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Chemie a technologie materiálů

Chemie a technologie materiálů

Doctoral programme, Faculty of Chemical Technology
CHYBI CHARAKTERISTIKA PROGRAMU

Cílem studia doktorského studijního programu Chemie a technologie materiálů je příprava špičkových odborníků s širokými znalostmi v oblasti kovových, anorganických nekovových a polymerních materiálů. Studenti budou mít teoretický i praktický přehled o souvislostech mezi přípravou, chemickým složením a užitnými vlastnostmi materiálů. Program má silný teoretický základ vycházející z chemie a fyziky materiálů, fyzikálněchemických a chemicko-inženýrských principů popisu materiálů a materiálových technologií. Při řešení svých disertačních prací se prakticky seznámí s řadou moderních metod pro přípravu, analýzu a charakterizaci různých typů materiálů včetně nanostrukturovaných materiálů a biomateriálů pro medicínu.

Careers

Absolventi studia budou experty v oblasti materiálů a materiálových technologií. Uplatní se především ve vědecké oblasti, ale i v řídící sféře ve státních i průmyslových organizacích zaměřených na materiály a materiálové technologie.

Programme Details

Language of instruction Czech
Standard length of study 4 years
Form of study Full time
Guarantor of study programme prof. Dr. Ing. Dalibor Vojtěch
Programme Code D102
Place of study Praha
Capacity 20 students
Number of available PhD theses 56

List of available PhD theses

2D nanomaterials for the detection of pollutants in the environment

Department: Department of Inorganic Chemistry, Faculty of Chemical Technology
Theses supervisor: doc. RNDr. Martin Pumera, Ph.D.

Annotation

Candidate will fabricate 2D materials for environmental remediation. He/she will develop efficient catalyst to remove nitroaromatic and pesticide pollutants in ground waters using electrochemical and photoelectrochemical methods. More on www.nanorobots.cz

3D printing for the preparation of 3D graphene electrodes for detecting the decontamination of pollutants in the environment

Department: Department of Inorganic Chemistry, Faculty of Chemical Technology
Theses supervisor: doc. RNDr. Martin Pumera, Ph.D.

Annotation

Candidate will fabricate 3D printed electrodes for environmental remediation. He/she will develop efficient catalyst to remove nitroaromatic and pesticide pollutants in ground waters. More onwww.nanorobots.cz

Advanced high-entropy alloys with modifiable properties

Department: Department of Metals and Corrosion Engineering, Faculty of Chemical Technology
Theses supervisor: Ing. Filip Průša, Ph.D.

Annotation

High entropy alloys belong to a relatively new group of materials which are characterized by the preferential formation of solid solutions instead of intermetallic compounds. These materials exhibit several excellent properties, foremostly high strengths while maintaining sufficient ductility, good corrosion resistance and others. By suitable processing of these alloys, it is possible to achieve further substantial improvement of these already very good properties. The work will be focused on the preparation of new advanced high-entropy alloys combining significantly higher strengths while maintaining sufficient plasticity.

Advanced materials for green hydrogen preparation

Department: Department of Solid State Engineering, Faculty of Chemical Technology

Advanced methods and applications of SERS

Department: Department of Solid State Engineering, Faculty of Chemical Technology
Theses supervisor: Mgr. Oleksiy Lyutakov, Ph.D.

Advanced structures and materials for surface enhanced Raman spectroscopy

Department: Department of Solid State Engineering, Faculty of Chemical Technology

Analysis of batch-to-glass conversion process

Department: Laboratory of Inorganic Materials, Faculty of Chemical Technology
Also available in programme: Chemistry and Technology of Materials
Theses supervisor: Ing. Richard Pokorný, Ph.D.

Annotation

The goal of this project targets the analysis of one of the critical batch-to-glass conversion processes – the evolution and collapse of the primary foam at the batch-melt interface. This porous foam layer, which behaves as a form of insulation layer, results from the products of various gas evolving reactions that are being trapped in the primary melt. This project will focus on understanding the foam morphology, the reactions that lead to primary foaming.

Analysis of damage causes of historical objects

Department: Department of Metals and Corrosion Engineering, Faculty of Chemical Technology

Annotation

The damage causes of historical objects are not always easy to identify. When the damage is caused by microscopic changes in the materials microstructure, it is necessary to use advance analytical techniques, e.g. transmission electron microscopy. In this work, the results obtained from historical materials will be compared with model samples.

Bioaccesibility of antimony in urban traffic-loaded areas

Department: Department of Solid State Chemistry, Faculty of Chemical Technology

Annotation

Antimony (Sb) has not been well known and widely cited toxic elements yet, but it can posed a serious environmental risk in future. Sb compounds are used in industrial sphere as fire-resistant agents, hence the increased Sb concentration represents a challenge for geochemical and material research. The aim of this work is to study the stability of Sb compounds incoming to the environment and their subsequent behaviour in the soil-groundwater-surface water system. Geochemical properties of antimony and arsenic will be compared in term of their environmental stability and bioaccesibility. Next part of the work will be focused on the monitoring of selected heavily contaminated locality.

