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Plasma-synthesised zinc oxide nanoparticle behavior in liquids
Rutherford, D.; Jíra, J.; Kolářová, Kateřina; Matolínová, I.; Remeš, Zdeněk; Kuliček, J.; Padmanaban, D.; Maguire, P.; Mariotti, D.; Rezek, B.
2022 - English
ZnO nanoparticles have been synthesized using non-thermal atmospheric pressure plasma (ZnO-NTP). We investigated the behavior of these ligand-free as a colloid suspension using different solvents, from deionized water to physiological saline and microbial culture broth. We found that the zeta potential of ZnONTP became more negative after exposure to microbial culture broth relative to water, which suggests increased colloid stability. Photoluminescence spectra of ZnO-NTP were similar regardless of liquid type, yet optical and fluorescent images of samples showed different agglomeration behaviour depending on liquid type. Scanning electron microscopy images revealed large agglomerates of ZnO-NTP interacting with the surface of bacteria cells, ranging in size from 200 nm up to 2 µm. We also studied effect of sub-lethal concentrations of ZnO-NTP on bacteria under illumination. There was no significant difference in viable bacteria concentration after 24h exposure to 10 µg/mL ZnO-NTP.
Keywords:
zinc oxide; nanotechnology; colloid suspension; bacteria
Available at various institutes of the ASCR
Plasma-synthesised zinc oxide nanoparticle behavior in liquids
ZnO nanoparticles have been synthesized using non-thermal atmospheric pressure plasma (ZnO-NTP). We investigated the behavior of these ligand-free as a colloid suspension using different solvents, ...
XXIV Czech-Polish seminar: Structural and ferroelectric phase transitions: Book of abstracts and program
Pokorný, Jan; Bubnov, Alexej; Janovská, Marie
2022 - English
This is the Book of Abstracts for the XXIV Czech-Polish Seminar (CPSEM-2022 conference) held in Harrachov (Czech Republic) on May 23 - 27, 2022. The special objective of the conference is expressed in the conference subtitle: Structural and Ferroelectric Phase Transitions. The continuous worldwide interest to this conference series is proving that it has a respected position within the series of International/European conferences covering all interdisciplinary field of the research related to structural and ferroelectric phase transitions. At the CPSEM-2022 conference there were about 100 participants from 10 countries delivered 8 tutorial lectures for early stage researchers, 8 invited lectures and selected 34 oral contributions. More than 55 posters were presented during two poster sessions.
Keywords:
Czech-Polish seminar; structural and ferroelectric phase transition
Available at various institutes of the ASCR
XXIV Czech-Polish seminar: Structural and ferroelectric phase transitions: Book of abstracts and program
This is the Book of Abstracts for the XXIV Czech-Polish Seminar (CPSEM-2022 conference) held in Harrachov (Czech Republic) on May 23 - 27, 2022. The special objective of the conference is expressed in ...
Termická analýza vstupních surovin pro růst krystalů vysokoteplotních komplexních oxidů
Zemenová, Petra; Král, Robert; Falvey, Alexandra; Pejchal, Jan; Bystřický, Aleš
2022 - Czech
Příspěvek se zabývá studiem tepelného chování oxidů vzácných zemin (La2O3, Sc2O3 a Gd2O3), které se používají jako výchozí suroviny při přípravě krystalů komplexních oxidů na bázi granátů a perovskitů, pomocí metod DSC-TG-MS. This contribution deals with the study of thermal behavior of oxide La2O3, Sc2O3 a Gd2O3 by methods DSC-TG-MS.
Keywords:
thermal analysis DSC-TG; mass spectrometry; oxide; high-temperature complex oxides crystals
Available at various institutes of the ASCR
Termická analýza vstupních surovin pro růst krystalů vysokoteplotních komplexních oxidů
Příspěvek se zabývá studiem tepelného chování oxidů vzácných zemin (La2O3, Sc2O3 a Gd2O3), které se používají jako výchozí suroviny při přípravě krystalů komplexních oxidů na bázi granátů a ...
