Tunable silica/graphene composite based hierarchical closed-cellular structure
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초록
내용
Cellular structure is breakthrough to design lightweight, strong materials for various scientific and engineering industries. In particular, hierarchical closed-cellular structure (CCS) consisted of uniform building units can be utilized as advanced materials. Here, we report the tunable CCS with wide range of density and modulus characterizing elastic or thermal insulation property. We show that the tunable CCS can be generated with elaborately controlled hollow bubbles as building units made by microfluidic system. The carbon/silica composite bubble can have wide variation of shell thickness of 90nm-3.2μm depending on the constituent. The tunable CCS can be achieved after thermal treatment of simply assembled bubbles, resulting in different morphology (rhombic dodecahedral honeycomb structure or fused-face-centered cubic structure). The tunable CCS exhibits the wide window of density above two orders while maintaining high young’s modulus with elastic or thermal insulation property