Cellulose acetate base motion picture films

Department: Department of Chemical Technology of Monument Conservation, Faculty of Chemical Technology
Theses supervisor: Ing. Vítězslav Knotek, Ph.D.

Annotation

Cinematographic films based on a cellulose triacetate base form a considerable part of collections in film archives. Films made in the period from the 1950s to the 1980s include a soundtrack in the form of a magnetic strip. The cellulose triacetate base is prone to degradation manifesting shrinkage, twist, and embrittlement. These dimensional changes can lead to errors in playing a magnetic soundtrack and difficult digitization. This work will focus on the study of cellulose triacetate film degradation processes and their influence on the magnetic soundtrack. One of the goals will be to develop methods for temporarily suppressing the symptoms of the degradation of the base and to determine the effect on the soundtrack. Furthermore, the possible catalytic effect of the magnetic soundtrack on the degradation of the base will be investigated.

Ceramics with controlled properties in CaO-Al2O3-SiO2 system

Department: Department of Glass and Ceramics, Faculty of Chemical Technology

Annotation

Ceramic materials in the CaO-Al2O3-SiO2 system are used for many applications. Materials with controlled delay in the area of small length changes during firing are possible to prepare by suitable composition of raw materials and their subsequent heat treatment. The work will be focused on the prediction of mixtures behavior in the field of the area of small length changes and characterization of final products.

Clinkerless hydraulic ternary binder

Department: Department of Glass and Ceramics, Faculty of Chemical Technology
Theses supervisor: Ing. Martina Šídlová, Ph.D.

Annotation

The aim of the dissertation thesis is the preparation of a clinkerless hydraulic ternary binder with lower energy requirements and lower CO2 emissions in comparison to Portland cement, and which contains amorphous C-A-S-H as the binder phase. The development of the binder would be aimed at the lime activation of aluminosilicates, especially calcined clays. The work would also include a study of the reactivity of calcined clays from low quality and waste kaolinitic rocks. Another raw material of the binder would be waste gypsums. Hydration products would be study by a number of methods: XRD, SEM + ED, IR, or NMR Solid State, TGA and porosimetry. The work would include the determination of mechanical properties of the prepared ternary binder after the hydration period in a time horizon longer than 1 year. The work is part of an effort to increase the durability of concrete, because modern concrete has the lower durability in comparison to Roman concrete, which has resisted to atmospheric and sea water condition for more than 2,000 years. It turns out that in Roman concrete the main binder phase is C-A-S-H, which is attributed to the high durability of Roman concrete.

Coating for induction heating of glass

Department: Department of Glass and Ceramics, Faculty of Chemical Technology
Theses supervisor: doc. Dr. Ing. Martin Míka

Development and verification of hydrometallurgical routes for recovering critical metals from mineralized waters

Department: Department of Metals and Corrosion Engineering, Faculty of Chemical Technology
Theses supervisor: Ing. Nguyen Hong Vu, Ph.D.

Annotation

The thesis deals with development and verification of hydrometallurgical routes for recovering critical metals from mineralized waters (brines) on the territory of the Czech republic. The metals of interest are mainly lithium, rubidium, boron and others, which are present in koncentration up to few hundreds ppm in the chloride and sulfate solutions. The methods such as membrane separation, ion-exchange and solvent extraction will be studied for separation and concentration of the metals of interest. From the concentrated solutions the metals will be obtained in their compounds form by suitable combination of traditional hydrometallurgical methods.

Development of atmospheric corrosion monitoring techniques

Department: Department of Metals and Corrosion Engineering, Faculty of Chemical Technology
Also available in programme: Chemistry and Technology of Materials
Theses supervisor: doc. Ing. Milan Kouřil, Ph.D.

Annotation

Majority of metallic objects, like metallic structures, vehicles, construction elements, cultural heritage, etc., is exposed in atmosphere. It deals with extreme costs and safety risks originated in corrosion. Corrosion protection is applied to avoid or minimize the impacts. There are many corrosion monitoring techniques available which might be applied for verification of corrosion countermeasures efficiency. However, the techniques must be accommodated to specific conditions of the particular fields. The project is focused on development of new device for atmospheric corrosion monitoring. The principle of the technique based on the electrical resistance method will be inovated. New corrosion sensors, electronics, software and data transfer and treatment will developed as well.

Development of new ultralight-weight magnesium-based alloys for aviation

Department: Department of Metals and Corrosion Engineering, Faculty of Chemical Technology
Theses supervisor: Ing. Jiří Kubásek, Ph.D.

