National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Mobilization of neutral compounds by inorganic and small organic ions in capillary electrophoresis
Křížek, T. ; Martínková, E. ; Kubíčková, A. ; Hladílková, Jana ; Coufal, P. ; Heyda, J. ; Jungwirth, Pavel
The present study shows that neutral low-molecular-mass compounds that are presumed to possess zero electrophoretic mobility and are thus used as markers of electroosmotic flow in capillary electrophoresis can acquire electrophoretic mobility due to ion-specific interactions with constituents of background electrolyte. Therefore, these neutral markers, such as thiourea or dimethyl sulfoxide, can be separated in electric field and their migration order can vary depending on background electrolyte composition. This observation has some important implications for analytical and physico-chemical measurements using capillary electrophoresis because the choice of the marker-background electrolyte combination can influence the results of the measurement.
Graphene Field-Effect Transistor as a Probe of Doping by Adsorbed Oxygen Molecules
Blechta, Václav ; Mergl, Martin ; Drogowska, Karolina ; Kučera, Lukáš ; Valeš, Václav ; Červenka, Jiří ; Kalbáč, Martin
Graphene has high potential in chemical sensing, thus understanding adsorption and charge transfer between graphene and adsorbed molecules is essential. We show that graphene field-effect transistor exhibits a moderate sensoric response towards oxygen at temperature of 150 °C. Field-effect transistors serve as a tool to probe electronic properties of graphene. We demonstrate that adsorption of oxygen molecules onto graphene leads to an upshift of Dirac point and light changes in mobility of charge carriers.

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