The FPS COST Action FP1104 (New possibilities for print media and packaging combining print with digital) chaired by Dr Anu Seisto (VTT Finland) was organizing summer school for young researchers entitled »Science and engineering of printable electronics«. The lectures were the member of the COST and the students were coming from EU member countries. The lectures and workshops covered all practical aspects of printable electronics and were given by the expert on the field. The cited lecture covered the analytical methods needed to develop a good printable electronics device. Several practical examples were shown.
F.18 Transfer of new know-how to direct users (seminars, fora, conferences)
COBISS.SI-ID: 5582106The invention involves recording of the time in which temperature fluctuates above the upper or prescribed temperature used for maintaining the items in the cold chain. The temperature indicator operates via chemical and physical changes of the indicator material and thus does not need a power supply. The recorded information is readable under all circumstances that enable visual or video detection. The indicator irreversibly records the time of exceeding the predetermined temperature, which is lower than room temperature. When using on items in a cold chain, it also provides information about safety and quality (e.g. animal food).
F.33 Slovenian patent
COBISS.SI-ID: 5900570International prize for contribution on international conference 3rd European Symposium on Photocatalysis, September 25 27 2013, Portorož, Slovenia untitled: Photocatalytic undoped and doped nanotitania for building applications was received. Abstract of the awarded presentation: A photocatalytically active functional printing ink records exposure to UV light through reversible or irreversible change of colour. The change of colour can provide information necessary to protect ourselves against harmful effects of UV light by indicating the sufficient exposure to UV light in an easy recognizable and accurate way. In such inks chemically stable substances redox inks – are in contact with photocatalysts; illumination by UV light may disintegrate organic substances and change the ink’s colour. We have prepared and used such a photocatalytically active functional printing ink as a simple UV indicator. Ink was formulated applying hidroxiethylcelulose , photocatalyst (nanodimensional anatase), redox dye (2,6dichloroindophenol), glycerol, some additives, and water as a solvent. The mixture was applied on cardboard, paper and foil, by the cube applicator. Dried samples were exposed to UV light and analyzed colorimetrically by spectrophotometer (CIELAB colour values were measured in dependence on exposure time). We found out that the pH value of the functional printing ink and the applied substrate crucially influenced on the coluor of the samples. Additionally, the effect of amount of photocatalyst, reducing agent (glycerol) and UV radiation on colour change of inks were observed as well. The results confirm that it is possible to prepare UV indicators applying photocatalytically active functional printing ink.
E.02 International awards
COBISS.SI-ID: 2006119The thesis is dedicated to analysis of passive electronic elements which were prepared by screen printing. Commercially available printing inks were applied, including three types of silver-based conductive inks and one dielectric ink. The feasibility of four papers intended for conventional printing was analysed and compared with the results obtained for the samples prepared on the paper dedicated for printed electronics. The print forms were prepared for single- and three-layered elements. For preparation of samples screen printing technology was applied on the five selected substrate materials. Special attention was devoted to the properties of printing inks as a result of printing and drying processes and their influence on the electrical properties of final samples, especially the multi-layered ones. The electrical, thermal and chemical properties of the printed passive electronic components were analysed in details. The profiles and shapes of lines used in single-layered elements were evaluated together with the adhesion of the functional ink on the applied papers. The electrical resistivity of the conductive inks was studied as a function of screen density, type of paper substrate and drying conditions. The results confirm that the electrical conductivity depends on the examined printing parameters. The resistivity increases with the screen density and diminishes with drying temperature. The influence of surface roughness of the used paper substrates on electrical resistivity of prints was also evaluated. The preparation of the prints was optimized by proper selection of mesh density and drying conditions. The print quality of three-layered elements prepared as parallel-plate capacitors was also evaluated. Their electrical properties were thoroughly analysed with special attention on the material properties of the dielectric layer. The electrical functionality of capacitors was studied in terms of the state of polymerization of UV-curable dielectric layer, varied by the energy applied for curing. The boundary between the dielectric and conductor layers was analysed in dependence on the curing energy applied for dielectric layer in conditions of single- and double printed dielectric layer. It was shown that parallel-plate capacitors are feasible using single-printed dielectric layer only if the dielectric is completely polymerized. This way the thinnest possible dielectric is assured, thus the largest capacitance of the capacitor.
D.09 Tutoring for postgraduate students
COBISS.SI-ID: 279444992Basic properties of thermochromic materials were explained considering the three origins (absorption, reflection and scattering). The leucodye – based and liquid-crystalline materials were shown in more details. The abilities of these materials to be used in printing were regarded. The research of these materials going on at National Institute of Chemistry was reviewed. Much attention was devoted to current applications of thermochromic printing inks for packaging, which are currently rare, and the ability of different thermochromic materials for new applications in smart packaging, especially for irreversible temperature indicators. Lecture was goven on international forum of researchers working on the aea of smart packaging.
F.30 Professional assessment of the situation
COBISS.SI-ID: 5771546