Dr. Valery Shklover: MSc in Materials for Electronics and PhD in Physical Chemistry "X-Ray study of organosilicon compounds"
Co-organizer of Symposium J: "High-temperature photonic structures" at 2009 MRS Spring Meeting (San Francisco, April 13-17, 2009).
Organizer of the Workshop "Thermal Protection Coatings for Space Applications", Department of Materials, ETH Zürich, October 11, 12. 2010
Principal Investigator of the CCMX project "Protective coatings with managed thermal conductivity for machining difficult-to-cut materials", 2011-2013
Point-of-contact responsible for the coordination and execution of Cooperation ETHZ-NASA in Modeling and Experimental Characterization of Thermal Protection System Materials ETHZ-NASA, 2011-2013
Dr. Michael Böttger: MSc thesis in Physics "Studies of Magnetization and dHvA Effects in Organic Supeconductors of the Type kappa-(BEDT-TTF)2X", PhD thesis "Thermoelectric Properties of ZnSb"
Dr. Leonid Braginsky: MSc in Theoretical Physics and PhD in Solid State Physics "Electron properties of an atomically sharp semiconductor interface"
Alexander Dorodnyy: PhD student, MS in Applied Mathematics and Physics
Nikolay Komarevskiy: PhD student, MSc in Physics of Nanostructures
The topics of interest of our group are Protective coatings, Thermal barrier coatings, High-temperature materials, Photonics, High-temperature photonics, Nanostructures, Energy conversion and storage, Reactivity in solids, Organic/Inorganic materials, Molecular electronics, see Recent publications. We perform conceptualization, chemical and solid-state synthesis and characterization of new functional materials for industrial applications, see Recent projects, Recent presentations. The characterization methods comprise single crystal and powder crystallography, in situ X-ray measurements at high temperature and under controlled atmoshpere, high-resolution scanning and transmission electron microscopy, dilatometry, DTA, measurement of physical properties of crystals, powders and films. Modeling includes heat transport and heat dissipation, band structure and force-field calculations. The group is working very close to the industries, see Recent patents.
N. Komarevskiy, V. Shklover, L. Braginsky, Ch. Hafner, J. Lawson. Potential of glassy carbon and silicon carbide photonic structures as electromagnetic radiation shields for atmospheric re-entry. Optics Express 20 (2012) 14189-14200 pdf
J. Martinez-Garcia, L. Braginsky, V. Shklover, J. W. Lawson. Correlation function approach for estimating thermal conductivity in highly porous fibrous materials. Proceedings of the 9th IASMA / WSEAS International Conference on Fluid Mechanics & Aerodynamics, Florence, Italy, August 23-25. 2011. In Recent Advances in Fluid Mechanics and Heat & Mass Transfer, pp. 78-83 (2011), pdf
J. Martinez-Garcia, L. Braginsky, V. Shklover, J. W. Lawson. Correlation function analysis of fiber networks: implications for thermal conductivity, Physical Review B 84 (2011) 054208, pdf
A. Bhattacharya, V. Shklover, K. Kunze, W. Steurer. Effect of 7YSZ on the long-term stability of YTaO4 doped ZrO2. Journal of the European Ceramic Society 31 (2011) 2897-2901, pdf
N. Komarevskiy, V. Shklover, L. Braginsky, Ch. Hafner, O. Fabrichnaya, S. White, J. Lawson. Design of reflective, photonic shields for atmospheric re-entry. Journal of Electromagnetic Analysis and Applications, 3 (2011) 228-237 pdf
A. Bhattacharya, P. Reinhard, W. Steurer, V. Shklover. Calcia-doped yttria-stabilized zirconia for thermal barrier coatings: synthesis and characterization. Journal of Materials Science 46 (2011) 5709-5714. pdf
L. Castaldi, D. Kurapov, A. Reiter, V. Shklover, J. Patscheider. Tuning the crystallographic and electronic properties of chromium oxynitride films. Journal of Applied Physics 109 (2011) 053720. pdf
