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- W4282037697 abstract "Nanocapsules are hollow nanoscale shells that have applications in drug delivery, batteries, self-healing materials, and as model systems for naturally occurring shell geometries. In many applications, nanocapsules are designed to release their cargo as they buckle and collapse, but the details of this transient buckling process have not been directly observed. Here, we use in situ liquid-phase transmission electron microscopy to record the electron-irradiation-induced buckling in spherical 60-187 nm polymer capsules with ∼3.5 nm walls. We observe in real time the release of aqueous cargo from these nanocapsules and their buckling into morphologies with single or multiple indentations. The in situ buckling of nanoscale capsules is compared to ex situ measurements of collapsed and micrometer-sized capsules and to Monte Carlo (MC) simulations. The shape and dynamics of the collapsing nanocapsules are consistent with MC simulations, which reveal that the excessive wrinkling of nanocapsules with ultrathin walls results from their large Föppl-von Kármán numbers around 105. Our experiments suggest design rules for nanocapsules with the desired buckling response based on parameters such as capsule radius, wall thickness, and collapse rate." @default.
- W4282037697 created "2022-06-13" @default.
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- W4282037697 date "2022-05-27" @default.
- W4282037697 modified "2023-10-14" @default.
- W4282037697 title "Dynamics of Polymer Nanocapsule Buckling and Collapse Revealed by <i>In Situ</i> Liquid-Phase TEM" @default.
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- W4282037697 doi "https://doi.org/10.1021/acs.langmuir.2c00432" @default.
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