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Original title in Czech: Pokročilé materiályCEITEC VUTAbbreviation: PMAcad. year: 2018/2019
Programme: Advanced Materials and Nanosciences
Length of Study: 4 years
Accredited from: 17.7.2012Accredited until: 31.7.2020
Guarantor
prof. RNDr. Josef Jančář, CSc.
Issued topics of Doctoral Study Program
Development of advanced ceramic materials has emphasis on understanding the mechanical properties of ceramics and on improving their strength, toughness and damage resistance. Microstructure tailoring is crucial tool for this research, however localized microstructure tailoring is limited by possible localization of chemical or density compositions. The aim of this Ph.D. study is an investigation of the local application of rapid heating on microstructure tailoring. The proposed research is mainly focused on energy transfer via radiation and its new potential for control of microstructure. Future applications are in development of unique ceramic microstructures with better mechanical properties.
Tutor: Salamon David, doc. Ing., Ph.D.
The aim of this dissertation is to use chitin/chitosan and their new derivatives (with different alkyl chains) and collagen to prepare 3D scaffold. The new chitin/chitosan derivatives will be used as matrices for different inorganic material (nano/micro hydroxyapatite, iron oxide). The chemical-physical interactions of the new nanocomposite will characterized by different tools (FTIR-TGA, NMR, XRD, SEM, TEM). The antibacterial, cytotoxicity, healing and histology of the new 3D bioscaffold will be analyzed and evaluated.
Tutor: Abdellatif Abdelmohsen Moustafa, M.Sc., Ph.D.
Dissertation focuses on the study of ceramic high-temperature fuel cells and electrochemical reactors using organic compounds (hydrocarbons, aliphatic alcohols, etc.) as fuel or reactants. The experimental part of dissertation will deal with the synthesis of nanoparticles and colloidal precursors for preparation of ceramic high-temperature electrolytes, anodes and cathodes and manufacture of components, fuel cells and electrochemical reactors (electrolyte, electrodes, ..). To measure the electrical parameters of fuel cells and electrochemical parameters of electrochemical reactors the device of FulCellmaterials company for testing fuel cells, combined with a high-impedance spectroscopy and mass spectrometry will be used. The main aim of the dissertation is finding new electroceramic materials for reducing operating temperature of the fuel cells and to achieve maximum electrochemical efficiency of reactors.
Tutor: Cihlář Jaroslav, prof. RNDr., CSc.
The subject of the PhD study is focused on shaping and consolidation of nanoceramic oxide particles. The main task of the student will contain a study of bulk colloidal ceramics processing using ceramic particles with size below 100 nm via colloidal shaping methods. The research will concern primarily with methods of direct consolidation of ceramic particles. A common difficulty of all these methods lies in the preparation of a stable concentrated suspension of nanoparticles with appropriate viscosity. The solution of the problem assumes understanding and utilization of colloidal chemistry and rheology of ceramic suspensions.
Tutor: Trunec Martin, prof. Ing., Dr.
For more details contact the supervisor.
Study of the damage in materials working at high temperatures in order to increase the fatigue and creep life and improve the energy efficiency of machines and equipment in aeronautics and energy production. Adopt demanding experimental techniques as computer controlled electrohydraulic testing machines and modern analytical methods (FESEM, EBSD FIB, TEM et al.) and study the behavior of nickel superalloys in conditions close to the service conditions. The principal damaging mechanisms during isothermal, high temperature fatigue in interaction with creep damage (dwells in a cycle) and during thermomechanical cyclic loading will be analyzed and used in prediction of service life.
Tutor: Polák Jaroslav, prof. RNDr., DrSc.
For detailed info please contact the supervisor.
Tutor: Vojtová Lucy, doc. Ing., Ph.D.
Effectiveness of stabilizers (antioxidants) in the polymer matrix is given not only by their chemical structure enabling them reactions with oxidative degradation intermediates, but also by their mobility within the polymer matrix and resisting the outer deteriorative impacts, capable of decreasing their level in polymer. Physical behaviour of stabilizer in the polymer matrix basically influences its polymer-protective performance. The presence of modifying nanofiller, which even in relatively low concentrations effectively impacts the physical behaviour of macromolecules and consequently changes physical properties of polymer matrix, influences also the behaviour and effectiveness of stabilizer system. Investigation of the effect of presence of nanofiller on behaviour and function of particular groups of polymer stabilizers (processing, long-term, UV) in dependence on their chemical structure should be the objective of this doctoral thesis.
Tutor: Tocháček Jiří, doc. RNDr., CSc.
Tutor: Jančář Josef, prof. RNDr., CSc.
The main objective of the study will be fabrication and characterization of electrospun ceramic based fibers for electric and electrochemical applications.
Tutor: Částková Klára, doc. Ing., Ph.D.
Composite materials exhibit outstanding properties thanks to suitable junction of two different materials. However, sharp materials interface can lead to degradation of the properties. Conditions of crack initiation in places of sharp shape and materials changes will be determined and evaluated using the procedures of generalized fracture mechanics.
Tutor: Klusák Jan, doc. Ing., Ph.D.
For more details please contact the supervisor.
