Assembly and encapsulation of aluminum NP's within AP/NC matrix and their reactive properties

Wang, Xizheng; Jacob, Rohit J.; DeLisio, Jeffery B.; Zachariah, Michael R.

doi:10.1016/j.combustflame.2017.02.036

Cited by 99 publications

(36 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The spectrum was recorded by a 32 channel PMT (Hamamatsu) coupled with a high-speed data acquisition system (Vertilon IQSP 580). The time resolved spectra (500-800 nm band, 10 kHz) was then fit to Planck's law with a grey body approximation to get a time-resolved temperature profile [25]. Furthermore, channels that were sensitive to the absorption of light by I 2 gas were excluded from calculation.…”

Section: Combustion Cell and Flame Temperature Measurementsmentioning

confidence: 75%

Ignition and Combustion Characterization of Ca(IO₃)₂‐based Pyrotechnic Composites with B, Al, and Ti

Wang

Kline

Rehwoldt

et al. 2018

Propellants Explo Pyrotec

Self Cite

View full text Add to dashboard Cite

This paper studies the reactive behavior of calcium iodate with Al, B and Ti fuel particles as a thermal and iodine release source for neutralization of biological materials that might be employed in weapons. Two different calcium iodate particle length scales (micron and submicron) with different fuel/oxidizer ratios were used to prepare the iodized nanopyrolants. The optimal ratio was found to be the one with equivalence ratio of 2.0 for all the three fuels. The reactivity of the pyrolants can be enhanced by dehydrating the Ca(IO3)2 or replacing the micron oxidizer particles with submicron particles. The thermal decomposition process of the pyrolants was investigated at low and high heating rate. The results show that B, Al and Ti nanoparticles can promote the decomposition of Ca(IO3)2, but the Ti nanoparticles are the most efficient, which lower temperature of the oxygen/iodine release from ∼660 °C to ∼400 °C. Thus, Ti/Ca(IO3)2 has the lowest ignition temperature of ∼400 °C. The various calcium iodate‐based pyrolants were shown to have a wide range of reactivity (1–4 orders of magnitude) and burn times (1–3 orders of magnitude), high flame temperature (1850–2800 K) and iodine loading capacity (∼20–60 wt.‐% of iodine), which makes it a promising class of biocidal energetic materials.

show abstract

Section: Combustion Cell and Flame Temperature Measurementsmentioning

confidence: 75%

Ignition and Combustion Characterization of Ca(IO₃)₂‐based Pyrotechnic Composites with B, Al, and Ti

Wang

Kline

Rehwoldt

et al. 2018

Propellants Explo Pyrotec

Self Cite

View full text Add to dashboard Cite

show abstract

“…The pure AP decomposition could be divided into three stages with the temperature increasing: (1) firstly an endothermic peak at 247.4 °C was the phase transition from orthorhombic to cubic form; (2) then the exothermic peak at 293.4 °C was attributed to the partial decomposition of AP at low temperature decomposition stage (LDS); (3) and finally the endothermic peak at 416.5 °C was belonged to completely decomposition of AP at high temperature decomposition stage (HDS) . The final stage had an endothermic peak, suggesting the heat release depends on the competition between sublimation (endothermic process) and thermal decomposition (exothermic process) …”

Section: Resultsmentioning

confidence: 97%

“…The produced acid gases HCl, Cl 2 , ClO 2 et al could corrode the surface of aluminum powers, thus exposing more active aluminum to react with oxygen‐rich compounds, such O 2 and N 2 O. This could further oxidize fuels in a propellant system to promote the combustion of AP‐nAl‐CuO/MoS 2 composite . Therefore, these electrons and holes with longer life time in the case of 50%‐CuO/MoS 2 contributed to the enhanced accessibility of the charge carriers to reactants and the improved decomposition of AP, and further accelerated the AP‐nAl combustion.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Thermal Decomposition Properties and Catalytic Mechanism of Ammonium Perchlorate over CuO/MoS₂ Composite

