Počet nalezených dokumentů: 588
Publikováno od do

Adhesion improvement between bitumen and mineral aggregate:theoretical principles and their impact on pavement structure lifetime
Trejbal, J.; Demo, Pavel; Nežerka, V.; Sveshnikov, Alexey; Valentová, T.; Valentin, J.
2019 - anglický
Influence of nanomaterial-based adhesion promoters on maximizing of intermolecular interactions between bitumen and aggregate surfaces was studied. Topological and physico-chemical properties were described and it is shown that presence of promoters increases adhesion about 18%. Klíčová slova: adhesion promoters; interface interactions Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Adhesion improvement between bitumen and mineral aggregate:theoretical principles and their impact on pavement structure lifetime

Influence of nanomaterial-based adhesion promoters on maximizing of intermolecular interactions between bitumen and aggregate surfaces was studied. Topological and physico-chemical properties were ...

Trejbal, J.; Demo, Pavel; Nežerka, V.; Sveshnikov, Alexey; Valentová, T.; Valentin, J.
Fyzikální ústav, 2019

Realizace nového optického tenkovrstvého ochranného prvku
Hubička, Zdeněk; Čada, Martin; Olejníček, Jiří; Kšírová, Petra; Tvarog, Drahoslav; Houha, R.; Matulová, L.
2019 - český
Byl vyvinut nový ochranný optický prvek s polovodivou tenkou vrstvou, která měla definované elektrické a optické vlastnosti. A new optical protection element was developed with a semiconductor thin film with defined electrical and optical properties.\n Klíčová slova: optical thin film; sputtering; semiconductor; impedance Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Realizace nového optického tenkovrstvého ochranného prvku

Byl vyvinut nový ochranný optický prvek s polovodivou tenkou vrstvou, která měla definované elektrické a optické vlastnosti....

Hubička, Zdeněk; Čada, Martin; Olejníček, Jiří; Kšírová, Petra; Tvarog, Drahoslav; Houha, R.; Matulová, L.
Fyzikální ústav, 2019

Microscopic study of multifunctional drug molecule adhesion to electronic biosensors coated with diamond and gold nanoparticles
Finsterle, T.; Pilarčíková, I.; Bláhová, I.A.; Potocký, Štěpán; Kromka, Alexander; Ukraintsev, Egor; Nepovimová, E.; Musílek, K.; Kuča, K.; Rezek, B.
2019 - anglický
The easy and fast detection of drug content and concentration levels is demanded in biological research as well as in clinical practice. Here we study on microscopic level how nanodiamonds and gold nanoparticles interact with a multifunctional drug molecule directly on a biosensor surface. The sensors are made of interdigitated Au electrodes coated by 5 nm hydrogenated or oxidized nanodiamonds and further combined with Au colloidal nanoparticles (size 20 nm) providing nanoscale composite (spacing 100 nm). Atomic force microscopy is employed to measure local tip-surface adhesion forces and surface topography. AFM adhesion maps show that the drug binds to all types of nanoparticles and the adhesion is also significantly influenced by the substrates on which the nanoparticles are deposited. Role of local AFM tip interaction with nanostructured surface is also discussed.\n Klíčová slova: alzheimer drugs; biosensors; nanodiamonds; nanoparticles Dokument je dostupný na externích webových stránkách.
Microscopic study of multifunctional drug molecule adhesion to electronic biosensors coated with diamond and gold nanoparticles

The easy and fast detection of drug content and concentration levels is demanded in biological research as well as in clinical practice. Here we study on microscopic level how nanodiamonds and gold ...

Finsterle, T.; Pilarčíková, I.; Bláhová, I.A.; Potocký, Štěpán; Kromka, Alexander; Ukraintsev, Egor; Nepovimová, E.; Musílek, K.; Kuča, K.; Rezek, B.
Fyzikální ústav, 2019

Relation between optical and microscopic properties of hydrogenated silicon thin films with integrated germanium and tin nanoparticles
Stuchlík, Jiří; Stuchlíková, The-Ha; Čermák, Jan; Kupčík, Jaroslav; Fajgar, Radek; Remeš, Zdeněk
2019 - anglický
The hydrogenated amorphous silicon layers (a-Si:H) were deposited by PECVD method on quartz substrates. During interruption of PECVD process the vacuum chamber was pumped up to 10-5 Pa and 1 nm thin films of Germanium or Tin were evaporated on the surface. The materials form isolated nanoparticles (NPs) on the a-Si:H surface. Then the deposited NPs were covered and stabilized by a-Si:H layer by PECVD. Those two deposition processes were alternated 5 times. The a-Si:H thin films with integrated Ge or Sn NPs were characterized optically by PDS and CPM methods, and microscopically by SEM and AFM microscopies. Optical and microscopic properties of the structures are correlated and discussed considering their application in photovoltaics.\n Klíčová slova: thin films; a-Si:H; nanoparticles; germanium; tin Plné texty jsou dostupné v digitálním repozitáři Akademie Věd.
Relation between optical and microscopic properties of hydrogenated silicon thin films with integrated germanium and tin nanoparticles

