Voda v ionskih tekočinah

Goste, Domen (author), Bešter Rogač, Marija (mentor)

Ionske tekočine so soli, ki imajo tališče pod 100°C. Zaradi svoje raznovrstnosti so pritegnile pozornost kot potencialna »dizajnerska« topila. Pri njihovi uporabi se pa lahko soočimo z nekaterimi neugodnimi aspekti, kot sta njihova visoka viskoznost in higroskopnost, zaradi česar se pogosto uporabljajo v kombinaciji z drugimi topili, predvsem z vodo. Delo obravnava ionske tekočine - predvsem tistih, na osnovi imidazolijevih kationov - in vplive vode na njihovo strukturo in lastnosti. V splošnem imajo takšne ionske tekočine precejšnjo stopnjo urejenosti, saj njihove alkilne verige kažejo težnjo po asociaciji, kar vodi v prisotnost bikontinuirnih nanostruktur v čistih ionskih tekočinah. Te se ohranjajo v prisotnosti vode do neke kritične koncentracije, kjer se hidrofobne tekočine z njo več ne mešajo ali pa tvorijo gele, pri hidrofilnih ionskih tekočinah pa se ta urejenost hitro poruši. Delo zaobjema tudi različne metode in njihove rezultate raziskovanja rezidualne vode v ionskih tekočinah ter njenih vplivov na strukturo in lastnosti ter njenega stanja, torej ali je voda v teh ionskih tekočinah vezana z drugimi molekulami vode, ali pa so njene molekule razpršene in med seboj nepovezane po celotni raztopini. Takšne raziskave lahko nudijo podrobnejši vpogled v kompleksne interakcije med molekulami vode in ionskimi tekočinami.

• Language: Slovenian
• Keywords: ionske tekočine, bikontinuirne nanostrukture, voda, viskoznost, higroskopnost, hidrofilnost
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Year: 2021
• PID: 20.500.12556/RUL-127573
• COBISS.SI-ID: 69526531
• Publication date in RUL: 15.06.2021

GOSTE, Domen, 2021, Voda v ionskih tekočinah [online]. Bachelor’s thesis. [Accessed 15 March 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=127573

Secondary language

• Language: English
• Title: Water in ionic liquids

Abstract

Ionic liquids are salts with melting points below 100°C. They have previously gained attention as potential designer solvents due to their versatility. Their use as such, however, poses some issues regarding their high viscosity and hygroscopicity. For this reason, they are often used in combinations with other solvents, especially water. This work deals mainly with imidazolium-based ionic liquids and the influence of water on their properties and structure. In general, such ionic liquids exhibit a significant degree of local ordering, as their long alkyl chains readily associate, leading to the presence of bicontinuous nanostructures in the bulk. These structures remain present in binary mixtures with water up to a critical point of its concentration, at which hydrophobic ionic liquids undergo phase separation or gel formation, whereas the order is broken in more hydrophilic ionic liquids. This work also includes descriptions and interpretations of the results of some methods that have been used to characterise residual water in terms of its influence on the structure and properties of ionic liquids, as well as the state of water at its lower concentrations, namely the tendency of its molecules to form clusters or remain disassociated and dispersed throughout the bulk. These studies could potentially provide a deeper insight into the complex interplay between water molecules and ionic liquids.

• Keywords: ionic liquids, bicontinuous nanostructures, water, viscosity, hygroscopicity, hydrophilicity