CERTIFIKOVANÁ METODIKA, Metodika pro maloobjemovou sterilizaci násadových vajec
Bezděk, D.; Dejneka, Alexandr; Kubinová, Šárka; Fejt, T.; Churpita, Olexandr; Drahošová, Michala
2022 - Czech
Metodika je výsledkem řešení výzkumného projektu č. TH04030206 s názvem: Výzkum využití fyzikálních metod sterilizace vajec pro líhnění. Cílem projektu je rozvoj fyzikálních metod sterilizace násadových vajec - zejm. rozvoj metody nízkoteplotního plazmatu (NTP). Metoda NTP je nasazena se záměrem zvýšit efektivitu drůbežího chovu a výrazně snížit zdravotní a ekologickou zátěž. Zvýšením přidané hodnoty a efektivity chovu dále projekt přispívá ke konkurenceschopnosti drůbežářského průmyslu a tím i k potravinové soběstačnosti ČR. The methodology is the result of the solution of the research project No. TH04030206 entitled: Develoment of methods of physical sterilization of hatching eggs. The project is focused on a hatching egg sterilization based on physical methods - namely low temperature plasma (LTP). Compared to the existing methods, LTP should result in an increased efficiency of poultry farming and eliminated health and ecological risks. The higher added value and efficiency further contribute to higher competitiveness of the poultry industry and food self-sufficiency of the Czech Republic.
Keywords:
physical methods; sterilization of eggs for hatching; low-temperature plasma
Available at various institutes of the ASCR
CERTIFIKOVANÁ METODIKA, Metodika pro maloobjemovou sterilizaci násadových vajec
Metodika je výsledkem řešení výzkumného projektu č. TH04030206 s názvem: Výzkum využití fyzikálních metod sterilizace vajec pro líhnění. Cílem projektu je rozvoj fyzikálních metod sterilizace ...
Emergence of dark ZnO nanorods by hydrogen plasma treatment
Remeš, Zdeněk; Buryi, Maksym; Sharma, Dhananjay K.; Artemenko, Anna; Mičová, J.; Rezek, B.; Poruba, A.; Hsu, H.S.; Potocký, Štěpán; Babin, Vladimir
2022 - English
We employed a custom-built inductively coupled plasma (ICP) 13.56 MHz reactor with up to 300 W RF discharge power. Hydrothermally grown ZnO nanorods were exposed to the ICP plasma with a mixture of hydrogen and argon for up to 30 min, followed in-situ by plasma oxidation. Plasma properties were monitored by optical emission spectroscopy (OES) and by measuring the self-bias potential of the stainless steel sample holder separated from the ground by a blocking capacitor. The exciton-related UV photoluminescence of ZnO nanorods and optical absorption increases significantly after the plasma treatment. We attribute it to the complex changes of ZnO surface electronic states that also give rise to its black color visually.
Keywords:
ZnO; ICP; photoluminescence
Fulltext is available at external website.
Emergence of dark ZnO nanorods by hydrogen plasma treatment
We employed a custom-built inductively coupled plasma (ICP) 13.56 MHz reactor with up to 300 W RF discharge power. Hydrothermally grown ZnO nanorods were exposed to the ICP plasma with a mixture of ...
Vliv velikosti zrn práškového NaCl na jeho termické vlastnosti
Falvey, Alexandra; Zemenová, Petra; Vaněček, Vojtěch; Bystřický, Aleš; Stehlík, Štěpán; Král, Robert
2022 - Czech
Příspěvek se zabývá studiem tepelného chování vzorku NaCl v práškové formě (s homogenní a nehomogenní distribucí zrn, různou vlhkostí) a monokrystalického NaCl metodami termické analýzy (DSC a TMA) a hmotnostní spektrometrii (MS). The paper deals with the study of the thermal behavior of a sample of NaCl in powder form (with homogeneous and inhomogeneous grain distribution, different humidity) and monocrystalline NaCl using the methods of thermal analysis (DSC and TMA) and mass spectrometry (MS).
Keywords:
thermal analysis
Available at various institutes of the ASCR
Vliv velikosti zrn práškového NaCl na jeho termické vlastnosti
Příspěvek se zabývá studiem tepelného chování vzorku NaCl v práškové formě (s homogenní a nehomogenní distribucí zrn, různou vlhkostí) a monokrystalického NaCl metodami termické analýzy (DSC a TMA) a ...
Magnetocrystalline anisotropy of Ni-Mn-Ga-Co-Cu martensite
Rameš, Michal; Straka, Ladislav; Sozinov, A.; Heczko, Oleg
2022 - English
The martensites of Heusler alloys based on Ni-Mn-Ga exhibit magnetically-induced reorientation resulting in giant field-induced strain. Up to 12% strain was observed in Ni-Mn-Ga-Co-Cu with 4 at.% of Co and Cu. The driving force of the phenomenon is the magnetocrystalline anisotropy. We studied evolution of the anisotropy with temperature and compositions using magnetiyation curve measurements in four different single crystalline Ni-Mn-Ga-Co-Cu and compared with non-doped Ni-Mn-Ga. The anisotropy of martensite decreases with increasing average doping (Co+Cu)/2 but it does not scale with tetragonal ratio or valence electron concentration.