The hydrogenated amorphous silicon layers (a-Si:H) were deposited by PECVD method on quartz substrates. During interruption of PECVD process the vacuum chamber was pumped up to 10-5 Pa and 1 nm thin ...

Stuchlík, Jiří; Stuchlíková, The-Ha; Čermák, Jan; Kupčík, Jaroslav; Fajgar, Radek; Remeš, Zdeněk
Fyzikální ústav, 2019

Inactivation of aspergillus niger on paints containing ZnO
Rácová, Z.; Baudys, M.; Krýsa, J.; Tichá, P.; Demo, Pavel
2019 - anglický
Antifungal capability of ZnO against bacteriae A. niger (including its photocatalytic activity) was analyzed. The optimal conditions for mould mycelium growth was estimated from evolution growth models. It was shown that prepared protective coating exhibits antifugal effect. Klíčová slova: self-cleaning; ZnO; photocatalysis; niger Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Inactivation of aspergillus niger on paints containing ZnO

Antifungal capability of ZnO against bacteriae A. niger (including its photocatalytic activity) was analyzed. The optimal conditions for mould mycelium growth was estimated from evolution growth ...

Rácová, Z.; Baudys, M.; Krýsa, J.; Tichá, P.; Demo, Pavel
Fyzikální ústav, 2019

Topological structures in ferroic materials: Book of Abstracts of the International Workshop TOPO2019
Hlinka, Jiří; Pokorný, Jan; Bubnov, Alexej
2019 - anglický
This is the Book of Abstracts for the International Workshop on Topological Structures in Ferroic Materials (TOPO2019 conference) held in Pruhonice-Prague on June 16-20, 2019. The special objective of the conference is expressed in the conference title: Topological Structures in Ferroic Materials. The continuous worldwide interest to this conference series is proving that it has a respected position within the series of International conferences covering all interdisciplinary field of the research. The fifth TOPO meeting in Prague 2019 was aiming to bring together the forefront science experts as well as young scientists interested in topological aspects of magnetic, superconducting, ferroelectric as well as liquid crystal matter, and mutually benefit from the beauty of the existing unifying scientific perspective. At the TOPO2019 conference more than 90 participants from 20 countries all over the world presented about 50 lectures.\n Klíčová slova: ferroic materials; topological structures Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Topological structures in ferroic materials: Book of Abstracts of the International Workshop TOPO2019

This is the Book of Abstracts for the International Workshop on Topological Structures in Ferroic Materials (TOPO2019 conference) held in Pruhonice-Prague on June 16-20, 2019. The special objective of ...

Hlinka, Jiří; Pokorný, Jan; Bubnov, Alexej
Fyzikální ústav, 2019

MOVPE GaN/AlGaN HEMT nano-structures
Hulicius, Eduard; Kuldová, Karla; Hospodková, Alice; Pangrác, Jiří; Dominec, Filip; Humlíček, J.; Pelant, Ivan; Cibulka, Ondřej; Herynková, Kateřina
2019 - anglický
GaN/AlGaN-based high electron mobility transistors (HEMTs) attain better performance than their state-of-the-art full silicon-based counterparts do, offering higher power, higher frequency as well as higher temperature of operation and stability, although their voltage and current limits are somewhat lower than for the SiC-based HEMTs. GaN/AlGaN-based HEMTs are a potential choice for electric-powered vehicles, for which they are approved not only for their power parameters, but also for their good temperature stability, lifetime and reliability. It is important to optimize HEMT structures and their growth parameters to reach the optimum function for the real-world applications. HEMT structures were grown by MOVPE technology in AIXTRON apparatus on (111)-oriented single-surface polished Si substrates. Structural, optical and transport properties of the structures were measured by X-ray diffraction, optical reflectivity, time-resolved photoluminescence and micro-Raman spectroscopy.\n Klíčová slova: GaN; MOVPE; HEMT Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
MOVPE GaN/AlGaN HEMT nano-structures

GaN/AlGaN-based high electron mobility transistors (HEMTs) attain better performance than their state-of-the-art full silicon-based counterparts do, offering higher power, higher frequency as well as ...