N. Komarevskiy, L. Braginsky, V. Shklover, Ch. Hafner, J. Lawson. Fast numerical methods for the design of layered photonic structures with rough interfaces. Optics Express 19 (2011) 5489-5499 pdf
A. K. Bhattacharya, V. Shklover, W. Steurer, G. Witz, H.-P. Bossmann, O. Fabrichnaya. Ta2O5–Y2O3–ZrO2 system: Experimental study and preliminary thermodynamic description. Journal of the European Ceramic Society 31 (2011) 249–257 pdf
A. Todosiciuc, A. Nicorici, T. Gutsul, F. Gramm, L. Braginsky, V. Shklover "Tunable PbTe nanocolloids and nanolayers: HTSP precipitation, spectral properties and light-hole band lowering due to quantization. Journal of Optoelectronics and Advanced Materials 12 (2010) 1720-1728 pdf
L. Braginsky, A. Gusarov, V. Shklover. Models of thermal conductivity of multilayer wear resistant coatings, Surface & Coating Technology 204 (2009) 629-634 pdf
V. Shklover, L. Braginsky, M. Mishrikey, Ch. Hafner. High-Temperature Fiber Matrix Composites for Reduction of Radiation Heat Transfer. In High-Temperature Photonic Structures, Eds. R. Biswas, V. Shklover, S.-Y. Lin, E. Johnson. (Mater. Res. Soc. Symp. Proc. Volume 1162E, Warrendale, PA, 2009), paper 1162-J03-05 pdf
V. Shklover, L. Braginsky, M. Mishrikey, Ch. Hafner. Radiative heat transport in porous materials. In High-Temperature Photonic Structures, Eds. R. Biswas, V. Shklover, S.-Y. Lin, E. Johnson. (Mater. Res. Soc. Symp. Proc. Volume 1162E, Warrendale, PA, 2009), paper 1162-J03-03 pdf
G. Witz, V. Shklover , W. Steurer, S. Bachegowda, H.-P. Bossmann. Monitoring the phase evolution of yttria stabilized zirconia in thermal barrier coatings using the Rietveld method. Progress in Thermal Barrier Coatings, Wiley, July 2009, pp. 259-269 pdf
G. Witz, V. Shklover , W. Steurer, S. Bachegowda, H.-P. Bossmann. Phase evolution in yttria-stabilized zirconia thermal barrier coatings studied by Rietveld refinement of X-ray powder diffraction patterns. Progress in Thermal Barrier Coatings, Wiley, July 2009, pp. 359-364 pdf
V. Shklover, L. Braginsky, G. Witz, M. Mishrikey, Ch. Hafner. High-temperature photonic structures. Thermal barrier coatings, infrared sources and other applications. Journal of Computational and Theoretical Nanoscience, 5 (2008) 862-893 link
L. Braginsky, V. Shklover. Thermal conductivity of low-particle-concentration suspensions: Correlation function approach. Physical Review B 78 (2008) 224205 pdf
L. Castaldi, D. Kurapov, A. Reiter, V. Shklover, P. Schwaller, J. Patscheider. Effect of the oxygen content on the structure, morphology and oxidation resistance of Cr-O-N coatings. Surface & Coating Technology, 203 (2008) 545-549 pdf
A. Nicorici, V. Shklover, A. Todosiciuc. Low temperature X-Ray powder diffraction study of lead
telluride doped with Yb. Journal of Optoelectronics and Advanced Materials, 10 (2008) 860-861. pdf
D. Khokhlov, L. Ryabova, A. Nikorici, V. Shklover, S. Ganichev, S. Danilov, V. Bel'kov. Terahertz photoconductivity of PbSnTe(In). Applied Physics Letters, 93 (2008) 264103 pdf
J. Prochazka, L. Kavan, V. Shklover, M. Zukalova, O. Frank, M. Kalbac, A. Zukal, H. Pelouchova, P. Janda. Multilayer Films from Templated TiO2 and Structural Changes
during their Thermal Treatment. Chemistry of Materials, 20 (2008), 2985-2993 pdf
A. E. Kozhanov, A. V. Nikorich, L. I. Ryabova, D. R. Khokhlov, A. V. Dmitriev, V. Shklover. Photoconductivity of the Pb0.75Sn0.25Te:In Alloy in an Alternating Electric Field. Semiconductors 41 (2007) 663-665 pdf
G. Witz, V. Shklover, W. Steurer, S. Bachegowda, H.-P. Bossmann. Phase evolution in Yttria-Stabilized Zirconia thermal barrier coatings studied by Rietveld refinement of X-ray powder diffraction patterns" Journal of the American Ceramic Society 90 (2007) 2935-2940 pdf
