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نمایش نتایج: از شماره 61 تا 70 , از مجموع 139

موضوع: موقعیت‌های خالی در دانشگاه‌های خارج از کشور

  1. #61
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    پیش فرض پاسخ : موقعیت‌های خالی در دانشگاه‌های خارج از کشور

    Non-photochemical routes to diazahelicenes


    50000403v1538

    Promoter: Wim Dehaen

    details
    Description: Helicenes containing nitrogen heteroatoms will be prepared by constructing bicyclic and tricyclic building blocks, connecting them and carrying out a cyclisation or cycloaddition by non- photochemical ways.
    Thus, racemic helicene compounds are obtained that can be resolved by using the formation of diastereoisomers, chiral (HPLC) chromatography, or crystallisation techniques. Another alternative is the enantioselective helicene formation.
    The helicenes will be substituted with functions that will allow to study the NLO properties together with the research team of Prof. Dr. Koen Clays (GOA-project). Other applications are enantioselective catalysis.
    There is a material relevance, but basically this is a study of synthetic methodology.

    Remark : please only apply if you are eligible for the Erasmus Mundus External Cooperation Window

    Key words: synthetic methodology heterocyclic chemistry helicenes chirality cyclisation reactions

    Latest application date: 2010-05-01

    Financing: Erasmus Mundus External Cooperation Window

    Type of Position: scholarship

    Source of Funding: EMECW

    Duration of the Project : 4 years

    Research group: Department of Chemistry

    http://phd.kuleuven.be/apply/index.p...id=1538&titel=
    روزگار است، آنكه گه عزت دهد گه خوار دارد. چرخ بازيگر از اين بازيچه ها بسيار دارد. "قائم مقام فراهانی"

  2. #62
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    پیش فرض پاسخ : موقعیت‌های خالی در دانشگاه‌های خارج از کشور

    Synthesis of new fluorescent materials


    50000403v1688

    Promoter: Wim Dehaen

    details
    Description: The use of fluorescent molecules in new materials is receiving increasing attention in the scientific literature. They are currently used in several organic materials such as LED’s, lasing materials and photonic devices.
    4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (commercialized as BODIPY®) is currently one of the most studied fluorescent molecules. The compound can be prepared from selected pyrroles in a few steps. It can be excited with visible light, emits strongly with high quantum yields and narrow bands and shows relatively high molar extinction coefficients.

    In recent years our group found and reported several methods of substituting the BODIPY core. We are currently trying to expand these methods towards applications in the field of new molecular materials, sensors and long wavelength emitting dyes. This project concerns the synthesis, characterisation and application of BODIPY’s in new materials.

    The project starts with the synthesis of new BODIPY dyes. In this synthesis we aim for compounds that absorb and emit in the red, as this is highly interesting for use of infrared light. Shifting the fluorescence of a compound to the red is generally done by introducing extended conjugation. A few new synthetic routes towards these interesting molecules will be tested along the way.

    Once the desired compounds are obtained, we will substitute the dyes selectively towards application in new materials. Some of the most interesting applications are polymerisation of fluorescent sensors, introduction on nano-particles and design of new photonic devices.
    Measurement and characterisation of the novel materials will be done in cooperation with several other groups.

    Key words: BODIPY, fluorescence, biosensors, materials, organic synthesis

    Latest application date: 2010-05-01

    Financing: Erasmus Mundus External Cooperation Window

    Type of Position: scholarship

    Source of Funding: CSC

    Duration of the Project : 3-4 years

    Research group: Department of Chemistry

    http://phd.kuleuven.be/apply/index.p...id=1688&titel=
    روزگار است، آنكه گه عزت دهد گه خوار دارد. چرخ بازيگر از اين بازيچه ها بسيار دارد. "قائم مقام فراهانی"

  3. #63
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    پیش فرض پاسخ : موقعیت‌های خالی در دانشگاه‌های خارج از کشور

    Synthesis and characterization of sulfonated hyperbranched poly(arylene oxindole) for hydrolysis of cellulose


    50000403v1837

    Promoter: Wim Dehaen, Bert Sels and Mario Smet

    details
    Description: Acidic hydrolysis of cellulose is an attractive route to produce glucose in a sustainable way without direct competition with food supply. However, due to its crystalline structure, cellulose is highly resistant to hydrolysis, usually resulting in a slow process and many side products.

