Fabrication and densification mechanism of MgO/Graphene composites with LiF as additive

Lü, Nan; He, Gang; Yang, Zhishu; Li, Yong; Li, Jiangtao

doi:10.1016/j.scriptamat.2019.08.033

Cited by 14 publications

(6 citation statements)

References 28 publications

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“…The reduction in grain size witnessed within the composite ceramics was attributed to the pinning phenomenon facilitated by graphene oxide. This mechanism impeded the growth of grains and constrained the movement of boundaries, thereby resulting in the enhancement of microstructural refinement and densification [63]. In comparison with BCZT-based ceramics without graphene oxide, the inclusion of graphene oxide yielded a denser structure, potentially enhancing the composite material's mechanical properties.…”

Section: Microstructure and Fracture Morphologymentioning

confidence: 99%

Microstructure and Biocompatibility of Graphene Oxide/BCZT Composite Ceramics via Fast Hot-Pressed Sintering

Zhao,

Liu,

Tang

et al. 2024

Coatings

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Improving fracture toughness, electrical conductivity, and biocompatibility has consistently presented challenges in the development of artificial bone replacement materials. This paper presents a new strategy for creating high-performance, multifunctional composite ceramic materials by doping graphene oxide (GO), which is known to induce osteoblast differentiation and enhance cell adhesion and proliferation into barium calcium zirconate titanate (BCZT) ceramics that already exhibit good mechanical properties, piezoelectric effects, and low cytotoxicity. Using fast hot-pressed sintering under vacuum conditions, (1 − x)(Ba0.85Ca0.15Zr0.1Ti0.9)O3−xGO (0.2 mol% ≤ x ≤ 0.5 mol%) composite piezoelectric ceramics were successfully synthesized. Experimental results revealed that these composite ceramics exhibited high piezoelectric properties (d33 = 18 pC/N, kp = 62%) and microhardness (173.76 HV0.5), meeting the standards for artificial bone substitutes. Furthermore, the incorporation of graphene oxide significantly reduced the water contact angle and enhanced their wettability. Cell viability tests using Cell Counting Kit-8, alkaline phosphatase staining, and DAPI staining demonstrated that the GO/BCZT composite ceramics were non-cytotoxic and effectively promoted cell proliferation and growth, indicating excellent biocompatibility. Consequently, with their superior mechanical properties, piezoelectric performance, and biocompatibility, GO/BCZT composite ceramics show extensive potential for application in bone defect repair.

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Section: Microstructure and Fracture Morphologymentioning

confidence: 99%

Microstructure and Biocompatibility of Graphene Oxide/BCZT Composite Ceramics via Fast Hot-Pressed Sintering

Zhao,

Liu,

Tang

et al. 2024

Coatings

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“…MgO is an eco‐friendly material with a high melting point, strong thermal shock resistance, high thermal conductivity, good chemical stability to conventional ceramic, and exceptional high‐temperature plasticity 23 . In the meantime, the polarization of the interfacial layer, the mobility hysteresis of the electrons in those dipoles' electric dipoles, and the absorption of electromagnetic waves all play significant roles 24–27 . Consequently, MgO matrix composites with large dimensions and self‐aligned graphene sheets are a good candidate for EMI shielding applications.…”

Section: Introductionmentioning

confidence: 99%

“…23 In the meantime, the polarization of the interfacial layer, the mobility hysteresis of the electrons in those dipoles' electric dipoles, and the absorption of electromagnetic waves all play significant roles. [24][25][26][27] Consequently, MgO matrix composites with large dimensions and self-aligned graphene sheets are a good candidate for EMI shielding applications. When EM radiation was passed through Fe nanoparticles in the MgO matrix, the shielding was excellent because of magnetic and dielectric properties and dispersion, with a maximum SE of À65.6 dB.…”

Section: Introductionmentioning

confidence: 99%

A study to determine electromagnetic interference‐shielding effectiveness on bio‐based polyurethane foam reinforced with PVDF/MgO/Ni for emerging applications

