▎ 摘　　要

NOVELTY - Preparing reduced graphene oxide/aramid nanofiber composite aerogel comprises e.g. (i) placing graphene oxide powder in deionized water for ultrasonic treatment to obtain uniformly dispersed graphene oxide dispersion, adding sodium bisulfite into the graphene oxide dispersion, and performing centrifugation to obtain precipitate, rinsing precipitate, collecting precipitate and adding deionized water to carry out ultrasonic layering to obtain reduced graphene oxide suspension, (ii) mixing aramid fiber, potassium hydroxide, dimethyl sulfoxide and deionized water, and magnetically stirring, dispersing aramid nano-suspension into deionized water, stirring, sieving aramid nanofiber solution and rinsing with deionized water to form aramid nanofiber gel after filtration, and (iii) mixing reduced graphene oxide suspension with aramid nanofiber gel, ultrasonically treating to make it evenly mixed to obtain reduced graphene oxide/aramid nanofiber composite gel, pre-freezing and freeze-drying. USE - The reduced graphene oxide/aramid nanofiber composite aerogel is useful for electromagnetic shielding (claimed); and in communications, microelectronics and aerospace. ADVANTAGE - The method has simple operation, easy operation and mild reaction conditions. The reduced graphene oxide/aramid nanofiber composite aerogel has both excellent mechanical properties and excellent electromagnetic shielding properties. DETAILED DESCRIPTION - Preparing reduced graphene oxide/aramid nanofiber composite aerogel comprises (i) placing graphene oxide powder in deionized water for ultrasonic treatment to obtain uniformly dispersed graphene oxide dispersion, adding sodium bisulfite into the graphene oxide dispersion, heating and stirring, then cooling to room temperature and performing centrifugation to obtain precipitate, rinsing precipitate, collecting precipitate and adding deionized water to carry out ultrasonic layering to obtain reduced graphene oxide suspension, (ii) mixing aramid fiber, potassium hydroxide, dimethyl sulfoxide and deionized water, and magnetically stirring to obtain aramid nano-suspension, dispersing aramid nano-suspension into deionized water, stirring to make it evenly dispersed to obtain aramid nano-fiber solution, sieving aramid nanofiber solution and rinsing with deionized water to form aramid nanofiber gel after filtration, and (iii) mixing reduced graphene oxide suspension with aramid nanofiber gel, ultrasonically treating to make it evenly mixed to obtain reduced graphene oxide/aramid nanofiber composite gel, pre-freezing and freeze-drying to obtain reduced graphene oxide/aramid nanofiber composite aerogel.