L. Castaldi, D. Kurapov, A. Reiter, V. Shklover, P. Schwaller, J. Patscheider. High temperature phase and oxidation behavior of Cr-Si-N coatings. Surface & Coating Technology, 202 (2007) 781-785 pdf
L. Braginsky, V. Shklover, G. Witz, H.-P. Bossmann. Thermal conductivity of porous structures. Physical Review B, 75 (2007) 094301. pdf
L. Braginsky, V. Shklover. Light propagation in imperfect photonic crystals. 15th International Symposium Nanostructures: Physics and Technology. Novosibirsk, June 25-29, 2007. pdf
L. Braginsky, V. Shklover. Light propagation in an imperfect photonic crystal. Physical Review B 73 (2006) 085107. pdf
A. Artamkin, A. Nikorici, L. Ryabova, V. Shklover, D. Khokhlov. Continuous focal plane arrays for detection of Terahertz radiation. In Infrared Spaceborn Remote Sensing XIV. Ed. by M. Strojnik, Proceedings of SPIE, 6297 (2006) 62970B-1 to 62970B-5. pdf
V. Shklover, H. Hofmann. Methods of self-assembling in fabrication of nanodevices. In Handbook of Semiconductor Nanostructures and nanodevices, Eds. A.A. Balandin and K.L. Wang, American Scientific Publishers, North Lewis Way, California, 2006, Vol. 2, pp. 181-213. pdf
V. Shklover, L. Braginsky. Photonic band gap materials: fabrication, modeling, and applications. Enabling Photonic Technologies for Defense, Security, and Aerospace Applications II. 20-21 April 2006, Kissimmee, Florida, USA, 6243 (2006) 62430Q1-6243Q11. pdf
V. Veselago, L. Braginsky, V. Shklover, Ch. Hafner. Negative refraction index materials. Journal of Computational and Theoretical Nanoscience, 3 (2006) 189-218. pdf
V. Shklover, L. Braginsky, H. Hofmann. Domain structure and optical properties of colloidal photonic crystals. Materials Science and Engineering C, 26 (2006) 142-148. pdf
V. Shklover. Formation of aligned microfiber arrays via self-assembling SiO2 nanocolloids. Change of microstructure during annealing. Chemistry of Materials, 17 (2005) 608-614. pdf
V. Shklover, L. Braginsky. Practical aspects of interaction of real photonic crystal with light. Optics/Photonics in Security & Defense. 26-28 September 2005, Bruges, Belgium, Technologies for Optical Countermeasures II; Femtosecond Phenomena II; and Passive Millimeter-Wave and Terahertz Imaging II, Proceedings of SPIE, 5989 (2005) 298-307. pdf
I. Vjunitsky, E. Schönfeld, T. Kaiser, W. Steurer, V. Shklover. Study of phase states and oxidation of B2-structure based Al–Ni–Ru–M alloys. Intermetallics, 13 (2005) 35-45. pdf
I. Vjunitsky, P.P. Bandyopadhyay, St. Siegmann, M. Dvorak, E. Schönfeld, T. Kaiser, W. Steurer, V. Shklover. Thermophysical properties and deposition of B2 structure based Al–Ni–Ru–M alloys. Surface & Coating Technology, 192 (2005) 131-138. pdf
V. Shklover, L. Braginsky, H. Hofmann. Domain structure and optical properties of thin nanocrystalline films. SPIE Defense and Security Symposium, 28 March-1 April 2005, Orlando, Florida, USA, Enabling Photonic Technologies for Defense, Security, and Aerospace Applications, Proceedings of SPIE, 5814 (2005) 239-247. pdf
L. Braginsky, V. Shklover, H. Hofmann, P. Bowen. High-temperature thermal conductivity of porous Al2O3 nanostructures. Physical Reviews, B70 (2004) 134201. pdf
F. P. Rotzinger, J. M. Kesselman-Truttman, S. J. Hug, V. Shklover, M. Grätzel. Structure and vibrational spectrum of formate and acetate adsorbed from aqueous solution onto the TiO rutile (110) surface. Journal of Physical Chemistry B, 108 (2004) 5004-5017 pdf
A. Shtygashev, Yu. Ovchinnikov, V. Shklover. Simple quantum models of electron injection from a sensitizer molecule to semiconductor nanocrystals. Solar Energy Materials & Solar Cells, 76 (2003) 75-84. pdf
