Research projects of the Neutron Physics Laboratory
Basic research activities at the NPI Řež have been funded through the Institutional Research Plan No. AV0Z10480505 (2005-2010): Nuclear Physics and Related Fields in the Basic, Applied and Interdisciplinary Research. In addition, some research projects of the NPL have been funded by following grants.
Provider Grantová agentura České republiky GAČR, 107/11/1856 2011-2013 Proposer Jiří Vacík, CSc., ÚJF AV ČR, v.v.i. Title Metal-fullerene nanocomposites and their biological applications. Název Nanokompozity kov-fulleren a jejich biologické aplikace.
The main topic of the grant project is the study of thin films of hybrid composites based on carbon allotropes (especially C60) and transition (and noble) metals, their preparation, modification and characterization, and also the study of their biological properties (i.e., biotolerance, adhesion of bone-type cells, their growth, differentiation, etc.). The purpose is to develop novel hybrid materials with well-defined structures and interesting properties attractive for applications (e.g., for tissue engineering). For fabrication of the composites, suitable deposition techniques will be used; for characterization of the films an arsenal of analytical methods will be at our disposal. The preliminary experiments demonstrated an interesting aspect of the project – the possibility of preparing composite materials with regular structures at a (sub-) micron scale level either created due to spontaneous self-organization (induced by a certain deposition kinetics), or because of coordinated phase separation initiated by thermal annealing or irradiation with energy ion beams. The specific goal of this project is to shed more light on the onset, mechanisms and kinetics of the above-mentioned phenomena.Read more...
Provider European Space Agency AO/1-6052/09/NL/CBI 2010-2011 Proposer Ing. Stanislav Pospíšil, DrSc,. UTEF ČVUT Praha Co-proposer Jiří Vacík, CSc., ÚJF AV ČR, v.v.i. Title Neutron Facilities in the Czech Republic for Calibration and Testing of ESA-Compliant Neutron-Sensitive Devices
The subject and principal aim of this proposal is the study and evaluation of neutron source facilities in the Czech Republic within preparatory activities for ESA purposes/needs. A parallel smaller part is the design and realization of short-term modifications of instruments. Long-term and major modifications and instrument upgrades can subject of future work.Read more...
Provider International Atomic Energy Agency IAEA CRP F1-RC-1158.1 2009-2013 Proposer RNDr. Miroslav Vrána, CSc., ÚJF AV ČR, v.v.i. Title Development, Characterization and Testing of Materials of Relevance to Nuclear Energy Sector Using Neutron Beams
Participation with the task: Development and optimization of high-resolution neutron scattering instruments dedicated to characterization and testing of materials of relevance to nuclear energy sector and related experiments in SANS, residual strain/stress and texture studies.Read more...
Provider Akademie věd České republiky GAAV, IAA400320901 2009-2011 Proposer Tomáš Baše, PhD., ÚACH AV ČR, v.v.i. Co-proposer Jiří Vacík, CSc., ÚJF AV ČR, v.v.i. Title Gold and silver surfaces modified with functional derivatives of boron hydrides Název Zlaté a stríbrné povrchy modifikované funkcními deriváty hydridu bóru
Gold and silver polyhedral particles with narrow size distribution and average diameter ranging from micrometer to nanometer dimensions will be prepared and securely deposited on titanium containing substrates (Ti or its alloys). The particles assembled into a consistent film with controlled roughness and morphology will be modified with selected thiol derivatives of boron hydrides. These substrate surfaces will be additionally treated with cell adhesion-mediating peptide-based ligands for cell adhesion receptors in order to promote and control the adhesion, growth and differentiation of osteogenic and vascular cells in cultures on the developed layers. Gold or silver nanoparticles will be tested in combination with fullerenes C60, i.e. carbon allotrope which proved to be a good substrate for the adhesion and growth of bone and vascular cells in our earlier studies. Potential cytotoxicity of silver containing layers in correlation with their antimicrobial properties will be tested.Read more...
Provider Grantová agentura České republiky GAČR 107/11/0704 2011-2014 Proposer Ing. Martin Petrenec, Ph.D., ÚFM AV ČR, v.v.i. Co-proposer Ing. Přemysl Beran, Ph.D., ÚJF AV ČR, v.v.i. Title Optimization of structure and properties of advanced high-temperature cast materials alloyed with carbon by complex heat treatment Název Optimalizace struktury a vlastnosti moderních vysokoteplotních litých materiálů legovaných uhlíkem pomocí komplexního tepelného zpracování
The aim of the project is development of new advanced cast multiphase gamma based TiAl-8Nb-X alloys alloyed with the graded carbon content (0.2 to 1 at. %), produced so far only by powder metallurgy. Sufficient thermo-mechanical stability of these alloys will be guaranteed by the lamellar structure strengthened by favorable distributed precipitates obtained using an optimized complex heat treatment. The main pertinent applications of the alloys suggested are turbocharger rotor or gas turbine blade in automotive and power industry, respectively, in which a decisive degradation mechanism represents creep-fatigue interaction at higher temperatures. The structure of new-developed cast alloys and its thermo-mechanical stability will be studied both in virgin state after optimized heat treatment and after high temperature creep-fatigue tests. Neutron diffraction (in-situ and post-mortem studies), TEM (transmission electron microscopy) and other modern experimental techniques will be used for the structure analysis and the study of damage mechanisms.Read more...