    Highly branched polymers have numerous terminal groups which can easily be interconverted. They usually display a higher solubility than their linear counterparts and hence are excellent candidates for homogeneous catalysis if catalytic groups are introduced at the well exposed terminal groups on the hyperbranched polymer surface. Additionally, for the hydrolysis of cellulose, a good adsorption of the catalyst to the insoluble cellulose particles is likely to be crucial for efficient conversion.

    Therefore, the hyperbranched poly(arylene oxindole)s recently developed in our group, are expected to have excellent characteristics for the development of highly efficient cellulose hydrolysis catalysts. They are relatively easily synthesized, can readily be decorated with numerous catalytically active terminal groups (such as sulfonic acid groups) and can additionally be functionalized with chemical groups specially intended to improve the adsorption to the cellulose particles. Moreover, they are perfectly stable under the expected reaction conditions (pH = ~0, ~150 °C).
    The synthesis is accomplished by acid catalyzed polycondensation of A3 monomer and commercially available isatin as the B2 monomer. The polymer thus obtained will be sulfonated, resulting in a tuneable number of sulfonic acid groups. It is anticipated that the local concentration of sulfonic acid groups combined with the amide groups, which are able to bind to the cellulose via hydrogen bonding, will result in high hydrolytic acitivity, with minimal by-products formed due to the moderate acidity of the aromatic sulfonic acid groups and the buffer effect of the amide groups.
    Crucial molecular characteristics will be varied in order to evaluate their effect on the catalytic activity, such as the molar mass and the number of sulfonic acid groups present. Moreover, linear analogues will be prepared and evaluated in order to assess the influence of the densely branched topology. Analogues containing additional amide groups will be synthesized using triamide as the A3 monomer. This will provide insight in the anticipated role of the amide groups as adsorbing entities. Finally, These hyperbranched molecules can readily be crosslinked, resulting in insoluble network particles. The catalytic activity of the latter will be evaluated as well, as they allow easy removal from the reaction mixture and hence facilitate the recycling of the catalyst.


    Key words: organic synthesis, hyperbranched polymers, cellulose hydrolysis, sustainable chemistry

    Latest application date: 2010-07-01

    Financing: dbof-scholarship

    Type of Position: scholarship

    Source of Funding: DBOF

    Duration of the Project : 4 years

    Research group: Department of Chemistry

    http://phd.kuleuven.be/apply/index.p...id=1837&titel=
    روزگار است، آنكه گه عزت دهد گه خوار دارد. چرخ بازيگر از اين بازيچه ها بسيار دارد. "قائم مقام فراهانی"

  4. #64
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    پیش فرض پاسخ : موقعیت‌های خالی در دانشگاه‌های خارج از کشور

    Synthesis and photodynamic properties of conjugated acyclic and cyclic pyrrole-containing compounds


