Reaction kinetics of nanometric aluminum and iodine pentoxide

Farley, Cory; Pantoya, Michelle L.

doi:10.1007/s10973-010-0915-5

Cited by 66 publications

(45 citation statements)

References 10 publications

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“…In Ref. [121] reaction onset detected at 10 K/min for AleI 2 O 5 is reported at a much lower temperature, 582 K; however, the measurements were severely affected by endothermic decomposition of I 2 O 5 . This decomposition is not mentioned in Ref.…”

Section: Thermites Using Nano-sized Aluminum Powdersmentioning

confidence: 93%

Correlating ignition mechanisms of aluminum-based reactive materials with thermoanalytical measurements

Dreizin

Schoenitz

2015

Progress in Energy and Combustion Science

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Section: Thermites Using Nano-sized Aluminum Powdersmentioning

confidence: 93%

Correlating ignition mechanisms of aluminum-based reactive materials with thermoanalytical measurements

Dreizin

Schoenitz

2015

Progress in Energy and Combustion Science

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“…Their analysis indicated the PIR reaction was between the alumina shell surrounding an aluminum core particle with fluorine from decomposing fluoropolymer 19,20 . Farley et al 4 then extended observations of the PIR to aluminumalumina core-shell particles reacting with iodine based oxidizers. The Al + commercial I 2 O 5 sample has an endotherm at 210 °C indicating HI 3 O 8 presence and a mild PIR exotherm with delayed onset temperature.…”

Section: Preparation Of Flame Tubesmentioning

confidence: 98%

“…There are many iodine oxide compounds (e.g., HIO 3 , HI 3 O 8 , I 2 O 5 , I 4 O 9 ) but the one most commonly studied for reaction with aluminum (Al) is diiodide pentoxide, I 2 O 5 [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] . There are reasons for favoring I 2 O 5 for combustion with Al: (1) I 2 O 5 has an oxidation state of five which makes it a strong oxidizer for combustion applications; (2) I 2 O 5 is semi-stable, depending on atmospheric conditions, and easily handled in powder form; and (3) I 2 O 5 is relatively easy to produce and readily available.…”

Section: Introductionmentioning

confidence: 99%

Reaction Kinetics and Combustion Dynamics of I<sub>4</sub>O<sub>9 </sub>and Aluminum Mixtures

Smith

Pantoya

Parkey

et al. 2016

JoVE

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Tetraiodine nonoxide (I 4 O 9 ) has been synthesized using a dry approach that combines elemental oxygen and iodine without the introduction of hydrated species. The synthesis approach inhibits the topochemical effect promoting rapid hydration when exposed to the relative humidity of ambient air. This stable, amorphous, nano-particle material was analyzed using differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA) and showed an exothermic energy release at low temperature (i.e., 180 °C) for the transformation of I 4 O 9 into I 2 O 5 . This additional exothermic energy release contributes to an increase in overall reactivity of I 4 O 9 when dry mixed with nano-aluminum (Al) powder, resulting in a minimum of 150% increase in flame speed compared to Al + I 2 O 5 . This study shows that as an oxidizer, I 4 O 9 has more reactive potential than other forms of iodine(V) oxide when combined with Al, especially if I 4 O 9 can be passivated to inhibit absorption of water from its surrounding environment.

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“…Certain applications, however, such as chemical time delays [14] or neutralisation of chemical and biological agents [15], require that the reaction be sustained over long durations or that it exhibits a small velocity of self-propagation. This could be achieved either by increasing the bilayer thickness or increasing the foil length.…”

Section: Introductionmentioning

confidence: 99%

Regime of validity of a spatially homogenised reaction model for multilayered particles

Alawieh

Weihs

Knio

2015

Combustion Theory and Modelling

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Numerical investigation of self-propagating reaction fronts in a network of Ni/Al nanolayered particles is conducted using the generalised reduced continuum model developed by Alawieh, Weihs and Knio [Combustion and Flame, Vol. 160, No. 9 (2013), pp. 1857-1869. However, due to the high dimensionality and the high computational costs associated with simulating such systems, a further reduction of the model is sought through identifying regimes under which spatial homogenisation at the particle level would be valid. The limiting case of a single chain of particles with no porosity is considered, and comparisons between the computational results of the heterogeneous and the homogeneous reduced model descriptions are carried out. These enable us to determine a narrow region where the homogeneous particle approximation is valid, based on a criterion composed of the non-dimensional ratio of the particle's internal thermal resistance to its thermal contact resistance. We demonstrate that the validity of the homogeneous approximation may hold even for layered particles whose size is almost an order of magnitude larger than the thermal width of a reaction front steadily propagating in a uniform foil. The computations also show that the velocity of the front in the particle compact exhibits large variations as the thermal contact resistance is varied, which would offer the possibility of controlling reaction speed and ignition properties.

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Reaction kinetics of nanometric aluminum and iodine pentoxide

Cited by 66 publications

References 10 publications

Correlating ignition mechanisms of aluminum-based reactive materials with thermoanalytical measurements

Correlating ignition mechanisms of aluminum-based reactive materials with thermoanalytical measurements

Reaction Kinetics and Combustion Dynamics of I<sub>4</sub>O<sub>9 </sub>and Aluminum Mixtures

Regime of validity of a spatially homogenised reaction model for multilayered particles

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