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Study of transistor properties with ionic liquids
Mitáčková, Martina ; Pospíšil, Jan (referee) ; Zmeškal, Oldřich (advisor)
This diploma thesis is focused on the study of electric and dielectric properties of transistors based on ionic liquids. The measurements were performed on organic electrochemical transistors with a semiconducting channel made of PEDOT:PSS, which were firstly prepared on ITO substrates, later they were printed using 3D print. Ionic liquid NO4 (1-butyl-3-methylimidazolium hydrogensulfate) was used for measuring of the properties. Electrical properties were determined by measuring volt-ampere characteristics, dielectric properties were measured by impedance spectroscopy.
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Gel Polymer Electrolytes Based On MMA With Ionic Liquids
Jahn, Michal
Gel polymer electrolytes are perspective electrolytes for new types of Li-ion batteries today. The properties respectively advantages of these gels can be used also in other fields of electrochemistry. Very promising combination can be electrochemically stable polymers and ionic liquids, which are substances that consist of an organic cation and an inorganic or organic anion, with a melting point below 100 °C. Main advantages of ionic liquids are high ionic conductivity, inflammability and excellent electrochemical stability. These ionic liquids may be suitable for new lithiumion batteries and supercapacitors, especially where the required higher thermal stability. In this paper, I will present fundamental characteristics of gel polymer electrolytes with ionic liquids.
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Study of Electric and Dielectric Properties of Ionic Liquids
Altšmíd, Jakub ; Boušek, Jaroslav (referee) ; Mikula, Milan (referee) ; Nešpůrek, Stanislav (advisor)
Dizertační práce je zaměřena na studium elektrických a dielektrických vlastností iontových kapalin. Iontové kapaliny mohou nacházet uplatnění v široké škále aplikací, především pak v elektrotechnice. Teoretická část se věnuje popisu základních vlastností iontových kapalin a možností jejich uplatnění v kondenzátorech a elektrochemických senzorech plynů. Experimentální část se věnuje použitým metodám charakterizace vlastností iontových kapalin, jsou zde popsány teoretické poznatky o dielektrické spektroskopii včetně metod stanovení fyzikálních vlastností a vyhodnocení experimentálních dat. Experimentální část je rozdělena na dvě základní části. První se věnuje studiu iontových kapalin pro použití jako elektrolytu v kondenzátorech, druhá část se věnuje studiu vlastností připravených experimentálních senzorů na NO2, zejména vlivem vlastností iontových kapalin na sledované parametry senzoru.
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Study of electrical and dielectric properties of ionic liquids
Mitáčková, Martina ; Pospíšil, Jan (referee) ; Zmeškal, Oldřich (advisor)
This bachelor thesis is focused on the study of electrical and dielectric properties of ionic liquids. Two types of OECT substrates with different semiconductor channel lengths made of PEDOT:PSS were used to measure these properties. The dielectric properties were measured by impedance spectroscopy, where the dependence of the impedance value and its phase angle on the voltage frequency was measured. It was found from V-A characteristics, that the best closing of semiconductor layer occurs at a positive UGD voltage. The switching speeds of different ionic liquids were compared for this voltage.
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Partition Coefficients Octanol-water of Selected (–)-Menthol-Substituted Chiral Ionic Liquids.
Andresová, Adéla ; Feder-Kubis, J. ; Florianová, M. ; Basarabová, B. ; Čubová, K. ; Bendová, Magdalena
Octanol-water partition coefficients, log P, may be considered as one of the indicators for the tendency to bioaccumulation. For this reason, log P was measured as a function of the alkyl chain length on the cation for selected species of the 1–[(1R, 2S, 5R)-(–)-menthoxymethyl]-3-alkylimidazolium chloride ionic liquid series. The data were processed by means of mathematical gnostics to evaluate the relationship between the structure of the studied ionic liquids and log P.
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Physicochemical Characterization of Chiral Ionic Liquids for Their Applications.
Andresová, Adéla ; Bendová, Magdalena ; Wagner, Zdeněk ; Husson, P. ; Feder-Kubis, J. ; Traïkia, M.
In this work, we address a thermodynamic characterization of a homologous series of 1–[(1R, 2S, 5R)-(–)-menthoxymethyl]-3-alkylimidazolium bis{(trifluoromethyl)sulfonyl} imide ionic liquids. The alkyl chain length ranges from methyl to dodecyl. In this study, our attention is focused on the thermodynamic properties of the pure CILs, i.e. on their heat capacities, densities, viscosities, and self-diffusion coefficients of the cations. The second level is to gain a deeper understanding of the structure-property relationships. Data analysis was carried out by means of mathematical gnostics.
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