Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session B06: Membranes, Micelles and Vesicles
11:30 AM–2:18 PM,
Monday, March 15, 2021
Sponsoring Unit: DSOFT
Chair: Hendrik Spanke, ETH Zurich
Abstract: B06.00001 : Dynamics of spontaneous wrapping of microparticles by floppy lipid membranes*
11:30 AM–11:42 AM
Eric R Dufresne
In a recent study we have observed experimentally how micron sized particles adhere and are subsequently enveloped by lipid membranes (Spanke, arxiv: 2007.03620 [cond-mat.soft], 2020). The lipid membranes are characterized by a bending rigidity κb and a membrane tension σ, which is near zero in our experiments. The polystyrene microparticles we use experience depletion interactions introducing an adhesion energy. Both the adhesion energy and particle size can be varied continuously in our system without changing the underlying composition.
At high adhesion strengths, the particles are enveloped spontaneously. We measure the velocity of this spontaneous wrapping process as well as the forces experienced by the particle using an optical trap.
These results offer insight into the energy landscape of the wrapping process as well as the contact line dynamics.
*Grant number 172824 of the Swiss National Science Foundation
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