Number of found documents: 4
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Controlled structuring of self–assembled polystyrene microsphere arrays by two different plasma systems
Domonkos, Mária; Ižák, Tibor; Štolcová, L.; Proška, J.; Kromka, Alexander
2013 - English
In this study we present a successful manipulation of microspheres by reactive ion etching (RIE). A self-assembled monolayer close-packed array of monodisperse polystyrene microspheres (PM) with diameter of 471 nm was used as the primary template. The PM templates were processed in two different RIE systems: (i) capacitively coupled radiofrequency plasma (CCP) and (ii) dual plasma system which combines CCP and pulsed linear-antenna microwave plasma (PLAMWP). The influence of process conditions on the PM geometry was systematically studied by scanning electron microscopy (SEM). The process conditions were controlled by varying radiofrequency (RF) power, gas mixture (O2:CF4 ratio) and process duration. Keywords: nanosphere lithography; reactive ion etching; pulsed linear-antenna microwave plasma; polystyrene microspheres; Langmuir-Blodgett monolayers Fulltext is available at external website.
Controlled structuring of self–assembled polystyrene microsphere arrays by two different plasma systems

In this study we present a successful manipulation of microspheres by reactive ion etching (RIE). A self-assembled monolayer close-packed array of monodisperse polystyrene microspheres (PM) with ...

Domonkos, Mária; Ižák, Tibor; Štolcová, L.; Proška, J.; Kromka, Alexander
Fyzikální ústav, 2013

Volumic dependence of nucleation barrier at critical supersaturation
Kožíšek, Zdeněk; Demo, Pavel; Sveshnikov, Alexey
2010 - English
Kinetic equations of nucleation are solved numerically to found conditions, under which first nuclei are formed. Critical supercooling is determined from the size distribution of nuclei. It is shown that nucleation barrier at critical supercooling depends logarithmically on droplet volume. Keywords: nucleation; critical supersaturation; nucleation barrier; objem; rozdělení T Fulltext is available at external website.
Volumic dependence of nucleation barrier at critical supersaturation

Kinetic equations of nucleation are solved numerically to found conditions, under which first nuclei are formed. Critical supercooling is determined from the size distribution of nuclei. It is shown ...

Kožíšek, Zdeněk; Demo, Pavel; Sveshnikov, Alexey
Fyzikální ústav, 2010

Equilibrium shape of a liquid nucleus on a highly curved surface of a nanofiber
Sveshnikov, Alexey; Demo, Pavel; Kožíšek, Zdeněk
2010 - English
Approximate equilibrium shape of a liquid nucleus on a nanofiber was determined by minimalization of its free energy under condition of the constant volume of the nucleus. The nucleus is stretched in the direction parallel to the nanofiber axis. The deviation of the shape from a sphere is larger for well-wetting cases. Keywords: nucleus shape; highly curved surface; nanofibers; povrch; energie Fulltext is available at external website.
Equilibrium shape of a liquid nucleus on a highly curved surface of a nanofiber

Approximate equilibrium shape of a liquid nucleus on a nanofiber was determined by minimalization of its free energy under condition of the constant volume of the nucleus. The nucleus is stretched in ...

Sveshnikov, Alexey; Demo, Pavel; Kožíšek, Zdeněk
Fyzikální ústav, 2010

Testování oduhličené vrstvy oceli metodou Barkhausenova šumu
Stupakov, Oleksandr; Tomáš, Ivan; Skrbek, L.
2010 - Czech
Průmyslově nežádoucí proces oduhličení povrchové vrstvy běžné pružinové oceli ČSN 414260 (EN 54SiCr6) byl simulován žíháním na vzduchu při teplotě 800oC s různým časem výdrže v peci. Byly připraveny tři série vzorků s různě ošetřeným povrchem: (i) bez povrchové úpravy (s okujemi oxidů železa), (ii) s mořením v kyselině chlorovodíkové a (iii) s povrchem otryskaným pískem. Získané povrchové oduhličené vrstvy s tloušťkou v rozmezí 0,1-0,35 mm byly zkoumány optickým mikroskopem, vlnovým disperzním spektrometrem a metodou povrchové rentgenové difrakce. Magnetic Barkhausen noise technique was tested for applicability of non-destructive charaterization of the decarburized layer depth. A newly introduced parameter, Barkhausen noise coercivity, was proposed for practical use due to its sensitivity to the tested decarburization and its stability to the measurement conditions. Keywords: magnetic Barkhausen noise; surface magnetic field; surface decarburization; carbon steel; magnetic non-destructive testing; povrchové úpravy materiálů; povrch Fulltext is available at external website.
Testování oduhličené vrstvy oceli metodou Barkhausenova šumu

Průmyslově nežádoucí proces oduhličení povrchové vrstvy běžné pružinové oceli ČSN 414260 (EN 54SiCr6) byl simulován žíháním na vzduchu při teplotě 800oC s různým časem výdrže v peci. Byly připraveny ...

Stupakov, Oleksandr; Tomáš, Ivan; Skrbek, L.
Fyzikální ústav, 2010

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