    50000403v1838

    Promoter: Wim Dehaen

    details
    Description: Corroles, contracted porphyrin analogues lacking one meso-carbon atom, have been rather rare macrocyclic compounds for a long time due to their challenging synthesis. Novel one-step synthetic methods towards (more stable) meso-triarylcorroles and the discovery that corroles can stabilize unusually high metal oxidation states have, however, given a new impulse to corrole chemistry.
    Within our group, a lot of research was carried out recently on the synthesis of acyclic and cyclic oligopyrroles, including dipyrromethenes, porphyrins, corroles, hexaphyrins, and calixphyrins. We have recently developed an efficient synthetic route towards meso-pyrimidinyl substituted A2B-corroles, which uses a [2+1]-condensation of aryldipyrromethanes and 4,6-dichloropyrimidine-5-carbaldehydes. Besides the high yields for the corrole synthesis, the main advantage of the presented meso-pyrimidinylcorroles is the high reactivity of the chlorine groups towards functionalization. Different substitution reactions, e.g., nucleophilic aromatic substitution (SNAr) and metal-catalyzed cross-coupling reactions (Suzuki, Stille, Liebeskind), have successfully been explored at the corrole stage. Using these reactions, it is possible to construct sophisticated functional corroles and multichromophoric systems, suitable for a variety of corrole applications, e.g., (asymmetric) catalysis, molecular electronics, and photodynamic therapy (PDT).
    Corroles are chromophores (usually purple colored) with distinct absorption bands in the visible region and an intense (orange-red) fluorescence. Due to their high affinity for tumors, they are particularly attractive as active components for fluorescence diagnosis (photodetection) and treatment (PDT) of various cancer types. PDT is a modern medical treatment that uses a drug, called a photosensitizer, and a particular type of light. When photosensitizers are exposed to a specific wavelength of light, they produce highly reactive singlet oxygen (1O2) that kills nearby (tumor) cells. In order to be able to apply a photosensitizer in vivo, it should be sufficiently soluble in living tissue and body fluids.
    In this project we will focus on the synthesis of amphiphilic corroles as potential photosensitizers. Using SNAr and Pd-catalyzed cross-coupling reactions as done before for related pyrimidine-containing systems, diverse polar functional groups will be introduced on the chloro substituted pyrimidinylcorroles that were prepared earlier. The amount of pyrimidinyl groups may vary from 1 to 3 in this case. We will also prepare and functionalize the corresponding porphyrins and BODIPYs (boron-chelated dipyrromethenes) and compare their properties with the functionalized corroles. All compounds prepared will be fully characterized by NMR, UV and fluorescence, FTIR, and MS spectroscopies.
    A selection of recent, earlier related work in the laboratory of organic synthesis in Leuven

    S. A. Chavan, W. Maes, L. E. M. Gevers, J. Wahlen, I. F. J. Vankelecom, P. A. Jacobs, W. Dehaen, D. E. Devos, “Porphyrin-functionalized dendrimers : synthesis and application as recycable photocatalysts in a nanofiltration membrane reactor”, Chem. Eur. J. 2005, 6754-6762.

    T. Rohand, M. Baruah, W Qin, N. Boens, W. Dehaen, “Functionalisation of fluorescent BODIPY dyes by nucleophilic substitution”, Chem. Commun. 2006, 266-268.


    W. Maes, T. N. Ngo, J. Vanderhaeghen, W. Dehaen, “Meso-pyrimidinyl- substituted A2B-corroles”, Org. Lett. 2007, 9, 3165-3168.

    W. Qin, T. Rohand, W. Dehaen, J. N. Clifford, K. Driesen, D. Beljonne, B. Van Averbeke, M. Van der Auweraer, N. Boens, “Borondipyrromethene analogs with phenyl, styryl, and ethynylphenyl substituents: synthesis, photophysics, electro-chemistry, and quantum-chemical calculations”, J. Phys. Chem(A)., 2007, 111, 8588-8597.

    T. Rohand, J. Lycoops, S. Smout, E. Braeken, M. Sliwa, M. Van der Auweraer, W. Dehaen, W. M. De Borggraeve, N. Boens, “Photophysics of 3,5-diphenoxy substituted BODIPY dyes in solution”, Photochem. Photobiol. Sci. 2007, 6, 1061-1066

    I. Szymanska, C. Orlewska, D. Janssen, W. Dehaen, H. Radecka, “Dipyrromethene-dodecanethiol self assembled monolayers deposited on gold electrodes”, Electrochim. Acta, 2008, 53, 7932-7940.
    B. Saraswathyamma, M. Pajak, J. Radecki, W. Maes, W. Dehaen, G. Kumar, H. Radecka, „PVC supported liquid membrane and carbon paste potentiometric sensors incorporating Mn (III) porphyrin for direct determination of undissociated paracetamol”, Electroanalysis, 2008, 20, 2009-2015.

