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

Title
Shaping micro-clusters via inverse jamming and topographic close-packing of microbombs
Authors
홍순만구종민박현철알버트 이성수이승환홍준표유승건조혜성Jason Christopher Jolly강홍석이진홍김준수박철민Shu Yang
Keywords
jamming; packing; expandable bead; EMI shielding
Issue Date
2017-09
Publisher
Nature Communications
Citation
VOL 8, NO 721-9
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.
URI
http://pubs.kist.re.kr/handle/201004/66365
ISSN
2041-1723
Appears in Collections:
KIST Publication > Article
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