Keywords:
martensite; magnetocrystalline anisotropy; Heusler alloys; Ni-Mn-Ga
Available at various institutes of the ASCR
Magnetocrystalline anisotropy of Ni-Mn-Ga-Co-Cu martensite
The martensites of Heusler alloys based on Ni-Mn-Ga exhibit magnetically-induced reorientation resulting in giant field-induced strain. Up to 12% strain was observed in Ni-Mn-Ga-Co-Cu with 4 at.% of ...
Tenké vrstvy pro fotovoltaiku nanášené plasmochemickými metodami
Fejfar, Antonín
2022 - Czech
Tenké vrstvy jsou klíčovou komponentou prakticky všech moderních fotovoltaických článků pro využití sluneční energie. Články využívají tenké vrstvy pro dosažení optimálního záchytu světla, pro rozdělení a sběr fotogenerovaných nábojů i pro pasivaci rozhraní či přímo jako vrstvy absorbující fotony slunečního svitu. Každoročně jsou tak nanášeny vrstvy o celkové ploše řádu mnoha stovek kilometrů čtverečních, a to především s využitím plazmochemických technologií. Thin films are key components for practically all of contemporary photovoltaic cells for solar energy utilization. Cells use thin films for optimizing light trapping, for selecting and collection of photogenerated charges and interface passivation or as absorber layers. Each year several hundreds of square kilometers of thin films are deposited mainly by plasma chemistry methods.
Keywords:
thin films; deposition; plasma chemistry; photovoltaics
Available at various institutes of the ASCR
Tenké vrstvy pro fotovoltaiku nanášené plasmochemickými metodami
Tenké vrstvy jsou klíčovou komponentou prakticky všech moderních fotovoltaických článků pro využití sluneční energie. Články využívají tenké vrstvy pro dosažení optimálního záchytu světla, pro ...
Development and measurement of gas sensors for room temperature applications
Kočí, Michal
2022 - English
Gas sensing properties of a nanocrystalline diamond with a hydrogen-terminated surface (H-terminated NCD) and a molybdenum disulphide (MoS2) are investigated as conductivity sensors with built-in interdigital metal electrode structures. The H-terminated NCD was prepared by plasma-enhanced chemical vapour deposition (PECVD), and the MoS2 by a carbide-free one-zone sulfurization method. The sensor's responses were measured for oxidizing (NO2) and reducing (NH3) gases by the same equipment and setup. The parameters of the tested sensors are compared and critically evaluated. Advantageously, the MoS2/H-terminated NCD heterostructure enhances the gas sensing response at room temperature compared to the H-terminated NCD and MoS2 layers.
Keywords:
gas sensor; nanocrystalline diamond (NCD); transition metal dichalcogenide (TMD)
Fulltext is available at external website.
Development and measurement of gas sensors for room temperature applications
Gas sensing properties of a nanocrystalline diamond with a hydrogen-terminated surface (H-terminated NCD) and a molybdenum disulphide (MoS2) are investigated as conductivity sensors with built-in ...
Transformation of ZnO-based structures under heavy Mo doping: Defect states and luminescence
Buryi, Maksym; Remeš, Zdeněk; Děcká, Kateřina; Mičová, J.; Landová, Lucie
2022 - English
Hydrothermally grown ZnO-based structures were heavily doped with Mo (various doping levels from 2 to 25%). It has been found that Mo strongly affects the ZnO structure and morphology rather resulting in the complex, mixed zinc and molybdenum oxides creation. Moreover, the material phases transformation upon the increased Mo content was observed. ZnO material phase was observed only at low Mo doping level (2 and 5%). This correlated very well to the changes in the luminescence and electron paramagnetic resonance signals.
Keywords:
ZnO; Mo doping; material phase transformation; luminescence; electron paramagnetic resonance
Fulltext is available at external website.
Transformation of ZnO-based structures under heavy Mo doping: Defect states and luminescence
Hydrothermally grown ZnO-based structures were heavily doped with Mo (various doping levels from 2 to 25%). It has been found that Mo strongly affects the ZnO structure and morphology rather resulting ...
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