scholarly journals Polymer Grafted Aluminum Nanoparticles for Percolative Composite Films with Enhanced Compatibility

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 638
Author(s):  
Chenggong Yang ◽  
Chufarov Marian ◽  
Jie Liu ◽  
Qi Di ◽  
Mingze Xu ◽  
...  
Keyword(s):  
Energetic Materials ◽  
Colloidal Stability ◽  
Breakdown Strength ◽  
Composite Films ◽  
Electrical Explosion ◽  
Aluminum Nanoparticles ◽  
Al Nanoparticles ◽  
Electrical Explosion Of Wires ◽  
Highly Energetic Materials ◽  
Poor Stability

Aluminum nanoparticles hold promise for highly energetic materials and sustainable surface plasmonic materials. Most of the commercial Al nanoparticles are prepared via a high-throughput electrical explosion of wires method (up to 200 g h−1). However, the use of Al nanoparticles produced by an electrical explosion of wires is limited by their micrometer-sized aggregations and poor stability. Here, we use polystyrene with –COOH end-group to graft onto isolated Al nanoparticles and dramatically enhance their colloidal stability in various organic solvents. We further demonstrate that the polystyrene grafted Al nanoparticles can be doped into polystyrene films with high compatibility, leading to enhanced dielectric properties, such as higher dielectric constant, lower dielectric loss, and stronger breakdown strength. Moreover, the composite film can improve the moisture resistance of embedded Al nanoparticles.

Ultrahigh Energy Storage Performances of Polymer-based Nanocomposite via Interfaces Engneering

2020 ◽  
Author(s):  
Peng Wang ◽  
Zhongbin Pan ◽  
Weilin Wang ◽  
Jianxu Hu ◽  
Jinjun Liu ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Energy Storage ◽  
High Performance ◽  
Breakdown Strength ◽  
Composite Films ◽  
Power Electronic ◽  
Ultrahigh Energy

High-performance electrostatic capacitors are in urgent demand owing to the rapidly development of advanced power electronic applications. However, polymer-based composite films with both high breakdown strength (Eb) and dielectric constant...

Surface Passivation of Bare Aluminum Nanoparticles using Perfluoroalkyl Carboxylic Acids

2003 ◽  
Vol 800 ◽  
Author(s):  
R. Jason Jouet ◽  
Andrea D. Warren ◽  
David M. Rosenberg ◽  
Victor J. Bellitto
Keyword(s):  
Composite Material ◽  
Surface Passivation ◽  
Catalytic Decomposition ◽  
Self Assembled Monolayers ◽  
Aluminum Nanoparticles ◽  
Wet Chemistry ◽  
Al Nanoparticles ◽  
Polar Organic Solvents ◽  
Assembled Monolayers

AbstractSurface passivation of unpassivated Al nanoparticles has been realized using self assembled monolayers (SAMs). Nanoscale Al particles were prepared in solution by catalytic decomposition of H3Al•NMe3 or H3Al•N(Me)Pyr by Ti(OiPr)4 and coated in situ using a perfluoroalkyl carboxylic acid SAM. Because the Al particles are prepared using wet chemistry techniques and coated in solution, they are free of oxygen passivation. This SAM coating passivates the aluminum and seems to prevent the oxidation of the particles in air and renders the composite material, to some extent, soluble in polar organic solvents such as diethyl ether. Characterization data including SEM, TEM, TGA, and ATR-FTIR of prepared materials is presented.

scholarly journals Active Mode Remote Infrared Spectroscopy Detection of TNT and PETN on Aluminum Substrates

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
John R. Castro-Suarez ◽  
Leonardo C. Pacheco-Londoño ◽  
Joaquín Aparicio-Bolaño ◽  
Samuel P. Hernández-Rivera
Keyword(s):  
Infrared Spectroscopy ◽  
Energetic Materials ◽  
Angle Of Incidence ◽  
Least Squares Regression ◽  
Active Mode ◽  
Infrared Telescope ◽  
Infrared Spectrometer ◽  
Highly Energetic Materials ◽  
Aluminum Plates ◽  
Aluminum Substrates

