1. Preparation and electrochemical characterization of aluminium liquid battery cells with two different electrolytes ($NaCl-BaCl_2-AlF_3-NaF$ and $LiF-AlF_3-BaF_2$)Viktor Napast, Jože Moškon, Marko Homšak, Aljana Petek, Miran Gaberšček, 2015, original scientific article Abstract: The possibility of preparation of operating rechargeable liquid battery cells based on aluminium and its alloys is systematically checked. In all cases we started from aluminium as the negative electrode whereas as the positive electrode three different metals were tested: $Pb$, $Bi$, and $Sn$. Two types of electrolytes were selected: $Na_3AlF_6-AlF_3-BaCl_2-NaCl$ and $Li_3AlF_3-BaF_2$. We show that some of these combinations allowed efficient separation of individual liquid layers. The cells exhibited expected voltages, relatively high current densities and could be charged and discharged several times. The capacities were relatively low (120 mAh in the case of $Al-Pb$ system), mostly due to unoptimised cell construction. Improvements in various directions are possible, especially by hermetically sealing the cells thus preventing salt evaporation. Similarly, solubility of aluminium in alloys can be increased by optimising the composition of positive electrode.
Keywords: liquid batteries, aluminium, alloy, electrochemistry
Published in DKUM: 24.08.2017; Views: 1390; Downloads: 339
 Full text (316,77 KB)
This document has many files! More... |
2. Impedance measurements on the passive layers of stainless different heat treated steelsMojca Slemnik, Valter Doleček, Miran Gaberšček, 2002, other scientific articles Abstract: The behavior of differently heat-treated X20Cr13 steels in 0.1 M H2SO4, was studied using the electrochemical impedance spectroscopy. Impedance spectra were recorded at constant passsive potentials of 0.2, 0.4 and 0.6 V vs. SCE, respectively. At low passive potential, 0.2 V vs. SCE, impedance spectra typical for an active - passive transition were observed. The assumption has been made, that they are the result of the adsorption process, caused by boundwater, which blocks the passive layer of steel and leads to corrosion rate reduction. The process is the most significant at the oil and the air-quenched, but less at the tempered steel. When more noble potentials are approached the impedance spectra become typical for passive metals and the value of resistance and capacitance differ from each other with respect to the heat treatment.
Keywords: korozija, nerjavna jekla, impedanca
Published in DKUM: 10.07.2015; Views: 1658; Downloads: 47
 Link to full text |
3. Polymer characterization with the atomic force microscopeUroš Maver, Tina Maver, Zdenka Peršin Fratnik, Miran Mozetič, Alenka Vesel, Miran Gaberšček, Karin Stana-Kleinschek, 2013, independent scientific component part or a chapter in a monograph Keywords: atomic force microscope, polymer characterization, polymer molecules
Published in DKUM: 10.07.2015; Views: 1645; Downloads: 96
Link to full text |
4. |
5. Use of AFM force spectroscopy for assessment of polymer response to conditions similar to the wound, during healingUroš Maver, Tina Maver, Andrej Žnidaršič, Zdenka Peršin Fratnik, Miran Gaberšček, Karin Stana-Kleinschek, 2011, original scientific article Abstract: Force spectroscopy is a very promising technique for the evaluation of interactions within different environments. Knowledge about them is especially important during the design and preparation of those modern wound dressings in contact with a changing wound-environment over a prolonged time. Such exposure can cause a drastic decrease in the materialćs mechanical performance, and can lead to degradation, thus lowering the success of any healing process. Our study tries to establish a model system, which would enable us to assess the applicability of the mentioned technique for the evaluation of any interaction changes between polymer molecules and a chosen surface, after exposure to different environments. Our proposed experimental setup consists of two representative polymers, a model silicon surface, and two solutions of various pHs and ionic strengths, respectively. Within the chosen range of parameters, we are confident that we can prove the usefulness of force spectroscopy for further research into polymer suitability, for the development of novel wound dressings.
Keywords: force spectroscopy, AFM, wound dressings, polymer materials, model system
Published in DKUM: 01.06.2012; Views: 2037; Downloads: 110
Full text (316,48 KB)
This document has many files! More... |
