No (565)
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565
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Spatially separated HOMO/LUMO at interface of polypyrrole physisorbed on oxidized nanodiamond facets
Matunová, Petra; Jirásek, Vít; Rezek, Bohuslav
2017 - English
Nanodiamond particles (NDs) have recently risen in popularity owing to their unique and perspective properties. Merging NDs with organic molecules, such as polypyrrole (PPy), into hybrid organic-semiconductor functional systems gives rise to potential applications in photovoltaics (PV), which is supported by prior experimentally observed charge transfer between bulk diamond and PPy. This work focuses on the most relevant (111) and (100) O-terminated ND facets with different coverage of surface terminating oxygens in ether, epoxide, ketone, and peroxide positions. We use density functional theory (DFT) computations employing B3LYP functional and 6-31G(d) basis set. Energetically the most favorable oxidized ND facets were further optimized with PPy in physisorbed configurations. Analysis of geometry, binding energy, HOMO-LUMO gap, and charge transfer was done on the relaxed PPy-ND structures. Multiple hydrogen bonds are formed between PPy amino groups and O atoms on ND surface.
Keywords:
diamond; naoparticules; polypyrrole; density functional theory; charge transfer
Available at various institutes of the ASCR
Spatially separated HOMO/LUMO at interface of polypyrrole physisorbed on oxidized nanodiamond facets
Nanodiamond particles (NDs) have recently risen in popularity owing to their unique and perspective properties. Merging NDs with organic molecules, such as polypyrrole (PPy), into hybrid ...
Surface acoustic waves in the layered systems
Tarasenko, Alexander; Boháč, Petr; Jastrabík, Lubomír
2016 - English
The laser acoustic method was used for analysis of two layered systems: thin titanium and diamond like carbon films both deposited on silicon. The film and substrate parameters are determined by fitting the theoretical curve to the measured dispersion curve. The fit software seeks that set of the system parameters whose theoretical curve coincides the best with the experimental data. For the titanium film the best root-mean square deviation was 2.04 m/s with the relative error < O.I % and for the DLC system the corresponding value was 0.30 m/s (the relative error < O.O1 % ).
Keywords:
laser acoustic method; surface acoustic waves; layered systems; Ti films; diamond-like carbon films
Available at various institutes of the ASCR
Surface acoustic waves in the layered systems
The laser acoustic method was used for analysis of two layered systems: thin titanium and diamond like carbon films both deposited on silicon. The film and substrate parameters are determined by ...
Příprava vzorků
Kopeček, Jaromír
2016 - Czech
Základní shrnutí metalografických a materiálografických postupů a technik pro přípravu vzorků pro mikrosvazkovou analýzu v SEM a příbuzné techniky. The basic summyry of metallography and materialography as it is exploited for SEM samples´ preparation and connected techniques.
Keywords:
SEM; metallography
Available at various institutes of the ASCR
Příprava vzorků
Základní shrnutí metalografických a materiálografických postupů a technik pro přípravu vzorků pro mikrosvazkovou analýzu v SEM a příbuzné techniky....
Metodika použití nízkoteplotního plazmatu za účelem sterilizace ran
Dejneka, Alexandr; Kubinová, Šárka; Moravec, J.; Bezděk, D.
2016 - Czech
Cílem metodiky je řešení sterilizace kožního povrchu a ran ve veterinární medicíně pomocí aplikace nízkoteplotního plazmatu. Nízkoteplotní plazma (NTP) má nespecifické antimikrobiální účinky a lze jej bezpečně aplikovat na živé tkáně, aniž by došlo k jejich poškození. Metodika předkládá řešení sterilizace tkání a ran s potenciální bakteriální, plísňovou či kvasinkovou kontaminací. Metodu lze použít také k antimikrobiální dekontaminaci a podpoře hojení chronických a nehojících se ran. The main aim of the methodology is sterilization of skin surface and wounds in veterinary medicine based on low-temperature plasma. Low-temperature plasma has a non-specific antimicrobial effect and therefore can be safely applied to the living tissue without causing any damage. The methodology describes a solution for sterilization of tissues and wounds with bacterial, fungal or yeast contamination. The method can also be used for antimicrobial decontamination as well as for healing of chronic and non-healing wounds. Methodology presents solutions sterilization of tissues and wounds with potential bacterial, fungal or yeast contamination. The method can also be used for antimicrobial decontamination and promote healing of chronic and non-healing wounds.
Keywords:
low-temperature plasma; sterilize; the wound; skin surface
Available at various institutes of the ASCR
Metodika použití nízkoteplotního plazmatu za účelem sterilizace ran
Cílem metodiky je řešení sterilizace kožního povrchu a ran ve veterinární medicíně pomocí aplikace nízkoteplotního plazmatu. Nízkoteplotní plazma (NTP) má nespecifické antimikrobiální účinky a lze jej ...
Difrakce zpět rozptýlených elektronů
Kopeček, Jaromír
2016 - Czech
Nástin metody EBSD dokumentující použitelnost metody, typické úkoly a aplikace. Outline of the EBSD method, its use, tasks and typical applications.
Keywords:
EBSD method; SEM; microstructure
Available at various institutes of the ASCR
Difrakce zpět rozptýlených elektronů
Nástin metody EBSD dokumentující použitelnost metody, typické úkoly a aplikace.
Outline of the EBSD method, its use, tasks and typical applications.