L. Braginsky, N. Lukzen, V. Shklover, H. Hofmann. High-temperature phonon thermal conductivity of nanostructures. Physical Review, B66 (2002) 134203. pdf
Y.V. Zubavichus, Yu.L. Slovokhotov, M.K. Nazeeruddin, S.M. Zakeeruddin, M. Grätzel, V. Shklover. Structural characterization of solar cell prototypes based on nanocrystalline TiO2 anatase sensitized with Ru complexes. X-ray Diffraction, XPS, and XAFS Spectroscopy Study. Chemistry of Materials, 14 (2002) 3556-3563. pdf
V. Shklover, Md.K. Nazeeruddin, M. Grätzel, Yu.E. Ovchinnikov. Packing of ruthenium sensitizer molecules on mostly exposed faces of nanocrystalline TiO2: Crystal structure of (NBu4+)2[Ru(H2tctterpy)(NCS)3]2.0.5DMSO. Applied Organometallic Chemistry, 16 (2002) 635-642. pdf
K. Belaroui, G. Rapillard, P. Bowen, H. Hofmann, V. Shklover. Nanocrystalline coating by electrophoretic depostion (EPD). Key Engineering Materials, 206-213 (2002) 519-522. pdf
B. O’Regan, V. Shklover, M. Grätzel. Electrochemical deposition of smooth and
homogeneously mesoporous ZnO films from propylene carbonate electrolytes. Journal of Electrochemical Society, 148 (2001) C498-C505.
F. Lenzmann, V. Shklover, K. Brooks, M. Grätzel. Mesoporous Nb2O5 films: Influence of degree of crystallinity on properties. Journal of SolGel Science and Technology, 19 (2000) 175-180. pdf
S. Burnside, S. Winkel, K. Brooks, V. Shklover, M. Grätzel, A. Hinsch, R. Kinderman, C. Bradbury, A. Hagfeldt, H. Pettersson. Deposition and characterization of screen-printed porous multi-layer thick films structures from semiconucting and conducting nanomaterials for use in photovoltaic devices. Journal of Materials Science in Electronics, 11 (2000) 355-362 pdf
L. Braginsky, V. Shklover. Light absorption at the interface of transition-metal oxide
semiconductors. Solar Energy Materials & Solar Cells, 64 (2000) 15-27. pdf
J. Meier, S. Dubail, R. Platz, P. Torres, U. Kroll, J.A. Anna Selvan, N. Pellaton Vaucher, Ch. Hof, D. Fischer, H. Keppner, R. Flückiger, A. Shah,
V. Shklover, K.-D. Ufert. Towards high-efficiency thin-film silicon solar cells with the "micromorph" concept. Solar Energy Materials & Solar Cells, 49 (1997) 35-44. pdf
N. Pellaton Vaucher, B. Rech, D. Fischer, S. Dubail, M. Goetz, H. Keppner, N. Wyrsch, C. Beneking, O. Hadjadj, V. Shklover, A. Shah. Controlled nucleation of thin microcrystalline layers for the recombination junction in a-Si stacked cells. Solar Energy Materials & Solar Cells, 49 (1997) 27-33. pdf
Industry Solutions Group has projects with NASA Ames Research Center on design of protection coatings for atmospheric entry:
N. I. Komarevskiy, V. Shklover, L. Braginsky, Ch. Hafner, J. Lawson. "Design of Photonic, Reflective TPS for Re-entry Applications". December 14. 2012. Thermal Protection Branch, NASA Ames Research Center
N. Komarevskiy. "Optimal design of reflection photonic structures for space applications". Scientific Computing in Electrical Engineering, ETH Zürich, September 11-14, 2012. SCC2012 Hosted by ETH Zurich and ABB Corporate Research ABB
N. Komarevskiy, V. Shklover, L. Braginsky, Ch. Hafner, J. Lawson. Design and optimization of photonic shields for atmospheric re-entry. 8th Workshop on Numerical Methods for Optical Nano Structures. ETH Zürich, July 2-3. 2012. Workshop-2012
A. Dorodnyy, Ch. Hafner, V. Shklover. Numerical simulation methods for solar cells. 8th Workshop on Numerical Methods for Optical Nano Structures. ETH Zürich, July 2-3. 2012. Workshop-2012
J. Martinez-Garcia, L. Braginsky, V. Shklover, J. W. Lawson. "Correlation function approach for estimating thermal conductivity in highly porous fibrous materials". Proceedings of the 9th IASMA / WSEAS International Conference on Fluid Mechanics & Aerodynamics, Florence, Italy, August 23-25. 2011.
