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DTSTART;TZID=Europe/Paris:20220414T140000
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DTSTAMP:20260424T083529
CREATED:20220411T043044Z
LAST-MODIFIED:20220411T064752Z
UID:8031-1649944800-1649952000@fermi.univ-tlse3.fr
SUMMARY:Reconfigurable self-assembly: evolutive DNA nanomachines\, coffee-ring diagnostics and living crystals (Damien Baigl / LPCNO / Seminar). - 14/04\, 14H
DESCRIPTION:Damien Baigl (ENS Paris) \nAbstract : \nSelf-assembly is a both a formidable method to organize molecular or colloidal entities into functional superstructures and a playground for the scientific endeavor on how matter organizes itself. Self-assembly is also a key-feature of how life builds its components. However\, compared to their living counterparts\, synthetic materials made by self-assembly usually lack some of the characteristic properties of living systems such as reconfigurability\, adaptability or evolution. In this presentation\, I will describe different systems where such properties can emerge from self-assembled synthetic materials. First\, I will show that elaborate user-defined DNA nanostructures (e.g.\, DNA origamis\, tiles\, extended nanogrids) can be obtained by spontaneous self-assembly at room temperature for the first time with a unique capability to adapt to their environment by changing their shape\, transforming and evolving [1\,2]. Then\, I will present a new DNA self-assembly principle that does not rely on base-pairing principles. I will show in particular that photosensitive DNA intercalating molecules can co-assemble with DNA bases to form new extended supramolecular materials of unprecedented properties. I will describe in particular the formation of photoswitchable 3D crystals with unique photoreversible growth and light-gated fluorescence [3]. Finally\, I will present different colloidal self-assembly processes at air-water or liquid-liquid interfaces and explore how dynamic properties can emerge from such systems. Starting from the familiar situation of drying drop containing a colloidal suspensions\, we have been interested in controlling/cancelling the so-called “coffee-ring effect” [4-7] or turning it into a low-cost yet powerful medical diagnostic tool [8]. In such systems\, however\, particles adsorb at the interface to form amorphous structures. This led us to invent a simple method in which bulk particles adsorb at the water-interface and directly crystallize there. Based on the use of ultralow amounts of surfactant\, 2D colloidal crystals spontaneously form without any other applied force than their own weight [9]. This method allows us to crystallize a broad variety of nanometric and micrometric particles\, including those made of polymers\, metals or inorganic materials\, and tune the characteristics of the colloidal crystals [10]. These colloidal crystals display intense structural colors as well as\, under some conditions\, some remarkable dynamic properties at the air/water interface. For instance\, using light\, we can reversibly melt/crystallize these colloidal assemblies on command\, evidencing interesting life-like properties\, such as dissipative or living crystallization [11\,12]. \nReferences:[1] Rossi-Gendron et al.\, ChemRxiv 2022 (preprint)\, doi :  10.26434/chemrxiv-2022-12jqs[2] Nakazawa et al.\, Angew. Chem. Int. Ed. 2021\, 60\, 15214 –15219[3] Zhou et al.\, J. Am. Chem. Soc. 2019\, 141\, 9321–9329[4] Anyfantakis et al.\, Angew. Chem. Int. Ed. 2014\, 53\, 14077–14081[5] Varanakkottu et al.\, Nano Lett. 2016\, 16\, 644–650[6] Poulichet et al.\, J. Colloid. Interf. Sci. 2020\, 573\, 370-375[7] Galy et al.\, ACS Appl. Mater. Interfaces 2022\, 14\, 3374–3384[8] Devineau et al.\, J. Am. Chem. Soc. 2016\, 138\, 11623–11632[9] Anyfantakis\, Langmuir 2018\, 34\, 15526−15536[10] Vialetto et al.\, Nanoscale 2020\, 12\, 6279-6284[11] Vialetto et al. Angew. Chem. Int. Ed. 2019\, 58\, 9145-9149[12] Vialetto et al.\, J. Am. Chem. Soc. 2021\, 143\, 11535−11543
URL:https://fermi.univ-tlse3.fr/event/reconfigurable-self-assembly-evolutive-dna-nanomachines-coffee-ring-diagnostics-and-living-crystals-damien-baigl-lpco-seminar-14-04-14h/
LOCATION:Amphi Vinci\, bâtiment 20 du LPCNO\, INSA – LPCNO : 135 avenue de Rangueil\, Toulouse\, 31077\, France
CATEGORIES:Events,LPCNO,Seminars
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