Annotation

Magnesium alloys are characterized by low density and a relatively high strength-to-weight ratio. From this point of view, they are interesting materials for applications in the automotive and aerospace industries. To improve the mechanical and corrosion properties, other metals like Al, Zn, Mn, Y, Nd, Gd, etc are very added. An interesting alloying element is Li, which as the lightest metal further reduces the density of the resulting alloy. Such behaviour is desirable for the potential reduction of CO2 emissions. Depending on the Li concentration, it is also possible to achieve a bcc structure and thus significantly improve the plasticity of the material. However, the strength and corrosion resistance of Mg-Li alloys are relatively poor, which prevents their wider use. This work aims to design and prepare by various processes including conventional casting and extrusion, as well as unconventional methods of powder metallurgy (mechanical alloying, spark plasma sintering - SPS, selective laser melting - SLM) magnesium alloys with Li and other alloying elements. The work will characterize in detail the influence of the microstructure on the mechanical and corrosion properties of the prepared materials. Besides, the optimization of selected preparation procedures leading to the required improvements of properties will be performed. Close cooperation with the organizations like Institute of Metals and Technology, Ljubljana and the Institute of Materials and Machine Mechanics, SAS, Bratislava is expected.

Effective properties of oxide and silicate ceramics and their dependence on composition, microstructure and temperature

Department: Department of Glass and Ceramics, Faculty of Chemical Technology

Annotation

This work concerns the effective properties of oxide and silicate ceramics, with a focus on the relations between composition, microstructure and elastic, thermophysical, thermoelastic, dielectric and piezoelectric properties. The student’s work includes the characterization of phase composition and grain size via X-ray diffraction, the microstructural characterization via microscopic image analysis, analytical calculations of effective properties via micromechanics (homogenization theory) for statistically isotropic and anisotropic (transversally isotropic) polycrystalline materials, analytical calculations and numerical modeling (computer simulation) of effective properties of multiphase materials (isotropic and transversally isotropic) and the comparison of theoretical predictions and the results and experimental measurements on real materials.

Environmental accessibility of selenium in power plant fly ashes

Department: Department of Solid State Chemistry, Faculty of Chemical Technology

Annotation

Selenium belongs both to esential and toxic elements, where the boundary between them is very thin. Power plant fly ashes deposited in landfills represent an important antrhropognic sourse of selenium. The stability of selenium in fly ashes is primarily affected by the quality of burned coal and actual combustion technology. In addition, the age of fly ash and the geochemistry of landfill area can play important role in selenium mobility at the place of its occurrence. The aim of the PhD Thesis will be to characterize the structure, mineralogical and chemical composition and surface properties of different types of fly ash. The next step will be to determine the amount and major forms of Se in fly ash (by sequential leaching), and to study their stabilty and interaction with surrounding environment, i.e. with soils, sediments, surface water and groundwater. The obtained results should help to estimate the gradient of environmental availability of selenium, together with its potential ecological risk.

Glazes with controlled reflectance

Department: Department of Glass and Ceramics, Faculty of Chemical Technology

Annotation

Ceramic materials are surface-treated by applying different types of coatings, the most common surface finishing of ceramic products are glazes- stable glassy coatings. By using suitable additives / pigments in glazes, the final properties of a ceramic product, such as roofing tilles, can be adjusted. The dissertation will focus on the preparation of glazing with controlled reflection of "cool roof" systems.

High-entropy alloys prepared by powder metallurgy techniques

Department: Department of Metals and Corrosion Engineering, Faculty of Chemical Technology
Theses supervisor: Ing. Filip Průša, Ph.D.

Annotation

Since the year 2004, the materials research gained a new way of focusing on special alloys made initially of five elements with equiatomic compositions. The newly discovered group of materials has been since then known as high-entropy alloys (HEA) due to a high entropy of mixing which allows creating predominantly solid solutions instead of intermetallic phases. These materials are known to be exhibiting a variety of excellent properties that often combine high strengths while maintaining good ductility, good corrosion resistance and others. The work will aim at the description of the microstructure-related properties of high-entropy alloys prepared by powder metallurgy techniques combining mechanical alloying and compaction via spark plasma sintering.

Hydrogels based on poly(vinyl alcohol)

Department: Department of Solid State Engineering, Faculty of Chemical Technology

Annotation

This work deals with the preparation and characterization of hydrogels films based on PVA. Hydrogels will be modificated physically (plasma, laser radiation) or/and chemically (doping with nanoparticles, drugs, dyes, etc.). Changes in surface and mechanical properties depending on the modification will be studied. The antibacterial properties and cytocompatibility of the prepared hydrogels will be determined.

Influence of Corrosion Products on Hydrogen Absorption to High Strength Steel

Department: Department of Metals and Corrosion Engineering, Faculty of Chemical Technology
Also available in programme: Chemistry and Technology of Materials
Theses supervisor: Ing. Tomáš Prošek, Ph.D.

