Titanium enhanced ignition and combustion of Al/I2O5 mesoparticle composites

Zhao, Wenji; Wang, Xizheng; Wang, Haiyang; Wu, Tao; Kline, Dylan J.; Rehwoldt, Miles C.; Ren, Hui; Zachariah, Michael R.

doi:10.1016/j.combustflame.2019.04.049

Cited by 44 publications

(19 citation statements)

References 37 publications

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“…Ignition temperature is one of the critical indicators of reactivity and reaction rates of energetic composites. , We coupled T-jump-TOFMS with high-speed imaging and ignition measurements to probe the in situ Mg release from Mg NP-composites and understand its implications on the reaction onsets and reactivity trends observed earlier for nMg with different oxidizers.…”

Section: Results and Discussionmentioning

confidence: 99%

“…composites. 50,65 We coupled T-jump-TOFMS with high-speed imaging and ignition measurements to probe the in situ Mg release from Mg NP-composites and understand its implications on the reaction onsets and reactivity trends observed earlier for nMg with different oxidizers. Figures 6a and S11 show the ignition snapshots of nMg with different oxidizers, clearly demonstrating a highly violent and exothermic reaction of nMg with the three oxidizers (burn time ∼ 100's of μs), which is consistent with the high reactivity observed earlier in the combustion cell tests.…”

Section: Thermal Analysis and Slow-heating Oxidationmentioning

confidence: 94%

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Vaporization-Controlled Energy Release Mechanisms Underlying the Exceptional Reactivity of Magnesium Nanoparticles

Ghildiyal

Biswas

Herrera

et al. 2022

ACS Appl. Mater. Interfaces

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Magnesium nanoparticles (NPs) offer the potential of high-performance reactive materials from both thermodynamic and kinetic perspectives. However, the fundamental energy release mechanisms and kinetics have not been explored due to the lack of facile synthetic routes to high-purity Mg NPs. Here, a vapor-phase route to surface-pure, core−shell nanoscale Mg particles is presented, whereby controlled evaporation and growth are utilized to tune particle sizes (40−500 nm), and their size-dependent reactivity and energetic characteristics are evaluated. Extensive in situ characterizations shed light on the fundamental reaction mechanisms governing the energy release of Mg NP-based energetic composites across particle sizes and oxidizer chemistries. Direct observations from in situ transmission electron microscopy and high-speed temperature-jump/time-of-flight mass spectrometry coupled with ignition characterization reveal that the remarkably high reactivity of Mg NPs is a direct consequence of enhanced vaporization and Mg release from their high-energy surfaces that result in the accelerated energy release kinetics from their composites. Mg NP composites also demonstrate mitigated agglomeration and sintering during reaction due to rapid gasification, enabling complete energy extraction from their oxidation. This work expands the compositional possibilities of nanoscale solid fuels by highlighting the critical relationships between metal volatilization and oxidative energy release from Mg NPs, thus opening new opportunities for strategic design of functional Mg-based nanoenergetic materials for tunable energy release.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Thermal Analysis and Slow-heating Oxidationmentioning

confidence: 94%

Vaporization-Controlled Energy Release Mechanisms Underlying the Exceptional Reactivity of Magnesium Nanoparticles

Ghildiyal

Biswas

Herrera

et al. 2022

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

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“…However, its application has often been restrained due to the native dense oxide layer (Al 2 O 3 ) passivating on the surface, hindering the diffusion of oxygen throughout Al particles in the combustion process [ 5 , 6 , 7 ]. Meanwhile, the combustion process of Al particles usually accompanies ignition delay, incomplete combustion, and so on [ 8 , 9 , 10 ]. Moreover, the larger the size of Al particles is, the longer the path of heat conduction will be [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Tuning the Reactivity of Perfluoropolyether-Functionalized Aluminum Nanoparticles by the Reaction Interface Fuel-Oxidizer Ratio