N. Komarevskiy. "Design of reflecting photonic structures for space applications". 7th Workshop on Numerical methods for Optical Nano structures. July 4 - July 5. 2011, ETH Zurich Workshop-2011
N. Komarevskiy, L. Braginsky, V. Shklover, Ch. Hafner, J. Lawson. "Fast numerical methods for the design of layered photonic structures with rough interfaces". The 27th International Review of Progress in Applied Computational Electromagnetics
March 27th-31st, 2011 in Williamsburg, Virginia. 2011 ACES Conference
J. Martinez-Garcia, L. Braginsky, J. Lawson, V. Shklover "Thermal conductivity of porous micro- and nanostructures. Correlation function approach". Interpore2011, 3rd International Conference on Porous Media, Bordeaux, March 29-31, 2011 Interpore2011
A. Bhattacharya and V. Shklover "New developments in thermal barrier coatings". Turbine Forum 2010, Advanced Coatings For High Temperatures, September 22-24, 2010, Nice - Port St. Laurent, France Turbine Forum 2010
N. Komarevsky, V. Shklover, L. Braginsky, Ch. Hafner "Optimal design of an omnidirectional reflecting photonic systems for reentry applications", 6th Workshop on Numerical Methods for Optical Nano Structures, July 5. - July 7. 2010, ETH Zürich Workshop Presentation
N. Komarevsky, V. Shklover, L. Braginsky, Ch. Hafner "Optimal design of an omnidirectional reflecting photonic system operating in two broad energy bands", Joint graduate student/ postdoc exchange between optETH, MIT and Harvard University, Boston, June 9-12. 2010. MIT-ETH
L. Castaldi, D. Kurapov, A. Reiter, V. Shklover, P. Schwaller, J. Patscheider. "High oxidation resistance and phase stability of Cr-Si-O-N coatings". The 37th International Conference On Metallurgical Coatings & Thin Films, April 26-30, 2010, San Diego, California ICMCTF2010
V. Shklover "Thermally protective coatings for industrial applications". February 5. 2010, NASA Ames Research Center
A. K. Bhattacharya, O. Fabrichnaya, W. Steurer, G. Witz, H-P Bossmann, V. Shklover "Ta-doped YSZ for thermal barrier coatings". The 34th International Conference & Exposition on Advanced Ceramics & Composites (ICACC), January 24-29. 2010, Daytona Beach, Florida ICACC
L. Braginsky, A. Gusarov, V. Shklover "Models of thermal conductivity of multilayer coatings for cutting applications". The 36th International Conference on Metallurgical Coatings and Thin Films, April 27. - May 1. 2009, San Diego, California ICMCTF2009
V. Shklover, L. Braginsky, M. Mishrikey, Ch. Hafner "High-temperature fiber matrix composites for reduction of radiation heat transfer". 2009 MRS Spring Meeting. April 13-17. 2009, San Francisco, MRS2009
L. Braginsky, V. Shklover, M. Mishrikey, Ch. Hafner "Radiation heat transfer in porous materials". 2009 MRS Spring Meeting. April 13-17. 2009, San Francisco, MRS2009
L. Braginsky, V. Shklover "High-temperature protective photonic coatings". Ultra-High Temperature Ceramics: Materials for Extreme Environment Applications. August 3-8. 2008, Granlibakken Conference Center, Lake Tahoe, California, Lake Tahoe
