Number of found documents: 483
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Microscopic characterization of graphene material and electronic quality across neighbouring, differently oriented copper grains
Čermák, Jan; Yamada, T.; Ganzerová, Kristína; Rezek, Bohuslav
2014 - English
We study graphene grown across the boundary of three such grains having bright, medium, and dark color in reflection. Raman micro-spectroscopy proves presence of mostly a monoor bi-layer graphene on all the grains. Yet intensity of Raman 2D band is grain-dependent: highest at the darkest grain and lowest at the brightest one. Contrary, conductive atomic force microscopy detects the highest conductivity at the brightest grain and the lowest current at the darkest grain. This is attributed to dominant electrical current path through graphene and underlying oxide thickness of which also depends on the type of copper grain. We correlate and discuss the results with view to better understanding of graphene growth and electronic properties on large area copper substrates. Keywords: graphene; chemical vapor deposition; atomic force microscopy; Raman spectroscopy; electronic properties Available at various institutes of the ASCR
Microscopic characterization of graphene material and electronic quality across neighbouring, differently oriented copper grains

We study graphene grown across the boundary of three such grains having bright, medium, and dark color in reflection. Raman micro-spectroscopy proves presence of mostly a monoor bi-layer graphene on ...

Čermák, Jan; Yamada, T.; Ganzerová, Kristína; Rezek, Bohuslav
Fyzikální ústav, 2014

Development of materials science in research and education. Book of abstracts of the 24th joint seminar
Kožíšek, Zdeněk; Nitsch, Karel
2014 - English
Topics: - Trends in development of materials research - Education of materials science at the universities - Information about the research programmes of individual institutions - Information on equipment for preparation and characterisation of materials - Results of materials science research Keywords: material sciences Available at various institutes of the ASCR
Development of materials science in research and education. Book of abstracts of the 24th joint seminar

Topics: - Trends in development of materials research - Education of materials science at the universities - Information about the research programmes of individual institutions - Information on ...

Kožíšek, Zdeněk; Nitsch, Karel
Fyzikální ústav, 2014

Safety aspects of usage of flammable and toxic gases in high power laser accelerator experiments
Procházka, Petr; Prokůpek, J.; Perales, B.
2014 - English
High power laser accelerators are promising technologies that can effectively decrease the space and potentially cost of the particle acceleration experiments. For many of them there is a technical demand to use flammable and toxic gases as targets for lasers or for accelerated particles. Their usage, however, brings many challenges for design of the technology and safety management system of the facility. Keywords: high power laser; accelerator Available at various institutes of the ASCR
Safety aspects of usage of flammable and toxic gases in high power laser accelerator experiments

High power laser accelerators are promising technologies that can effectively decrease the space and potentially cost of the particle acceleration experiments. For many of them there is a technical ...

Procházka, Petr; Prokůpek, J.; Perales, B.
Fyzikální ústav, 2014

Rychlé a citlivé stanovení metforminu v lidské moči a séru pomocí kapilární elektroforézy s bezkontaktní vodivostní detekcí
Tůma, P.; Fauknerová-Matějčková, J.; Jurka, Vlastimil; Samcová, E.
2014 - Czech
Tento příspěvek je zaměřen na vývoj velmi rychlého kapilárně elektroforetického (CE) stanovení metforminu v lidské moči a séru. Úprava moče i séra před CE analýzou je velmi jednoduchá a spočívá pouze v ředění tělní tekutiny popřípadě deproteinizaci vzorku. Capillary electrophoresis with contactless conductivity detection has been used for direct determination of the antidiabetic drug metformin in human urine and serum. Metformin is separated in 2 M acetic acid as background electrolyte. The monitoring of metformin levels in urine is performed on the shord separation path under high electric intensity. Keywords: capillary electrophoresis; contractless conductivity detection; large volume sample stacking; metformin Available at various institutes of the ASCR
Rychlé a citlivé stanovení metforminu v lidské moči a séru pomocí kapilární elektroforézy s bezkontaktní vodivostní detekcí

Tento příspěvek je zaměřen na vývoj velmi rychlého kapilárně elektroforetického (CE) stanovení metforminu v lidské moči a séru. Úprava moče i séra před CE analýzou je velmi jednoduchá a spočívá pouze ...

