Comparison of microwave absorption properties between BaTiO₃/Epoxy and NiFe₂O₄/Epoxy composites

Abstract

Microwave absorption properties of Epoxy/Nickel Ferrite (NiFe2O4) and Epoxy/Barium Titanate (BaTiO3) composites were investigated and compared in the 1–14 GHz. Epoxy/filler particles (NiFe2O4 and BaTiO3) composites were prepared with 85/15 mixture ratios via Ultrasonic Probe Sonicator method in solution. The complex permittivity ( ɛ′‐ ɛ″) and permeability ( μ′‐ μ″) of the composites have been measured at different microwave frequencies in 1–14 GHz via vector network analyzer (Keysight N9926A). The reflection loss (RL) of composites was calculated and evaluated from camplex permitivity and permeability. The obtained results show that both composites exhibit the large RL and broadband within the frequency range from 1 to 14 GHz for different thickness. Epoxy/BaTiO3 showed a better microwave absorption at the range of 6–7.2 GHz for 7 and 6 mm, at the range of 7.4–9.1 GHz for 5 mm. However, the Epoxy/NiFe2O4 exhibits the largest RL and the widest bandwidth than those obtained from Epoxy/BaTiO3 composite. POLYM. COMPOS., 39:E2143–E2148, 2018. © 2017 Society of Plastics Engineers

Characterization and Microwave Absorption Properties of Lead-Free Bi0.5(Na0.80K0.20)0.5TiO3 Synthesized by Sol-Gel Method

“…Therefore, the absorption layer thickness always must satisfy the phase condition or the shift-length effect. Lead-free BNKT has a microwave absorbing performance (-21.72 dB) better than the BaTiO3 nanostructures, typical ferroelectric materials as reported in [19,[29][30][31][32]. The microwave absorption properties of some representative microwave absorption materials are listed in Table 2.…”

Hybrids of glass fibers coated with carbon nanotubes and nickel for high‐performance electromagnetic wave absorption composites

“…One type is surface coating materials, including various absorbing coatings or patch ones, such as carbonaceous fillers (e.g. graphene 6 , carbon nanotube (CNT) 7,8 , carbon black [9][10][11] , dielectric or magnetic materials (e.g. ferrites or titanates), and their hybrids [12][13][14][15][16] .…”

“…According to the processing technology and structural‐load‐carrying capacity, EM absorbers can be divided into two categories. One type is surface coating materials, including various absorbing coatings or patch ones, such as carbonaceous fillers (e.g., graphene, 6 carbon nanotube (CNT), 7,8 carbon black, 9–11 dielectric or magnetic materials (e.g., ferrites or titanates), and their hybrids 12–16 ). The other type is structural EM absorbing materials.…”

Enhancing thermal and dynamic‐mechanical properties of epoxy reinforced by amino‐functionalized microcrystalline cellulose

“…Epoxy resins are considered a high‐performance thermosetting material due to their outstanding mechanical, thermal, and chemical properties compared to resins such as polyester 1 . Aiming to further improve their properties, micro or nanofillers such as carbon nanotubes, 2 clays, 3 aramid pulp, 4 carbonaceous fillers, 5 and metallic particles 6 are incorporated into the resin. In recent years, the increased demand for materials and products of renewable resources has also encouraged the use of natural fillers for composite materials such as cellulose 7 …”