Provider Grantová agentura České republiky GAČR 107/12/0800 2012-2015 Proposer RNDr. Petr Šittner, CSc., FZÚ AV ČR, v.v.i. Co-proposer prof. RNDr. Jaroslav Pokluda, CSc., Fakulta strojního inženýrství VUT Brno
Ing. Přemysl Beran, Ph.D., ÚJF AV ČR, v.v.i.
Title Fatigue of NiTiX High Temperature Shape Memory Alloy Actuators /FACT/ Název Únava aktuátorů z vysokoteplotních slitin s tvarovou pamětí NiTiX /FACT/
Currently there is renewal of interest in actuation functionality using high temperature shape memory alloys with transformation temperatures above 100°C (HTSMA) driven by strong demand for reliable and powerful actuators to be used in engines and gas turbines, where it is preferable to adopt single piece compact adaptive actuator over more complex multicomponent assemblies. The aim of this project is to clarify the reasons for poor dimensional and functional stability and fatigue failure of NiTiX actuators. The research will be performed by combination earlier developed and used methods (thermomechanical fatigue testing, in-situ X-ray and neutron diraction, TEM and micromechanics modeling) . The research will be coordinated with worldwide academic and industrial partners currently developing HTSMA actuators. Approaches to modify the microstructure of NiTiX alloys so so they act as well performing HTSMA actuators for 100°C-300°C temperature range will be proposed (adjustment of composition, degree of cold work, heat treatment, texture, grain size, precipitation strengthening).Read more...
Provider Grantová agentura České republiky GAČR 204/10/0654 2010-2012 Proposer RNDr. Jan Šaroun, CSc., ÚJF AV ČR, v.v.i. Title Monte Carlo simulations of complex neutron optics systems
The aim of the submitted proposal is to get financial support for development of Monte Carlo methods for simulations of complex neutron optical systems, including their experimental validation and application to the research of dispersive multiple reflections of neutrons in elastically bent crystals. The new methods will be implemened in existing and well established software package RESTRAX, which has been developed at the NPI Řež. The results of experimental research of multiple Bragg reflections supported by Monte Carlo simulations will be employed in the development of high-resolution monochromators and analyzers. The ultimate goal of the proposed research is twofold: (a) Creation of an easy to use, validated and efficient software for modeling and optimization of neutron spectrometers employing advanced neutron optics elements and for data analysis; (b) Development and tests of dispersive multiple reflection monochromators suitable for ultra-high resolution measurements.Read more...
Provider International Atomic Energy Agency IAEA CRP F1.20.21 2007-2011 Proposer RNDr. Pavol Mikula, DrSc., ÚJF AV ČR, v.v.i. Title Improved production and utilization of short pulsed, cold neutrons at low-medium energy spallation neutron sources
Participation on multilateral project with the task: Development and optimization of a curved wide wavelength band monochromator based on strongly cylindrically bent perfect Si-slabs in a sandwich for microfocusing small-angle neutron scattering (mfSANS) device.Read more...
Provider Akademie věd České republiky KAN400480701 2007-2011 Proposer Jiří Vacík, CSc., ÚJF AV ČR, v.v.i. Title Nanostructures based on carbon and polymers for application in bioelectronic and medicine. Název Nanostruktury na bázi uhlíku a polymeru pro využití v bioelektronice a v medicíně.
The main goal of the project is synthesis and characterization of promising nanostructured composites (mainly of carbon allotropes and synthetic polymers) exhibiting important biological and other (electrical, optical) properties that would be possible to utilize in the interaction with biological systems. The synthesized composite materials (based on fullerenes and metals, carbon and polymers, modified nanocrystalline diamonds, carborans, etched ion tracks and ion implantation or irradiation) will be inspected from the viewpoint of biocompatibility, adhesion and growth of cells and other bioapplications. Another goal of the project is demonstration of the active hybrid system based on combination of a cell (biomolecule) and microelectronic device with a modified nanocrystalline diamond as an interface.Read more...
Provider Akademie věd České republiky M10048090 2009-2011 Proposer RNDr. Pavol Mikula, DrSc., ÚJF AV ČR, v.v.i. Title Braggova difrakční optika pro difraktometrii termálních neutronů s vysokým a ultravysokým rozlišením
Program interní podpory projektů mezinárodní spolupráce AV ČR (spolupráce ÚJF AV ČR, v.v.i. a KAERI Daejeon)
In the last decades many papers have been published in which successful employment of curved perfect Si crystals as neutron monochromators or analyzers in particular diffraction experiments has been reported. It has been found that due to the spatial condensation of neutrons (because of asymmetric diffraction geometry or focusing in real space), one may obtain a high monochromatic-beam density comparable to that of the mosaic monochromators. Taking into account reflectivity and the resolution properties of curved crystals Popovici et. al. (Missouri University) demonstrated a feasibility of the optimized curved crystal three axis spectrometer having the properties generally better than those of spectrometers employing flat mosaic crystals. New interest in the reflectivity and focusing properties of curved perfect crystals has been evoked also by successful testing of the bent perfect crystals employed in double-monochromator systems, or for medium-resolution small-angle scattering diffractometers. Favourable properties of bent Si crystals for short wavelength monochromatization have been reported and very efficient original double and triple axis arrangements employing the bent perfect crystals have been proposed and then tested for residual stress measurements of polycrystalline materials. In the last decade the neutron diffraction group of NPI ASCR, v.v.i. has been concentrated on the development of new unconventional types of neutron monochromators permitting significantly to increase figure of merit of some dedicated neutron scattering instruments. In this way a cooperation with colleagues from HANARO Centre in KAERI has appeared very fruitful.Read more...
Page 1 of 2