149 research outputs found
ElektronvezetĹ‘ polimer alapĂş összetett (kompozit) anyagok előállĂtása Ă©s tulajdonságaik tanulmányozása in situ kombinált elektrokĂ©miai technikákkal = Preparation of electronically conducting polymer based composite materials and their characterization by in situ combined electrochemical techniques
A kutatás tĂ©mája elektronvezetĹ‘ tulajdonságĂş polimer alapĂş összetett anyagok előállĂtása Ă©s tulajdonságaik tanulmányozása in situ kombinált elektrokĂ©miai technikákkal. A kutatási program kiterjedt fĂ©met tartalmazĂł kompozitanyagokra, elsĹ‘dlegesen nemesfĂ©mek beĂ©pĂtĂ©sĂ©re, a inhibĂtorokat tartalmazĂł polimerrĂ©tegek korrĂłziĂłvĂ©dĹ‘ hatására, nanoszerkezetű összetett anyagok vizsgálatára, nanodiszperz fĂ©mekkel Ă©s oxidokkal adalĂ©kolt polipirrol Ă©s politiofĂ©n rĂ©tegek vezetĂ©si sajátságaira, valamint biolĂłgiai hatásuk folytán fontos anyagok polimerrĂ©tegekbe törtĂ©nĹ‘ beĂ©pĂtĂ©sĂ©re Ă©s segĂtsĂ©gĂĽkkel elektro-biotechnolĂłgiai folyamatok megvalĂłsĂtására. Kutatási eredmĂ©nyeinkbĹ‘l eddig 8 folyĂłiratcikk jelent meg, melyek összesĂtett hatástĂ©nyezĹ‘je mintegy 20. MunkánkrĂłl 15 nemzetközi konferencián is beszámoltunk. A kutatásba bekapcsolĂłdott hallgatĂłk eredmĂ©nyeiket a XXVIII. Országos Tudományos Diákköri Konferencián is bemutatják. | The aim of the project was the synthesis of electronically conducting polymer composites and their study by in situ combined electrochemical techniques. The research programme included studies on metal containing composites, incorporation of noble metals, the potential use of inhibitor containing polymer layers in the protection against corrosion, nanostructured composite materials, the conducting behaviour of polypyrrole and polythiophene films doped with nanodispersed metals and oxides, as well as the immobilization of biologically important materials into polymer layers and their use in the realization of electro-biotechnological processes. The results have been published in 8 papers by now, their cumulative impact is about 20, and have been reported at 15 international conferences. The undergraduate students involved in the work present their results also at the XXVIII. National Scientific Conference of Students
Ăšj tulajdonságokat mutatĂł elektronvezetĹ‘ polimerek előállĂtása Ă©s jellemzĂ©se = Synthesis and characterization of electronically conducting polymers with new properties
A kutatás tĂ©mája olyan konjugált polimereken alapulĂł összetett anyagok előállĂtása, jellemzĂ©se Ă©s alkalmazási lehetĹ‘sĂ©geik feltárása volt, melyek mágneses, termoelektromos vagy fotokatalitikus sajátságokat mutatnak. MegvalĂłsĂtottuk magnetit nanorĂ©szecskĂ©k szerves közegbe törtĂ©nĹ‘ átvitelĂ©t, Ă©s igazoltuk a magnetit nanorĂ©szecskĂ©k felĂĽletĂ©n elhelyezkedĹ‘ hidroxil- Ă©s a karbonsavval szubsztituált tiofĂ©nek karboxil-csoportja közötti kölcsönhatás kĂ©miai jellegĂ©t. A magnetit nanorĂ©szecskĂ©k felĂĽletĂ©n megvalĂłsĂtott adszorpciĂłja Ăştján eredmĂ©nyesen Ă©pĂtettĂĽnk be polipirrol elektrĂłdba B12 vitamint. MegvalĂłsĂtottuk titán-dioxid Ă©s szĂ©n nanocsĹ‘ kötegeknek vezetĹ‘ polimerekkel törtĂ©nĹ‘ kombinálását. KiemelkedĹ‘ termoelektromos sajátsággal rendelkezĹ‘ 3-alkiltiofĂ©nek polimerjeit átkristályosĂtva – nemesfĂ©mek beĂ©pĂtĂ©se rĂ©vĂ©n – nanoszálas kompozitokat alakĂtottunk ki. A mintákat átfogĂłan jellemeztĂĽk az anyagtudomány terĂĽletĂ©n általánosan használt technikák (röntgen-diffrakciĂł, spektroszkĂłpiák, elektronmikroszkĂłp, elektrokĂ©miai nanogravimetria, vezetĂ©smĂ©rĂ©s) alkalmazásával. Az irodalomban elsĹ‘kĂ©nt kidolgoztuk az in situ spektroelektrokĂ©miai Ă©s impedanciamĂ©rĂ©s szimultán alkalmazhatĂłságát, kimutattuk Ă©s Ă©rtelmeztĂĽk a vezetĂ©s kialakulásának az egyes töltĂ©shordozĂłkkal valĂł – változĂł – korreláciĂłját. FelhĂvtuk a figyelmet az elektronegatĂv anionok jelenlĂ©tĂ©ben törtĂ©nĹ‘ elektrokĂ©miai polimerizáciĂł veszĂ©lyĂ©re, Ă©s körĂĽltekintĹ‘ alkalmazásának szĂĽksĂ©gessĂ©gĂ©re. | During the project, conducting polymer based composites – exhibiting magnetic, thermoelectric or photocatalytic properties - have been synthesized. We realised the transfer of magnetic nanoparticles into organic media, and proved the chemical pattern of the interaction between the hydroxyl group on the surface of the magnetic nanoparticles and the carboxyl group of the acid substituted thiophenes. Exploiting the adsorption of vitamin B12 on the magnetite nanoparticles, its successful incorporation into polypyrrole has been achieved. Composites of conducting polymers with nanotube arrays of titanium dioxide and carbon have been also synthesized. Via re-crystallisation of poly(3-alkylthiophenes) – possessing extraordinary good thermoelectric property – nanofils of composites with noble metals have been prepared. The composites have been characterized widely with XRD, SEM – EDX, EQCM, ac conductance, as well as by diffuse reflection mode, UV-VIS absorption and FTIR – ATR mode spectroscopy. For the first time in the literature, we elaborated the application of in situ spectroelectrochemistry and in situ conductance in a hyphenated mode, and elucidated the background of differences in the correlation between the development of the conductance and the optically distinguishable charge carriers. We called the attention to the potential dangers arising during the electro-polymerisation in the presence of electronegative anions, and to the necessity of its careful consideration
Inhomogenity of the 172 nm VUV light irradiated aqueous solutions
Vacuum ultraviolet (VUV) photolysis is one of the Advanced Oxidation Processes (AOPs) for the elimination of trace pollutants from water and air. The ultraviolet (UV) radiation below 200 nm is named VUV, because it is strongly absorbed by air. Using VUV photolysis reactive species (H and OH) can be generated directly from water without addition of any chemicals. Consequently VUV radiation is used for producing ultrapure water and often investigated as a possible method for elimination of organic pollutants from water. In the case of VUV photolysis low pressure mercury vapor lamp (emits both 254 nm UV and 185 nm VUV photons) or Xe excimer lamp (emits both 172 nm VUV photons) can be applied as light source. In latter case the absorption coefficient of water at 172 nm is 550 cm–1 . Consequently, the penetration depth of VUV radiation is very small, only 0.04 mm. In this work we have investigated the effect of inhomogenity caused within this very thin VUV irradiated layer on the concentration of the primary formed reactive species, such as H and OH, using model calculation
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