@inproceedings{YfantisBourdasYfantisetal., author = {Yfantis, Alexandros D. and Bourdas, N. and Yfantis, N. and Yfantis, Alexandros D. and Lambrakopoulos, S. and Paloumpa, Ioanna and Schmeißer, Dieter}, title = {A study of anticorrosive conversion coatings based on conductive polymers of pyrrole}, language = {en} } @inproceedings{YfantisBourdasLambrakopoulosetal., author = {Yfantis, Alexandros D. and Bourdas, N. and Lambrakopoulos, S. and Yfantis, N. and Paloumpa, Ioanna and Yfantis, Alexandros D.}, title = {Conductive polymers precoats-application on metallisation of ABS}, language = {en} } @inproceedings{YfantisBourdasLambrakopoulosetal., author = {Yfantis, Alexandros D. and Bourdas, N. and Lambrakopoulos, S. and Yfantis, N. and Paloumpa, Ioanna and Yfantis, Alexandros D.}, title = {Primers of conductive polymers-application in powder coatings technology}, language = {en} } @article{PaloumpaYfantisHoffmannetal., author = {Paloumpa, Ioanna and Yfantis, Alexandros D. and Hoffmann, Patrick and Burkov, Yevgen and Yfantis, Alexandros D. and Schmeißer, Dieter}, title = {Mechanisms to inhibit corrosion of Al alloys by polymeric conversion coatings}, abstract = {We introduce a recently developed novel polypyrrole-based coating, which can be formed on the aluminium surface from an aqueous pyrrole solution of fluorozirconic and fluorotitanic acid neutralised with zinc oxide. The composite layer consists of polypyrrole (Ppy) chemisorbed on titanium and zinc oxides and exhibits advanced corrosion resistance. For the investigation of the structure and the corrosion mechanism of the composite corrosion resistant layer we use a photo-electron emission microscope (PEEM). PEEM is especially suitable because it can deliver topographic contrast as well as elemental contrast and chemical information in connection with a variable X-ray source. Additionally, in order to investigate further the corrosion mechanism, but also the role of the alloy in the corrosion process, we examine the aluminium samples with SEM/EDX. The structure of the corrosion resistant layer was investigated before and after accelerated corrosion tests. Our results pointed out the important role of titanium oxide and zinc in the corrosion resistance of our Ppy coating on aluminium.}, language = {en} } @article{SchmeisserPaloumpaHoffmannetal., author = {Schmeißer, Dieter and Paloumpa, Ioanna and Hoffmann, Patrick and Burkov, Yevgen and Yfantis, Alexandros D. and Yfantis, Alexandros D.}, title = {Preventing Corrosion of Aluminium Alloys by Polymeric Coatings}, abstract = {Aluminium is a material of everyday use in many applications,like automobile,aero-space or cookware,due to its specialproperties (low density,low weight,strength,easy to form and cast,abundance etc).Although aluminium is a reactive metal,italso has a significant corrosion resistance because of a thin,protective oxide layer which is generally stable in air and aqueous solutions.However,pores within the oxide film and other defects caused from alloying elements can lead to local corrosion and the formation of pits.}, language = {en} } @inproceedings{YfantisTsiniarakisLabrakopoulosetal., author = {Yfantis, Alexandros D. and Tsiniarakis, G. and Labrakopoulos, S. and Yfantis, Alexandros D. and Schmeißer, Dieter}, title = {Conductive polymers of pyrrole as pigments in organic anticorrosive coatings-application for aluminium alloys}, language = {en} } @article{YfantisAppelSchmeisseretal., author = {Yfantis, Alexandros D. and Appel, G{\"u}nter and Schmeißer, Dieter and Yfantis, Alexandros D.}, title = {Polypyrrole doped with fluoro-metal complexes: thermal stability and structural properties}, language = {en} } @article{YfantisPaloumpaSchmeisseretal., author = {Yfantis, Alexandros D. and Paloumpa, Ioanna and Schmeißer, Dieter and Yfantis, Alexandros D.}, title = {Novel corrosion-resistant films for Mg alloys}, abstract = {A novel method for the corrosion inhibition of Mg, alloys, based on the formation of a thin polyacrylic-polypyrrole film, is presented. The film was created after simpleimmersion of the samples in a specially formulated emulsion of polyacrylic and polypyrrole polymers. The synthesis conditions were studied, as well as the resultingcorrosion resistance of coated magnesium foils (AZ31) in terms of corrosion rate in neutral aqueous NaCl solutions. The relative ratio of polyacrylic polymer topolypyrrole was found to be important for the film properties. Furthermore, only in situ polymerisation of pyrrole in the polyacrylic emulsion can provide advancedcorrosion proper-ties in relatively thin films (2-5 mum). Blending of polypyrrole powder with the polyacrylic emulsion gives rise to thick films (20 mum) with reducedcorrosion-inhibition properties. The corrosion rate was only weakly dependent on the film thickness of these novel coatings. We argue that the mechanism of corrosioninhibition is related to the formation of a thin passive layer of chemisorbed polypyrrole polymers or oligomers on the native magnesium oxide of the C surface. Thestructure is further stabilised by polyacrylic polymer chains interacting as dopants of polypyrrole. The method is environmentally friendly: non-toxic chemicals are used,no rinsing is required, etc. The advanced corrosion-inhibition properties of the films. as well as the simple application process on the metal surface, provide significantpotential for the industrial application of the method.