Vpliv ionskih tekočin na Krafftovo temperaturo surfaktantov

Jaklič, Iza (author), Šarac, Bojan (mentor)

Namen diplomske naloge je bil preučiti, kako dodatek treh ionskih tekočin ([MMIM]Cl, [EMIM]Cl, [BMIM]Cl) vpliva na Krafftovo temperaturo (T$_K$) natrijevega dodecil sulfata (SDS). Vrednost T$_K$ sem določala z merjenjem specifične električne prevodnosti raztopin v odvisnosti od temperature. Prvo sem določila vrednosti T$_K$ za 20, 30 in 40 mM SDS v vodi in nato za 40 mM SDS v 0,01 M raztopini ionskih tekočin. Ugotovila sem, da ionske tekočine znižajo vrednost T$_K$ ter da [BMIM]Cl, ki ima najdaljšo alkilno verigo, najbolj zniža T$_K$ zaradi največjega hidrofobnega značaja ionske tekočine. Rezultate za SDS v vodi sem primerjala z vrednostmi iz literature in ugotovila, da je vrednost T$_K$, ki sem jo določila, nižja od literaturne vrednosti. Odstopanje sem pripisala drugačnim eksperimentalnim pogojem in potencialno nečisti kemikaliji.

• Language: Slovenian
• Keywords: Ionske tekočine, surfaktanti, Krafftova temperatura
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Year: 2024
• PID: 20.500.12556/RUL-161037
• COBISS.SI-ID: 213271555
• Publication date in RUL: 06.09.2024

Secondary language

• Language: English
• Title: The impact of ionic liquids on the Krafft temperature of surfactants

Abstract

The aim of this thesis was to examine how the addition of three ionic liquids ([MMIM]Cl, [EMIM]Cl, [BMIM]Cl) affects the Krafft temperature (T$_K$) of sodium dodecyl sulfate (SDS). I determined T$_K$ by measuring the specific electrical conductivity of solutions as a function of temperature. First, I determined the T$_K$ values for 20, 30, 40 mM SDS in a 0,01 M solution of ionic liquids. I found that the ionic liquids lowered the T$_K$ value and that [BMIM]Cl, which has the longest alkyl chain, reduced T$_K$ the most due to the highest hydrofobic character of the ionic liquid. I compared the results for SDS in water with values from the literature and found that the T$_K$ value I determined was lower than the literature value. I attributed this deviation to different experimental conditions and potentially impure chemicals.

• Keywords: Ionic liquids, surfactants, Krafft temperature