L. Castaldi, D. Kurapov, A. Reiter, V. Shklover, P. Schwaller, J. Patscheider "Effect of oxygen content on the structure, morphology and oxidation resistance of Cr-O-N coatings". The International Conference on Metallurgical Coatings and Thin Films ICMCTF 2008, April 28. - May 2. 2008, San Diego, California, USA, ICMCTF 2008
L. Braginsky, G. Witz, V. Shklover, H.-P. Bossmann "Structure effects on thermal conductivity of nano-media". Nanofluids: Fundamentals and Applications, Copper Mountains Resort, Colorado, September 16-20, 2007 Nanofluids
V. Shklover "Photonic materials: fabrication, modeling, and applications" Structural methods in chemistry, biology and medicine (Workshop in memory of Prof. Yuri Struchkov), Chicago, August 10-13, 2007 Chicago
L. Braginsky, G. Witz, V. Shklover "High-temperature thermal conductivity of porous micro- and nanostructures", Thermal Barrier Coatings II, August 12-17, 2007, Kloster Irsee, Germany Thermal Barrier Coatings II
L. Castaldi, V. Shklover, P. Schwaller, J. Patscheider "Effect of Si content on the structural, morphological and mechanical properties of Cr-Si-N coatings prepared by unbalanced magnetron sputtering", The E-MRS 2007 Spring Meeting, May 28 - June 1, 2007, Strasbourg, France, E-MRS 2007 Spring Meeting
L. Castaldi, D. Kurapov, A. Reiter, V. Shklover, P. Schwaller, J. Patscheider "High temperature phase changes and oxidation behaviour of Cr-Si-N coatings" The International Conference on Metallurgical Coatings and Thin Films ICMCTF 2007, April 23-27, 2007, San Diego, California, USA, ICMCTF 2007
G. Witz, V. Shklover, W. Steurer, S. Bachegowda, H.-P. Bossmann "Control of polymorphic composition of yttria stabilzied zirconia using Rietveld method" 31st International Cocoa Beach Conference & Exposition on Advanced Ceramics & Composites, January 21-26, 2007, Daytona Beach, Florida, USA Cocoa Beach
V. Shklover and T. Kaiser "Study of B2 structure based AlNiRuM alloys for possible applications in protective coatings" (Invited lecture), "Advanced Coatings for High Temperatures", Turbine Forum 2006, April 26-28, 2006, Nice, France, Turbine Forum 2006
V. Shklover and L. Braginsky "Photonic crystals: fabrication, modeling, and applications" Enabling Photonic Technologies for Defense, Security, and Aerospace Applications II", Defense & Security Symposium SPIE, April 17-21, 2006, Orlando, Florida, USA, SPIE
WE ARE LOOKING FOR:
Studierenden/eine Studierende für zwei Monate (Juli – August 2012) für eine Sommerarbeit
Abstract. Die Tätigkeit beinhaltet den Aufbau einer Datenbank für ein Technologie-orientiertes ETH-Projekt im Bereich Physik und Chemie der Metallbearbeitung und Schutzschichten.
FileMaker wird als Database Software benützt. Die Datenbank soll Publikationen und Patente beinhalten, die nach Kategorien und Stichworten durchsuchbar sind. Der Studierende/die Studierende wird seinen/ihren Arbeitsplatz an der ETH Hönggerberg haben. Die Infrastruktur wird ebenfalls zur Verfügung gestellt.
Der Studierende/die Studierende soll an der ETH Zürich oder der EPFL immatrikuliert sein und einen Ausbildungsstand haben, der mindestens der abgeschlossenen Basisprüfung (Bachelor) entspricht.
Für weiter Auskünfte steht Ihnen Herr Dr. Valery Shklover, Tel. 044 632 37 75, email@example.com, gerne zur Verfügung.
