Effect of High Magnetic Pulse Iteration on Electrical Property of CNT-Polypyrrole Composite: Alignment Mechanism

Kazemikia, Kaveh; Bonabi, Fahimeh; Asadpoorchallo, Ali; Shokrzadeh, Majid

doi:10.1007/s10948-018-4560-8

Cited by 2 publications

(2 citation statements)

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“…Investigations into the orientation movement of FCI particles have demonstrated that, due to their magnetic anisotropy, when subjected to a magnetic field, their easy magnetization axis will rotate toward the magnetic field direction until it aligns parallel to it. The magnetic torque induced by the magnetic force acting on the FCI particles can be computed as follows In eq , M is the magnetization, B is the magnetic flux density, χ ⊥ and χ ∥ are the vertical magnetic susceptibility and parallel magnetic susceptibility of the FCI, respectively, H ⊥ = H sin θ and H ∥ = H cos θ are the components of the magnetic field intensity perpendicular to and parallel to the long axis of the FCI particles, respectively, and θ is the included angle between the easy magnetization axis and magnetic field direction.…”

Section: Resultsmentioning

confidence: 99%

“…Investigations into the orientation movement of FCI particles have demonstrated that, due to their magnetic anisotropy, when subjected to a magnetic field, their easy magnetization axis will rotate toward the magnetic field direction until it aligns parallel to it. The magnetic torque induced by the magnetic force acting on the FCI particles can be computed as follows .25ex2ex bold-italicT normalH = bold-italicM × bold-italicB = μ 0 bold-italicM × ( H + M ) = μ 0 bold-italicM × bold-italicH = μ 0 ( χ ⊥ H ⊥ + χ P H P ) × ( H ⊥ + H P ) = μ 0 ( χ ⊥ − χ P ) bold-italicH ⊥ × bold-italicH normalP In eq , M is the magnetization, B is the magnetic flux density, χ ⊥ and χ ∥ are the vertical magnetic susceptibility and parallel magnetic susceptibility of the FCI, respectively, H ⊥ = H sin θ and H ∥ = H cos θ ar...…”

Section: Resultsmentioning

confidence: 99%

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Fabrication of Flexible FCI/PDMS Electromagnetic Shielding Composites Based on Pulsed Magnetic Field-Induced Alignment

Zhu

Chen

et al. 2023

ACS Appl. Electron. Mater.

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Conductive polymer composites have been utilized in the field of electromagnetic interference (EMI) shielding, albeit requiring a high concentration of conductive fillers to achieve desirable EMI performance. To address this issue and enable the creation of superior EMI shielding composites with reduced filler loadings, this study employed a pulsed magnetic field featuring an amplitude of 0.7 T, a pulse width of 10 μs, and a frequency of 100 Hz to align flaky carbonyl iron (FCI) in poly(dimethylsiloxane) (PDMS). This method resulted in an improved EMI shielding performance of the composites. The outcomes revealed that the pulsed magnetic field effectively controlled the orientation of the FCI, forming a conductive network structure, with the average orientation angle of the FCI reaching 69.3°. The aligned composites exhibited a significant improvement in EMI shielding effectiveness, with the enhancement effect reaching 37.53% and the EMI shielding effectiveness reaching 24.87 dB. Moreover, the flexible tensile properties of the aligned composites were superior to those of the unaligned composites, particularly the elongation at break, which reached 197.46%. The concordance between the theoretical analysis and experimental results affirms the efficacy of the microsecond pulsed magnetic field in enhancing the EMI shielding performance of composite materials. Ultimately, the high-performance, flexible electromagnetic shielding composite materials prepared in this study demonstrate potential for use in advanced electronic equipment.

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Section: Resultsmentioning

confidence: 99%

“…Investigations into the orientation movement of FCI particles have demonstrated that, due to their magnetic anisotropy, when subjected to a magnetic field, their easy magnetization axis will rotate toward the magnetic field direction until it aligns parallel to it. The magnetic torque induced by the magnetic force acting on the FCI particles can be computed as follows .25ex2ex bold-italicT normalH = bold-italicM × bold-italicB = μ 0 bold-italicM × ( H + M ) = μ 0 bold-italicM × bold-italicH = μ 0 ( χ ⊥ H ⊥ + χ P H P ) × ( H ⊥ + H P ) = μ 0 ( χ ⊥ − χ P ) bold-italicH ⊥ × bold-italicH normalP In eq , M is the magnetization, B is the magnetic flux density, χ ⊥ and χ ∥ are the vertical magnetic susceptibility and parallel magnetic susceptibility of the FCI, respectively, H ⊥ = H sin θ and H ∥ = H cos θ ar...…”

Section: Resultsmentioning

confidence: 99%