Mechanical and thermal engineering of functional nanomembranes

Speaker: Prof. Bartłomiej Graczykowski
Affiliation: Faculty of Physics, Adam Mickiewicz University, Poznań, Poland
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Meeting ID: 386 560 357 817, Passcode: V9AXZJ 
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Continuous miniaturization of electronics, increasing computing power and data transmission speed, an alternative to silicon-based electronics, and obtaining new sources of clean energy are among the most vital challenges in physics, chemistry, and material engineering. The search for new materials, structures, and composites that can meet these requirements has contributed to the spectacular development of nanoscience and nanotechnology in the last two decades. What is essential, the search for new nanomaterials with application potential is often a compromise between excellent properties and incurred energy and environmental costs.

In this talk, I will present the results of experimental research focused on such topics as (i) polydopamine membranes for ultra-fast light-to-motion conversion [1], (ii) silicon thermal diode [2], (iii) elastic size effect in MoSe2 [3], (iv) GHz signal filtering in 2D Phononic Crystals [4] and (v) mechanical reinforcement of colloidal crystals by a cold soldering process based on polymer plasticization using supercritical fluids [5,6].

References:

1. Vasileiadis, T. et al. Fast Light-Driven Motion of Polydopamine Nanomembranes. Nano Lett. 22, 578–585 (2022).
2. Kasprzak, M. et al. High-temperature silicon thermal diode and switch. Nano Energy , 105261 (2020).
3. Babacic, V. et al. Thickness-Dependent Elastic Softening of Few-Layer Free-Standing MoSe2. Advanced Materials 33, 2008614 (2021).
4. Graczykowski, B., Vogel, N., Bley, K., Butt, H.-J. & Fytas, G. Multiband Hypersound Filtering in Two-Dimensional Colloidal Crystals: Adhesion, Resonances, and Periodicity. Nano Lett. acs.nanolett.9b05101 (2020) doi:10.1021/acs.nanolett.9b05101.
5. Varghese, J. et al. Size-dependent nanoscale soldering of polystyrene colloidal crystals by supercritical fluids. Journal of Colloid and Interface Science 633, 314–322 (2023).
6. Babacic, V. et al. Mechanical reinforcement of polymer colloidal crystals by supercritical fluids. Journal of Colloid and Interface Science 579, 786–793 (2020).

Chairman: Prof. Jacek Gapiński

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