Sodium alginate aerogel derived SiC@Co-C 3D network enhances electromagnetic wave absorption and thermal conductivity
Lilin Xiang1, Duo Pan1, Junting Lei1
1Key Laboratory of Materials Processing and Mold (Zhengzhou University), Ministry of Education, National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou 450002, China.
Abstract:
Interface packaging materials with both electromagnetic wave absorption and high thermal conductivity remains a research hotspot in modern electronics industry and aerospace field. In this paper, the cobalt alginate aerogel derived from biomass sodium alginate was carbothermal reduced to obtain a three-dimensional skeleton structure composed of zero-dimensional Co metal particles, one-dimensional silicon carbide (SiC) whiskers and biomass derived carbon (C). The dielectric-electromagnetic effect of the filler network makes the obtained polydimethylsiloxane (PDMS) based composite (PDMS/SiC@Co-C) exhibits good electromagnetic wave absorption performance, with the lowest reflection loss (RLmin) value can reach -40.08 dB, and the effective absorption bandwidth (EABmax) can reach 4.16 GHz at the thickness of 1.9 mm. The unique three-dimensional overlapping structure makes the thermal conductivity of PDMS/SiC@Co-C increase to 1.856 W/m·K, which is 1345 % higher than that of PDMS. This work provides an important reference value for the development of interface packaging materials used in microelectronics and aerospace fields.