Hulicius, Eduard; Kuldová, Karla; Hospodková, Alice; Pangrác, Jiří; Dominec, Filip; Humlíček, J.; Pelant, Ivan; Cibulka, Ondřej; Herynková, Kateřina
Fyzikální ústav, 2019

New binary refractory metal-Fe intermetallic compounds for hard magnet applications
Tchaplianka, Maxim; Shick, Alexander
2019 - anglický
We investigate theoretically the electronic and magnetic structure of Fe2Hf. The density functional theory is used to calculate the magnetic moments on individual atoms, the total and projected densities of states, and the magnetic anisotropy energy. The Fe2Hf is found to be metallic and ferrimagnetic, with the magnetic moments of Fe and Hf atoms pointing in the opposite directions. The negative magnetic anisotropy, and the “in-plane” preferential direction of the magnetization are found as a result of theoretical calculations. Our study suggests that the chemical control of the magnetic anisotropy has to be investigated in order to evaluate the potential of Fe2Hf for the permanent magnet applications.\n Klíčová slova: electronic structure; magnetic anisotropy; permanent magnets Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
New binary refractory metal-Fe intermetallic compounds for hard magnet applications

We investigate theoretically the electronic and magnetic structure of Fe2Hf. The density functional theory is used to calculate the magnetic moments on individual atoms, the total and projected ...

Tchaplianka, Maxim; Shick, Alexander
Fyzikální ústav, 2019

Microstructure and mechanical properties of the potentially biodegradable ternary system Zn-Mg0. 8-Ca0.2
Pinc, Jan; Čapek, Jaroslav; Kubásek, J.; Veřtát, Petr; Hosová, K.
2019 - anglický
Zinc and zinc alloys exhibit suitable corrosion properties for biodegradable implants. Insufficient mechanical properties (for some applications) or low biocompatible Zn2+ concentrations can be modified by the alloying by essential elements like magnesium, calcium or strontium. The alloying elements also enhance the biocompatibility of zinc due to a decrease of Zn2+ release which could be toxic in a concentration exceeding 100 µM. In this study, the microstructure and hardness of a potentially biodegradable alloy ZnMg0.8Ca0.2 were observed in relation to different cooling rates. It was found that zinc dendrites, Mg2Zn11 (MgZn2) and CaZn13 phases occur in the material structure. The micro-hardness measurements revealed constant hardness of the particular phases, however, the macro-harness slightly decreased with the decreasing cooling rate due to changes in phase sizes and distribution. Klíčová slova: biodegradable materia; zinc; microstructure; hardness; ternary system Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Microstructure and mechanical properties of the potentially biodegradable ternary system Zn-Mg0. 8-Ca0.2

Zinc and zinc alloys exhibit suitable corrosion properties for biodegradable implants. Insufficient mechanical properties (for some applications) or low biocompatible Zn2+ concentrations can be ...

Pinc, Jan; Čapek, Jaroslav; Kubásek, J.; Veřtát, Petr; Hosová, K.
Fyzikální ústav, 2019

The photoluminescence and optical absorptance of plasma hydrogenated nanocrystalline ZnO thin films
Remeš, Zdeněk; Chang, Yu-Ying; Stuchlík, Jiří; Mičová, J.
2019 - anglický
We have developed the technology of the deposition of the nominally undoped ZnO nanocrystalline thin films by DC reactive magnetron sputtering of Zn target in the gas mixture of argon and oxygen plasma. We have optimized the photoluminescence spectroscopy for measuring optically scattering thin layers with the high sensitivity, precise sample positioning and very low influence of the scattered excitation light. Here we present the latest results on the enhancement of the photoluminescence of the nanocrystalline ZnO thin films after plasma hydrogenation. The photoluminescence in near UV region has been enhanced whereas the deep defect related photoluminescence has been significantly decreased. We found good room temperature stability of the plasma hydrogenated ZnO nanocrystals in air, but fast degradation at elevated temperature\n Klíčová slova: nanomaterials; ZNO; photoluminescence; magnetron sputtering Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
The photoluminescence and optical absorptance of plasma hydrogenated nanocrystalline ZnO thin films

We have developed the technology of the deposition of the nominally undoped ZnO nanocrystalline thin films by DC reactive magnetron sputtering of Zn target in the gas mixture of argon and oxygen ...

Remeš, Zdeněk; Chang, Yu-Ying; Stuchlík, Jiří; Mičová, J.
Fyzikální ústav, 2019

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