Annotation

This project originates from industrial projects on hydrogen embrittlement (HE) of high strength steels, which are especially prone to hydrogen(H)-induced degradation. Since the development of these advanced steel grades with a huge potential of material and energy savings in many fields of human activity, the number of industry-funded studies on HE has been rising significantly. However, their practical focus does not allow for studying underlying mechanisms, although they are crucial for future development of products with improved application properties. This work aims at fundamental understanding of atmospheric corrosion as source for H insertion into iron, the principal element of all steel grades, as well as into selected steel grades. The role of corrosion products (CPs) in the H insertion during atmospheric corrosion will be clarified: How do composition and structure of CPs affect corrosion processes in view of H adsorption and absorption by e.g. reactions that involve a change of pH or a ratio between H reduction and other depolarization reactions? Which atmospheric conditions trigger these reactions? What is the mechanism of atomic H formation and entry?

Influence of radiolysis and bacterial extremophiles on lifetime of canister for radioactive waste repository

Department: Department of Metals and Corrosion Engineering, Faculty of Chemical Technology
Theses supervisor: doc. Ing. Jan Stoulil, Ph.D.

Annotation

The work will be focused on the influence of bentonite pore solution radiolysis by gamma radiation on the oxidation ability, stability and semiconductive properties of passive layer on the 316L stainless steel. In addition will be studied the possibility of the formation of sulphate-reducing bacteria biofilm and the effect of metabolites on the susceptibility to pitting and stress corrosion cracking.

Intelligent materials and surfaces - switching between "ultra" states

Department: Department of Solid State Engineering, Faculty of Chemical Technology
Theses supervisor: Mgr. Oleksiy Lyutakov, Ph.D.

Interaction of glass containing biogenic components with aqueous solutions

Department: Department of Glass and Ceramics, Faculty of Chemical Technology

Annotation

In addition to the traditional use of glass as containers or in the building and automotive industries, some glass can be used in medicine, pharmacy or agriculture. The aim of the thesis will be to explore and describe the kinetics of interaction of appropriately selected or prepared soluble phosphorous and phosphosilicate and glass with other biogenic components) with aqueous solutions simulating soil or body environment and to design glass that can be used as slowly soluble fertilizers or bioresorbable materials in medicine.

Large deformations of ceramic powder compacts and fracture of porous and cellular ceramics

Department: Department of Glass and Ceramics, Faculty of Chemical Technology
Also available in programme: Chemistry and Technology of Materials

Annotation

Large deformations play a significant role in ceramic technology, because all pressing operations rely on the quasi-plastic behavior of powder systems during consolidation. On the other hand, also porous and cellular ceramics, including those produced via additive manufacturing, e.g. 3D printing, exhibit quasi-plastic behavior during compression. This PhD topic combines theory-based analytical modeling and computer-based numerical modeling of large deformations with real-world experiments performed on ceramic materials via different mechanical tests, mainly axial and diametral compression. The student is required to have a solid background knowledge in ceramic science and technology as well as the ability to combine computer modeling with experimental work on real materials from both fine and coarse ceramics.

Mechanism of the formation of intermetallics in mechanical alloying

Department: Department of Metals and Corrosion Engineering, Faculty of Chemical Technology
Theses supervisor: doc. Ing. Pavel Novák, Ph.D.

Annotation

Mechanical alloying is a popular technology for the preparation of powders of alloys or intermediary compounds (e.g. intermetallics, carbides or borides) by high energy mechanical milling. The high popularity of the method is given by the fact that it usually leads to nanostructured materials and that even non-miscible elements can create solid solutions during mechanical alloying. Even though the result is known and there are many descriptions available, the mechanism of the formation of intermetallics in this process is not fully understood yet. The reasons are probably in a large variety of possible process parameters and by impossibility to measure the temperature inside the powder in the milling jar. This work proposes following concept: indirect determination of the dependence of the peak powder temperature on milling conditions (rpm, ball-to-powder ratio, ball size) by the use of thermally decomposing salts, comparison of phase composition of the mechanically alloyed powder with the reference powder mixture exposed in the furnace to the detected peak temperature and observation of the time development of the microstructure and phase composition by XRD and electron microscopy (SEM, TEM). The mechanism will be observed on several different systems containing brittle and ductile powders (e.g. Ti-Al, Ti-Si, Ti-Al-Si) and the general conclusion regarding the mechanical alloying mechanism will be formulated.

Melting processes in vitrification technologies

Department: Laboratory of Inorganic Materials, Faculty of Chemical Technology
Also available in programme: Chemistry and Technology of Materials

Annotation

The analysis of the processes during the vitrification process is performed using a mathematical model. Input data of the model will be obtained by a set of experimental methods including high temperature monitoring of melting processes, analysis of released gases, thermal analysis and determination of oxidative reduction equilibrium in melts.

