The Experts below are selected from a list of 822 Experts worldwide ranked by ideXlab platform
Michael R. Zachariah - One of the best experts on this subject based on the ideXlab platform.
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Passivated Iodine Pentoxide Oxidizer for Potential Biocidal Nanoenergetic Applications
2016Co-Authors: Jingyu Feng, Guoqiang Jian, Qing Liu, Michael R. ZachariahAbstract:Iodine pentoxide (I2O5), also known as diiodine pentoxide, is a Strong Oxidizer which has been recently proposed as an iodine-rich Oxidizer in nanoenergetic formulations, whose combustion products lead to molecular iodine as a biocidal agent. However, its highly hygroscopic nature hinders its performance as a Strong Oxidizer and an iodine releasing agent and prevents its implementation. In this work, we developed a gas phase assisted aerosol spray pyrolysis which enables creation of iron oxide passivated I2O5. Transmission electron microscopy elemental imaging as well as temperature-jump mass spectrometry confirmed the core shell nature of the material and the fact that I2O5 could be encapsulated in pure unhydrated form. Combustion performance finds an optimal coating thickness that enables combustion performance similar to a high performing CuO based thermite
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Passivated Iodine Pentoxide Oxidizer for Potential Biocidal Nanoenergetic Applications
ACS applied materials & interfaces, 2013Co-Authors: Jingyu Feng, Guoqiang Jian, Qing Liu, Michael R. ZachariahAbstract:Iodine pentoxide (I2O5), also known as diiodine pentoxide, is a Strong Oxidizer which has been recently proposed as an iodine-rich Oxidizer in nanoenergetic formulations, whose combustion products lead to molecular iodine as a biocidal agent. However, its highly hygroscopic nature hinders its performance as a Strong Oxidizer and an iodine releasing agent and prevents its implementation. In this work, we developed a gas phase assisted aerosol spray pyrolysis which enables creation of iron oxide passivated I2O5. Transmission electron microscopy elemental imaging as well as temperature-jump mass spectrometry confirmed the core shell nature of the material and the fact that I2O5 could be encapsulated in pure unhydrated form. Combustion performance finds an optimal coating thickness that enables combustion performance similar to a high performing CuO based thermite.
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encapsulation of perchlorate salts within metal oxides for application as nanoenergetic Oxidizers
Advanced Functional Materials, 2012Co-Authors: Kyle Sullivan, Guoqiang Jian, Snehaunshu Chowdhury, Lei Zhou, Michael R. ZachariahAbstract:In this work, high-oxygen-content Strong Oxidizer perchlorate salts were successfully incorporated into current nanothermite composite formulations. The perchlorates were encapsulated within mild Oxidizer particles through a series of thermal decomposition, melting, phase segregation, and recrystallization processes, which occurred within confined aerosol droplets. This approach enables the use of hygroscopic materials by stabilizing them within a matrix. Several samples, including Fe2O3/KClO4, CuO/KClO4 and Fe2O3/NH4ClO4 composite Oxidizer particles, have been created. The results show that these composite systems significantly outperform the single metal oxide system in both pressurization rate and peak pressure. The ignition temperatures for these mixtures are significantly lower than those of the metal oxides alone, and time-resolved mass spectrometry shows that O2 release from the Oxidizer also occurs at a lower temperature and with high flux. The results are consistent with O2 release being the controlling factor in determining the ignition temperature. High-speed imaging clearly shows a much more violent reaction. The results suggest that a strategy of encapsulating a very Strong Oxidizer, which may not be environmentally compatible, within a more stable weak Oxidizer offers the opportunity to both tune reactivity and employ materials that previously could not be considered.
Guoqiang Jian - One of the best experts on this subject based on the ideXlab platform.
