These methods are time consuming and have low productivity. A simpler, more environmentally friendly and cost-effective way of functionalizing graphene with polymer chains is possible by using ultrasound, which creates acoustic cavitation. In this study we showed that the phenomenon of cavitation is responsible for successful functionalization. In addition, we also showed that the key parameter influencing the success of functionalization is the intensity or amplitude of ultrasound.

Keywords:graphene, PVA, functionalization, ultrasound cavitation

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