The main objective of this study was to broaden the assortment of I-/I3 redox ionic liquids using polyhedral oligomeric silsesquioxanes (PaSS) acting as nanobuilding blocks for the construction of functionalized 1,3-alkylimidazolium iodide solid (melting temperature lSD-200°C) and room temperature (RT) ionic liquids. The structural characteristics of the synthesised final ionic liquids and the corresponding intermediates were determined using 1H, 29Si NMR and infrared spectroscopic measurements. Raman spectra were next reported, in order to demonstrate the presence of polyiodides formed after the addition of iodine and the formation of redox electrolytes. Ionic conductivity values obtained from the impedance (EIS) spectra were determined in the temperature interval from room temperature up to 100°C. Finally, a hybrid electrochromic cell was constructed from room temperature MePrlm+Ix-I07T8 pass (x= 1, 1.2, 3 and 5) ionic liquids encapsulated between a lithiated W03 working and Pt counter-electrode, and colouring-bleaching changes assessed for cells cycled up to 1000 repetitive cycles.
COBISS.SI-ID: 4830746
The Langmuir-Blodgett (LB) method was used for depositing cubic polyhedral oligomeric silsesquioxanes (T8POSS) onto Au, indium tin oxide (ITO) and mica supports. Three different T8POSS were examined; two were amphiphilic and aggregated upon transfer to a solid support, while the highly symmetric POSS (termed MP8) gave stable and reproducible Langmuir films as studied by surface pressure and transfer ratio measurements. This was attributed to the eight identical alkanethiol groups located on each of the eight corners of the cubic like skeleton. The LB films were studied by RA-FTIR, XPS, contact angle and cyclic voltammetry. These techniques revealed the formation of a permeable, yet, stable layer. The symmetric MP8 was utilized as a bridging building block between the support and Au nanoparticles (Au-NPs). This assembly was examined by means of AFM, SEM and anodic oxidation of the nanoparticles. An average density of 1.45 * 109 nanoparticles cm-2 was obtained for the deposited Au-NPs on the MP8 layer. Furthermore, anodic stripping voltammetry was used for studying the extraction of Hg2+ by the MP8 LB film.
COBISS.SI-ID: 4783642
Degradation of dimethoate under UV irradiation using TiO(2)/polymer films prepared by the layer-by-layer (LbL) method was investigated. The degradation was monitored using HPLC analysis and TOC measurements as a function of irradiation time, to see the change in concentration of dimethoate and mineralization, respectively. Complete degradation of dimethoate was achieved under TiO(2) optimum loading of 4 g/L at an UV irradiation time of 180 min. The degradation byproducts were analyzed and confirmed by GC-MS. Toxicity of the irradiated samples was measured using the luminescence of bacteria Vibrio fischeri after 30 min of incubation and the results showed more toxicity than the parent compound.
COBISS.SI-ID: 1972987