Selvaraj

Subramanian

Jeyamani

et al. 2022

J of Applied Polymer Sci

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The main objective of this study is to prepare nanoparticles‐induced bio‐based polyurethane foam to shield electromagnetic interference (EMI) radiation in the 8–12 GHz frequency range and compare the experimental result with optimization and simulation. Polyvinylidene fluoride (PVDF), magnesium oxide (MgO), and Nickel (Ni) nanoparticles were induced into bio‐based PU (polyurethane) foam through absorption and hydrothermal reduction technique, which includes mechanical stirring, compressing, heating and evaporating. The design of experiment (DOE) methodology was used to find nanoparticle weight percentage (wt%). EMI shielding effectiveness of the bio‐based PU foam composite was measured using Vector Network Analyzer (N5230A PNA‐L). The weight percentages of the optimized sample were predicted using the response surface methodology (RSM), in which the central composite design (CCD) employed the weight percentages of the three nanoparticles as input and the results of the electromagnetic interference shielding effectiveness (EMI SE) experiment as the response output. The result from CCD showed that 3 wt% of PVDF, 10 wt% of MgO, and 1 wt% of Ni gave a maximum EMI SE of 27.78 dB. Then a confirmation sample was created for the same, and EMI SE was estimated empirically. The results obtained for the confirmation sample are 27.56 dB. Then, a scanning electron microscope image was taken for the confirmation sample to analyze nanoparticle‐induced bio‐based PU foam's structural properties. The SEM image with dxf format is imported into the radio frequency (RF) module to calculate the EMI SE through COMSOL Multiphysics. The simulated EMI SE for the confirmation sample was 25.1 dB.

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“…As an environmentally friendly material, MgO possesses a high melting point, high thermal shock resistance, high thermal conductivity, good chemical stability of traditional ceramic, and superior high‐temperature plasticity, 30 which is good for particle rearrangement and graphene orientation at high‐temperature sintering process. Meanwhile, the electric dipole polarization, electron motion hysteresis of those dipoles, and the interfacial polarization play an important role in the absorption of electromagnetic wave 31–35 . Therefore, MgO matrix composites with large size and self‐aligned graphene sheets are promising candidate for EMI shielding application.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, the electric dipole polarization, electron motion hysteresis of those dipoles, and the interfacial polarization play an important role in the absorption of electromagnetic wave. [31][32][33][34][35] Therefore, MgO matrix composites with large size and self-aligned graphene sheets are promising candidate for EMI shielding application.…”

mentioning

confidence: 99%

High electromagnetic interference shielding effectiveness in MgO composites reinforced by aligned graphene platelets

et al. 2021

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Graphene has been considered as an excellent filler to reinforce ceramics with enhanced properties. However, the uniform dispersion and controlled orientation of graphene sheets in a ceramic matrix have become major challenges toward higher performance. In this paper, we prepared MgO matrix composites with parallel graphene layers through the intercalation of the precursor into expandable graphite. We obtained a high electromagnetic interference (EMI) shielding effectiveness of ~30 dB, due to the multiple reflections and absorptance of electromagnetic waves between the parallel graphene layers. The hardness and strength of the MgO composite were also increased by introducing parallel graphene layers. All these properties suggest that the graphene/MgO composite represents a promising electromagnetic shielding material.

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Fabrication and densification mechanism of MgO/Graphene composites with LiF as additive

Cited by 14 publications

References 28 publications

Microstructure and Biocompatibility of Graphene Oxide/BCZT Composite Ceramics via Fast Hot-Pressed Sintering

Microstructure and Biocompatibility of Graphene Oxide/BCZT Composite Ceramics via Fast Hot-Pressed Sintering

A study to determine electromagnetic interference‐shielding effectiveness on bio‐based polyurethane foam reinforced with PVDF/MgO/Ni for emerging applications

High electromagnetic interference shielding effectiveness in MgO composites reinforced by aligned graphene platelets

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