Self-assembly has significant influence to the deformation properties of hydrogels. This influence is not described in detail in literature. The task for PhD-student will be mapping of the different mechanisms of self-assembly. Selected mechanisms will be modelled by molecular dynamics. By this model, the student will analyze the transformation of self-assembly structures during deformation. Their influence to deformation behaviour will be investigated.
Tutor: Žídek Jan, Mgr., Ph.D.
So-called high-entropy alloys represent one of the most promising classes of modern materials. They are characterized by specific atomic distributions when a number of chemical species randomly occupy crystalline lattice positions. Combination of different elements and their concentrations provide materials with a wide range of unique properties. After years of intensive research focused on mechanical properties of high entropy alloys, the international scientific community has become recently interested in their magnetic properties. These will be the main topic of the proposed PhD program. The planned measurements will be supported by theoretical simulations. The research will be based on a recent cooperation of Czech, German, Austrian and American scientists: O. Schneeweiss, M. Friák, M. Dudová, D. Holec, M. Šob, D. Kriegner, V. Holý, P. Beran, E. P. George, J. Neugebauer, and A. Dlouhý, Magnetic properties of the CrMnFeCoNi high-entropy alloy, Physical Review B 96 (2017) 014437.
Tutor: Friák Martin, Mgr., Ph.D.
The topic of this PhD study is a development of processing methods for a unique manufacturing of ceramic prototypes and small series of complex ceramic parts using 3D milling. The dissertation is focused on research into semiproducts (blanks) of advanced ceramics for 3D milling based on zirconia, alumina, calcium phosphates and other materials for dental and structural applications and prospectively even for customized complex-shaped surgical implants. The blanks will be prepared for both dense ceramic parts and bodies from a ceramic foam. For preparation of large and complex parts shaped machinable blanks will be developed that can ensure reliable and economical production of such parts. The blanks will be processed by CAD/CAM methods utilizing CNC milling.
The aim of the study is to delimit a region of mechanical stability of selected crystals under nonhydrostatic triaxial loading. For this purpose, phonon spectra will be computed for the crystals in their ground states as well as in deformed states. Phonon spectra will be obtained using force constants that will be computed by the VASP code.
Tutor: Černý Miroslav, prof. Mgr., Ph.D.
In this work the student will become familiar with problems of electrical and electrochemical measurements (especially impedance, voltage and current distribution on the electrodes and the flow of material in electrochemical cells). The student will concurrently learn the principles of computer modeling through the method "Finite Elements Modelling" while using commercial software. Computational research will lead to the clarification of the best practice for practical measurements, proposals for possible new practical geometry and the feedbacks to colleagues who are developing samples of functional designs.
Tutor: Vanýsek Petr, prof. RNDr., CSc.
The topic of the dissertation is the study of polymer/inorganic composite biomaterials with a hierarchical structure composed of a nanofiber and nanoparticle components. Nanofiber polymeric components are prepared by methods electrospinning or centrifugal spinning and bioactive inorganic nanoparticles by ultrasonic or microwave synthesis. Preparation of hierarchical structures (biocomposites) will be studied by means of template methods and 3D-printing. The structure, mechanical and biochemical properties of biocomposites and their interactions with bone cells and tissues will be evaluated.
In this work the students will become familiar with current issues in energy storage electrochemical redox flow cells and with monitoring the extent of their state of charge. The research will lead to the design and development of methods that can be used for continuous monitoring of the state of charge status. Two basic principles will be used: first, optical tracking in those systems where the spectrum varies coloration due to state of charge, and second, in the absence of optical changes, measuring electrochemical properties.
FePd, FePt, CoPt, and other magnetic layers became extensively investigated because of their potential application in ultrahigh magnetic recording media. The aim of the study is to delimit a theoretical region of stability for selected crystals of binary alloys. Student will make a model of such crystals under simulated deformations using some of available ab initio codes. In particular, magnetic phase transitions will be studied during the deformation. Results will be compared with available literature data measured on thin films.
Topic of dissertation relates of photoelectrochemical splitting of water and organic materials (aliphatic alcohols, aldehydes, etc.) in the visible spectrum. Experimental work will deal with the synthesis of photocatalytic active inorganic semiconductors and their modifications (eg. by carbonaceous phases), the preparation of stable colloidal precursors for the deposition of photoactive layers, preparing of fotoelectrods and photoelectrochemical cells (reactors) and measuring of photoelectric parameters of photoelectrochemical cells and photocatalytic efficiency of photoreactors. Dissertation will also be focused on the study of the structure of the photocatalytic active systems and their interpetation by appropriate structural models and on design of fotoelectrocatalytic reactors in order to achieve maximum efficiency in the transformation of reactants and hydrogen production.
This Ph.D. thesis will be focused on the investigation of semiconducting and optical properties of thin layers of metal oxides (such as TiO2, WO3, Ta2O5, etc.). Layers of various oxides (and their mixtures) will be prepared by various means: thermal oxidation, anodic oxidation, atomic layer deposition, etc. State-of-art characterization techniques will be utilized to investigate fundamental properties of these layers. Further treatment of these layers using doping, advanced lithographic techniques, focused-ion beam, etc. is also planned to obtain novel semiconducting structures with interesting electronic, catalytic and optical properties for various applications (solar cells, batteries, capacitors, etc.).
