Ultralight Polymer-Derived Ceramic Aerogels With Wide Bandwidth And Effective Electromagnetic Absorption Properties

Keywords

Electromagnetic absorption properties; Polymer-derived ceramic aerogel; Ultralight

Abstract

In this work, ultralight polymer-derived ceramic aerogels (PDCA) were prepared by a facile method of hydrosilylation crosslink and freeze drying. The electromagnetic absorption properties of ultralight PDCA were investigated for the first time. The PDCA pyrolyzed at 1000 °C shows a uniform three-dimensional (3D) framework with a low bulk density of ∼0.19 g/cm3 and high surface area of 134.48 m2/g. The electromagnetic properties of PDCA were characterized by a vector network analyzer. The minimum reflection and absorption bandwidth of PDCA pyrolyzed at 1000 °C, 1200 °C and 1400 °C are −43.37 dB @ 7.6 GHz, −42.01 dB@12.5 GHz, and −31.69 dB@17.3 GHz and 3.8 GHz, 6.6 GHz and 4.2 GHz, respectively, at the frequency range of 2–18 GHz. The strong electromagnetic absorption and wide bandwidth features of PDCA could be attributed to the multiple reflections of microwaves in the 3D framework, as well as the high dielectric loss and proper conductivity.

Publication Date

10-1-2017

Publication Title

Journal of the European Ceramic Society

Volume

37

Issue

13

Number of Pages

3973-3980

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.jeurceramsoc.2017.04.068

Socpus ID

85018976410 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85018976410

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