Abstract:We theoretically investigate the microwave absorption properties of hydrogen plasma in iron-catalyzed highpressure disproportionation-grown carbon nanotubes under an external static magnetic field in the frequency range 0.3 GHz to 30 GHz, using the Maxwell equations in conjunction with a general expression for the effective complex permittivity of magnetized plasma known as the Appleton-Hartree formula. The effects of the external static magnetic field intensity and the incident microwave propagation direction… Show more
“…There has been a growing interest in the field of carbon nanotubes [1][2][3][4][5][6][7][8][9][10][11][12][13][14] since they were discovered by Iijima, [15] because of their unique properties and great potential applications. Their most advanced applications include nanoelectronics, hydrogen storage, field-emitters, biological and chemical gas sensors, medicine, nanomaterials, etc.…”
Parametric instabilities induced by the coupling excitation between the high frequency quantum Langmuir waves and the low frequency quantum ion-acoustic waves in single-walled carbon nanotubes are studied with a quantum Zakharov model. By linearizing the quantum hydrodynamic equations, we get the dispersion relations for the high frequency quantum Langmuir wave and the low frequency quantum ion-acoustic wave. Using two-time scale method, we obtain the quantum Zaharov model in the cylindrical coordinates. Decay instability and four-wave instability are discussed in detail. It is shown that the carbon nanotube's radius, the equilibrium discrete azimuthal quantum number, the perturbed discrete azimuthal quantum number, and the quantum parameter all play a crucial role in the instabilities.
“…There has been a growing interest in the field of carbon nanotubes [1][2][3][4][5][6][7][8][9][10][11][12][13][14] since they were discovered by Iijima, [15] because of their unique properties and great potential applications. Their most advanced applications include nanoelectronics, hydrogen storage, field-emitters, biological and chemical gas sensors, medicine, nanomaterials, etc.…”
Parametric instabilities induced by the coupling excitation between the high frequency quantum Langmuir waves and the low frequency quantum ion-acoustic waves in single-walled carbon nanotubes are studied with a quantum Zakharov model. By linearizing the quantum hydrodynamic equations, we get the dispersion relations for the high frequency quantum Langmuir wave and the low frequency quantum ion-acoustic wave. Using two-time scale method, we obtain the quantum Zaharov model in the cylindrical coordinates. Decay instability and four-wave instability are discussed in detail. It is shown that the carbon nanotube's radius, the equilibrium discrete azimuthal quantum number, the perturbed discrete azimuthal quantum number, and the quantum parameter all play a crucial role in the instabilities.
“…Recently, one-dimensional (1D) materials have been widely used as microwave absorbers owing to their large specific areas, high aspect ratios, and strong shape effects. [15][16][17][18][19][20] Shen et al [21] investigated the microwave absorption of the nanocomposite BaFe 12 O 19 /Ni 0.5 Zn 0.5 Fe 2 O 4 microfibers. Their results showed that when the specimen thickness is 3 mm, the minimum reflection loss (RL) reaches −35.5 dB at 12.4 GHz, with a wide absorption bandwidth (RL < −20 dB) from 9.1 to 15.7 GHz.…”
Structures and magnetic properties of transition metal (TM) Fe or Ni monoatomic chains (MACs) encapsulated by a Au (5, 5) nanotube (Fe@Au and Ni@Au) are investigated using the density functional theory (DFT). The calculated results show that both Fe@Au and Ni@Au prefer to adopt ferromagnetic (FM) orders as ground states. In particular, the Fe@Au keeps the magnetic properties of free-standing Fe MAC, indicating that this system may be viewed as a new candidate in electromagnetic devices.
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