| 查看: 630 | 回复: 0 | |||
[交流]
2025年巴黎高科 - CSC合作公派读博项目 - 课题No.53
|
|
2025年巴黎高科 - CSC合作公派读博项目 - 课题No.53 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53详情: TITLE: EXPERIMENTAL MOLECULAR DYNAMICS - WATCHING INDIVIDUAL POLYMERS MOVING AT INTERFACES Topic number : 2024_053 Field : Chemistry, Physical chemistry and Chemical Engineering Subfield: ParisTech School: ESPCI Paris - PSL Research team : Jean Comtet Research team website: https://blog.espci.fr/jcomtet/ Research lab: SIMM - Sciences et ingénierie de la matière molle Lab location: Paris Lab website: https://www.simm.espci.fr/-Home-.html Contact point for this topic: jean.comtet@espci.fr Advisor 1: Jean Comtet - jean.comtet@espci.fr Advisor 2: Advisor 3: Advisor 4: Short description of possible research topics for a PhD: Molecular-scale interactions between polymers and solid surfaces govern a large range of processes in soft-matter, from wetting, elastomer and gel friction, down to confined flows in porous media. These situations are typically probed at an ensemble level and described by averaged phenomenological coefficients accounting for the behavior of the interface, e.g. a slip length in the case of the interfacial friction of a polymer melt. However, the molecular foundations behind this averaged vision remain unclear, due to our current inability to experimentally observe the intrinsically nanoscale molecular processes taking place at such interfaces. We aim here to bridge this gap by exploring novel experimental approaches to directly visualize molecular motion in dense polymeric liquid melts at the nanoscale. We will rely in particular on state-of-the-art single-molecule and super-resolution fluorescence microscopy techniques which can be used to localize and track the motion of individual fluorophores with nanoscale resolution and high temporal resolution. Preliminary results in our group have focused on the interfacial dynamics of flowing polymer solutions, demonstrating the feasibility of our approach for single-macromolecule tracking (Fig. D). Here, we aim to focus on dense polymeric melts (e.g. PDMS molecules), whose relaxation time and viscosity can be tuned over large time-scales through the control of their molecular weight or temperature. A fraction of these molecules will be tagged with a fluorophore (Fig. B), and by selectively imaging the interface with an evanescent wave, we will be able to directly localize their position (Fig. C) and follow their long-term dynamics. A fine control of the molecular-scale interactions between polymer chains and surfaces will be obtained by tuning surface physicochemistry. These single molecule measurements will be coupled with statistical analysis of the dynamics, allowing ultimately for a detailed and fundamental understanding and modelling of macromolecular interactions with solid surfaces. Our measurements will be carried out in a variety of equilibrium and out-of-equilibrium situations, tackling diverse scientific question related to liquid friction, triple line and wetting dynamics or mobility gradients close to solid surfaces. Required background of the student: Soft Matter, Polymer Physics, Optics A list of (5 max.) representative publications of the group: (Related to the research topic) 1. Direct observation of water mediated single proton transport between hBN surface defects. J Comtet, B Grosjean, E Glushkov, A Avsar, K Watanabe, T Taniguchi, R Vuilleumier, Marie-Laure Bocquet, A Radenovic. Nature Nanotechnology (2020). 2. Liquid-activated quantum emission from native hBN defects for nanofluidic sensing. N Ronceray, Y You, E Glushkov, M Lihter, B Rehl, TH Chen, GH Nam, K Watanabe, T Taniguchi, S Roke, A Keerthi, J Comtet, B Radha, A Radenovic. Nature Materials (2023) 3. Skaug, M. J., Mabry, J. N., & Schwartz, D. K. (2014). Single-molecule tracking of polymer surface diffusion. Journal of the American Chemical Society, 136(4), 1327-1332. |
回复此楼» 猜你喜欢
2026年国自然面上资助率
已经有20人回复
-
一个有机合成实验室都需要哪些设备？
已经有5人回复
-
面上再次挂了，太难了，躺也躺不了，倦也卷不过，小学校之殇！
已经有22人回复
-
微信指数没变化，科研之友没阅读
已经有18人回复
-
基础研究怎么拉横向，学校到款任务越来越多，难以完成 拉横向，都有哪些途径啊
已经有8人回复
-
HXDI做水性聚氨酯乳液，是不是特别容易出渣
已经有3人回复
-
系统今天又提示维护了，估计离放榜不远了
已经有15人回复
-
你们的时间戳变了吗
已经有4人回复
-
产物和副产物价值比较
已经有5人回复
-
时间戳他又来了
已经有17人回复