Influence of Al/CuO reactive multilayer films additives on exploding foil initiator

Zhou, Xiang; Shen, Ruiqi; Ye, Yinghua; Zhu, Peng; Hu, Yan; Wu, Lizhi

doi:10.1063/1.3658617

Cited by 104 publications

(57 citation statements)

References 13 publications

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“…Nanostructured semiconductor films composed of thin layers of nanostructured objects such as nanoparticles, nanorods, nanowires or nanoporous networks with variable grain size and controlled porosity can exhibit properties superior to conventional thin films due to the deliberate engineering of nanoscale features into their structure and these films have practical applications in areas such as photovoltaics, electrochemical sensors, photoelectrochemical water splitting, biosensors and as antireflection layers. [1][2][3][4][5] Techniques such as thermal evaporation, 6 pulsed laser deposition, 7 DC and RF sputtering, 8,9 plasma evaporatihon, 10 sol-gel technique, 11 molecular beam epitaxy, 12 electrodeposition 13 and chemical vapor deposition 14 have been employed for the synthesis of nanostructured thin films of different semiconductors. Another technologically logical strategy for creating nanostructured films is the alignment of nanoparticle building blocks into ordered superstructures with non-resistive inter-particle contacts by bottom-up approaches and is one of the recent key topics in the area of nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

Grain size tuning of nanostructured Cu2O films through vapour phase supersaturation control and their characterization for practical applications

Anu

Khadar

2015

AIP Advances

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A strategy for creating nanostructured films is the alignment of nanoparticles into ordered superstructures as living organisms synthesize biomaterials with superior physical properties using nanoparticle building blocks. We synthesized nanostructured films of Cu2O of variable grain size by establishing the condition of supersaturation for creation of nanoparticles of copper which deposited as nanograined films and which was then oxidized. This technique has the advantage of being compatible with conventional vacuum processes for electronic device fabrication. The Cu2O film samples consisted of a secondary structure of spherical particles of almost uniform size, each particle being an agglomerate of primary nanocrystals. Fractal analysis of the AFM images of the samples is carried out for studying the aggregation mechanism. Grain size tuning of the nanostructured Cu2O films has been studied using XRD, and micro-Raman and photoluminescence spectroscopy.

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Section: Introductionmentioning

confidence: 99%

Grain size tuning of nanostructured Cu2O films through vapour phase supersaturation control and their characterization for practical applications

Anu

Khadar

2015

AIP Advances

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“…More recently,t hermite materials were also considered to produce gas species or pressure bursts, opening new potential fields of application such as pressure mediated molecular delivery [23,24],b iological agent inactivation [25][26][27],h ydrogen production [28,29],o rp ropulsion systems [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Modeling the Pressure Generation in Aluminum‐Based Thermites

Baijot

Glavier

Ducéré

et al. 2015

Propellants Explo Pyrotec

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[a] 1I ntroductionAlumino-thermite materials represent an interesting class of energetic substances notably because of their high energy densities, adiabatic flame temperature, and when nanosized, high reaction rates. Alumino-thermite is an oxidation-reduction reaction involving am etal (fuel) and am etallic oxide (or possibly an on-metallic oxide) that forms as table product after reaction.Thermite materials have been actively investigated for aw ide range of potential applications including railroad welding, materials processing to form refractory materials, additives in propellants, explosives and pyrotechnics [1][2][3], and more recently also for micro initiation [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20],e nvironmentally clean primers, and in situ welding [21].Among the numerous possible exothermic metal/oxide pairs listed in the literature [22],t he most investigated ones mix Al with MoO 3 ,C uO, Bi 2 O 3 ,F e 2 O 3 ,M nO 2 ,W O 3 ,a nd I 2 O 5 .F or the last two decades most of the research efforts aimed at reducing metal and oxide components size, improving their intimacy,t oi ncrease the reaction rate and decrease the ignition delay while improving safety.More recently,t hermite materials were also considered to produce gas species or pressure bursts, opening new potential fields of application such as pressure mediated molecular delivery [23,24],b iological agent inactivation [25][26][27],h ydrogen production [28,29],o rp ropulsion systems [7][8][9].Af ew teams demonstrated experimentally that Al/Bi 2 O 3 and, to al esser extent, Al/I 2 O 5 mixtures generate the highest pressure pulses [27,30,31] in comparison with other thermites. Martirosyan [31] considered that the reaction product (bismuth or iodine) boils at at emperature of 1560 8Ca nd 184 8C, respectively,w hich is lower than the maximum reaction temperature:t herefore causing bismuth or iodine evaporation with subsequent increase of the released gas pressure.For some thermites, such as Al/CuO, experiments using time-resolved mass spectrometry have measured significant O 2 release under rapid heating [32,33].T he formation of gaseous intermediates and their contribution to the pressurization may suggest why as ystem such as Al/MoO 3 , which is thermodynamically predicted to produce approximately only ap ercent of the gas that Al/CuO or Al/Bi 2 O 3 does, reacts rapidly and generates pressure as many other thermites.Despite these experimental research investigations, the effects of thermite composition, packing density together with its environmental conditions on the gas production (type and repartition of produced species and rate of gas release) need to be studied and understood in greater detail. On the theoretical side, af irst attempt to simulate Abstract:T he paper proposes an ew theoretical model based on local thermodynamic equilibrium enabling the prediction of gas generation during the reaction of aluminum-based thermites. We demonstrate that the model has the capability to predict the total pressure and the partial p...

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“…19a Ni melt, experimentally measured by means of quasielastic neutron 1396 scattering at 1928 K, was found to be equal to 4.9 Â 10 À9 m 2 /s 1397 [138]. Therefore, if we assume that the reaction is controlled by dif- ing foil initiator was studied in the work [146]. It was concluded 1507 that the reactive multilayer foil has the potential to decrease the 1508 initiation threshold, which will lead to a smaller volume of initia-1509 tor, further increasing safety and reliability.…”

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confidence: 95%

“…This 140 review places emphasis on material science aspects of nano-struc- 141 tured reactive systems. 142 Analysis of recent research papers on heterogeneous combus- 143 tion has clearly revealed that the new classes of reactive systems, 144 which are characterized by nanosized-scale and possess extremely 145 high reactivity, as compared to similar reactive systems with 146 micro-scale heterogeneity, has attracted the attention of 147 researchers and has dominated R&D. The present paper gives an 148 overview of four classes of such reactive nano-media: (i) mechani- 149 cally-structured composites; (ii) sol-gels; (iii) mixtures of metal 150 and metal-oxide nanopowders, i.e., so-called, super thermite 151 compositions and (iv) multilayer nano-foils. Research in each of 152 these areas is being performed almost independently and cross- 153 references are rare.…”

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confidence: 99%