Vpliv dodatka plastovitih nanodelcev na reološke lastnosti hidrogela iz skleroglukana

Krajec, Gašper (author), Šebenik, Urška (mentor)

Nanokompozitni hidrogeli so sestavljeni iz polimera in nanodelcev, kot so glina, grafen in grafen oksid. Prisotnost nanodelcev izboljša mehansko odpornost in termično stabilnost hidrogelov. Trend zelene kemije spodbuja uporabo obnovljivih, netoksičnih, naravnih in biorazgradljivih polimerov, med katere spada tudi skleroglukan. Skleroglukan je naravni polisaharid, ki v vodnih raztopinah tvori fizikalno zamrežen hidrogel, ki je obstojen v širokem območju pH vrednosti in izkazuje psevdoplastične lastnosti. V svojem magistrskem delu sem preučeval vpliv dodatkov plastovitih nanodelcev na reološke lastnosti hidrogela iz skleroglukana. Izbral sem si naslednje dodatke: glino (Cloisite 30B, Cloisite Na+, Laponite RD), grafen in grafen oksid. Ugotovil sem, da vrsta in količina dodanega plastovitega nanomateriala vpliva na reološke lastnosti hidrogela iz skleroglukana. Na reološke lastnosti vpliva tudi staranje in sprememba pH vrednosti. Na osnovi rezultatov reoloških testov sem sklepal na vrsto interakcij med delci skleroglukana in nanodelci, ki imajo lahko hidrofilno bodisi hidrofobno naravo.

• Language: Slovenian
• Keywords: hidrogel, skleroglukan, plastoviti nanodelci, reologija
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Year: 2022
• PID: 20.500.12556/RUL-137820
• COBISS.SI-ID: 116238595
• Publication date in RUL: 01.07.2022

Secondary language

• Language: English
• Title: Influence of layered nanoparticles addition on the rheological properties of scleroglucan hydrogel

Abstract

Nanocomposite hydrogels are composed of polymer and nanoparticles, such as clay, graphene and graphene oxide. The presence of nanoparticles improves mechanical resistance and thermal stability of hydrogels. Green chemistry trend promotes the use of renewable, non-toxic, natural and biodegradable polymers, including scleroglucan. Scleroglucan is a natural polysaccharide that forms a physically cross-linked hydrogel in aqueous solutions, which is stable in a wide pH range and exhibits pseudoplastic properties. In my master’s thesis, I studied the influence of layered nanoparticles addition on the rheological properties of scleroglucan hydrogels. I selected the following additives: clay (Cloisite 30B, Cloisite Na+, Laponite RD), graphene and graphene oxide. I found out that the type and amount of layered nanomaterial addition affects the rheological properties of scleroglucan hydrogel. Rheological properties are also affected by aging and changes in pH values. Based on the results of the rheological tests, I concluded type of interactions between scleroglucan particles and nanoparticles, which may be hydrophilic or hydrophobic nature.

• Keywords: hydrogel, scleroglucan, layered nanoparticles, rheology