Biological & Soft Matter Seminar: Shaping liquid droplets and elastic membranes

Prof. Zvonimir Dogic, UCSB, USA

19 February 2020, 11:10 
Ornstein Building, Room 110 
Biological & Soft Matter Seminar


We describe two self-assembly pathways observed in micron-thick colloidal membranes which spontaneously assemble in mixtures of monodisperse colloidal rods and non-adsorbing polymer. In a first example we study mechanisms by which membrane imbedded 2D liquid droplets acquire unusual non-spherical shapes, suggesting that the interfacial edge domain has spontaneous non-zero edge curvature. These experimental observations can be explained by a simple geometric argument which predicts that the edge curvature towards shorter rod domains softens the resistance of the edge to twist. In a second example, we study the 3D structure of membranes composed of miscible rod-like molecules of differing lengths. Above critical concentration of shorter rods flat 2D membranes become unstable and assume a bewildering variety of different shapes and topologies. Simple arguments suggest that doping colloidal membranes with miscible shorter rods tunes the membrane’s Gaussian modulus, which in turn destabilizes flat 2D membranes. 



Tel Aviv University makes every effort to respect copyright. If you own copyright to the content contained here and / or the use of such content is in your opinion infringing, Contact us as soon as possible >>
Tel Aviv University, P.O. Box 39040, Tel Aviv 6997801, Israel
UI/UX Basch_Interactive