Multifunctional Bicontinuous Composite Foams with Ultralow Percolation Thresholds

ACS Applied Materials & Interfaces
Jiabin XiChao Gao

Abstract

Integrating ultralight weight and strong mechanical performance into cellular monolith is a challenge unresolved yet. Here, we propose a skeleton-assisted self-assembly method to design ultralight bicontinuous composite foams (BCCFs) with high mechanical robustness and ultralow percolation thresholds. Polymer foam was employed as the skeleton to support assembled graphene networks, forming BCCFs with a high tensile strength (∼80 kPa) and breakage elongation (>22.2%). The paraffin and poly(dimethylsiloxane) infiltrated BCCFs show a record low percolation threshold of 0.006 vol % and a relatively high electrical conductivity of 0.81 S m-1 at a low graphene content of 0.216 vol %. The BCCFs demonstrate high and adjustable microwave-absorbing (MA) properties. The effective absorption bandwidth (reflection loss ≤ -10 dB) for BCCFs with a low graphene loading of 3.4 mg cm-3 achieves 9.0 GHz at a thickness of 4 mm, and it further covers 13.6 GHz considering the adjustability of preferred absorption band. The BCCFs with an extremely low graphene load of 0.14 mg cm-3 were further used for durable and efficient oil adsorption, which can adsorb >60 times their own weight. The facile fabrication of bicontinuous composite foams opens the av...Continue Reading

References

Jul 21, 2006·Nature·Sasha StankovichRodney S Ruoff
Nov 19, 2010·ACS Nano·Mitra Yoonessi, James R Gaier
Jul 13, 2011·ACS Applied Materials & Interfaces·Xian-Yong QiNikhil Koratkar
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Feb 19, 2013·Advanced Materials·Haiyan SunChao Gao
Feb 10, 2016·Scientific Reports·Kate BlackPaul R Chalker
Nov 24, 2017·ACS Applied Materials & Interfaces·Mitra YoonessiMichael A Meador

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