Position 1 (bachelor or master work)
Untersuchung von Schutzschichten mit spezieller thermischer Leitfähigkeit auf Wendeplatten zum Drehen
Bei der mechanischen Bearbeitung von schwer zerspanbaren Werkstoffen können die Beschichtungen auf den Schneidstoffen eine entscheidende Rolle spielen. Neben der Zähigkeit und Abrasionsbeständigkeit wichtig ist auch das thermische Verhalten der Schutzschicht auf der Schneide. Da es bei einem kontinuierlichen Schnitt wie beim Drehen unmöglich ist das Kühlschmiermittel zwischen Span und Schneide einzubringen, wäre es wünschenswert, wenn die Wärme über die Schutzschicht neben den Schneidbereich transportiert und dort über das Kühlschmiermittel abgeführt werden könnte. Gleichzeitig ist es wünschenswert, wenn die Schutzschicht auf der Schneide eine geringen Reibungskoeffizient aufweist, und somit der Span gut über die Spanfläche und die Werkstückoberfläche über die Freifläche gleiten könnten.
Erfahrung mit gesteuerten Werkzeugmaschinen oder in Messtechnik von Vorteil
Dr. Valery Shklover, firstname.lastname@example.org, phone + 41 44 632 37 75
Position 2 (bachelor and/or master thesis students)
Application of random resistor model to calculation of thermal conductivity of high-temperature stable fiber structures
The project is part of studies on highly porous thermally protective systems for space applications. The extension of iterative KH solver* for heat-flow simulation in 2D fiber arrays, written at our group recently, to 3D case. Input data: temperature gradient, system size, fiber conductivity, fiber square area, structure (can be generated by KywFiberFile code), thermal conductivity of individual fibers. Output data: phonon thermal conductivity of fiber array, heat flow through the whole system, local heat flows, equilibrium temperatures at all crossing points. Open question: can random resistor model be helpful also for simulation of radiation thermal conductivity? The graphical model for presentation simulation results has to be written.
Background in material science and in thermodynamics. Programming skill in using Mathematica, MATLAB, Code Blocks (C++ IDE).
Mechanical and Process Engineering, Materials Science, Physics, Chemistry
Dr. Valery Shklover, email@example.com, phone + 41 44 632 3775
Position 3 (post-doc)
Theoretical approach to optimization of effective properties of partially ordered fiber thermal protection systems
This project is aimed at the development of a new approach to determine the critical physical properties of ablative thermal protection systems (ATPS) for protection of space vehicles during atmospheric re-entry. This new approach will be based on using information about the microstructure of ATPS. The modeling of critical properties of ATPS will be based on the correlation function (CF) approach using digital images of 2D cross-sections of the 3D structure. The following ATPS properties will be modeled: porosity, density, ablation efficiency, fluid (gas) permeability, phonon thermal conductivity, dielectric permittivity, radiation thermal conductivity, elasticity, Young’s modulus. The study and modeling of porosity is very important for ATPS because high porosity reduces the weight (and therefore cost) of the ATPS but, on the other hand, can reduce strength. Low density will reduce weight, but may also reduce strength. Permeability is a critical property of ATPS because pyrolysis gases, which are generated internally during operation, must be released or they may cause large catastrophic pressure build up. Released gases also remove heat via convection mechanism. Thermal conductivity is very important property. It is desirable to radiate heat localized at the vehicle surface and prevent this heat from penetrating into the material and towards the vehicle. Monitoring dielectric permittivity is crucial because we would like to reflect (and not absorb) radiation generated in the shock layer during reentry. Elastic moduli and other mechanical properties are important to help prevent catastrophic mechanical failures during operation. Project duration 12 months, start in June/July 2010, project continuation is possible.
Knowledge in conduction heat transfer, radiative heat transfer, fundamentals of material properties, numerical methods, programming. Desirable knowledge in mass transfer, relations for transfer in absorbing, emitting, scattering media.
