Dynamic measurements of electrical conductivity in metastable intermolecular composites

Abstract

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Metal-based reactive nanomaterials

“…These properties are most likely changing dramatically as the propagating flame heats up the sample and/or as the sample is compressed by the pressure wave generated by the flame front. The magnitude of such changes is likely comparable to that observed for the electrical properties of the nanocomposite mixtures affected by the flame propagation [206]. Simplified heat transfer models for flame propagation in confined and unconfined nanocomposite materials are offered in Refs.…”

“…19 [204]. In a related study, electrical conductivity was measured for a burning a nanocomposite sample partially confined between two brass electrodes [206]. Electrical contacts were used to measure the flame propagation speed in nanocomposite aluminum-Teflon Ò materials prepared by mechanical milling [127][128][129] and placed in channels at relatively low densities (typically under 50% TMD).…”

Electrical conductivity distributions in detonating low-density explosives – Grain size effect

“…The key idea was to use the electric field perpendicular to the conductivity gradient [6] to minimize parasite current spreading and distortions caused by space charge (which were first discussed in [5]). In later works the method was improved and applied to the detonation of high-density explosives [7][8][9] and to metastable intermolecular composites [10]. The measurement procedure is discussed in length in [8,9].…”

Transient ion ejection during nanocomposite thermite reactions

“…Only a few studies report on ionization phenomena in nanocomposite thermites. Douglas et al 24 took a similar approach to Ershov's work and studied the electrical conductivity induced by nanocomposite thermite reactions. Their work showed that a conduction zone was observed in the reaction front and that the conductivity profile was much longer than organic high explosives.…”