Metallic materials and hydrogen

Department: Department of Metals and Corrosion Engineering, Faculty of Chemical Technology
Theses supervisor: prof. Dr. Ing. Dalibor Vojtěch

Metallic materials prepared by advanced 3D printing technologies

Department: Department of Metals and Corrosion Engineering, Faculty of Chemical Technology
Theses supervisor: prof. Dr. Ing. Dalibor Vojtěch

Annotation

3D printing methods like selective laser melting (SLM) or other, are prospective for the fabrication of complex structural parts and medical implants because of their ability to produce very complex shapes. In the work, structures, mechanical, corrosion and biological properties of Ti based alloys, stainless or high-strength steels, biodegradable alloys or light-weight alloys prepared by various 3D printing processes will be investigated. In addition, the relationships between process parameters of 3D printing and characteristics of resulting products will be evaluated. Results of the study will propose process parameters the most suitable for obtaining desirable products. The work will also be focused on the development of novel 3D printing methods based on metal deposition.

Micro and nanorobots based on photocatalytic materials for biomedical applications

Department: Department of Inorganic Chemistry, Faculty of Chemical Technology
Theses supervisor: doc. RNDr. Martin Pumera, Ph.D.

Annotation

Candidate will construct microrobots powered by chemicals for drug delivery and cancer treatment using inorganic chemistry approach. Candidate will learn how to fabricate micro and nanorobots by electrochemical and physical vapor deposition approach, how to operate and remotely control micro and nanorobots and how to chemically program them. More on www.nanorobots.cz

Micro and nanorobots for targeted drugs delivery to cancer cells

Department: Department of Inorganic Chemistry, Faculty of Chemical Technology
Theses supervisor: doc. RNDr. Martin Pumera, Ph.D.

Annotation

Candidate will construct microrobots powered by chemicals for drug delivery and cancer treatment using inorganic chemistry approach based on photoactive systems. Candidate will learn how to fabricate micro and nanorobots by electrochemical and physical vapor deposition approach, how to operate and remotely control micro and nanorobots and how to chemically program them. More onwww.nanorobots.cz

Multicomponent silicate and borate structures to be used in thermal neutrons detection

Department: Department of Inorganic Chemistry, Faculty of Chemical Technology
Theses supervisor: Ing. Vít Jakeš, Ph.D.

Annotation

This work will be focused on multi-component silicate and borate structures with substitution of activator ions in order to increase the phase and chemical resistivity of the material and to improve the scintillation response in the detection of neutron radiation.

New method of in vitro test of glass and glass-ceramic materials for bone tissue replacement

Department: Department of Glass and Ceramics, Faculty of Chemical Technology
Theses supervisor: doc. Dr. Ing. Dana Rohanová

Annotation

Substitution of hard bone tissue by glass, glass-ceramic, or ceramics material is a common practice today. Each, potentially bioactive material has to be studied by a series of in vitro and in vivo tests. In vitro tests used for an inorganic biomaterial is now described in ISO 23317:2014. Nowadays, this standard is obsolete and needs a general revision. The recommended form of the tested material (solid discs) and testing solution (Simulated Body Fluid - SBF) seems to be not suitable. SBF simulates the inorganic part of blood plasma and is buffered with TRIS+HCl buffer. However, this buffer interacts with the tested glass and shifts the in vitro test results to false-positive values. This work will be focused on the setting of the new conditions of in vitro tests for better characterization of tested biomaterials.

New tool steels and their processing by non-conventional techniques

Department: Department of Metals and Corrosion Engineering, Faculty of Chemical Technology
Theses supervisor: doc. Ing. Pavel Novák, Ph.D.

Annotation

Tool steels reach very good mechanical properties, especially hardness and wear resistance, due to the content of carbide-forming elements and suitable heat treatment. The used scale of the carbide-formers comprises W, V, Mo and Cr, while some of them (W, V) are currently listed as critical raw materials by European commission. So it is desirable to substitute them. The suibstitution of the alloying elements is the subject of research for many years for various reasons and led to the formation of many grades of currently used tool steels. However, some of the potential alloying elements cause problems during processing by conventional metallurgical routes. This work is focused on the development of a new tool steel alloyed by non-conventional elements, aiming to form the material, which will be interesting from the viewpoints of both the mechanical proporties and the sustainability. For the processing, the techniques comprising 3D printing by "Direct Energy Deposition" method, which application for high-carbon tool steel will be unique, and the powder metallurgy methods comprising melt atomization or mechanical alloying and spark plasma sintering.

Photochemistry on the base of noble metals nanostructures

Department: Department of Solid State Engineering, Faculty of Chemical Technology
Theses supervisor: Mgr. Oleksiy Lyutakov, Ph.D.

