Nanostructured Barium Titanate/Carbon Nanotubes Incorporated Polyaniline as Synergistic Electromagnetic Wave Absorbers

Abstract

The three-dimensional (3D) conductive network structures formed by barium titanate/carbon nanotubes incorporated polyaniline were favorable for strengthening electromagnetic absorption capability. Herein, an easy and flexible method consisting of sol-gel technique, in situ polymerization, and subsequent mechanical method have been developed to prepare the barium titanate/carbon nanotubes incorporated polyaniline (CNTs/BaTiO3/PANI or CBP) ternary composites. The dielectric properties and microwave absorption properties of CNTs/BaTiO3/PANI composites were investigated in the frequency range of 2–18 GHz by vector network analyzer. Interestingly, it is found that the CNTs/BaTiO3/PANI composites with 3D conductive network structures presented outstanding electromagnetic absorption properties, which may be attributed to the high impedance matching behavior and improved dielectric loss ability and novel synergistic effect. Additionally, it also can be supposed that the “geometrical effect” of composite was more beneficial to absorbing the incident electromagnetic wave. The CNTs/BaTiO3/PANI composite (the mass ratio of CNTs/BaTiO3to PANI is 2 : 3) exhibits the best microwave absorption properties, of which the minimum reflection loss value can reach −30.9 dB at 8 GHz and the absorption bandwidth with a reflection loss blew −10 dB ranges from 7.5 to 10.2 GHz.

Improved shellac mediated nanoscale application drug release effect in a gastric-site drug delivery system

“…[1][2][3][4][5] As the nanotechnology has been developed during the decades with several historical breakthroughs, [6][7][8][9][10][11] numerous new applications have been applied to DDSs. [12][13][14] Nanoparticles and nanobers have been widely used in DDSs due to their popular and simple production methods.…”

Recent advancements in the electromagnetic interference shielding performance of nanostructured materials and their nanocomposites: a review

“…429 BaTiO 3 /PANI composite prepared by adding PANI (50 wt%) to BaTiO 3 (BaTiO 3 /PANI wt ratio ¼ 1 : 1) showed the minimum reection loss of À20 dB (23 Hz) and À27 dB (33 GHz). 430 PANI-tetragonal BaTiO 3 , 431 CNT (2 wt%)/BaTiO 3 (34.5 wt%)/ epoxy, 432 BaTiO 3 -CoFe 2 O 4 lled LDPE, 433 graphite nanoplatelets (6 wt%)/BaTiO 3 (30 wt%)/epoxy, 434 NiO@SiO 2 (15 wt%)/PVDF, 435 EPDM/BaTiO 3 (20 phr)/MWCNT (10 phr), 436 tetragonal BaTiO 3 (80 phr)/NBR, 437 CNT/BaTiO 3 /polyaniline, 438 445 and PANI/TiO 2 /g-Fe 2 O 3 , 446 have also been studied for their EMI shielding efficiencies.…”

Electromagnetic wave-absorbing properties of graphene nanoplatelets - calcium sulfoaluminate cement - based composites

“…From these results it is clear that the composite with 0.06% GNPs shows good absorbing property. Increasin g the con- According to absorbing mechanism, there are two major types of absorbers: magnetic loss (36, 37) and dielectric loss (38)(39)(40). As a kind of dielectri c loss material, GNPs has large specifi c surface area, this is prone to multiple scattering.…”