Excellent fatigue resistance is a prerequisite for flexible energy devices to achieve high and stable performance under repeated deformation state. Inspired by the sophisticated interfacial architecture of nacre, herein super fatigue‐resistant graphene‐based nanocomposite with integrated tensile strength toughness through poly(dopamine)‐nickel ion (Ni 2+ ) chelate that mimics byssal threads demonstrated. These kind synergistic interactions covalent ionic bonding effectively suppress crack...

Homogeneously mixing multiple metal elements within a single particle may offer new material property functionalities. High entropy alloys (HEAs), nominally defined as structures containing five or more well-mixed elements, are being explored at the nanoscale, but scale-up to enable their industrial application is an extremely challenging problem. Here, we report aerosol droplet-mediated technique toward scalable synthesis of HEA nanoparticles with atomic-level immiscible elements. An...

Graphene composite films inspired by nacre are the subject of ongoing research efforts to optimize their properties for applications in flexible energy devices. Noncovalent interactions do not cause interruption delocalized conjugated π-electron system, thus preserving graphene's excellent properties. Herein, we synthesized a molecule with pyrene groups on both ends long linear chain (AP-DSS) from 1-aminopyrene (AP) and disuccinimidyl suberate (DSS). The AP-DSS molecules used cross-link...

Interactions between energetic material relevant nanoscale metal oxides (SiO2, TiO2, MgO, Al2O3, CuO, Bi2O3) and poly(vinylidene fluoride) (PVDF) at high temperature were investigated by temperature-jump/time-of-flight mass spectrometry (T-jump/TOFMS) thermogravimetric-differential scanning calorimetry (TGA-DSC). Scanning electron microscopy (SEM) transmission (TEM) used to characterize the morphology of compositions, while X-ray diffraction (XRD) was utilized analyze condensed phase...

Although electromagnetic stimulation promises safe and controlled ignition of energetic materials, ultraviolet (UV) to infrared (IR) wavelength sources experience significant photon attenuations in materials. Conversely, radiation microwave frequencies is recognized for instantaneous volumetric heating capabilities. However, many energetics are poor heaters, accelerate the heating, recent efforts focused on adding susceptors that do not participate reaction. This first effort demonstrate...

Although aluminum (Al) nanoparticles have been widely explored as fuels in energetic applications, researchers are still exploring approaches for tuning their energy release profile via microstructural alteration. In this study, we show that a nanocomposite (∼70 nm) of metal ammine complex, such tetraamine copper nitrate (Cu(NH3)4(NO3)2/TACN), coated Al containing only 10 wt. % TACN, demonstrates ∼200 K lower reaction initiation temperature coupled with an order magnitude enhancement the...

Boron offers great promise as a candidate fuel in high-energy composites result of its high gravimetric and volumetric energy content; however, oxidation rate is limited by sluggish diffusion reactive species across low-melting oxide shell. On the other hand, Mg nanoparticles (NPs) have been shown recently to undergo fast following rapid vaporization (∼100 μs at heating rates ∼105 °C/s). This release vapor-phase can potentially be exploited react exothermically (ΔHr = −420 kJ/mol) with B2O3...

Biocidal nanothermite composites show great potential in combating biological warfare threats because of their high-energy-release rates and rapid biocidal agent release. Despite high reactivity combustion performance, these suffer from low-energy density the voids formed due to inefficient packing fuel oxidizer particles. In this study, we explore plasma-synthesized ultrafine Si nanoparticles (nSi, ∼5 nm) as an energetic filler increase energy Al/Ca(IO3)2 energetic-biocidal by filling...

Magnesium nanoparticles (NPs) offer the potential of high-performance reactive materials from both thermodynamic and kinetic perspectives. However, fundamental energy release mechanisms kinetics have not been explored due to lack facile synthetic routes high-purity Mg NPs. Here, a vapor-phase route surface-pure, core-shell nanoscale particles is presented, whereby controlled evaporation growth are utilized tune particle sizes (40-500 nm), their size-dependent reactivity energetic...

Ammonia borane (NH3BH3, AB) represents a promising energy-dense material for hydrogen storage and propulsion; however, its energy release mechanisms on oxidation by solid-state oxidizers are not well understood. In this study, through in situ time-of-flight mass spectrometry supported attenuated total reflection-Fourier transform infrared spectroscopy density functional theory calculations, we investigate the fundamental reaction involved from AB with different chemical oxidizers. We show...

The oxide layer is important for the processing and applications of silicon nanoparticles as it provides chemical stability to material. Herein, thermal oxidation sub-10-nm crystalline amorphous particles in dry air investigated with nonisothermal kinetic analysis including Kissinger Flynn-Wall-Ozawa methods at various heating rates. results indicate that have a considerably lower activation energy (98 kJ/mol) compared their counterparts (182 kJ/mol). In situ diffuse reflectance infrared...

Abstract Self‐healing binder is a prospective and efficient strategy to alleviate volume expansion of silicon (Si) anodes. However, excellent mechanical strength healing ability tend be mutually exclusive, due enhanced tensile stress limit by twining polymer chains, while inhibiting diffusion rate inducing failure blocked chains. Herein, inspired the planning course boat paddles, novel self‐healing (PVA‐4FBA‐PEI) designed synthesized with mobile parallel structure twining‐blocked...

Many characteristics of metal oxides are governed by defect chemistry. As a result, engineering has become an effective strategy to modulate the electrical, optical, and mechanical properties oxides. most commonly used oxidizers in nanothermite systems, offer opportunity manipulate reactions from fundamental, atomic-scale, structure aspect. However, challenge lies complexity that requires shifting equilibria without introducing other variations. In this work, we choose model oxidizer Co3O4...

Ammonium perchlorate (AP) is commonly used in propulsion technology. Recent studies have demonstrated that two-dimensional (2D) nanomaterials such as graphene (Gr) and hexagonal boron nitride (hBN) dispersed with nitrocellulose (NC) can conformally coat the surface of AP particles enhance reactivity AP. In this work, effectiveness ethyl cellulose (EC) an alternative to NC was studied. Using a similar encapsulation procedure recent Gr hBN EC were synthesize composite materials Gr-EC-AP...

Heat feedback to the unburned reaction interface is an important controlling factor of velocity front and power delivery. In this paper, we investigate effect agglomerate surface tension its relationship residence time heat on combustion characteristics by Si addition Al/KClO4 composite. Macroscopic imaging demonstrates a significant increase in burn rate with despite fact that Si/KClO4 has slightly lower energy density than Al/KClO4. Microscopic coupled three-color pyrometry reveals molten...

Natural nacre provides an inspiration for assembling graphene nanosheets into macroscopic high performance nanocomposites, as demonstrated by Qungfeng Cheng and co-workers in article number 1605636. Due to the synergistic interfacial interactions of covalent ionic bonding, a material with intrinsic tensile strength toughness, other functions, such excellent electrical conductivity, fatigue resistance, etc., is obtained.