|
|
Close Help | ||||||||||||||
Development of crystal growth technologies using the technique of Czochralski, homogeneous crystals growth conditions for PbWO4 and for the tungstates of alcaline earths AWO4 (A = Ca, Sr, Ba); defects in crystals; growth of doped crystals, growth conditions for PbWO4 single crystals doped at a high level (several percents) by rare earth elements; growth of non-stoichiometric PbWO4 single crystals and study of their absorption and emission centers. Celý text >>
Preparation and study of powder materials and ceramics based on some hafnates and aluminates, pure or doped by rare earth elements (Ce, Pr, Eu, Tb) and by some other dopes (Pb, Bi). The starting powder materials are in case of the hafnates (SrHfO3, Lu4Hf3O12) prepared via reaction in the solid state at higher temperatures, the lutetium and yttrium garnets (Lu3Al5O12, Y3Al5O12) are precipitated from solutions. Celý text >>
Methods of synthesis of the liquid crystals having the rod like form molecules and equipped with alkoxypropionate or alkyllactate chiral ending. Study of influence of the lateral substitution by the groups CH3, OCH3, Cl, Br, or F on the occurrence area of the phase SmC*. Synthesis of the non-chiral liquid crystals composed of the bent-shaped (bent-core, banana shaped) molecules. The synthesis of the photosensitive liquid crystalline materials the molecules of which contain in their mesogenic core a double bond of the stilbene type or an azo group. Celý text >>
The synthesis method development of the chiral monomers with the liquid-crystalline features which have a terminal double bond, an acrylate group, or terminal hydroxy groups. In cooperation with other groups within the frame of the project COST preparation of grafted liquid crystalline polymers of siloxane, acrylate or urethane types. Celý text >>
Application of the high pressure liquid chromatography (HPLC) at the determination of impurities contents in liquid crystalline materials of all types beforehand the measurement of their physical characteristics. Chromatographic determination of the E-Z isomer ratio for the photosensitive liquid crystalline materials. Utilisation of preparative HPLC for reaching an extreme purity of liquid crystalline substances. Celý text >>
Separation and determination of fullerenes by the HPLC method using Cosmosil Buckyprep stationary phase for study of photochemical degradation of the C60 a C70 fullerenes. Determination of traces of C60 in natural geological materials. Celý text >>
The decomposition methods development and analysis of less common oxide type materials (e.g. PbWO4, KTaO3, LiNbO3), and determination of trace impurities and doping elements in those materials. Determination of impurities and of main components in metals and alloys. Analyses of lead chlorides and bromides and of their mixtures, and determination of metallic impurities and of oxygen in these materials. Celý text >>
Synthesis of a series of liquid crystalline photosensitive monomers, with azo-group used as a connecting link in central parts of the molecules, has been successfully proposed and experimentally optimized.
Celý text >>Strontium hafnate doped by lead, SrHfO3:Pb, was proposed and for various Pb concentration tested. In comparison with the single crystalline bismuth germanate, Bi4Ge3O12, used as scintillation standard, up to 2.4 times higher scintillation effectiveness has been reached. Owing to this high effectiveness and also due to its low own radioactivity, the material is suitable for measurement of low level radiation in science, in medicine and in industry. A patent application has been submitted.
Celý text >>Copyright © 2008, Fyzikální ústav AV ČR, v. v. i.
