Shaping micro-clusters via inverse jamming and topographic close-packing of microbombs
- Shaping micro-clusters via inverse jamming and topographic close-packing of microbombs
- 홍순만; 구종민; 박현철; 알버트 이성수; 이승환; 홍준표; 유승건; 조혜성; Jason Christopher Jolly; 강홍석; 이진홍; 김준수; 박철민; Shu Yang
- jamming; packing; expandable bead; EMI shielding
- Issue Date
- Nature Communications
- VOL 8, NO 721-9
- Designing topographic clusters is of significant interest, yet it remains challenging as they often lack mobility or deformability. Here we exploit the huge volumetric expansion (up to 3000%) of a new type of building block, thermally expandable microbombs. They consist of a viscoelastic polymeric shell and a volatile gas core, which, within structural confinement, create micro-clusters via inverse jamming and topographical close-packing. Upon heating, microbombs anchored in rigid confinement underwent balloon-like blowing up, allowing for dense clusters via soft interplay between viscoelastic shells. Importantly, the confinement is unyielding against the internal pressure of the microbombs, thereby enabling self-assembled clusters, which can be coupled with topographic inscription to introduce structural hierarchy on the clusters. Our strategy provides densely packed yet ultralight clusters with a variety of complex shapes, cleavages, curvatures, and hierarchy. In turn, these clusters will enrich our ability to explore the assemblies of the ever-increasing range of microparticle systems.
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