Two standoff detection systems were assembled using an infrared telescope coupled to a Fourier transform infrared spectrometer, a cryocooled mercury-cadmium telluride detector, and a telescope-coupled midinfrared excitation source. Samples of the highly energetic materials (HEMs) 2,4,6-trinitrotoluene (TNT) and pentaerythritol tetranitrate (PETN) were deposited on aluminum plates and detected at several source-target distances by carrying out remote infrared spectroscopy (RIRS) measurements on the aluminum substrates in active mode. The samples tested were placed at 1–30 m for the RIRS detection experiments. The effect of the angle of incidence/collection of the IR beams on the vibrational band intensities and the signal-to-noise ratios (S/N) were investigated. Experiments were performed at ambient temperature. Surface concentrations from 50 to 400 μg/cm2 were studied. Partial least squares regression analysis was applied to the spectra obtained. Overall, RIRS detection in active mode was useful for quantifying the HEMs deposited on the aluminum plates with a high confidence level up to the target-collector distances of 1–25 m.

Synthesis of Al nanoparticles and Al/AlN composite nanoparticles by electrical explosion of aluminum wires in argon and nitrogen

2016 ◽  
Vol 295 ◽  
pp. 307-314 ◽  
Author(s):  
Marat I. Lerner ◽  
Elena A. Glazkova ◽  
Aleksandr S. Lozhkomoev ◽  
Natalia V. Svarovskaya ◽  
Olga V. Bakina ◽  
...  
Keyword(s):  
Electrical Explosion ◽  
Composite Nanoparticles ◽  
Al Nanoparticles

Understanding and Tuning the Reactivity of Nano-Energetic Materials

2005 ◽  
Vol 896 ◽  
Author(s):  
A. Rai ◽  
L. Zhou ◽  
A. Prakash ◽  
A. McCormick ◽  
M. R. Zachariah
Keyword(s):  
Metal Oxide ◽  
Single Particle ◽  
Energetic Materials ◽  
Metal Oxide Nanoparticles ◽  
Oxide System ◽  
Oxide Nanoparticles ◽  
Aluminum Nanoparticles ◽  
Particle Sizes ◽  
Outward Diffusion ◽  
Oxidative Reactivity

AbstractMixtures of fuel and oxidizers with particle sizes in the nanometer range have been widely used for energy intensive applications like propellants and explosives. Nano- Al is invariably used as fuel, while a host of metal oxide nanoparticles are used as oxidizers. This article aims at understanding and tuning the reactivity of these nano-energetic materials. The first part of this article discusses the oxidative reactivity of aluminum nanoparticles as measured experimentally using single-particle mass-spectrometer (SPMS) and microscopy and then modeled. Experimental evidence suggests that outward diffusion of aluminum is an important phenomenon in the oxidation of aluminum nanoparticle. Also melting of the aluminum core is necessary for the reaction to take place vigorously. In the second part of the paper we discuss the formation of novel oxidizers. A super-reactive formulation of Al/KMnO4 has been developed which is shown to be orders of magnitude more reactive than the traditional formulations of Al/Fe2O3, Al/MoO3 and Al/CuO. We demonstrate the formation of novel composite oxidizers to tune the reactivity of the Al/Metal oxide system.

Properties of Copper and Molybdenum Sulfide Powders Produced by Self-Propagating High-Temperature Synthesis

2013 ◽  
Vol 872 ◽  
pp. 191-196 ◽  
Author(s):  
Farabi Bozheyev ◽  
Vladimir V. An ◽  
Yuriy Irtegov
Keyword(s):  
High Temperature ◽  
Molybdenum Disulfide ◽  
Copper Sulfide ◽  
Average Particle Size ◽  
Electrical Explosion ◽  
Molybdenum Sulfide ◽  
Average Particle ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
Electrical Explosion Of Wires

Copper and molybdenum sulfide nanopowders were prepared by self-propagating high-temperature synthesis in argon. The initial copper powder and molybdenum powder were produced by electric spark dispersion in hexane and by electrical explosion of wires (EEW) in argon, respectively. The powders were studied by electron microscopy, X-ray diffraction and Raman spectroscopy. The copper sulfide main phase is hexagonal 2H-CuS, whereas hexagonal 2H-MoS2 and rhombohedral 3R-MoS2 are characteristic for molybdenum disulfide. The lattice parameters of copper and molybdenum sulfides were calculated. The average particle size of copper sulfide and molybdenum disulfide powders was about 50 nm and 80 nm, respectively.

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