Surface-plasmon-like modes of graphite powder compact in microwave heating

Kashimura, Keiichiro; Suzuki, Shohgo; Hayashi, Miyuki; Mitani, Tomohiko; Shinohara, Naoki; Nagata, Kazuhiro

doi:10.1063/1.4745871

Cited by 14 publications

(6 citation statements)

References 18 publications

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“…Such pulsed electrical stimulation of AFM‐based fishing is possibly conditioned by a local increase of electric field gradient and induced magnetic field on HOPG in the vicinity of the mica surface. The effect of increasing electric field gradient can lead to possible excitations of plasmons in graphite, constituting the layers of highly conductive graphene flakes , and eddy currents can also be generated on the graphite surface . Besides, it should be noted that dielectric properties of the mica surface in the mica–graphite structure in their turn can influence the possibility of plasmon generation, and also change due to the changes in water structure on the surface of mica with immobilized probe molecules, as well as other electrokinetic effects.…”

Section: Discussionmentioning

confidence: 99%

Highly sensitive protein detection by biospecific AFM‐based fishing with pulsed electrical stimulation

et al. 2017

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We report here the highly sensitive detection of protein in solution at concentrations from 10 –15 to 10 –18 m using the combination of atomic force microscopy ( AFM ) and mass spectrometry. Biospecific detection of biotinylated bovine serum albumin was carried out by fishing out the protein onto the surface of AFM chips with immobilized avidin, which determined the specificity of the analysis. Electrical stimulation was applied to enhance the fishing efficiency. A high sensitivity of detection was achieved by application of nanosecond electric pulses to highly oriented pyrolytic graphite placed under the AFM chip. A peristaltic pump‐based flow system, which is widely used in routine bioanalytical assays, was employed throughout the analysis. These results hold promise for the development of highly sensitive protein detection methods using nanosensor devices.

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Section: Discussionmentioning

confidence: 99%

Highly sensitive protein detection by biospecific AFM‐based fishing with pulsed electrical stimulation

et al. 2017

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“…Tanaka et al have theoretically showed the mechanism of the rapid and selective heating of Fe 3 O 4 powders based on the magnetic loss. On the other hand, some of the authors have revealed that graphite powders are equally heated in the E field with in the H field . Therefore, the characteristic heating behavior of (i) is considered to be due to the magnetic loss of Fe 3 O 4 powders.…”

Section: Discussionmentioning

confidence: 99%

XRD In Situ Observation of Carbothermic Reduction of Magnetite Powder in Microwave Electric and Magnetic Fields

Sabelström

Hayashi

Yokoyama

et al. 2013

steel research int.

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Recently, microwave energy is expected to be a heat source for high temperature process aiming at CO2 reduction and energy conservation owing to the possibility of volumetric and selective heating. In order to examine the applicability of microwave heating to ironmaking, a basic research may be required with respect to the heating mechanism of raw and product materials of ironmaking as well as the carbothermic reduction mechanism of iron ore. To carry out this research, the authors have developed a single mode microwave furnace combined with X‐ray diffraction analysis. By using this, the authors have elucidated the effects of electric and magnetic fields of microwave on carbothermic reduction of magnetite powders, and have observed the selective heating of materials. It has been found that the Fe3O4–C mixed powders are more rapidly heated by the magnetic field than by the electric field just after the onset of heating. The rapid heating owing to the magnetic field is associated with the magnetic loss of Fe3O4 powders. With respect to the magnetic field heating, once the temperature increases up to 800–1000°C, the temperature does not increase and the reduction hardly progresses, which may stem from the decrement in the microwave absorption of the sample. The main heat source is C at this stage. On the other hand, temperature monotonically increases up to around 1000°C and reaction gradually progresses for the electric field heating. It is considered that the main energy absorber is C at the beginning, and then is possibly changed to FeO at elevated temperatures.

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“…Ignatenko et al have previously reported that when considering the energy loss of these materials in a MW field, it is not possible to ignore the effect of the magnetic component and still achieve a good correlation between the analytical solution and experimental results [21,22]. Assuming that their theory and experimental results are indeed correct, it is the combined effect of the magnetic field and high temperature that influences the electrical conductivity and particle radius of Ni 1 À y O powders, and thus, determines the overall shape effect.…”

Section: Influence Of Particle Shape On Mw Absorptionmentioning

confidence: 93%

Temperature dependence and shape effect in high-temperature microwave heating of nickel oxide powders

Sugawara

Kashimura

Hayashi

et al. 2015

Physica B: Condensed Matter

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a b s t r a c tThe temperature dependence of microwave absorption was investigated for Ni 1 À y O particles over the frequency range 2.0-13.5 GHz and temperature range 25-1000°C. Using a coaxial transmission line method with a network analyzer, both the real and imaginary parts of the relative permittivity (ε′ r and ε″ r , respectively) and permeability (μ′ r and μ″ r , respectively) were measured; finding that both are largely dependent on the temperature at all frequencies. Furthermore, permeability loss factors related to shape effects were observed at high frequencies, indicating an increase in the microwave-absorption properties. A modified form of Mie's theory was applied to discuss these effects, wherein a spherical model demonstrating a close fit to the shape effect data suggests a more complex microwave-absorption behavior at increased temperature.

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Surface-plasmon-like modes of graphite powder compact in microwave heating

Cited by 14 publications

References 18 publications

Highly sensitive protein detection by biospecific AFM‐based fishing with pulsed electrical stimulation

Highly sensitive protein detection by biospecific AFM‐based fishing with pulsed electrical stimulation

XRD In Situ Observation of Carbothermic Reduction of Magnetite Powder in Microwave Electric and Magnetic Fields

Temperature dependence and shape effect in high-temperature microwave heating of nickel oxide powders

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