Abstract
ZrO2 nanofiber aerogels with carbon as fiber junction were fabricated by freeze drying. The effects of resorcinol-formaldehyde (RF) content and fiber content on the pore structure, thermal property and compressive property of ZrO2/C nanofiber aerogels were systematically investigated. ZrO2/C nanofiber aerogels have ultra-high porosity above 99.4%, and possess hierarchical pore structure with honeycomb pores in the micro-scale and minor pores in the nano-scale. Both RF content and fiber content have effects on the porosity, thermal conductivity and plateau stress of ZrO2/C nanofiber aerogels. Thermal conductivity is in the range of 0.0332–0.036 W·m−1·K−1. With the increase in RF content or fiber content, both thermal conductivity and plateau stress increase. The thermal transfer mode and compressive deformation mode were analyzed. Fiber junctions play a significant role during the thermal transfer and compression of ZrO2/C nanofiber aerogels.
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