    I. Szymanska, M. Stobiecka, C. Orlewska, T. Rohand, D. Janssen, W. Dehaen, H. Radecka, „Electroactive dipyrromethene-Cu(II) self assembled monolayers-complexation reaction on the surface of gold electrodes”, Langmuir, 2008, 24, 11239-11245.
    B. Saraswathyamma, I. Grzybowska, C. Orlewska, J. Radecki, W. Dehaen, K. G. Kumar, H. Radecka, „Electroactive dipyrromethene-Cu(II) monolayers deposited onto gold electrodes for voltammetric determination of paracetamol”, Electroanalysis, 2008, 20, 2317-2323.

    W. Qin, V. Leen, T. Rohand, W. Dehaen, P. Dedecker, M. Van der Auweraer, K. Robeyns, L. Van Meervelt, D. Beljonne, B. Van Averbeke, J. N. Clifford, K. Driesen, K. Binnemans, N. Boens, „Synthesis, spectroscopy, crystal structure, electrochemistry, and quantum chemical and molecular dynamics calculations of a 3-anilino difluoroboron dipyrromethene dye” J. Phys. Chem., 2009, 113, 439-447.

    T. H. Ngo, W. Van Rossom, W. Dehaen en W. Maes, „Reductive demetallation of Cu-corroles- a new protective strategy towards functional free-base corroles”, Org. Biomol. Chem. 2009, 439-443.

    V. Leen, E. Braeken, K. Luckermans, C. Jackers, M. Van der Auweraer, N. Boens, W. Dehaen, “A versatile, modular synthesis of monofunctionalized BODIPY dyes”, Chem. Commun. 2009, 4515-4517.

    W. Qin, V. Leen, W. Dehaen, J. Cui, C. Xu, X.Tang, W. Liu, T. Rohand, D. Beljonne, B. Van Averbeke, J. N. Clifford, K. Driesen, K. Binnemans, M. Van der Auweraer, N. Boens, “3,5-Dianilino Substituted Difluoroboron Dipyrromethene: Synthesis, Spectroscopy, Photophysics, Crystal Structure, Electrochemistry, and Quantum-Chemical Calculations”., J. Phys. Chem. C 2009, 113, 11731-11740.

    E. Fron, E. Coutino-Gonzalez, L. Pandey, M. Sliwa, M. Van der Auweraer, F. C. De Schryver, J. Thomas, Z. Dong, V. Leen, M. Smet, W. Dehaen, T. Vosch, “Synthesis and photophysical characterisation of chalcogen substituted BODIPY dyes”, New J. Chem. 2009, 33, 1490-1496.

    K. Kurzatkowska, E. Dolusic, W. Dehaen, K. Sieron-Stoltny, A. Sieron, H. Radecka, “Gold Electrode Incorporating Corrole as an on-channel mimetic for determination of Dopamine” Anal. Chem. 2009, 81,7397-7405.
    I. Szymanska, E. Dolusic, W. Dehaen, W. Maes, T. Ito and H. Radecka, Determination of interaction strength between corrole and phenol derivatives in aqueous media using atomic force microscopy”, Supramol. Chem. 2009, 21, 555-563.
    W. Maes, W. Dehaen “Synthetic aspects of porphyrin dendrimers”, Eur. J. Org. Chem., 2009, 4719-4752.

    V. Leen, F. Schevenels, J. Cui, C. Xu, W. Yang, X. Tang, W. Liu, W. Qin, W. M. De Borggraeve, N. Boens, W. Dehaen, “Synthesis and substitution of 8-(4,6-dichloropyrimidin-5-yl)BODIPY” Eur. J. Org. Chem., 2009, 5920-5926.

    T. H. Ngo, F. Nastasi, F. Puntoriero, S. Campagna, W. Dehaen, W. Maes, "Meso-pyrimidinyl-Substituted A2B- and A3-Corroles", J. Org. Chem., accepted


    Key words: Corroles, oligopyrroles, ligands, photodynamic therapy

    Latest application date: 2010-05-17

    Financing: Erasmus Mundus External Cooperation Window

    Type of Position: scholarship

    Source of Funding: EMECW

    Duration of the Project : 3-4 years

    Research group: Department of Chemistry

    Remarks: Take deadlines of EMECW funding system into account

    http://phd.kuleuven.be/apply/index.p...id=1838&titel=
    روزگار است، آنكه گه عزت دهد گه خوار دارد. چرخ بازيگر از اين بازيچه ها بسيار دارد. "قائم مقام فراهانی"