Yang

Fan

et al. 2019

Applied Organom Chemis

View full text Add to dashboard Cite

In this report, CuO/MoS2 composites were successfully prepared by the hydrothermal method where nano‐sized CuO was uniformly distributed on the surface of hierarchical MoS2 substrates (CuO/MoS2 composites). Their physicochemical properties and catalytic performance in ammonium perchlorate (AP) decomposition were investigated and characterized by XRD, SEM, TEM, BET, XPS, TG/DSC and combustion measurement. The results showed that it could decrease AP decomposition temperature at high decomposition stage from 416.5 °C to 323.5 °C and increase the heat release from 378 J/g (pure AP) to 1340 J/g (AP with catalysts), which was better than pure CuO nanoparticles (345.5 °C and 1046 J/g). Meanwhile, it showed excellent performance in combustion reaction either in N2 or air atmosphere. The results obtained by photocurrent spectra, photoluminescence spectra and time‐resolved fluorescence emission spectra indicated that loading CuO mediated the generation rate and combination rate of electrons and holes, thus tuning the catalytic performance on AP decomposition. This study proved that employing the supports that can synergistically interact with CuO is an efficient strategy to enhance the catalytic performance of CuO.

show abstract

“…Nitrocellulose (NC), known as a derivative of cellulose, is a carbohydrate polymer produced by the nitration of cellulose [1]. As the nitrogen content exceeds 12.5 %, NC tends to be spontaneous combustion if exposed in the air, and it is usually served as the major component of single-and double-base propellants, explosives and gas generators [1][2][3][4][5][6][7]. Moderately nitrated cellulose with nitrogen content less than 12.5 % is also flammable and explosive, though less violent, and it is used as the ingredient in coatings, lacquers and inks [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…These data are necessary to quantify performance of energetic materials and their related compounds in their manufacture, handling, storage and usage [9,16]. Thus, in recent years, researches focusing on the thermal decomposition behaviors of pure NC have been comprehensively performed by virtue of DSC, DTA, TG and other calorimetric instruments [1][2][3][4][5][6][7][8][9]. However, the work concerning the combustion or fire properties of NC samples are still insufficient.…”

Section: Introductionmentioning

confidence: 99%

Effect of Bulk Density on the Combustion Property of Nitrocellulose with Isopropanol Humectant

Liu

Wang

et al. 2018

Propellants Explo Pyrotec

View full text Add to dashboard Cite

This paper experimentally examined the effect of bulk density on the combustion behaviour of nitrocellulose with isopropanol humectant. Experimental findings reveal that when the bulk density varies within 120.5∼171.5 kg m−3, the fuel regression rate in the quasi‐steady stage changes slightly, with an average value of 0.41 mm s−1, while it will decrease visibly as the bulk density increases within 171.5∼209.7 kg m−3. The overall regression rate follows the similar variation trend. The measurements of thermocouples mounted inside the sample also support the findings above, and further indicate the flame temperature of nitrocellulose‐isopropanol is about 600∼800 °C. Considering the measured radiative heat flux and flame height determined from flame intermittent contour, the radiation fraction of nitrocellulose‐isopropanol is quantitatively ascertained, i. e. roughly equivalent to 0.3. It is expected that the findings could provide insights into the fire risks of nitrocellulose products with different bulk densities and further offer guidance on their safety management.

show abstract

Assembly and encapsulation of aluminum NP's within AP/NC matrix and their reactive properties

Cited by 99 publications

References 47 publications

Ignition and Combustion Characterization of Ca(IO₃)₂‐based Pyrotechnic Composites with B, Al, and Ti

Ignition and Combustion Characterization of Ca(IO₃)₂‐based Pyrotechnic Composites with B, Al, and Ti

Enhanced Thermal Decomposition Properties and Catalytic Mechanism of Ammonium Perchlorate over CuO/MoS₂ Composite

Effect of Bulk Density on the Combustion Property of Nitrocellulose with Isopropanol Humectant

Contact Info

Product

Resources

About

Assembly and encapsulation of aluminum NP's within AP/NC matrix and their reactive properties

Cited by 99 publications

References 47 publications

Ignition and Combustion Characterization of Ca(IO3)2‐based Pyrotechnic Composites with B, Al, and Ti

Ignition and Combustion Characterization of Ca(IO3)2‐based Pyrotechnic Composites with B, Al, and Ti

Enhanced Thermal Decomposition Properties and Catalytic Mechanism of Ammonium Perchlorate over CuO/MoS2 Composite

Effect of Bulk Density on the Combustion Property of Nitrocellulose with Isopropanol Humectant

Contact Info

Product

Resources

About

Ignition and Combustion Characterization of Ca(IO₃)₂‐based Pyrotechnic Composites with B, Al, and Ti

Ignition and Combustion Characterization of Ca(IO₃)₂‐based Pyrotechnic Composites with B, Al, and Ti

Enhanced Thermal Decomposition Properties and Catalytic Mechanism of Ammonium Perchlorate over CuO/MoS₂ Composite