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2025年巴黎高科 - CSC合作公派读博项目 - 课题No.39,40
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2025年巴黎高科 - CSC合作公派读博项目 - 课题No.39,40 2025 巴黎高科 - CSC公派博士项目 （12月8日截止） 网申通道：https://paristech.kosmopolead.com/phd 申请攻略：https://paristech.fr/fr/paristech-csc-phd-program-how-apply 课题39,40详情: TITLE: NATURAL FIBERS FOR SUSTAINABLE DEVELOPMENT: EXPERIMENTAL STUDY OF THE SURFACE ENERGY AND THE ADHESION PROPERTIES Topic number : 2024_039 Field : Energy, Processes Subfield: ParisTech School: Arts et Métiers Research team : Porous Media Research team website: https://www.i2m.u-bordeaux.fr/Re ... Transferts-Fluides- Energetique/Groupe-Milieux-Poreux Research lab: I2M - Institut de Mécanique et d'ingénierie Lab location: Bordeaux Lab website: https://www.i2m.u-bordeaux.fr/ Contact point for this topic: BEN ABDELWAHED Amine amine.ben- abdelwahed@ensam.eu Advisor 1: Azita AHMADI-SENICHAULT - azita.ahmadi@ensam.eu Advisor 2: Amine BEN ABDELWAHED - amine.ben- abdelwahed@ensam.eu Advisor 3: Advisor 4: Short description of possible research topics for a PhD: The use of natural fibers (wood fibers, Flax, Cotton, etc.) as bio-materials provides several advantages for eco-materials including eco-friendliness, flexibility, cost reduction, biogenic carbon storage and biodegradation. However, natural fibers are hydrophilic materials which are highly sensitive to humidity therefore highly prone to agglomeration. Consequently, a chemical treatment that improves dispersion, adhesion, and compatibility with the matrix fluid (polymeric in general) is recommended. However, wet chemical treatment contains several steps (fibers impregnation in an aqueous solution, drying and curing) generating significant effluents, energy consumption and toxic gas emission. The aim of this PHD Thesis is to study the influence of the chemical composition of natural fibers on moisture sorption, water retention and thus, fiber surface energy. Surface energy composed of dispersive and polar parts is an important parameter for fiber and fluid matrix adhesion. Various experiments (Fig 1: Thermogravimetric analysis, Differential Scanning Calometry, Gas Chromatography and Fig 2: adhesion and capillary properties) for different fiber samples with different compositions and different chemical treatments will be conducted to evaluate the capillary and the adhesion properties. The final goal is to find a good accommodation between the adhesion properties and the fiber chemical treatment in order to decrease effluents and toxic gas emission . Required background of the student: A solid theoretical and experimental understanding of the fundamentals of fluid mechanics and material science would be appreciated. A list of (5 max.) representative publications of the group: (Related to the research topic) 1. Liu S., Ahmadi-Senichault A., Ben Abdelwahed A., Yao H., Lachaud J. (2024). Experimental investigation and DEM-CFD analysis of Darcy– Forchheimer flows in randomly packed bed systems of wood particles. International Journal of Heat and Mass Transfer, Vol 235: 126229 2. Ben Abdelwahed A., Wielhorski Y., Bréard J. (2014). Bubble formation and transport in T-junction for application to Liquid Composite Molding. J. of Composite Materials, Vol 48: 37-48 3. Wielhorski Y., Ben Abdelwahed A., Bréard J. (2013). Theoretical Approach of Bubble Entrapment Through Interconnected Pores: Supplying Principle. Transport in Porous Media, Vol 96: 105-116 4. Wu J. et al (2024). Recent development and application of natural fiber in asphalt pavement. Journal of Cleaner Production 449, 141832 5. Müller K. et al (2017). Review on the processing and properties of polymer nanocomposites and nanocoatings and their applications in the packaging, automotive and solar energy