Plasmon- and electro-chemical active materials for relevant chemical transformations

Department: Department of Solid State Engineering, Faculty of Chemical Technology
Theses supervisor: Mgr. Oleksiy Lyutakov, Ph.D.

Polymer materials for industrial 3D printing

Department: Department of Polymers, Faculty of Chemical Technology
Theses supervisor: doc. Ing. Antonín Kuta, CSc.

Precipitation of calcium phosphates during interaction of biomaterials with simulated body fluids

Department: Department of Glass and Ceramics, Faculty of Chemical Technology

Annotation

The study will be oriented on precipitation of calcium phosphates from selected simulated body fluids. The aim is to experimentaly measure the kinetics of phosphates precipitation and describe it using chosen or newly developed physico-chemical models

Preparation and crystal growth of scintillating materials based on alkali halides and study of new doping concepts

Department: Department of Inorganic Chemistry, Faculty of Chemical Technology

Annotation

The topic of this work will be focused on the preparation and crystal growth of scintillating materials based on hygroscopic alkali halides, e.g. sodium iodide (NaI), cesium iodide (CsI), doped with monovalent cations (e.g. Tl), by vertical Bridgman and micro-pulling-down methods. The work will be performed in collaboration with the company NUVIA a.s. and Physical Institute, ASCR. The study will aim on the optimization of the growth technology of bulk NaI:Tl single crystals prepared by the vertical Bridgman method and on the study of new co-doping concepts in alkali halides (NaI:Tl) by cations of higher valence state, e.g. Sr, Ca, Eu2+. The composition (elemental and phase) of prepared materials and their crystals as well as the thermal, optical, luminescence, and scintillation properties will be studied. The goal of this work is to improve the optical quality of prepared crystals (for industrial applications), the optimization of the crystals composition to improve the scintillation parameters such as high light yield and fast scintillation response. This work will be realized partly under employment contract with the possibility of future career development at NUVIA.a.s.

Properties and structure of rapidly solidified aluminium alloys with natural alloys

Department: Department of Metals and Corrosion Engineering, Faculty of Chemical Technology

Annotation

Rapidly solidified aluminium alloys with transition metals have excellent mechanical properties and elevated thermal stability when compared to conventional alloys. In this work, the alloys prepared by alloying aluminium by different amount of natural alloys obtained by reduction of polymetallic ore will be studied. Structures, mechanical properties and elevated temperature behaviour of these materials will be described. Study of these materials and their properties will enable the design of technology to obtain materials with the required properties from natural sources.

Refractory geopolymer material

Department: Department of Glass and Ceramics, Faculty of Chemical Technology
Theses supervisor: Ing. Martina Šídlová, Ph.D.

Annotation

The aim of the dissertation thesis will be the preparation of a refractory geopolymer material formed by alkaline activation of aluminosilicates. Industrial and waste materials such as metakaolins, fly ash and blast furnace slag are considered as a source of aluminosilicates. The work will include the study of various possibilities of alkaline activation of aluminosilicates and the influence of refractory fillers. The workability and solidification and hardening processes of the prepared materials will be studied. Part of the work will include the determination of refractory and thermomechanical properties of prepared materials, which include flexural strength at high temperatures and heat resistance. The prepared geopolymers will be studied by a number of methods, such as XRD, SEM, NMR, DTA and mercury porosimetry.

Regeneration of CO2 using renewable energy sources

Department: Department of Solid State Engineering, Faculty of Chemical Technology

Silicate glass surface

Department: Department of Glass and Ceramics, Faculty of Chemical Technology
Also available in programme: Chemistry and Technology of Materials

Annotation

Glass surface is not fully explored, but the surface features are closely related to its mechanical and chemical properties. The work will focus to glass surface preparation, its characterization and well-defined modification. The relation of the surface with some properties will be further studied.

Smart materials for optics and electronics

Department: Department of Solid State Engineering, Faculty of Chemical Technology
Theses supervisor: Mgr. Oleksiy Lyutakov, Ph.D.

Special glasses

Department: Laboratory of Inorganic Materials, Faculty of Chemical Technology
Also available in programme: Chemistry and Technology of Materials
Theses supervisor: Ing. Petr Kostka, Ph.D.

Annotation

The work will focus on the preparation and study of new glasses containing heavy metal compounds, especially heavy metal oxides. Heavy metal oxide glasses in which the glass network is formed by oxides such as e.g. TeO2, GeO2 or Sb2O3 instead of SiO2 are studied for their characteristic properties. In comparison to conventional glasses they particularly excel with their wide transparency interval reaching to much longer wavelengths than in silicate glasses, higher refractive index, and non-linear optical properties. They are also interesting because of the high quantum yield of radiative transitions of rare earth ions embedded in their glass networks, which have low phonon energies, and because of their ability to adopt high concentrations of rare earths ions. The characterization of the prepared materials will include determination of their basic physicochemical properties such as density, molar volume, thermal stability, chemical resistance, hardness, optical transparency, refractive index etc. The correlation between the structural units of the glass network and resulting properties will be investigated and the influence of technological conditions during glass preparation on glass properties will be studied. The Laboratory cooperates with foreign research institutions.