  5. #65
    Junior Member ahmadpeik آواتار ها
    تاریخ عضویت
    Dec 2008
    رشته و دانشگاه
    Mechanical Engineering, McGill University
    ارسال‌ها
    83

    Lightbulb پاسخ : موقعیت‌های خالی در دانشگاه‌های خارج از کشور





    PhD Position on Thermoelectric Materials Development


    Empa is an interdisciplinary research and services institution for material sciences and technology development within the ETH Domain.
    The Laboratory of Solid State Chemistry at Empa is developing perovskite-type compounds and nanostructured composites for potential applications as functional materials in renewable energy- and environmental technologies. Applied methods are chimie douce techniques for nanostructured materials production, XRD, ND, EXAFS and TEM for the structural characterisation of new materials. XRF, ICP-OES, TGA with coupled mass spectrometry and TEM, SEM/EDX for the chemical and morphological characterisation.



    For our MaNEP (www.manep.ch) project on “Thermoelectricity” we offer a


    PhD Position on Thermoelectric Materials DevelopmentEmpa
    Sascha Dr. Populoh
    Solid State Chemistry
    and Catalysis
    Ueberlandstrasse 129
    CH-8600 Dübendorf
    Switzerland
    www.empa.ch/abt131 The position is immediately available for a candidate (m/f) with a masters or diploma degree in Chemistry, Physics or Materials Sciences (or related).


    The project is focussed on the development of novel thermoelectric perovskite-type oxide materials, characterisation techniques of thermoelectric materials and the development of thermoelectric devices for high temperature applications.


    The ideal candidate is a communicative scientist with a strong background in chemistry and/or physical sciences .He/she has experience on the synthesis of inorganic solids and their characterisation. Experience with thermoelectrics would be beneficial.

    For further information please contact Dr. Sascha Populoh sascha.populoh@empa.ch or Dr. Anke Weidenkaff anke.weidenkaff@empa.ch.



    Please send your application with CV, your research interests, a list of publications and the names of two academic referees.
    Please submit your application by e-mail to:
    sascha.populoh@empa.ch

    If there is a will, there is a way

  6. #66
    Junior Member ahmadpeik آواتار ها
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    رشته و دانشگاه
    Mechanical Engineering, McGill University
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    Cool پاسخ : موقعیت‌های خالی در دانشگاه‌های خارج از کشور


    Empa is an interdisciplinary research and services institution for material sciences and technology development within the ETH Domain.
    The laboratory for nanotech@surfaces is mainly dealing with the growth of nanoscale structures by self-assembly and their structural and electronic characterization by scanning tunneling microscopy (STM). In order to strengthen our team we offer a


    PhD position in the nanoscale characterization of self-assembled supramolecular structures


    Empa
    Prof. Dr. Roman Fasel
    nanotech@surfaces laboratories
    Ueberlandstrasse 129
    8600 Dübendorf
    Switzerland


    www.empa.ch/abt127 The work will focus on the experimental characterization of single molecules and supramolecular assemblies adsorbed on nano-structured template surfaces. Structural and electronic properties of the adsorbed assemblies will be controlled by exploring site-specific molecule-substrate interactions and various types of intermolecular interactions. This goal will be pursued using various surface-analytical tools such as XPS, UPS, XPD, LEED and TDS with a strong emphasis on STM.

    The ideal candidate is a communicative physicist or chemist having experience in the field of scanning probe methods, vacuum and solution-based deposition of organic molecules and the preparation of atomically clean surfaces.



    The position is immediately available with a planned duration of 3 years.



    Please send your application including a short statement of research interests, CV, list of publications and names and addresses of two academic references.
    Please submit your application by e-mail to:
    openpositions127@empa.ch
    If there is a will, there is a way

  7. #67
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    پیش فرض پاسخ : موقعیت‌های خالی در دانشگاه‌های خارج از کشور

    PhD student position in Physical Chemistry


    Reference number 2010/53

    Application deadline 2010-04-12
    The PhD student position will be placed at the Department of Chemical and Biological Engineering, Division of Physical Chemistry. The division is pursuing research in biophysical chemistry, optical spectroscopy, electrophoresis, and energy/electron transfer reactions. The projects are chosen to fulfill the requirements of the highest scientific standard, and the know-how they create on a molecular level is generally of importance for solving many advanced problems as well as for future practical applications. The span of potential applications is extremely wide: from life sciences to materials sciences.

