Abstract
The well-designed composite with satisfactory electromagnetic microwave absorption at high temper-atures remains a serious challenge.Herein,we fabricated a resorcinol-formaldehyde/silica dioxide composite aerogel(RF/SiO2)with a three-dimensional network structure using sol-gel,atmospheric pressure drying technique as well as heat-treated processes to achieve enhanced microwave absorption capabilities in the low frequency range.The pristine RF/SiO2 aerogel presented a typical micropores structure with a surface area,porous volume,and density of 146.82 m2/g,62.40％,and 0.28 cm3/g,respectively.Remarkably,the RF/SiO2 aerogel showed an effective absorption bandwidth of 3.56 GHz and a minimum reflection loss value of-46.10 dB at 2.25 mm after being heat-treated at 1500 ℃,while the maximum effective absorption bandwidth was 3.60 GHz at 2.30 mm.The intricate three-dimensional networks possessed remarkable impedance matching,multiple attenuation mechanisms,interfacial polarization,and dielectric loss,which were attributed to the exceptional ability to absorb electro-magnetic microwaves.It offered a fresh approach to creating adaptable and effective microwave ab-sorption materials in military defense.
基金项目
中央高校基本科研业务费专项(D5000210522)
中央高校基本科研业务费专项(D5000210517)
中国博士后科学基金(2021M702665)
陕西省自然科学基金(2022JQ-482)
陕西省自然科学基金(2023-JC-QN-0380)
Guangdong Basic and Applied Basic Research Foundation(2021A1515111155)
Guangdong Basic and Applied Basic Research Foundation(2022A1515111200)
Guangdong Basic and Applied Basic Research Foundation(2022A1515011191)
Basic Research Programs of Taicang(TC2021JC01)
Basic Research Programs of Taicang(TC2021JC21)
Basic Research Programs of Taicang(TC2022JC08)
万方数据