Multifunctional carboxymethyl cellulose nanofiber/liquid metal aerogels for sound absorption and heat insulation
摘要
Functional aerogels have attracted intensive attention due to their large specific surface area and light weight. In this study, liquid metal (LM) was uniformly dispersed into carboxymethyl cellulose nanofiber (CCNF) for fabricating sustainable CCNF/LM aerogel using a freeze-drying method. The as-fabricated CCNF/LM aerogel was characterized to understand its morphology, chemical components, crystal structure and surface structure, and the sound absorption together with thermal insulation of the aerogel were measured. The CCNF/LM aerogel exhibited good sound absorption, which can be attributed to the unique three-dimensional layered structure. Furthermore, the surface temperature of the CCNF/LM aerogel can be effectively decreased due to the heat absorption, reflection, and radiation of liquid metal. This work provides strategies in developing LM-aerogels toward application of in noise reduction and thermal insulation.