fields. Nanomaterials 7:74 TITLE: INVESTIGATIONS OF TWIP AND TRIP MECHANISMS IN ZR AND TI METASTABLE ALLOYS Topic number : 2024_040 Field : Material science, Mechanics and Fluids Subfield: TWIP TRIP alloys ParisTech School: Chimie ParisTech - PSL Research team : Métallurgie Structurale Research team website: Research lab: IRCP - Institut de Recherche de Chimie de Paris Lab location: Paris Lab website: https://www.ircp.cnrs.fr/en/chemistry-research-institute-of- paris/ Contact point for this topic: SUN Fan fan.sun@chimieparistech.psl.eu Advisor 1: Fan Sun - fan.sun@chimieparistech.psl.eu Advisor 2: Advisor 3: Advisor 4: Short description of possible research topics for a PhD: The phenomena of Twinning Induced Plasticity (TWIP) and Transformation Induced Plasticity (TRIP) play a crucial role in improving the mechanical properties of zirconium and titanium alloys. These alloys’ metastable states enable the activation of twinning and martensitic transformations under external stress. The mechanical behavior of these alloys is influenced by factors such as the metastability of the beta phase, alloying elements, chemical composition, grain structure, secondary phase precipitation, and manufacturing and thermomechanical processes. Our recent studies have shown that the TWIP effect can be observed in various Zr and Ti alloy compositions with elements like Nb, Mo, and Sn. The interactions between dislocations and mechanical twinning significantly affect the alloys’ macroscopic mechanical properties. This thesis aims to clarify the fundamental mechanisms behind these effects, which remain not fully understood. Required background of the student: Candidate should be last-year in master course or first-year PhD course during application Master's degree in Material Science and Engineering or Metallic Materials Background in electron microscopy and physical metallurgy Proficient in English communication and writing Competent in collaborative teamwork and project management A list of (5 max.) representative publications of the group: (Related to the research topic) 1. Tang, J., Yang, H., Qian, B., Zheng, Y., Vermaut, P., Prima, F., & Sun, F. (2024). TWIP-assisted Zr alloys for medical applications : Design strategy , mechanical properties and first biocompatibility assessment. Journal of Materials Science & Technology, 184, 32–42. https://doi.org/10.1016/j.jmst.2023.09.051 2. Tang, Junhui; Zorgati, Ahmed; Gaillard, Jean-Baptiste; Vermaut, Philippe; Prima, Frédéric; Sun, F. (2023). Twinning-induced plasticity (TWIP) effect in multi-phase metastable beta Zr-Nb alloys. Journal of Materials Science & Technology, 139, 120–125. https://doi.org/https://doi.org/10.1016/j.jmst.2022.07.062 3. Qian, B., Mantri, S. A., Dasari, S., Zhang, J., Lilensten, L., Sun, F., Vermaut, P., Banerjee, R., & Prima, F. (2023). Mechanisms underlying enhanced strength-ductility combinations in TRIP/TWIP Ti-12Mo alloy engineered via isothermal omega precipitation. Acta Materialia, 245(September 2022). https://doi.org/10.1016/j.actamat.2022.118619 4. Qian, B., Yang, M., Lilensten, L., Vermaut, P., Sun, F., & Prima, F. (2022). In-situ observations of a hierarchical twinning–detwinning process in stress-induced α ′′ -martensite of Ti-12Mo alloy. Materials Research Letters, 10(2), 45–51. https://doi.org/10.1080/21663831.2021.2013967 5. Tekoglu, E., Bae, J.-S., Kim, H.-A., Lim, K.-H., Liu, J., Doležal, T. D., Kim, S. Y., Alrizqi, M. A., Penn, A., Chen, W., Hart, A. J., Kang, J.-H., Oh, C.-S., Park, J., Sun, F., Kim, S., Sim, G.-D., & Li, J. (2024). Superior high- temperature mechanical properties and microstructural features of LPBF- printed In625-based metal matrix composites. Materials Today. https://doi.org/10.1016/j.mattod.2024.09.006 |
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