Nie

et al. 2022

Nanomaterials

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To deepen the oxidation depth and promote the exothermic reaction of aluminum nanoparticles (Al NPs), this work constructed perfluoropolyether-functionalized Al NPs by using a facile fabrication method. It was determined that perfluoropolyether (PFPE) was uniformly distributed on the surface of the Al NPs with no obvious agglomeration by micro-structure analysis. Thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), microcomputer automatic calorimeter (MAC), and combustion and ignition experiments were performed for varying percentages of PFPE blended with Al NPs to examine the reaction kinetics and combustion performance. It was revealed that the oxidation mechanism of PFPE-functionalized Al NPs at a slow heating rate was regulated by the reaction interface fuel–oxidizer ratio. Due to the enlarged fuel–oxidizer contact surface area, fluorine atoms could adequately decompose the inert alumina shell surrounding the Al NPs, optimizing the combustion process of Al NPs. The analytical X-ray diffraction (XRD) pattern results confirmed the existence of aluminum trifluoride in combustion products, providing insights into the oxidation mechanism of Al NPs. The obtained results indicated that PFPE participated in the oxidation of Al NPs and improved the overall reactivity of Al NPs.

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“…The diversity of iodine-containing fuels or oxidizers, which are the main components in a formula makes them favorable to adjust the output of the energy and biocidal, giving the study and development of the biocidal agent formula a perspective strategy (Figure ). Therefore, the formulation study of iodine-containing biocidal agents has gained increasing interest from researchers. − …”

Section: Other Iodine-rich Compoundsmentioning

confidence: 99%

New Promises from an Old Friend: Iodine-Rich Compounds as Prospective Energetic Biocidal Agents

Chang

Zhao

et al. 2020

Acc. Chem. Res.

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Metrics & MoreArticle Recommendations CONSPECTUS: For a very long time, frequent occurrences of biocrises have wreaked havoc on human beings, animals, and the environment. As a result, it is necessary to develop biocidal agents to destroy or neutralize active agents by releasing large amounts of strong biocides which are obtained upon detonation. Iodine is an efficient biocidal agent for bacteria, fungi, yeasts, viruses, spores, and protozoan parasites, and it is the sole element in the periodic table that can destroy microbes without contaminating the environment. Based on chemical biology, the mechanism of iodine as a bactericide may arise from oxidation and iodination reactions of cellular proteins and nucleic acids. However, because of the high vapor pressure causing elemental iodine to sublime readily at room temperature, it is inconvenient to use this material in its normal solid state directly as a biocidal agent under ambient conditions. Iodine-rich compounds where iodine is firmly bonded in molecules as a C−I or I−O moiety have been observed to be among the most promising energetic biocidal compounds. Gaseous products comprised of large amounts of iodine or iodine-containing components as strong biocides are released in the decomposition or explosion of iodine-rich compounds. Because of the detonation pressure, the iodine species are distributed over a large area greatly improving the efficacy of the system and requiring considerably less effort compared to traditional biocidal methods. The commercially available tetraiodomethane and tetraiodoethene, which possess superb iodine content also have the disadvantages of volatility, light sensitivity, and chemically reactivity, and therefore, are not suitable for use directly as biocidal agents. It is absolutely critical to synthesize new iodine-rich compounds with good thermal and chemical stabilities.In this Account, we describe our strategies for the syntheses of energetic iodine-rich compounds while maintaining the maximum iodine content with concomitant stability and routes for the synthesis of oxygen-containing iodine-rich compounds to improve the oxygen balance and achieve both high-energy and high-iodine content. In the other work, which involves cocrystals, iodinecontaining polymers were also summarized. It is hoped that this Account will provide guidelines for the design and syntheses of new iodine-rich compounds and a route for the development of inexpensive, more efficient, and safer iodine-rich antibiological warfare agents of the future.

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Titanium enhanced ignition and combustion of Al/I2O5 mesoparticle composites

Cited by 44 publications

References 37 publications

Vaporization-Controlled Energy Release Mechanisms Underlying the Exceptional Reactivity of Magnesium Nanoparticles

Vaporization-Controlled Energy Release Mechanisms Underlying the Exceptional Reactivity of Magnesium Nanoparticles

Tuning the Reactivity of Perfluoropolyether-Functionalized Aluminum Nanoparticles by the Reaction Interface Fuel-Oxidizer Ratio

New Promises from an Old Friend: Iodine-Rich Compounds as Prospective Energetic Biocidal Agents

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