Chemomagnetic characterization of chemical reactions using High-Tc SQUIDs

Claycomb, J. R.; LeGrand, Wanda; Miller, John H.; Nersesyan, M. D.; Ritchie, J. T.; Luss, Dan

doi:10.1016/s0921-4534(00)01433-7

Cited by 6 publications

(11 citation statements)

References 7 publications

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“…Recent experiments revealed that high‐temperature oxidation of metal particles may generate a temporary voltage of the order of 1 V 1–6. The mechanism leading to the formation of this transient electrical field is not yet established.…”

Section: Introductionmentioning

confidence: 99%

“…This approach is adequate for low‐temperature oxidation for which the oxidation proceeds at a quasi steady‐state and its characteristic time is of the order of hours and days15–18. These models do not explain the electric field generation during a fast, high‐temperature combustion, the characteristic time of which is of the order of a second or less19–24, 1–4.…”

Section: Introductionmentioning

confidence: 99%

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High‐temperature oxidation of a metal particle: Nonisothermal model

Filimonov

Luss

2005

AIChE Journal

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High‐temperature oxidation of a metal particle: Nonisothermal model

Filimonov

Luss

2005

AIChE Journal

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“…Owing to re-grouping of domains in the sample, a rather powerful (≈10 µT) residual field is formed, which is independent of the sample orientation in the magnetic field of the Earth. The use of a highly sensitive superconducting quantum interference device (SQID) made it possible to find [11][12][13][14] extremely weak (≈20 nT) magnetic signals directly in the course of synthesis of various oxides. The principal difference in synthesis of non-ferromagnetic and ferromagnetic materials was found [11,12,14]: the magnetic field completely disappears when the afterburning processes are completed.…”

Section: Generation Of Magnetic Fieldsmentioning

confidence: 99%

“…The use of a highly sensitive superconducting quantum interference device (SQID) made it possible to find [11][12][13][14] extremely weak (≈20 nT) magnetic signals directly in the course of synthesis of various oxides. The principal difference in synthesis of non-ferromagnetic and ferromagnetic materials was found [11,12,14]: the magnetic field completely disappears when the afterburning processes are completed. High-temperature synthesis of ferrites can involve generation of rather strong residual magnetic fields (≈2 µT) under significant cooling, which reduces the temperature of products during the synthesis below the Curie point.…”

Section: Generation Of Magnetic Fieldsmentioning

confidence: 99%

High-Temperature Combustion Synthesis: Generation of Electromagnetic Radiation and the Effect of External Electromagnetic Fields (Review)

Filimonov

Kidin

2005

Combust Explos Shock Waves

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A critical review of recent papers on mechanisms of generation of internal electromagnetic fields and the action of external electromagnetic fields on self-propagating high-temperature synthesis of heterogeneous systems is presented. Generation of an internal electromagnetic field is caused by different rates of diffusion of charged defects through the layer of the growing product in strongly nonequilibrium reactions. Possible emergence of residual magnetic fields is related to orientation of magnetic domains in the arising internal thermal and electromagnetic fields of the synthesis wave. The external electromagnetic action is characterized by thermal, magneto-and electrodynamic, and kinetic factors. The thermal factor is caused by the Joule effect, whereas the electro-and magnetodynamic influence is caused by electromigration, magnetic compression and changes in electrical conductivity of the condensed phase, and ion wind in the gas in pores. The kinetic factor is caused by generation of superequilibrium charge carriers in condensed particles (defects) and by emission of high-energy electrons into the gas surrounding the particles.

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“…[1][2][3][4][5][6][7][8][9][10] Electrical and magnetic fields have been detected during both oxidation [1][2][3][4][5] and nitridation of pure metal particles. [1][2][3][4][5][6][7][8][9][10] Electrical and magnetic fields have been detected during both oxidation [1][2][3][4][5] and nitridation of pure metal particles.…”

Section: Introductionmentioning

confidence: 99%

Electrical pulse formation during high temperature reaction between Ni and Al

Setoodeh

Martirosyan

Luss

2006

Journal of Applied Physics

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Articles you may be interested inThe role of microstructure refinement on the impact ignition and combustion behavior of mechanically activated Ni/Al reactive composites A new experimental setup for the time resolved x-ray diffraction study of self-propagating high-temperature synthesis Rev. Sci. Instrum. 73, 422 (2002);An electric voltage pulse ͑duration of about 2 ms͒ with an amplitude of up to 0.6 V was generated during the reaction between nickel and aluminum powders by a high temperature moving reaction front. The electrical signal formed during the initial stages of the combustion was annihilated before the moving front attained its maximum temperature. The voltage amplitude and combustion temperature depended on the particle size of the reactants as well as the Al to Ni ratio in the reactant mixture, and their largest values were attained for a mixture containing 27-31.5 wt % Al. The combustion temperature increased when smaller Al particles were used. The electric signals annihilated either due to the growth of the initially formed product layer and/or as a result of the formation of a molten Al matrix as the reaction propagated. Oscillatory signals formed during unstable combustion in which the reaction front was perturbed. Unipolar and nonoscillating signals formed when the combustion front was planar. We conjecture that the electric field was generated by the different diffusion rates of charge carriers through a reaction generated thin exterior intermediate products shell of Al 3 Ni/ Al 3 Ni 2 .

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Chemomagnetic characterization of chemical reactions using High-Tc SQUIDs

Cited by 6 publications

References 7 publications

High‐temperature oxidation of a metal particle: Nonisothermal model

High‐temperature oxidation of a metal particle: Nonisothermal model

High-Temperature Combustion Synthesis: Generation of Electromagnetic Radiation and the Effect of External Electromagnetic Fields (Review)

Electrical pulse formation during high temperature reaction between Ni and Al

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