Tůma, P.; Fauknerová-Matějčková, J.; Jurka, Vlastimil; Samcová, E.
Fyzikální ústav, 2014

Influence of incorporated nanodiamond particles on mechanical properties of composite material based on multi-layer PVA nanofiber textiles
Prošek, Zdeněk; Indrová, K.; Rácová, Z.; Ryparová, Pavla; Nežerka, V.; Topič, J.; Tesárek, Pavel; Kromka, Alexander
2014 - English
The present study investigates the influence of NDP on mechanical properties of multi-layer PVA nanofiber textiles. The particles of a diameter equal to 5 nm were incorporated into double- and triple-layer textiles, while the single-layer samples were prepared as the reference. The diameter of PVA nanofibers varied from 100 to 300 nm. We characterized the tensile strength, stiffness and ductility of fabricated nanofibers by using a conventional method – a tensile test. We found that the NDP-enriched nanofibers reveal antibacterial character. However, none or negligible influence of NDP additions on the tested mechanical properties was observed. Keywords: nanofibers; PVA; nanodiamonds; electrospinning; mechanical properties; SEM Available at various institutes of the ASCR
Influence of incorporated nanodiamond particles on mechanical properties of composite material based on multi-layer PVA nanofiber textiles

The present study investigates the influence of NDP on mechanical properties of multi-layer PVA nanofiber textiles. The particles of a diameter equal to 5 nm were incorporated into double- and ...

Prošek, Zdeněk; Indrová, K.; Rácová, Z.; Ryparová, Pavla; Nežerka, V.; Topič, J.; Tesárek, Pavel; Kromka, Alexander
Fyzikální ústav, 2014

Fabrication of 3D diamond membranes for microfluidic systems
Varga, Marián; Babchenko, Oleg; Bauerová, Pavla; Hruška, Karel; Jurka, Vlastimil; Kromka, Alexander; Rezek, Bohuslav
2014 - English
Perfusion of cell medium, especially in microfluidic devices, can provide in-vivo-like conditions for cell cultures. The most recent demand on such systems is to include electronically active artificial cell support for in-situ monitoring. Diamond thin films exhibit advantageous combination of physical, mechanical, chemical, biocompatible and electronic properties for this purpose. In this work we explore two strategies for fabrication of self-standing three-dimensional nanocrystalline diamond membrane for implementation in microfluidic invivo like experiments: i) nucleation and chemical vapour deposition (CVD) growth of diamond on porous 3D carbon foam (with 80 pores per inch) and ii) selective diamond growth predefined by photolithographic processing using copper grid mask. The morphology and material quality of the fabricated membranes are characterized by scanning electron microscopy and Raman spectroscopy. Keywords: nanocrystalline diamond; membranes; microwave plasma; microfluidics; carbon foam Available at various institutes of the ASCR
Fabrication of 3D diamond membranes for microfluidic systems

Perfusion of cell medium, especially in microfluidic devices, can provide in-vivo-like conditions for cell cultures. The most recent demand on such systems is to include electronically active ...

Varga, Marián; Babchenko, Oleg; Bauerová, Pavla; Hruška, Karel; Jurka, Vlastimil; Kromka, Alexander; Rezek, Bohuslav
Fyzikální ústav, 2014

Obecná metodika modelování vysokoteplotních technologických procesů metodou konečných prvků
Jirásek, Vít; Potocký, Štěpán; Sveshnikov, Alexey
2014 - Czech
Byla vyvinuta obecná metodika modelování vysokoteplotních reaktorů vyráběných SVCS Process Innovation, s.r.o. metodou konečných prvků, resp. konečných objemů. Metodika zahrnuje principy práce se SW balíky pro multifyzikální CFD modelování se zřetelem na navzájem propojené procesy chemicky reagujícího proudění, transportu hmoty a tepla. Značná část je dále věnována vztahu model-experiment, verifikaci a validaci modelů a porovnání výpočtů s experimenty. A general methodology for modeling of high-temperature reactors produced by SVCS Process Innovation, Ltd., using the finite element, resp. finite volume method, was developed. The methodology covers basics principles of working with SW packages for CFD modeling with the emphasis on the strongly coupled processes of chemically reacting fluid flow, mass and heat transport. An important part is devoted to the model-experiment relationship, verification and validation of models and comparison with experiments. Keywords: CFD modelling; high temperature reactor; high temperature oxidation; phosphorus diffusion; boron diffusion; LPCVD; PECVD Available at various institutes of the ASCR
Obecná metodika modelování vysokoteplotních technologických procesů metodou konečných prvků

Byla vyvinuta obecná metodika modelování vysokoteplotních reaktorů vyráběných SVCS Process Innovation, s.r.o. metodou konečných prvků, resp. konečných objemů. Metodika zahrnuje principy práce se SW ...

