A versatile foaming platform to fabricate polymer/carbon composites with high dielectric permittivity and ultra-low dielectric loss

Abstract

A microcellular structure can effectively tune the dielectric properties of PVDF/carbon composite foams.

Room-Temperature Ferromagnetic Sr3YCo4O10+δ and Carbon Black-Reinforced Polyvinylidenefluoride Composites toward High-Performance Electromagnetic Interference Shielding

“…42,43 The decreasing permittivity with frequency is because at high frequencies, the polarizations cannot follow the variations in the applied EM signal. 44 In this case, the permittivity of PC is higher than that of PVDF with 10 wt % of CB because the former has more content of polar phases and conductivity than that of latter (Figure S4). In the case of PCS composites, PCS-10 has high relative permittivity than that of other composites as it contains more amount of polar phases, which is evident from FTIR and less agglomeration compared to other composites as evident from SEM images.…”

Polymer Grafted Aluminum Nanoparticles for Percolative Composite Films with Enhanced Compatibility

“…Because the oxide shell of iso -Al NPs@PS was thinner than that of agg -Al NPs, the film was closer to a percolative system. However, the isolated Al NPs-PS composite films are still highly insulating, since the electric conductivity of the composite exhibits strong dependence on the frequency [57]. The conductivity did not vary with the filler loading of Al NPs, which suggests the similarity of the polarization property between Al NPs and PS film.…”

Enhancement of electromagnetic interference shielding from the synergism between Cu@Ni nanorods and carbon materials in flexible composite films

“…Accordingly, incorporation of nanofillers is favorable to accumulate each single fundamental property in a solitaire composite for promoting the EMI shielding performance [26]. Based on our previous studies on ternary-phase CPCs containing CNT/graphene [27,28] and monometallic Ni [29], the conduction and dielectric loss could be achieved from the carbonaceous nanofillers [30], while magnetic loss could be primarily introduced from the magnetic ferrites and metals. Therefore, CPCs containing magnetic metals and carbonaceous nanofillers, correspondingly acting as a metal-carbon ternary/quaternary or even more phases composites, can be realistic EMI shielding materials because of the combination of the magnetic loss (magnetic domain movement, spin resonance and relaxation of magnetization) and conduction loss (Ohmic loss and dielectric conductivity loss) [31].…”