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X-ORIGINAL-URL:https://www.lps.u-psud.fr/
X-WR-CALNAME:Laboratoire de physique des Solides
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DTSTART;TZID=Europe/Paris:20260320T110000
DTEND;TZID=Europe/Paris:20260320T120000
DTSTAMP:20251219T090200
UID:MEC-27934a1f19d678a1377c257b9a780e80@lps.u-psud.fr
CREATED:20251219
LAST-MODIFIED:20260311
PRIORITY:5
TRANSP:OPAQUE
SUMMARY:PhysBio Seminar: Saikat Saha
DESCRIPTION:\nProbing properties of fluid interfaces at the scale of picolitre droplets and Genetically-encoded interfaces\n\n\n\nSaikat Saha1, Cécile Monteux2, Damien Baigl1\n\n\n\n\nCPCV, Department of Chemistry, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France\n\n\n\nSciences et Ingénierie de la Matière Molle, École Supérieure de Physique et de Chimie Industrielles de la Ville de Paris, 75005 Paris, FranceE-mail : saikat.saha@ens.psl.eu\n\n\n\n\nThe mechanical properties of complex fluid interfaces dictate how the emergent behaviours of the microstructure manifest as functional properties. I will briefly discuss my previous work on utilising acoustic-driven bubble oscillations to interrogate the broad-spectrum deformation behaviour of complex interfaces. Next, I will describe my current efforts in developing anexperimental microfluidic framework to characterise interfacial viscoelasticities for picolitre volume droplets, particularly useful for precious quantities. Fundamentally, it offers a simple approach to probe mechanical properties in regimes of length-scales and time-scales where information from conventional macroscopic rheometric methods cannot always be extrapolated to. Finally, I will describe our exploratory work on programmable soft materials wherein a system is provided with a synthetic genome in which all the properties of the soft material could virtually be encoded. This combined with cell-free expression of interfacially-active proteins enables the control of surface tension and interfacial elasticity at a genetic level. In effect, it permits a closed system – of fixed composition, with the same starting raw materials – to dynamically evolve its own interfacial properties to have autonomous spatio-temporal effects. This has allowed us to program dynamic surface tension profiles as well as create fluid propulsion at the macroscale, which to our knowledge, is the first example of genetically-driven surface tension regulation and fluid transport.\n\n\n\nKeywords: viscoelastic interfaces, microfluidics, programmable soft matter, DNA\n
URL:https://www.lps.u-psud.fr/en/events/seminar-saikat-saha/
CATEGORIES:Soft matter and Phys-Bio seminar
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