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Saleem, M. R., Muhammad Imran Arshad, and Nasir Amin. Materials Science and Engineering: B 320 (2025): 118440.
Graphene nanoplatelets (GNPs) were used as functional fillers in the preparation of Cd₀.₃₅Zn₀.₆₅Fe₂O₄ (CZF) and Cd₀.₃₅Zn₀.₆₅La₀.₀₃Fe₁.₉₇O₄ (CZLF)/GNPs composites synthesized via the sol-gel auto-combustion (SGAC) method. GNPs were incorporated in varying weight percentages (1.25-5 wt%) to study their influence on the microstructural, electrical, dielectric, and magnetic properties of the resulting spinel ferrite composites.
X-ray diffraction confirmed a face-centered cubic spinel structure with crystallite sizes ranging from 17.94 to 35.32 nm. Uniform GNP dispersion was validated via SEM, TEM, and HRTEM, while Raman spectroscopy confirmed the coexistence of GNPs with the ferrite matrix. Electrical measurements showed a decrease in DC resistivity with increasing temperature, and a minimum activation energy of 0.404 eV was observed in the CZLF/5 wt% GNPs composite.
GNP addition enhanced dielectric behavior and electromagnetic performance. The CZLF/5 wt% GNPs sample exhibited improved dielectric miniaturization (factor of 20.85) and minimal reflection loss (-2.53 × 10⁻⁴ dB) at 8 MHz. Furthermore, the CZLF/3.75 wt% GNPs composite exhibited the lowest skin depth (3.88 × 10⁻⁵ cm), while the highest saturation magnetization (Ms = 9.68 emu/g) was achieved with 2.5 wt% GNPs.
These findings confirm that GNPs significantly modify the structural and functional characteristics of La-doped ferrite composites, making them promising candidates for use in medium-frequency electronic and magnetic devices.
Feng, Chongyang, et al. Journal of Materials Research and Technology 36 (2025): 2863-2873.
Graphene nanoplatelets (GNPs) have been utilized to enhance the anti-penetration performance of Ti/Al₃Ti/Al laminated metal composites (LMCs), offering a promising approach for advanced impact-resistant materials. This study employed molecular dynamics (MD) simulations using LAMMPS to investigate the influence of GNP incorporation at the atomic scale.
Three LMC models were compared: pristine Ti/Al₃Ti/Al, single-layer GNP-reinforced (Ti/Al₃Ti/Al@GNPs1), and double-layer GNP-reinforced (Ti/Al₃Ti/Al@GNPs2). The simulations revealed a strong positive correlation between the number of GNP layers and anti-penetration capability. Upon projectile impact, the peak force increased from 146.1 nN (no GNPs) to 451.1 nN and 478.1 nN for the single and double GNP-layer composites, respectively. Notably, the GNP-reinforced structures induced a rebound effect on the projectile, reversing its velocity after full deceleration.
Mechanistically, the enhancement arises from the lateral redirection of dislocation motion along GNP interfaces, contributing to energy dissipation and structural reinforcement. These atomic-scale effects significantly improve resistance to high-velocity impacts.
This work provides valuable insight into the role of GNPs in laminated composites and highlights their application in next-generation protective materials. The findings are particularly relevant for aerospace, defense, and transport sectors where lightweight, high-strength, and impact-resistant materials are essential.
Dananjaya, Vimukthi, and Chamil Abeykoon. International Journal of Lightweight Materials and Manufacture 8.3 (2025): 374-384.
Graphene nanoplatelets (GNPs) have been employed to reinforce recycled polypropylene (rPP), yielding nanocomposites with significantly improved mechanical, thermal, and electrical performance. This study demonstrates the use of acid-functionalized GNPs to enhance compatibility with the polymer matrix, followed by melt compounding using a twin-screw extruder with GNP loadings ranging from 0 to 20 parts per hundred resin (Phr).
Incorporating GNPs into the rPP matrix markedly increased tensile strength, Young's modulus, and flexural strength by 15.6 MPa, 3.7 MPa, and 2.41 MPa, respectively. Thermal analysis revealed elevated crystallization, melting, and decomposition temperatures-improving by up to 8.36 °C-along with a 221 mW/m·K rise in thermal conductivity. However, impact strength declined by 64.27 J/m and electrical resistivity dropped by 105 Ω·cm, reflecting enhanced conductivity with filler inclusion.
These GNP-rPP composites were prepared using a 16 mm twin-screw extruder at controlled temperature zones (195-200 °C), ensuring homogeneous dispersion. The results underscore GNPs' ability to strengthen recycled polymers, boosting thermal stability and structural integrity while promoting sustainable material reuse.
This work provides critical insights for designing eco-friendly, high-performance polymer composites suitable for automotive, packaging, and consumer goods, aligning with circular economy goals and reducing plastic waste through advanced nanomaterial integration.
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