    Job description
    The position involves the design and characterization of novel photochromic (supra)molecules. Photochromic molecules can be isomerized between two forms using light. Upon isomerization, a large number of molecular properties change dramatically, such as the structure, charge distribution, refractive index, excitation energies, and redox properties. In this project, the main objective will be to use the photochromic activity for the “on-off” switching of energy- and electron transfer reactions. The systems that will be studied aim at the realization of photoswitched DNA-based opto-fibers, photochromic white-light generation and color tuning, molecular logic devices (memories, logic gates etc.), and photonic control of supramolecular complex-formation.
    The techniques that will be used are mainly UV/vis absorption and emission spectroscopy in the steady-state and the time-resolved regimes.
    The position is limited to maximum five years, which corresponds to full-time research studies during four years. In addition, teaching in the undergraduate or masters curricula at Chalmers could be included corresponding to one year, teaching work distributed over the whole time of the position.

    Required qualifications
    A suitable background is a M.Sc. in Chemistry, Chemical Engineering, Biochemistry, Biotechnology, Physics, or an equivalent education.
    You are expected to work relatively independently, have ability to plan and organize your work, and be able to communicate your scientific results, both orally and in writing, in English.
    Application procedure


    The application shall be written in English and include the following items:
    1. An application of a maximum of one A4 page containing your specific qualifications for the position
    2. Attested copies of education certificates, including grade reports and other documents
    3. Curriculum Vitae
    4. Letters of recommendation and name of reference persons (optional)
    The application shall be sent electronically as pdf or zipped documents. Please use the button at the foot of the page to reach the application form.


    If any material is not available electronically or cannot be transferred to pdf format, the material can be sent as a hard copy to Registrar. The applicants name and the reference number (2010/53) must be written on the first page of the application.
    Address:
    Registrar
    Chalmers University of Technology
    SE-412 96 Göteborg
    Sweden
    Further information
    For further information, please contact Associate Professor Joakim Andréasson. The starting date of the position is flexible.
    Phone: +46 (0)31 772 28 38
    e-mail: a-son@chalmers.se
    Union representatives

    • SACO: Jan Lindér
    • ST: Marie Wenander
    • SEKO: Johan Persson
    All reachable via Chalmers exchange: +46 31 772 10 00

    روزگار است، آنكه گه عزت دهد گه خوار دارد. چرخ بازيگر از اين بازيچه ها بسيار دارد. "قائم مقام فراهانی"

  8. #68
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    پیش فرض پاسخ : موقعیت‌های خالی در دانشگاه‌های خارج از کشور

    4 PhD positions in materials science and fuel cells


    Fuel cells and water electrolysers are two central electrochemical devices of the hydrogen chain. One of the most successful types of the technologies is based on proton exchange membranes (PEM) as the electrolyte, which is under active development internationally as well as in Denmark.

    The Energy and Materials Science Group at Department of Chemistry, DTU, has for decades been involved in development of fundamental materials and technologies for fuel cells and electrolysers. The group has strong background and expertise in material science, high temperature chemistry and electrochemistry, electrocatalysis and hydrogen technologies. In the last 20 years the group has been active in the field of fuel cells and electrolysers, especially pioneering and leading in development of intermediate temperature PEM technologies. The research activities cover basic electrochemistry, fundamental materials, catalysts and electrodes, proton conducting electrolytes, MEAs, to stack technologies on kilowatt scale.

    The project is part of a newly established Danish-Chinese Centre for INTERMEDIARIES (Intermediate Temperature Proton Conducting Systems), jointly financed by the Danish National Research Foundation, the National Natural Science Foundation of China and DTU.