Stability of soil ternary complexes with toxic oxyanion (As/Sb/Se). Effect of iron and organic carbon.

Department: Department of Solid State Chemistry, Faculty of Chemical Technology
Also available in programme: Chemistry and Technology of Materials

Annotation

In soil profiles several toxic elements (arsenic, antimony, selenium) occur as oxyanions primarily bound to HFO phases, forming stable surface complexes. This process runs as the balanced adsorption of oxyanions from a soil solution to active adsorption sites of soil particles, in the presence of another anions and dissolved organic matter. During this process the binary and/or ternary soil complexes of HFO, organic matter and oxyanion have been formed. The adsorption and complexation proceed in a colloid environment, which is susceptible to the ionic strength of soil solution (stabilization or aggregation of particles). According to recent results the stability of formed ternary complexes is critical for the long-term stability of binding oxyanions. The aim of this work will be to qualify the formation of organic matter – ferric oxide – anionic particle ternary komplexes, to describe their structure and binding properties, and to estimate the environmental impact to the stability of complex components, particularly the toxic oxyanionic forms.

Structure of glass and its interfaces

Department: Department of Glass and Ceramics, Faculty of Chemical Technology
Also available in programme: Chemistry and Technology of Materials

Annotation

Glass structure is described by means of structural quantifiers (radial distribution functions, coordination numbers, Q-motifs, rings, etc.) on various geometrical and topological levels. Structure can be theoretically mimicked by Molecular dynamics on the atomic level. The work aims to the theoretical description of glass structure and its relation to the glass transition. Except for the theoretical description, simulations of the chosen amorphous systems and their interfaces will be utilised.

Study and application of nanostructures induced by high energy excimer laser

Department: Department of Solid State Engineering, Faculty of Chemical Technology

Annotation

The work will focus on the study of the interaction of polymeric materials with a unique high-power excimer laser. Periodic nanostructures on a polymer will be studied, especially their applications in the field of tissue engineering with a focus on the possibility of single cell analysis. Periodic nano-patterns (LIPSS) will be used to monitor the interaction primarily with mammalian cells, as well as their antibacterial properties, especially in combination with selected surface active substances. The work will also focus on the exposure of thin carbon nanolayers and carbon composites. Within the interaction of materials with a high energy excimer laser, also the possibilities of preparation of new materials, such as Q-carbon with ferroelectric properties, will be investigated.

Study of initiation and propagation of microstructural defects in metallic materials by X-ray microtomography

Department: Department of Metals and Corrosion Engineering, Faculty of Chemical Technology
Theses supervisor: Ing. Tomáš Prošek, Ph.D.

Annotation

Rapid development of X-ray microtomography (μCT) in past two decades enabled its application in studies of metallic materials. Thanks to affordable μCT apparatuses with high resolution around or even below 1 μm, it is now possible to follow initiation and propagation of localized corrosion and environmentally assisted cracking in real time. A new, unique device available in Technopark Kralupy of UCT Prague with high resolution and equipped with integrated tensile testing stand and climatic chamber allows for in situ experiments in atmospheric conditions. The PhD thesis will be focused on two groups of modern iron-based materials, high strength steels and stainless steels. High strength steels are prone to hydrogen embrittlement, which will be studied in situ as a consequence of entry of atomic hydrogen generated by atmospheric corrosion. The application window of stainless steel in atmospheric exposure conditions is limited by the risk of pitting corrosion and stress corrosion cracking initiation under deposits rich with chloride ions. The study will focus mainly on the crack initiation in locations of microstructural defects and corrosion pits and the role of climatic parameters in crack propagation. The goal of the thesis will be to describe mechanisms of the initiation and propagation of these corrosion-induced defects.

Supported catalysts with active layer of mixed transition metal oxides

Department: Department of Solid State Chemistry, Faculty of Chemical Technology
Also available in programme: Chemistry and Technology of Materials

Annotation

The work is focused on preparation of catalytically active mixed oxides of transition metals deposited on preformed metal and ceramic supports. Modification of supports surface, coating with oxide interlayers for active components anchoring, and subsequent deposition of the catalytically active binary and ternary Ni, Cu, Co, and Mn mixed oxides will be studied to achieve good adhesion of the deposited oxides to the supports. The aim of the work is to obtain a complex information about the role of supports surface pretreatment, procedure of precursors deposition, and following thermal treatment on the composition, physical chemical properties, and catalytic activity of the deposited mixed oxide catalysts.