Příprava vzorků pro kalibraci zvětšení elektronových mikroskopů / 2016
Olejník, Kamil
2016 - Czech
Zabývali jsme se litografickou přípravou vzorků používaných pro kalibraci zvětšení elektronových mikroskopů.We have been working on lithographical preparation of specimens used for magnification calibration of electron microscopes. We have been working on lithographical preparation of specimens used for magnification calibration of electron microscopes.\n
Keywords:
electron microscope calibration; electron-beam lithography
Available at various institutes of the ASCR
Příprava vzorků pro kalibraci zvětšení elektronových mikroskopů / 2016
Zabývali jsme se litografickou přípravou vzorků používaných pro kalibraci zvětšení elektronových mikroskopů.We have been working on lithographical preparation of specimens used for magnification ...
Laser-driven ablation through fast electrons in PALS experiment
Gus'kov, S. Yu.; Chodukowski, T.; Demchenko, N.; Kalinowska, Z.; Kasperczuk, A.; Krouský, Eduard; Pfeifer, Miroslav; Pisarczyk, P.; Pisarczyk, T.; Renner, Oldřich; Skála, Jiří; Šmíd, Michal; Ullschmied, Jiří
2016 - English
Energy transfer to shock wave in Al and Cu targets irradiated by a laser pulse with intensity of I~1-50 PW/cm2 and duration of 250 ps was investigated at Prague Asterix Laser System (PALS). The iodine laser provided energy in the range of 100-600 J at the first and third harmonic frequencies. The focal spot radius of laser beam on the target was varied from 160 to 40 µm. The dominant contribution of fast electron energy transfer into the ablation process was found when using the first harmonic radiation, the focal spot radius of 40-100 µm, and the energy of 300-600 J. The fast electron heating results in the growth of ablation pressure from 60 Mbar at the intensity of 10 PW/cm2 to 180 Mbar at the intensity of 50 PW/cm2 and in the growth of the efficiency of the energy conversion into the shock wave from 2 to 7 % under the conditions of 2D ablation.
Keywords:
laser-produced plasma; ablation pressure
Available at various institutes of the ASCR
Laser-driven ablation through fast electrons in PALS experiment
Energy transfer to shock wave in Al and Cu targets irradiated by a laser pulse with intensity of I~1-50 PW/cm2 and duration of 250 ps was investigated at Prague Asterix Laser System (PALS). The iodine ...
Aproximace Fourierových koeficientů difrakčních profilů
Čerňanský, Marian
2016 - Czech
Je podán stručný přehled aproximací, které se vyskytují ve Warrenově–Averbachově interpretaci Fourierových koeficientů difrakčních profilů. Je ukázáno, že jisté aproximace průběhu Fourierových koeficientů umožňují stanovit velikost krystalitů a mikrodeformací jen z jedné difrakční linie.\n\n Approximations in the Warren-Averbach interpretation of Fourier coeeficients of diffraction profiles are briefly summarized. It is shown, that certain approximations of a course of Fourier coefficients enable estimate of crystallite size and microstrain only from a single diffraction line.
Keywords:
line profile analysis; Fourier coefficients; crystallite size; microstrain
Available at various institutes of the ASCR
Aproximace Fourierových koeficientů difrakčních profilů
Je podán stručný přehled aproximací, které se vyskytují ve Warrenově–Averbachově interpretaci Fourierových koeficientů difrakčních profilů. Je ukázáno, že jisté aproximace průběhu Fourierových ...
Micro-Raman analysis of samples irradiated at the FLASH facility in Summer 2014 (Report v1-31_05_2016)
Toufarová, Martina; Hájková, Věra; Chalupský, Jaromír; Juha, Libor
2016 - English
The goal of micro-Raman measurements was to indicate a presence of the carbon black grown in the FEL-illuminated areas on the sample surface. Twelve samples have been investigated and results have been reported to the X-ray Optics Group at the University of Twente.
Keywords:
radiation damage; carbon black; free-electron laser; soft x-rays; Raman spectroscopy
Available at various institutes of the ASCR
Micro-Raman analysis of samples irradiated at the FLASH facility in Summer 2014 (Report v1-31_05_2016)
The goal of micro-Raman measurements was to indicate a presence of the carbon black grown in the FEL-illuminated areas on the sample surface. Twelve samples have been investigated and results have ...
Geometric resonances in reflectivity spectra of lead zirconate
Dočekalová, Zuzana; Hlinka, Jiří
2016 - English
The paper deals with effects of domain boundaries on the THz–frequency range dispersion of the complex dielectric permitivity tensor of lead zirconate. In the case of a sufficiently narrow domain widths (in comparison to the wave–length of the light used in the experiment), the effective–medium average permittivity shows additional peaks identified as geometric resonances, i.e. extraneous excitations created by thematerial interface. Features of the far–infrared reflectivity spectra of the twinned lead zirconate crystal in the limit of narrow and wide domains are estimated with the\nhelp of the damped harmonic oscillator model with paramaters fully determined fromrecent experiments.
Keywords:
geometric resonances; lead zirconate; antiferroelectrics; reflectivity; phonon
Available at various institutes of the ASCR
Geometric resonances in reflectivity spectra of lead zirconate
The paper deals with effects of domain boundaries on the THz–frequency range dispersion of the complex dielectric permitivity tensor of lead zirconate. In the case of a sufficiently narrow domain ...
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