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Passivated Iodine Pentoxide Oxidizer for Potential Biocidal Nanoenergetic Applications
2016Co-Authors: Jingyu Feng, Guoqiang Jian, Qing Liu, Michael R. ZachariahAbstract:Iodine pentoxide (I2O5), also known as diiodine pentoxide, is a Strong Oxidizer which has been recently proposed as an iodine-rich Oxidizer in nanoenergetic formulations, whose combustion products lead to molecular iodine as a biocidal agent. However, its highly hygroscopic nature hinders its performance as a Strong Oxidizer and an iodine releasing agent and prevents its implementation. In this work, we developed a gas phase assisted aerosol spray pyrolysis which enables creation of iron oxide passivated I2O5. Transmission electron microscopy elemental imaging as well as temperature-jump mass spectrometry confirmed the core shell nature of the material and the fact that I2O5 could be encapsulated in pure unhydrated form. Combustion performance finds an optimal coating thickness that enables combustion performance similar to a high performing CuO based thermite
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Passivated Iodine Pentoxide Oxidizer for Potential Biocidal Nanoenergetic Applications
ACS applied materials & interfaces, 2013Co-Authors: Jingyu Feng, Guoqiang Jian, Qing Liu, Michael R. ZachariahAbstract:Iodine pentoxide (I2O5), also known as diiodine pentoxide, is a Strong Oxidizer which has been recently proposed as an iodine-rich Oxidizer in nanoenergetic formulations, whose combustion products lead to molecular iodine as a biocidal agent. However, its highly hygroscopic nature hinders its performance as a Strong Oxidizer and an iodine releasing agent and prevents its implementation. In this work, we developed a gas phase assisted aerosol spray pyrolysis which enables creation of iron oxide passivated I2O5. Transmission electron microscopy elemental imaging as well as temperature-jump mass spectrometry confirmed the core shell nature of the material and the fact that I2O5 could be encapsulated in pure unhydrated form. Combustion performance finds an optimal coating thickness that enables combustion performance similar to a high performing CuO based thermite.
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encapsulation of perchlorate salts within metal oxides for application as nanoenergetic Oxidizers
Advanced Functional Materials, 2012Co-Authors: Kyle Sullivan, Guoqiang Jian, Snehaunshu Chowdhury, Lei Zhou, Michael R. ZachariahAbstract:In this work, high-oxygen-content Strong Oxidizer perchlorate salts were successfully incorporated into current nanothermite composite formulations. The perchlorates were encapsulated within mild Oxidizer particles through a series of thermal decomposition, melting, phase segregation, and recrystallization processes, which occurred within confined aerosol droplets. This approach enables the use of hygroscopic materials by stabilizing them within a matrix. Several samples, including Fe2O3/KClO4, CuO/KClO4 and Fe2O3/NH4ClO4 composite Oxidizer particles, have been created. The results show that these composite systems significantly outperform the single metal oxide system in both pressurization rate and peak pressure. The ignition temperatures for these mixtures are significantly lower than those of the metal oxides alone, and time-resolved mass spectrometry shows that O2 release from the Oxidizer also occurs at a lower temperature and with high flux. The results are consistent with O2 release being the controlling factor in determining the ignition temperature. High-speed imaging clearly shows a much more violent reaction. The results suggest that a strategy of encapsulating a very Strong Oxidizer, which may not be environmentally compatible, within a more stable weak Oxidizer offers the opportunity to both tune reactivity and employ materials that previously could not be considered.
M. R. Zachariah - One of the best experts on this subject based on the ideXlab platform.
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metal iodate based energetic composites and their combustion and biocidal performance
ACS Applied Materials & Interfaces, 2015Co-Authors: H. Wang, G. Jian, W. Zhou, J. B. Delisio, V. T. Lee, M. R. ZachariahAbstract:The biological agents that can be weaponized, such as Bacillus anthracis, pose a considerable potential public threat. Bacterial spores, in particular, are highly stress resistant and cannot be completely neutralized by common bactericides. This paper reports on synthesis of metal iodate-based aluminized electrospray-assembled nanocomposites which neutralize spores through a combined thermal and chemical mechanism. Here metal iodates (Bi(IO3)3, Cu(IO3)2, and Fe(IO3)3) act as a Strong Oxidizer to nanoaluminum to yield a very exothermic and violent reaction, and simultaneously generate iodine as a long-lived bactericide. These microparticle-assembled nanocomposites when characterized in terms of reaction times and temporal pressure release show significantly improved reactivity. Furthermore, sporicidal performance superior to conventional metal-oxide-based thermites clearly shows the advantages of combining both a thermal and biocidal mechanism in spore neutralization.
