Direct Writing of a 90 wt% Particle Loading Nanothermite

Wang, Haiyang; Shen, Jin; Kline, Dylan J.; Eckman, Noah; Agrawal, Niti R; Wu, Tao; Wang, Peng; Zachariah, Michael R.

doi:10.1002/adma.201806575

Cited by 68 publications

(39 citation statements)

References 43 publications

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“…In recent years, fluorine‐containing polymers, such as polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), and perfluoropolyether (PFPE), have been adopted in Al‐based energetic materials, and it has been shown that Al 2 O 3 shell can react exothermically with the fluoride gas decomposed from the polymers, thus transferring the “dead weight” to an energetic constituent . In this way, the oxidation efficiency is also improved when compared with pure ANPs with a dense surface oxide shell.…”

Section: Introductionmentioning

confidence: 99%

Superhydrophobic Fluorine‐Containing Protective Coating to Endow Al Nanoparticles with Long‐Term Storage Stability and Self‐Activation Reaction Capability

Guo²,

Gou³

et al. 2019

Adv Materials Inter

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The stability of aluminum (Al) nanoparticles (ANPs) is a key issue that can determine the energetic properties of Al‐based energetic materials. In this study, a surface functionalization approach is employed, using the chemical adsorption and auto polymerization effects of the 1H, 1H, 2H, 2H‐perfluorodecyltriethoxysilane (FAS‐17), to set up a highly stable barrier coating to water and further endow ANPs with long‐term storage stability and self‐activation reaction capability. The FAS‐17‐modified ANPs (AFNPs) with a superhydrophobic surface show their excellent stability in air and unique strengths in corrosion resistance to water by enhancing diffusion resistance of O2 and preventing the hydration reaction. In terms of energetic performances, compared to the two‐step slow oxidation of ANPs, the heat‐release rate of AFNPs is significantly enhanced, resulting in a drastic oxidation process profiting from the surface reaction between the FAS‐17 and alumina (Al2O3) layer. More importantly, the ignition and combustion properties of AFNPs are also greatly improved, which can undergo self‐propagation combustion with a fairly high energy output even after stored in water. At last, the possible mechanisms of oxidation resistance and self‐activation reaction capacities are also proposed.

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Section: Introductionmentioning

confidence: 99%

Superhydrophobic Fluorine‐Containing Protective Coating to Endow Al Nanoparticles with Long‐Term Storage Stability and Self‐Activation Reaction Capability

Guo²,

Gou³

et al. 2019

Adv Materials Inter

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show abstract

“…This constraint can be alleviated by developing unique ink formulations to impart shear thinning behavior. For example, Wang et al proposed a solution to this problem by formulating an ink containing polymer chains that form transient networks of hydrogen bonds and hydrophobic interactions 169. These bonds are disrupted by shear forces and quickly reconstitute after printing, imparting a shear‐thinning behavior that allowed direct ink writing of a 90 wt% nanothermite construct.…”

Section: Discussionmentioning

confidence: 99%

“…Viscoelastic ink with shear thinning behavior is often used to print through small nozzles with lower pressure. Unlike inkjet printing (2–10 2 mPa s94,123), DIW is compatible with a wide range of ink viscosity (2–10 6 mPa s125), capable of printing inks with a high volume fraction of nanoparticles 169. Additionally, multiple syringes can be used to print multiple materials,170–173 while inline mixers can produce material hybrids and material gradients, which allows for regional differences in functional properties 31,174…”

Section: D Printing Methodsmentioning

confidence: 99%

Nanomaterial Patterning in 3D Printing

et al. 2020

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The synergistic integration of nanomaterials with 3D printing technologies can enable the creation of architecture and devices with an unprecedented level of functional integration. In particular, a multiscale 3D printing approach can seamlessly interweave nanomaterials with diverse classes of materials to impart, program, or modulate a wide range of functional properties in an otherwise passive 3D printed object. However, achieving such multiscale integration is challenging as it requires the ability to pattern, organize, or assemble nanomaterials in a 3D printing process. This review highlights the latest advances in the integration of nanomaterials with 3D printing, achieved by leveraging mechanical, electrical, magnetic, optical, or thermal phenomena. Ultimately, it is envisioned that such approaches can enable the creation of multifunctional constructs and devices that cannot be fabricated with conventional manufacturing approaches.

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“…In recent years, researchers have conducted more promising studies and meaningful exploration on the 3D printing of reactive materials. An ink formulation was developed with only 10 wt.% of polymers, which can bind a 90 wt.% nanothermite using a simple direct‐writing approach . In fluoropolymer‐based reactive inks, micro‐aluminum (μm) and nano‐aluminum (nm) as the fuel at high solids loading (up to 67 wt.%) were shown .…”

Section: Thermal Behavior Of Nanothermites With Different Binder Contmentioning

confidence: 99%

3D Printing of Micro‐Architected Al/CuO‐Based Nanothermite for Enhanced Combustion Performance

et al. 2019

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The booming development of 3D printing offers unprecedented hope for the construction of functional materials. However, it is still challenging to fabricate nano energetic materials due to the high sensitivity of energetic materials and the difficulty of high loading of materials. Recently, ink‐based direct ink writing (DIW) 3D printing process for the preparation of reactive materials has attracted worldwide attention because of the simplicity in design of micro architecture and the possibility of low‐cost manufacturing. Herein, a novel strategy for printing Al/CuO nanothermite is successfully achieved by DIW 3D printing of nanothermite inks with good rheology shear‐thinning properties using F2311 as a binder. The loading of nanothermite in this ink formula is up to 90 wt.%, and the burning rate can be as high as 352 mm s−1. This approach provides new routes for achieving the applications in micro energetic device by printing high resolution and precise patterns of nanothermite with enhanced combustion performance.

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Direct Writing of a 90 wt% Particle Loading Nanothermite

Cited by 68 publications

References 43 publications

Superhydrophobic Fluorine‐Containing Protective Coating to Endow Al Nanoparticles with Long‐Term Storage Stability and Self‐Activation Reaction Capability

Superhydrophobic Fluorine‐Containing Protective Coating to Endow Al Nanoparticles with Long‐Term Storage Stability and Self‐Activation Reaction Capability

Nanomaterial Patterning in 3D Printing

3D Printing of Micro‐Architected Al/CuO‐Based Nanothermite for Enhanced Combustion Performance

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