Synthesis, Structural, Magnetic and High-Frequency Electrical Properties of Mn0.8Zn0.2Fe2O4/Polypyrrole Core–Shell Composite Using Waste Batteries

Synthesis, Characterization and Dye Removal Capability of Conducting Polypyrrole/Mn0.8Zn0.2Fe2O4/Graphite Oxide Ternary Composites

“…The most crucial and obvious point here is that the diffraction pattern is not affected by the compositional ratio even with the smallest percentage of PPy, where its amorphous characteristics become predominant. The two tiny peaks that appeared at 33 and 35.6° could be assigned, as in our previous publication [38], to the most intense peak (311) of the ferrite spinel, and some interactions between PPy and MZF.…”

“…The XRD of PMG composites exhibited only the very broad peak characteristic of PPy, without any indication of the presence of MZF or GO. The disappearance of the ferrite's diffraction peaks [30] could be attributed, as discussed in our previous publication on MZF/PPy composites [38], to the core-shell's formation in which the amorphous PPy shell completely coated the MZF (acted as core). In addition, the obvious disappearance of the (001) characteristic peak of GO indicated the complete exfoliation, accompanied by the coating of the GO stacked layers during the in situ polymerization process of the PPy matrix [28,39].…”

“…The figure shows that all the samples exhibited metallic conductivity and showed constant conductivity with increasing temperature. The obvious decrease in the conductivity, with increasing frequency, could be discussed in view of the inability of charge carriers to rotate themselves with increasing frequencies [38]. The observed decrease in conductivity, over 420 K in PMG composites, indicated the initiation of the chain decomposition of GO as well as PPy [29].…”

“…The small bands observed at 1545 and 1455 cm −1 were assigned to the pyrrole ring's asymmetric and symmetric C=C stretching vibration. The bands that appeared at 1290, 1170, and 1040 cm −1 were assigned to in-plane deformation C-H, while others at 899 and 782 cm −1 were assigned to the out-of-plane deformation [38]. The strong band at 1637 cm −1 for GO could be assigned as the C-O stretching vibration attributed to the graphite oxidation [26].…”

Interface Optimizing Core–Shell PZT@Carbon/Polyurethane Composites with Enhanced Passive Piezoelectric Vibration Damping Performance

“…Interface optimization of piezoelectric fillers is an effective way to subtly address the issue while maintaining control over variables. Interface optimizing has found widespread application in the fields of electric energy storage and light absorption of composites. − Especially for composites, optimizing the interface adhesion is significant for a different matrix of materials bonding into a whole composite. Cai et al indicated that Pb­(Zr x Ti 1– x )­O 3 (PZT) particle surface-treated by an organic agent could optimize the bonding interface with polyvinylidene fluoride (PVDF) polymer matrix.…”