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小羊yang**鐵蟲 (小有名氣)
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2025年巴黎高科 - CSC合作公派讀博項目 - 課題No.53
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2025年巴黎高科 - CSC合作公派讀博項目 - 課題No.53 2025 巴黎高科 - CSC公派博士項目 （12月8日截止） 網(wǎng)申通道：https://paristech.kosmopolead.com/phd 申請攻略：https://paristech.fr/fr/paristech-csc-phd-program-how-apply 課題53詳情: 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. |
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