Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Série SEM-BESSON
Domaines cond-mat
Date Mardi 29 Septembre 2009
Heure 10:30
Institut IMPMC
Salle Salle de conférence, Bâtiment 15,140 rue de Lourmel, 75015 Paris
Nom de l'orateur Stroock
Prenom de l'orateur Abraham
Addresse email de l'orateur
Institution de l'orateur Laboratoire de Physique Statistique, Ecole Normale Supérieure
Titre What can we learn from plants about water at negative pressures ?
Résumé Liquids, like solids, have tensile strength. Indeed, scientists have long known that plants exploit this strength to pull water out of the soil and up to their leaves with the pressures in the sap down to -100 bar (tensions up to 100 bar). Nonetheless, the metastable state of liquids under tension, beneath the binodal and above the spinodal, had been only sparsely explored scientifically and hardly exploited technologically. In this talk, I will discuss the thermodynamics of transpiration in plants and present a bio-mimetic route to large tensions in the laboratory. Based on experiments with “synthetic plants”, I will illustrate the surprising processes that are enabled by working in this regime. I will then discuss the origin of the limit of stability of liquid water in plants (natural and synthetic) and more generally. Finally, I will conclude with the presentation of opportunities to exploit this regime to gain insights into the fundamental character of the liquid water (e.g., the origin of water anomalies) and to address important technological challenges in the management of energy and natural resources.
Numéro de preprint arXiv
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