Department Seminar of Itamar Kolvin - Active polymerized membranes: nonequilibrium self-assembly and self-organized dynamics

05 December 2022, 14:00 - 15:00 
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Department Seminar of Itamar Kolvin - Active polymerized membranes: nonequilibrium self-assembly and self-organized dynamics

 

 

 

School of Mechanical Engineering Seminar

Monday, December 5, 2022 at 14:00
Wolfson Building of Mechanical Engineering, Room 206

Active polymerized membranes: nonequilibrium self-assembly and self-organized dynamics

Dr. Itamar Kolvin

Physics Department, UC Santa Barbara

Engineering flows and deformation is typically a top-down approach: think of a fluid pumped through a pipe, or a concrete pillar supporting a structure. Biology, however, often takes a bottom-up approach to mechanics. Microscopic actin filaments self-assemble into contracting sarcomere units and then into the myofibrils and muscle fibers that make up our skeletal muscles. In this talk, I will introduce the field of active matter: fluids and solids that are driven by mechanically active microscopic units. I will show how extensile active flows drive the assembly of polymerized membranes in an aqueous environment. Initially, homogeneously and isotropically distributed actin bundles condense into a thin two-dimensional layer where they connect to form an elastic network of tens-of-microns pore size. Membranes then exhibit out-of-plane bending fluctuations that exceed thermal motions by orders of magnitude. Active bending endows the fluctuating membranes with in-plane deformation soft modes that coarsen into large, millimeter-scale, strain fluctuations. For membranes that are a few millimeters in width, system-size displacement oscillations appear that are coupled to unidirectional flow waves. Active matter is thus an emerging paradigm for the mechanical control of assembly and dynamics in materials. I will discuss future extensions of this principle.

 

Short Bio:

Dr. Itamar Kolvin received his Ph.D. from the Hebrew University of Jerusalem for studying dynamic fracture fronts in brittle hydrogels. In 2017, he became a Human Frontier Science Program fellow at UC Santa Barbara, where he pursues postdoctoral research in active and adaptive soft materials. Dr. Kolvin is broadly interested in the non-equilibrium mechanics of fluids and solids at the nexus of hydrodynamics, elasticity, and soft matter.

 

Join Zoom Meeting

https://tau-ac-il.zoom.us/j/4962025174?pwd=bVJUeElXRUUya3BERisyNllLOE9EZz09

 

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