Tutor: Macák Jan, Dr. Ing.
Special engineering and bio-mechanical applications require the use of advanced materials. Because of their cost and purpose it is essential to ensure adequate strength of components made from them over the lifetime. From the viewpoint of material fatigue the number of load cycles often exceeds 107. Materials for these special applications will be tested in very high cycle fatigue regime, i.e. from 106 to 1010 cycles. Numerical simulations by FEM will be used to design specimens, tests will be carried out on ultrasonic testing machine, failure mechanisms will be searched using a scanning electron microscope.
The student will learn in this project about current issues of energy storage using electrochemical redox flow cells. The experimental component of the work will lead to the improvement of the cells based on the principle of the vanadium system and to the design and development of new cells, not using the vanadium redox couples.
Research in bioceramics is very rapid and directed towards application and preparation of customized scaffolds is required. Porosity, shape of pores and internal channels are main parameters which have to be balanced to achieve tailored biological and mechanical properties. Aim of this Ph.D. study is tailoring of ceramic microstructure by customized shaping by combination of processing methods such as ice-templating, microtemplating, and slip-casting. Main investigated properties of ceramic bio scaffolds are porosity and microchannels architecture with focus on potential application in bone replacements or inorganic cells guides.
In the course of the research the student will become familiar with the current status of insulation materials and their behavior at low, room and high temperatures. The research will lead to the design and development of methods that can be used to continuously monitor the insulation properties of the dielectrics and to predict the practical life span of the insulators and their resistance to extreme temperatures. The principal experimental method will be the measurement of complex impedance at variable temperatures as well as the measurement of DC resistance and loss factor at 50 Hz. The methodology will be supplemented by monitoring aging due to sunlight exposure.
The work is focused on the study of 3D-printing of advanced ceramic materials based on new 3D-photolithographic method (LCM- Lithography-based Ceramic Manufacturing) by means of the CeraFab 7500 equipment (Lithoz GmbH). Work will deal with preparation and study of stable homogeneous colloidal dispersions containing light-sensitive polymers and ceramic fillers to obtain dispersions suitable for 3D-printing of advanced oxide ceramics. PhD student will deal with issues of theoretical study and with experimental study of the properties of colloidal polymer-ceramic dispersions, dispersion behavior at 3D-printing and sintering of printed objects and evaluation of physical, mechanical and chemical properties of printed ceramics in relation to the structure of ceramics and conditions of the technological process.
Layered transition metal dichalcogenides represent some of the most investigated 2-D nanomaterials nowadays. They are typically prepared by various top-down methods and may contain defects that limit their potential use. Among bottom-up methods, atomic layers deposition profiles as the method of the choice to prepare these materials in the form of uniform thin layers. This method is feasible to prepare various sulphides and selenides in a controllable fashion. The aim of this Ph.D. study is therefore synthesis of new types of layered transition metal dichalcogenides sulphides and selenides (such as (MoS2, MoSe2, etc.) by ALD on various substrates. Characterization of the resulting materials will be realized by a whole range of techniques. These materials are expected to have very attractive properties that will be characterized and exploited for various applications.
Fiberous materials represent scientifically and technologically highly interesting materials, owing to their easy preparation, compositional flexibility, dimensionality, possibility to tune fiber dimensions vs. porosity, etc. The aim of this thesis is to develop new compositions and structures of fibers with diameter on the sub-micron or micron scale. The focus will be given on polymeric as well as inorganic fibers (in particular oxides) that have potential for filtration and catalytic applications. Two techniques will be mainly used: centrifugal spinning and electrospinning. Various shapes of fiberous structures will be investigated, including planar layers, bulky forms, fibers with a specific orientation, etc. The conducted research will be very application oriented. Cooperation with partners from industry is expected for the testing of the application potential of developed fibers. In particular, part of the thesis will be also devoted to the development of electrically conducting fibers for various applications in textile, electronic and military industries.
Processing of advanced ceramic materials have been developed during a hundred year for wide range of applications. Recently, chemical analysis have reached new level state of art, which allows analysis of very low concentration of various elements in the ceramic matrix. Dopants or impurities plays crucial role in design of mechanical and functional properties of ceramic materials. Aim of this Ph.D. study is quantitative, qualitative and distribution analyses of elements added or naturally occurring in ceramics at very low concentrations. High resolution transmission electron microscopy will be applied to trace the presence of low concentration dopants in ceramic microstructure. The main research focus will be on distribution of dopants in the microstructure after rapid sintering.
For further details, please contact mafri@ipm.cz.
The PhD work will be concerned with manufacturing of complex ceramic parts with internal structure using the LCM method (Lithography-based Ceramic Manufacturing). The research will be focused on investigation of ceramic suspensions for the LCM method and on correlation between the processing conditions of LCM method and the properties of the final ceramic parts. The research will be aimed at applications in medicine. The internal structure of calcium phosphate bioscaffolds for bone regeneration will be optimized with respect to modification of ceramic skeleton with inorganic as well as organic biopolymers.