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PhD studentship 2017-Univeristy of Bordeaux (Deadline: Feb 24th 2017)
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大家再次新年好！ 与往年一样，今年法国波尔多大学的CSC公派又开始了，再次受之前朋友委托，帮转发以下2017年的PhD招牌广告 (Deadline: Feb 24th 2017，但是还是尽早联系为好，别赶在最后一天)，如果感兴趣的，请从速；希望有志留法的朋友们能积极申请，波尔多不会让你们失望，:-) 这个是法国与csc的公派专项，每年icmcb都能拿到几个名额，所以只需要直接联系老板，然后走下csc的官方程序即可。（有些信息也可以查阅我之前四年的帖子：https://muchong.com/bbs/viewthread.php?tid=9919069； https://muchong.com/bbs/viewthread.php?tid=6898912 和 https://muchong.com/bbs/viewthread.php?tid=5513969； https://muchong.com/bbs/viewthread.php?tid=8383308） 具体申请或者咨询，请直接联系 Prof. Corine MATHONIERE: corine.mathoniere@icmcb.cnrs.fr， Prof Graziella GOGLIO +33 5 40 00 63 34 graziella.goglio@u-bordeaux.fr Dr Catherine ELISSALDE +33 5 40 00 26 96 catherine.elissalde@icmcb.cnrs.fr 建议附上你的CV， brief summary of you education background, research experience, reserach interest, motivation letter, list of publication, list of referrences with detailed contact information, proof of good level of French or English language proficiency 以及其他你觉得有用的信息。截至日期Deadline: Feb 24th 2017；再次建议大家越早联系越好。 非学术问题，可以发我邮件liujizgd@yahoo.com或者站内信，我尽我所能回复你们。 以下是research proposal，大家可以通过这些了解下具体的课题方向 Hydrothermal Sintering : an innovative low temperature sintering process for the densification of ceramics The mastery of sintering processes is a key for the development of new, high performance ceramics. Currently most of advanced ceramic materials are fabricated from powders and sintered above 1000°C to reach at least 95% of their theoretical densities. The reduction of surface free energy, which is a driving force for sintering, might be promoted either by applying pressure or by enhancing diffusional processes using fast heating routes. Thus, intense international research has led to the development of numerous sintering techniques such as two-step, flash, high pressure, spark plasma, microwave sinterings….However the high temperatures required by these processes create several technological barriers: (i) advanced materials need to be produced by energy- and cost-efficient processes to ensure the feasibility of industrial scalability, (ii) the use of initial nanoparticles leads to reduced sintering temperatures, however the competition between densification, coarsening processes and agglomeration often yields microstructures with overly coarse grains, which is detrimental to densification, (iii) materials that are metastable or that decompose at low temperature are difficult to sinter with such processes and (iv) co-sintering of multimaterials is hindered by differences in thermal stability, the rate and the onset temperature of shrinkage, and the physical and/or chemical compatibilities between the components. For these reasons, there is an indisputable interest to develop low temperature (below 500°C), efficient sintering process (> 95% of compactness). Hydrothermal sintering is a powerful technology that surmounts the aforementioned barriers. This process, also called Hydrothermal Hot Pressing, was first developed by N. Yamasaki in the early 90’s. Here, a powder with water is externally and mechanically compressed in an autoclave, under hydrothermal conditions (T < 350°C; P < 200 MPa) over short time periods (from a few minutes to a few hours). Here, water acts as a solvent and mass transport media, and certainly enhances creep at the solid/solid interface to promote densification activated by dissolution/precipitation phenomena at the solid/liquid interface. Thus this process promotes surface chemistry phenomena in a hydrothermal solvent, as diffusion processes in the solid phase are unexpected at such low temperatures. For such reasons, hydrothermal sintering offers relevant and affordable solutions to overcome standard technological limitations. It might be suitable to densify metastable materials, materials with mild temperature decomposition, porous ceramics, nanomaterials without coarsening or to bond different materials. In June 2016, C. Randall el al. from Pennsylvania State University have reported impressive sintering results (95% of compactness reached on a large panel of ceramics and composites then evidencing device fabrication) with a process called the “Cold Sintering Process” based on hydrothermal sintering. This unambiguously corroborates the impressive potential of hydrothermal sintering. Two apparatuses were designed in 2012 within the ICMCB (350°C, 350 MPa) and optimized for the densification of (nano)materials). Many experimental results have been collected on silica nanoparticles sintering (Fig.1) and technological limitations have been overcome. We plan to sinter model nanoparticle systems either crystallized or amorphous (size range : below 100 nm – hundreds of nm). Our objective is to propose a mechanistic scenario on the basis of rationalized experimental results. Selected materials will be simple oxides to favor congruent dissolution. We will check the influence of all experimental parameters: water amount, pressure, temperature, holding time, pH, co-solvent, nanoparticle shape and size. Starting nanoparticles will be either commercial products or home made materials, depending on the selected oxide. Ceramics will be characterized by porosimetry intrusion, BET experiments, He Pycnometry, XRD, TGA, electronic microscopy (HRTEM and HRSEM), micro- and macro-hardness, and compression measurements to evaluate mechanical strength. Candidate’s eligibility • Candidates must be citizens and permanent residents of the People’s Republic of China at the time of application • Candidates must not be currently working abroad • Successful candidates must return to China upon completion of the studies and/or research • Candidates must have a good level of English (or French) language proficiency • Candidates should specify in their application that they are applying for the UB/CSC joint scholarship scheme • Candidates can only apply for one subject • Candidates from Hong-Kong are not eligible Process • Candidates send the completed application form with all the requested documents by February 24th 2017 to the PhD project supervisor at UB. • UB will evaluate the student files, academic performance and English language proficiency of the candidates. Interviews will be conducted by the PhD supervisors via telephone or via videoconference. • By March 16th 2017 UB will provide CSC and each qualified candidate with a copy of the admission letter. • By the beginning of April 2017, after receiving the admission letter from the University of Bordeaux, candidates must apply to the CSC by completing an application for funding. Forms are available online at https://apply.csc.edu.cn through CSC’s application agencies. • CSC will evaluate the candidates according to CSC requirements and priorities. The CSC Council will subsequently provide UB with a final list of scholarship recipients and inform the successful candidates before the end of May 2017. 相关文件请大家从下载 https://pan.baidu.com/s/1bpvKb1P |
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