Surface modifications of metallic biomaterials

Department: Department of Metals and Corrosion Engineering, Faculty of Chemical Technology
Theses supervisor: doc. Ing. Jaroslav Fojt, Ph.D.

Annotation

Metallic biomaterials still play an irreplaceable role in medicine. The surface state significantly influences the properties and behaviour of biomaterials. This is especially the interaction on the metal-electrolyte phase boundary, i.e. biocompatibility and corrosion behaviour, although mechanical properties can also be affected. In the course of the work, the surfaces of metallic biomaterials will be modified in order to increase their utility properties. The modified surfaces will then be evaluated using standard material, electrochemical and spectroscopic methods.

Suspension rheology – from theoretical foundations to practical applications

Department: Department of Glass and Ceramics, Faculty of Chemical Technology
Also available in programme: Chemistry and Technology of Materials

Annotation

The rheology of suspensions is a topic of widespread interest that is important in ceramic technology and many other fields. This PhD topic involves the theoretical treatment of basic problems in suspension rheology, mainly the dependence of the effective viscosity on particle shape, size and size distribution, as well as practical work with purely viscous non-Newtonian fluids as well as viscoelastic systems, mainly using rotational viscometry and oscillatory rheometry. The student is required to have a general chemical engineering background, not necessarily based on (and by no means limited to) ceramic technology.

Tribological properties of metallic biomaterials

Department: Department of Metals and Corrosion Engineering, Faculty of Chemical Technology
Theses supervisor: doc. Ing. Pavel Novák, Ph.D.

Annotation

Metallic biomaterials (titatium alloys, stainless steel, cobalt alloys) are frequently applied as joint replacement in human body. During the use of these materials, the wear occurs depending on the material and the wear debris can enter the tissue, causing the inflammation. Therefore there is an aim to apply the materials with highest possible wear resistance and even to improve it by suitable coatings. However, wear resistance of metallic biomaterials is not so easy to be determined, because the corrosion attack by the componets of the body environment plays important role in addition to the contact with the counterpart (acetabulum implant). This work is focused on the determination of suitable test conditions, simulating tribological and tribocorrosion loading joint and other specific (e.g. spinal) implants and determination of their tribological and tribocorrosion behaviour. The effect of various parameters - mechanical properties, microstructure and phase composition of the alloys and processing route (casting, forming, powder metallurgy, 3D print) - on resulting tribological characteristics will be described.

Tuning of defect-related luminescence in single- and nano-crystalline ZnO using systematic rare-earth doping for the use in photonics

Department: Department of Inorganic Chemistry, Faculty of Chemical Technology

Annotation

Project is dealing with very attractive material ZnO design doped with rare-earth (RE) from experimental as well as theoretical point of view. Newly project going to respect to the modification and creation of intrinsic and extrinsic ZnO defects and how the combination of RE with defects or other elements can be utilized for the tuning of UV-VIS-NIR luminescence. Fabricated ZnO single-crystalline and nanostructured samples will be tested in photonic devices with tunable luminescence in UV-VIS-NIR and for degradation of water pollutants.

Zinc alloys for medical applications prepared by modern methods of powder metallurgy

Department: Department of Metals and Corrosion Engineering, Faculty of Chemical Technology
Theses supervisor: Ing. Jiří Kubásek, Ph.D.

Annotation

Zinc and its alloys are considered as the biodegradable materials that can find applications such as orthopaedic implants or stents. The main advantage of zinc lies mainly in the acceptable corrosion rate and harmless degradation products. Corrosion of zinc does not lead to the release of hydrogen gas, which otherwise complicates the situation in the case of the degradation of magnesium-based materials. The main disadvantages of zinc and its alloys are poorer mechanical properties, especially yield strength, ultimate strength and ductility. Improvement of these properties can be achieved, for example, by suitable alloying. However, considering biocompatibility, the most acceptable alloying elements (Mg, Ca, Sr) are characterized by negligible solubility in the solid solution of zinc, which leads in conventional processing to the formation of various intermetallic phases. The aim of this work is to prepare and characterize in detail new biodegradable materials based on Zn-Mg-Ca / Sr prepared by powder metallurgy processes including mechanical alloying, atomization, melt spinning and powder compaction by extrusion processes, spark plasma sintering (SPS) and selective laser melting (SLM). ). The prepared materials should be characterized by a very fine microstructure positively affecting the mechanical properties and the uniformity of corrosion attack. The work will further focus on the potential addition of a small amount of other alloying elements such as Ag and Cu, which can further contribute to the improvement of the antibacterial properties of the material. Close cooperation with the organizations like Institute of Metals and Technology, Ljubljana and the Institute of Materials and Machine Mechanics, SAS, Bratislava is expected.


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