Dr. V. Shklover (Industry Solutions Group, Laboratory of Crystallography, Department of Materials, ETH Zürich, Switzerland)
Position 4 (PhD student)
Title of PhD work: High-temperature photonic structures
In this project, we propose to develop and apply a software package for the analysis and optimal design of high-temperature photonic structures (HTPS). This software will consist of four essential components: a code that derives a simplified model, a code that efficiently computes the electromagnetic properties of the simplified model over a broad frequency range, a numerical optimizer that searches for a simplified model with minimum heat transfer through the structure, and a code that steers the fabrication process in such a way that a coating is obtained that should have similar properties as the optimal simplified model. The optimization process will take all important fabrication constraints into account. The relations between different ideal and synthesized photonic structures, expected band gap structures, and photonic reflectivity spectra will be studied. The special emphasis will be on the methods of enabling new HTPS with omnidirectional properties. This question will be studied first theoretically, and then the necessary structures will be simulated and manufactured. By proper choice and optimal steering of the fabrication process, we expect that the quality of the coating in terms of heat transfer can be considerably improved. One then may reduce the width of the coating, which reduces its weight, with obvious advantages for turbines and especially for spacecrafts. The efficiency of the manufactured test coatings will be checked experimentally. The project will be done in tight collaboration with experts in fabrication of HTPS structures, who will manufacture and characterize the most promising structures obtained from the software developed in this project. Experimental studies of optical properties at room at high temperatures and high-temperature stability of test materials will be performed by the Industry Solutions Group of the Laboratory of Crystallography of the Department of Materials of ETHZ. We expect that our HTPS design software will become highly valuable not only for scientists working on photonics and high temperature coatings, but also for industry.
Electromagnetics and optics including numerical methods for these topics. Experience in numerical optimization and programming would be helpful as well. Experimental skills in optical measurements.
Prof. Ch. Hafner (Laboratory of Electromagnetic Fields and Microwave Electronics, ETH Zürich, Switzerland),
Dr. V. Shklover (Industry Solutions Group, Laboratory of Crystallography, Department of Materials, ETH Zürich, Switzerland)
Contact: Dr. Valery Shklover, firstname.lastname@example.org, phone + 41 44 632 3775
Position 5 (bachelor and/or master thesis students)
Title: Protection coatings for new generation gas turbines
The industry-sponsored project is targeted at the design of a new generation of thermal barrier coatings capable of sustaining the operation of gas turbines at surface temperatures up to 1400 ˚C. This will promote the development of more efficient, ecologically clean and more competitive gas turbines. Different types of coating systems will be designed: chemically modified yttria-stabilized zirconia (YSZ), morphologically modified graded YSZ, and overlay-type coatings. The project is divided into three phases: materials selection and modeling, coatings design and development, coatings testing and validation.
The coatings types, available in the scientific literature and patent data, will be evaluated after set of properties important for their applications as protective coatings. The revealed trends will be applied in synthesis of new coating materials possessing the set of important properties. The set of important properties include high-temperature stability, thermal conductivity, thermal expansion, thermodynamic compatibility with turbine blade components.
Requirements: Electromagnetics and optics including numerical methods for these topics. Experience in numerical optimization and programming would be helpful as well. Experimental skills in optical measurements.
Accepted students: Materials Science, Physics, Chemistry
Contact: Dr. Valery Shklover, email@example.com, phone + 41 44 632 3775
Position 6 (bachelor and/or master thesis students)
Title: Synthesis and Characterization of advanced oxides for thermal barrier coatings
Mixed oxides based on YSZ (Yttria stabilised Zirconia) are prime candidates for thermal barrier coatings in gas turbine engines, however, YSZ can be applied to a maximum temperature of 1200 C. To increase the working temperature, some other transition metal oxides has to be doped into YSZ system. In this project MOx(Refractory oxides) will be doped into YSZ by reverse coprecipitation technique. Oxides obtained will be characterized by WDS (Wavelength Dispersive Spectroscopy) and in-situ XRD (X-ray Diffraction) for their chemical composition correctness. High temperature (in-situ and ex-situ) XRD will be applied to study their phase stability at temperatures higher than 1200 C. To ensure thermal compatibility of the developed coatings, thermal expansion and sinterability test will also be done.
1. Synthesis of mixed oxides by chemical route( reverse co-precipitation)
2. analytical characterisation (WDS/XRD) to confirm the chemical composition of the obtained oxides.
3. phase characterisation and solid state chemistry studies by applying high temperature In-Situ and
ex-situ XRD on the developed oxide coatings.
1. Masters/Bachelors students from Chemistry or Material Science.
2. Knowledge of Synthesis is a plus but not obligatory.
Contact: Dr. Valery Shklover, firstname.lastname@example.org, phone + 41 44 632 3775
K. E. Schneider, V. Belashchenko, M. Dratwinsky, S, Siegmann, A. Zagorski "Thermal spraying for power generation components" 2006 Wiley-VCH Verlag GmbH. Review
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