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A study of the oxidation of ultrafine powder of activated aluminum with water to form an IR-opaque aerosol

Content Provider	Springer Nature Link
Author	Kumpanenko, I. V. Roshchin, A. V. Bloshenko, A. V. Sakharova, N. A. Ivava, N. A.
Copyright Year	2015
Abstract	The reaction of oxidation of ultrafine powder of activated aluminum (UFPAA) with water is studied. Activated aluminum is meant to be a juvenile aluminum powder coated with a water-soluble polymer film (polyethylene oxide). When exposed to water, the polymer film dissolves, allowing metallic aluminum to react with water. A method of preparation of UFPAA using a ball mill is described. The reactions of UFPAA with water in closedand open-type reactors are investigated. For the closed-type reactor, the effect of the initial amount of UFPAA and of the Al-to-H$_{2}$O ratio on the temperature and pressure of the process, as well as the composition of the solid and gaseous reaction products, are determined. It is found that, at a UFPAA sample weight of ≥100 g, the temperature and pressure of the reaction increase above the critical values for water (T = 374.2°C, P = 22.14 MPa). The open-type reactor is demonstrated to produce aerosol. It is shown that, the reaction of 100 g of initial UFPAA with water at Al-to-H$_{2}$O ratios ranging from 1: 1 to 1: 5 produces aerosol particles containing aluminum in concentrations C $_{Al}$ from 13 to 18 wt %. The dependence of the masking ability of aerosols (M $_{Δλ}$) in the IR region of the electromagnetic radiation (Δλ = 3–14 μm) on C $_{Al}$ is measured. The M $_{Δλ}$(C $_{Al}$) dependence is a monotonically increasing function, with the maximum, M $_{Δλ}$ = 1.9 m$^{2}$/g, reached at C $_{Al}$ = 18 wt %.
Starting Page	658
Ending Page	666
Page Count	9
File Format	PDF
ISSN	19907931
Journal	Russian Journal of Physical Chemistry B
Volume Number	9
Issue Number	4
e-ISSN	19907923
Language	English
Publisher	Pleiades Publishing
Publisher Date	2015-09-27
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	activated aluminum ultrafine powder reaction with water aerosol formation masking ability in the IR region Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry

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