}, language = {en} } @article{YfantisYfantisTzalasetal., author = {Yfantis, Alexandros D. and Yfantis, Alexandros D. and Tzalas, B. and Schmeißer, Dieter}, title = {A new chrome - free passivation method of tinplate used in the canning industry}, language = {en} } @misc{HoffmannMikaloYfantisetal., author = {Hoffmann, Patrick and Mikalo, Ricardo Pablo and Yfantis, Alexandros D. and Batchelor, David R. and Appel, G{\"u}nter and Schmeißer, Dieter}, title = {A Spectro-Microscopic Approach for Thin Film Analysis Grain Boundaries in mc-Si and Sn/SnO2 Nano Particles}, series = {Microchimica Acta}, volume = {136}, journal = {Microchimica Acta}, number = {3-4}, issn = {1436-5073}, pages = {109 -- 113}, language = {en} } @inproceedings{HenkelEllingDanzetal., author = {Henkel, Karsten and Elling, B. and Danz, R. and B{\"u}chtemann, A. and Straube, Oliver and Paloumpa, Ioanna and Yfantis, Alexandros D. and Schmeißer, Dieter}, title = {Piezoelectric polymer sensor for high pressures in forming machines}, language = {en} } @article{YfantisSchmeisserKompotiatis, author = {Yfantis, Alexandros D. and Schmeißer, Dieter and Kompotiatis, L.}, title = {Polypyrrole based conversion coatings for aluminium alloys}, language = {en} } @phdthesis{Yfantis, author = {Yfantis, Alexandros D.}, title = {Development and Characterisation of Corrosion Resistent Layers of Conducting Polymers on Aluminium Alloys}, publisher = {Parissianou}, address = {Athen}, isbn = {960-394-115-8}, pages = {XI, 103}, language = {en} } @misc{YfantisPaloumpaSchmeisser, author = {Yfantis, Alexandros D. and Paloumpa, Ioanna and Schmeißer, Dieter}, title = {Corrosion Protection by Conductive Polymers for Magnesium Alloys}, series = {Magnesium, proceedings of the 6th International Conference on Magnesium Alloys and their Applications, November 2003 in Wolfsburg}, journal = {Magnesium, proceedings of the 6th International Conference on Magnesium Alloys and their Applications, November 2003 in Wolfsburg}, editor = {Kainer, Karl Ulrich}, publisher = {Wiley-VCH}, address = {Weinheim}, isbn = {3-527-30975-6}, pages = {605 -- 610}, abstract = {In this work, we present the experimental data related to the effect of the polypyrrole concentration and the film thickness on the corrosion inhibition properties of these novel polymer coatings. The relative corrosion resistance properties of the films formed from the matrix solutions, where polypyrrole was in situ polymerized and in cases where polypyrrole is dispersed in a form of powder (pigment) in the polyaclylic polymer, are further examined. The evaluation of the experimental data provides significant evidence regarding the mechanism of corrosion inhibition, as well as the optimization of the synthesis and application conditions.}, language = {en} } @misc{YfantisTzalasLambrakopoulosetal., author = {Yfantis, Alexandros D. and Tzalas, B. and Lambrakopoulos, S. and Anagnostaki, E. and Schmeißer, Dieter}, title = {New chrome free, environmentally friendly methods in chemical processes}, abstract = {It gives an overview of the research work to develop chrom-free methods in different chemical processes. A new class of materials, the conductive polymers, have been studied extensively for their anticorrosion properties.}, language = {en} } @misc{YfantisSchmeisser, author = {Yfantis, Alexandros D. and Schmeißer, Dieter}, title = {Method of chemical deposition of compose conductive polymer coatings on aluminium alloy surfaces}, language = {en} } @article{AppelYfantisGoepeletal., author = {Appel, G{\"u}nter and Yfantis, Alexandros D. and G{\"o}pel, W. and Schmeißer, Dieter}, title = {Highly conductive polypyrrole films on nonconductive substrates}, language = {en} } @misc{LamprakopoulosSchmeisserAnastassopoulouetal., author = {Lamprakopoulos, Stelios and Schmeißer, Dieter and Anastassopoulou, Jane and Theophanides, Theophile and Yfantis, Alexandros D.}, title = {An FTIR study of the role of H2O and D2O in the aging mechanism of conductive polypyrroles}, series = {Synthetic Metals}, volume = {144}, journal = {Synthetic Metals}, number = {3}, issn = {0379-6779}, doi = {10.1016/j.synthmet.2004.03.006}, pages = {229 -- 234}, abstract = {In the present work the role of H2O was studied by conductivity measurements and FTIR spectroscopy using the isotopic effect of deuterium in order to elucidate the aging mechanism of conductivity of polypyrroles. Polypyrrole was prepared with PTS as a dopant, by using deuterated water. Conductivity measurements showed changes due to structural water and atmospheric humidity. The FTIR absorption spectra indicated that the most probable structure of polypyrrole is the two-dimensional one. This finding could be attributed to the inhibition of polypyrrole's IR modes. The infrared spectrum analysis show that the gamma -NH bending mode of pyrrole has significantly changed after polymerization of pyrrole and this result is in accordance with XPS measurements.}, language = {en} } @article{AppelMikaloHenkeletal., author = {Appel, G{\"u}nter and Mikalo, Ricardo Pablo and Henkel, Karsten and Oprea, A. and Yfantis, Alexandros D. and Paloumpa, Ioanna and Schmeißer, Dieter}, title = {Polymeric Electrodes}, language = {en} } @article{SchmeisserBoehmeYfantisetal., author = {Schmeißer, Dieter and B{\"o}hme, O. and Yfantis, Alexandros D. and Heller, Thomas and Batchelor, David R. and Lundstr{\"o}m, Ingemar and Lloyd Spetz, Anita}, title = {Dipole moment of nanoparticles at interfaces}, language = {de} }