Shaping micro-clusters via inverse jamming and topographic close-packing of microbombs

Seunggun Yu, Hyesung Cho, Jun Pyo Hong, Hyunchul Park, Jason Christopher Jolly, Hong Suk Kang, Jin Hong Lee, Junsoo Kim, Seung Hwan Lee, Albert S. Lee, Soon Man Hong, Cheolmin Park, Shu Yang () and Chong Min Koo ()
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Seunggun Yu: Korea Institute of Science and Technology
Hyesung Cho: Korea Institute of Science and Technology
Jun Pyo Hong: Korea Institute of Science and Technology
Hyunchul Park: Korea Institute of Science and Technology
Jason Christopher Jolly: University of Pennsylvania
Hong Suk Kang: University of Pennsylvania
Jin Hong Lee: Korea Institute of Science and Technology
Junsoo Kim: Electronics and Telecommunications Research Institute
Seung Hwan Lee: Korea Institute of Science and Technology
Albert S. Lee: Korea Institute of Science and Technology
Soon Man Hong: Korea Institute of Science and Technology
Cheolmin Park: Yonsei University
Shu Yang: University of Pennsylvania
Chong Min Koo: Korea Institute of Science and Technology

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: Abstract 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.

Date: 2017
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DOI: 10.1038/s41467-017-00538-z

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