Jirásek, Vít; Potocký, Štěpán; Sveshnikov, Alexey
Fyzikální ústav, 2014

(100) substrate processing optimization for fabrication of smooth boron doped epitaxial diamond layer by PE CVD
Mortet, Vincent; Fekete, Ladislav; Ashcheulov, Petr; Taylor, Andrew; Hubík, Pavel; Trémouilles, D.; Bedel-Pereira, E.
2014 - English
Boron doped diamond layers were grown in an SEKI AX5010 microwave plasma enhanced chemical vapour deposition system. Effect of surface preparation, i.e. polishing and O2/H2 plasma etching on epitaxial growth on type Ib (100) HPHT synthetic diamonds were investigated. Using optimized substrate preparation, smooth (RRMS ~ 1 nm) boron doped diamond layers with metallic conduction and free of un-epitaxial crystallites were grown with a relatively high growth rate of 3.7 μm/h. Diamond were characterized by optical microscopy, optical profilometry, atomic force microscopy and Hall effect. Keywords: doping; PE CVD; diamond; surface treatment; thin film Available at various institutes of the ASCR
(100) substrate processing optimization for fabrication of smooth boron doped epitaxial diamond layer by PE CVD

Boron doped diamond layers were grown in an SEKI AX5010 microwave plasma enhanced chemical vapour deposition system. Effect of surface preparation, i.e. polishing and O2/H2 plasma etching on epitaxial ...

Mortet, Vincent; Fekete, Ladislav; Ashcheulov, Petr; Taylor, Andrew; Hubík, Pavel; Trémouilles, D.; Bedel-Pereira, E.
Fyzikální ústav, 2014

Characterisation of InAs/GaAs quantum dots by high resolution transmission electron microscopy
Zíková, Markéta; Hospodková, Alice; Pangrác, Jiří; Hulicius, Eduard; Komninou, Ph.; Kioseoglou, J.
2014 - English
The InAs/GaAs quantum dots (QDs) covered by GaAsSb strain reducing layer (SRL) have suitable properties for various applications. The GaAsSb SRL covering InAs QDs is used to improve the structure growth and the final parameters like QD density, QD size or photoluminesence. To obtain high-quality structure with required properties, the structure growth and final structure have to be deeply studied. Since the QDs and SRL system is surrounded by GaAs, the high resolution transmission electron microscopy (HRTEM) measurement was used to reveal the real material arrangement in a prepared sample. In this work we will discuss the results of following HRTEM measurements: flatness and thickness of prepared layers, QD size, atomic arrangement and composition of GaAsSb layer. Keywords: quantum dot; InAs; GaAsSb; high resolution transmission electron microscopy Available at various institutes of the ASCR
Characterisation of InAs/GaAs quantum dots by high resolution transmission electron microscopy

The InAs/GaAs quantum dots (QDs) covered by GaAsSb strain reducing layer (SRL) have suitable properties for various applications. The GaAsSb SRL covering InAs QDs is used to improve the structure ...

Zíková, Markéta; Hospodková, Alice; Pangrác, Jiří; Hulicius, Eduard; Komninou, Ph.; Kioseoglou, J.
Fyzikální ústav, 2014

Computational study of cellular assembly on hydrophobic/hydrophilic micro-patterns
Ukraintsev, Egor; Brož, A.; Kalbáčová, M.H.; Kromka, Alexander; Rezek, Bohuslav
2014 - English
We develop simple onedimensional stochastic model of cell behavior on chemically patterned surfaces that is based on three key parameters: speed of cell movement (motility) across substrate, probability of cell adhesion to substrate, and probability of cell division on substrate when adhered on substrate. Amount of adhered cells on hydrophobic and hydrophilic regions is calculated as function of time (number of cycles up to 2000). The model is correlated with in-vitro data obtained within 48 h in real time. We show that this simple stochastic model with the three parameters (where cell motility is the most important one) can describe with high accuracy the experimental data and thereby explain the observed preferential cell assembly on hydrophilic/hydrophobic micro-patterns (up to 200 um width). Keywords: SAOS-2 cells; cell movement; adhesion; stochastic computer simulations Available at various institutes of the ASCR
Computational study of cellular assembly on hydrophobic/hydrophilic micro-patterns

We develop simple onedimensional stochastic model of cell behavior on chemically patterned surfaces that is based on three key parameters: speed of cell movement (motility) across substrate, ...

Ukraintsev, Egor; Brož, A.; Kalbáčová, M.H.; Kromka, Alexander; Rezek, Bohuslav
Fyzikální ústav, 2014

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