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Metal Iodate-Based Energetic Composites and Their Combustion and Biocidal Performance
2015Co-Authors: H. Wang, G. Jian, W. Zhou, J. B. Delisio, V. T. Lee, M. R. ZachariahAbstract:The biological agents that can be weaponized, such as Bacillus anthracis, pose a considerable potential public threat. Bacterial spores, in particular, are highly stress resistant and cannot be completely neutralized by common bactericides. This paper reports on synthesis of metal iodate-based aluminized electrospray-assembled nanocomposites which neutralize spores through a combined thermal and chemical mechanism. Here metal iodates (Bi(IO3)3, Cu(IO3)2, and Fe(IO3)3) act as a Strong Oxidizer to nanoaluminum to yield a very exothermic and violent reaction, and simultaneously generate iodine as a long-lived bactericide. These microparticle-assembled nanocomposites when characterized in terms of reaction times and temporal pressure release show significantly improved reactivity. Furthermore, sporicidal performance superior to conventional metal-oxide-based thermites clearly shows the advantages of combining both a thermal and biocidal mechanism in spore neutralization
Jingyu Feng - One of the best experts on this subject based on the ideXlab platform.
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Passivated Iodine Pentoxide Oxidizer for Potential Biocidal Nanoenergetic Applications
2016Co-Authors: Jingyu Feng, Guoqiang Jian, Qing Liu, Michael R. ZachariahAbstract:Iodine pentoxide (I2O5), also known as diiodine pentoxide, is a Strong Oxidizer which has been recently proposed as an iodine-rich Oxidizer in nanoenergetic formulations, whose combustion products lead to molecular iodine as a biocidal agent. However, its highly hygroscopic nature hinders its performance as a Strong Oxidizer and an iodine releasing agent and prevents its implementation. In this work, we developed a gas phase assisted aerosol spray pyrolysis which enables creation of iron oxide passivated I2O5. Transmission electron microscopy elemental imaging as well as temperature-jump mass spectrometry confirmed the core shell nature of the material and the fact that I2O5 could be encapsulated in pure unhydrated form. Combustion performance finds an optimal coating thickness that enables combustion performance similar to a high performing CuO based thermite
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Passivated Iodine Pentoxide Oxidizer for Potential Biocidal Nanoenergetic Applications
ACS applied materials & interfaces, 2013Co-Authors: Jingyu Feng, Guoqiang Jian, Qing Liu, Michael R. ZachariahAbstract:Iodine pentoxide (I2O5), also known as diiodine pentoxide, is a Strong Oxidizer which has been recently proposed as an iodine-rich Oxidizer in nanoenergetic formulations, whose combustion products lead to molecular iodine as a biocidal agent. However, its highly hygroscopic nature hinders its performance as a Strong Oxidizer and an iodine releasing agent and prevents its implementation. In this work, we developed a gas phase assisted aerosol spray pyrolysis which enables creation of iron oxide passivated I2O5. Transmission electron microscopy elemental imaging as well as temperature-jump mass spectrometry confirmed the core shell nature of the material and the fact that I2O5 could be encapsulated in pure unhydrated form. Combustion performance finds an optimal coating thickness that enables combustion performance similar to a high performing CuO based thermite.
Conrad R Stoldt - One of the best experts on this subject based on the ideXlab platform.
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galvanic porous silicon composites for high velocity nanoenergetics
Nano Letters, 2011Co-Authors: Collin R Becker, Luke J Currano, Steven Apperson, Christopher J Morris, Shubhra Gangopadhyay, Wayne A Churaman, Conrad R StoldtAbstract:Porous silicon (PS) films ∼65−95 μm thick composed of pores with diameters less than 3 nm were fabricated using a galvanic etching approach that does not require an external power supply. A highly reactive, nanoenergetic composite was then created by impregnating the nanoscale pores with the Strong Oxidizer, sodium perchlorate (NaClO4). The combustion propagation velocity of the energetic composite was measured using microfabricated diagnostic devices in conjunction with high-speed optical imaging up to 930000 frames per second. Combustion velocities averaging 3050 m/s were observed for PS films with specific surface areas of ∼840 m2/g and porosities of 65−67%.