    The 4 PhD positions will be in the areas of (1) solid proton conducting electrolytes based on inorganic and/or inorganic-organic composite materials, (2) novel electrocatalyst of most preferably non-noble metal materials, and (3) key technologies for fabrication of membranes, electrodes, and membrane-electrode-assemblies for fuel cells and electrolyser cells, (4) the use of alternative fuels, like methanol with the fuel cells.

    We can offer you to work in a very international environment, not least due to the collaboration with other university groups working within chemistry and physics, as well as with industrial companies in European and Asian countries.

    Qualifications
    Candidates should have a master degree in chemistry or chemical engineering with a strong theoretical and experimental background in inorganic, physical or materials chemistry.

    Approval and Enrolment
    The scholarships for the PhD degree are subject to academic approval, and the candidates will be enrolled in one of the general degree programmes of DTU. For information about the general requirements for enrolment and the general planning of the scholarship studies, please see the DTU PhD Guide.

    Salary and appointment terms
    Salary and appointment terms are consistent with the current rules for PhD degree students.

    The period of employment is 3 years.

    Further information
    For further information, please contact: Professor Niels J. Bjerrum, Energy and Materials Science Group, Department of Chemistry, +45 4525 2307.

    Application
    We must have your online application by 1 May 2010. Please open the link "apply for this job online" and fill in the application form and attach your application, CV and information about academic grades.

    All interested candidates irrespective of age, gender, race, religion or ethnic background are encouraged to apply.
    روزگار است، آنكه گه عزت دهد گه خوار دارد. چرخ بازيگر از اين بازيچه ها بسيار دارد. "قائم مقام فراهانی"

  9. #69
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    پیش فرض پاسخ : موقعیت‌های خالی در دانشگاه‌های خارج از کشور

    PhD's: Moisture (1 p.) and chloride (1 p.) transport in concrete structures

    Department of Architecture, Building and Planning
    Date off
    31-05-2010
    Reference number
    V38.1142
    Unit Building Physics and Systems – Department of Architecture, Building and Planning - Eindhoven University of Technology:
    The Department offers a BSc in Building Science and MSc programmes in Architecture, Building and Planning, Building Services and Construction Management and Engineering. Education and research in the department focus on the development and use of technology in construction. Research is design and application oriented, based on fundamental scientific insights and methods.
    The research will be embedded in the unit Building Physics & Systems. Research and teaching of this unit aim to create and maintain a sustainable, healthy, comfortable and productive indoor and outdoor environment. The focus lies on physical aspects and processes including heat and mass transfer, chemical reactions, building materials, indoor air quality, lighting, acoustics, heating, ventilation and air-conditioning. The unit has about 30 scientific staff (including 20 PhD students) and ample physical laboratory facilities (supported by 7 technicians).
    Project description:
    The scientific research concerns the moisture and chloride diffusion in concrete, and is placed within the context of the STW Project “Chloride penetration in cracked and uncracked concrete structures”. The research focuses on the joint transient exchange of moisture and chloride between ambient environment and concrete, a multi-scale material. The interaction between the transport of moisture (1 position) and chloride (1 position), and the binding/adsorption of both species on the concrete is considered and modelled. These processes are crucial for assessing the service life-time of constructions. Another important aspect concerns the evaluation of accelerated migration lab-tests such as the Rapid Chloride Migration test as prediction tool for predicting the behaviour of real concrete. Based on this, the PhD candidate will re-design, build and operate lab facilities for testing lab-concrete and concrete cores drilled from exposed structures.
    For this research project excellent computational facilities, advanced microstucture models, and well-equipped physical/chemical, cement/concrete and microscopic laboratories, are available. Adjacent to this project, six other PhD candidates work on: eco-concrete, immobilization using cementitious binders, durability of concrete, development of nano-silica, development of gypsum plasterboards, and application of nanoparticles in concrete. Scientific institutions and the industrial sector have shown great interest in this study and the chair in which is placed, which is sponsored by a consortium of industrial and governmental partners. The research group maintains close contacts with construction industry and public authorities, and regularly convenes with their representatives that form our user group. Furthermore, there is frequent and intensive contact with other researchers, both domestic and abroad (mostly Europe, China and Japan).
    Requirements:
    A MSc degree, or equivalent (in architecture, building technology, mechanical/civil/chemical engineering, earth sciences, physics, chemistry, or similar discipline) having experience/interest in combined theoretical and experimental work. The ideal candidate will show an ability to develop and maintain good working relationships with external contacts and have excellent communication skills, particularly in written and spoken English.
    Salary:
    The duration of the projects is for 4 years. The gross monthly salary increases from 2.042,- Euro in the first year to 2.612,- Euro in the fourth year. Besides this, the TU/e has an excellent package of attractive benefits for employees, a child-care facility, and a modern sports complex. Assistance for finding accommodation can be given.
    Information:
    Intended starting date: September, 2010.
    More information can be obtained by contacting:
    Prof. dr. ir. H.J.H. Brouwers: jos.brouwers@tue.nl
    Application:
    Please e-mail your application, including extensive curriculum, by this link:
    Apply Now
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  10. #70
    ApplyAbroad Hero nima56 آواتار ها
    تاریخ عضویت
    Nov 2008
    ارسال‌ها
    1,505

    پیش فرض پاسخ : موقعیت‌های خالی در دانشگاه‌های خارج از کشور

    Synthesis and characterization of sulfonated hyperbranched poly(arylene oxindole) for hydrolysis of cellulose

    50000403v1837
    Promoter: Wim Dehaen, Bert Sels and Mario Smet


    Description: Acidic hydrolysis of cellulose is an attractive route to produce glucose in a sustainable

    way without direct competition with food supply. However, due to its crystalline structure, cellulose is

    highly resistant to hydrolysis, usually resulting in a slow process and many side products.

    Highly branched polymers have numerous terminal groups which can easily be interconverted. They usually display a higher solubility than their linear counterparts and hence are excellent candidates for homogeneous catalysis if catalytic groups are introduced at the well exposed terminal groups on the hyperbranched polymer surface. Additionally, for the hydrolysis of cellulose, a good adsorption of the catalyst to the insoluble cellulose particles is likely to be crucial for efficient conversion.

    Therefore, the hyperbranched poly(arylene oxindole)s recently developed in our group, are expected to have excellent characteristics for the development of highly efficient cellulose hydrolysis catalysts. They are relatively easily synthesized, can readily be decorated with numerous catalytically active terminal groups (such as sulfonic acid groups) and can additionally be functionalized with chemical groups specially intended to improve the adsorption to the cellulose particles. Moreover, they are perfectly stable under the expected reaction conditions (pH = ~0, ~150 °C).
    The synthesis is accomplished by acid catalyzed polycondensation of A3 monomer and commercially available isatin as the B2 monomer. The polymer thus obtained will be sulfonated, resulting in a tuneable number of sulfonic acid groups. It is anticipated that the local concentration of sulfonic acid groups combined with the amide groups, which are able to bind to the cellulose via hydrogen bonding, will result in high hydrolytic acitivity, with minimal by-products formed due to the moderate acidity of the aromatic sulfonic acid groups and the buffer effect of the amide groups.
    Crucial molecular characteristics will be varied in order to evaluate their effect on the catalytic activity, such as the molar mass and the number of sulfonic acid groups present. Moreover, linear analogues will be prepared and evaluated in order to assess the influence of the densely branched topology. Analogues containing additional amide groups will be synthesized using triamide as the A3 monomer. This will provide insight in the anticipated role of the amide groups as adsorbing entities. Finally, These hyperbranched molecules can readily be crosslinked, resulting in insoluble network particles. The catalytic activity of the latter will be evaluated as well, as they allow easy removal from the reaction mixture and hence facilitate the recycling of the catalyst.


    Key words: organic synthesis, hyperbranched polymers, cellulose hydrolysis, sustainable chemistry

    Latest application date: 2010-07-01

    Financing: dbof-scholarship

    Type of Position: scholarship

    Source of Funding: DBOF

    Duration of the Project : 4 years

    Research group: Department of Chemistry

    روزگار است، آنكه گه عزت دهد گه خوار دارد. چرخ بازيگر از اين بازيچه ها بسيار دارد. "قائم مقام فراهانی"

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