Microcrystalline PETN Prepared Using Microfluidic Recrystallization Platform and Its Performance Characterization

Yang, Zhi; Zhu, Peng; Zhang, Qiu; Shi, Jinyu; Wang, Ke; Shen, Ruiqi

doi:10.1002/prep.202000298

Cited by 10 publications

(3 citation statements)

References 25 publications

(21 reference statements)

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“…In recent years, microfluidic technology has developed rapidly and has been widely used in the preparation of micro and nano scale particles due to its advantages of good mixing performance, rapid preparation and screening, low sample consumption, automation, and high throughput [7, 8]. Liu Kang [9] et al.…”

Section: Introductionmentioning

confidence: 99%

A novel micromixer for efficient mixing and nano‐TATB preparation

Guo,

Zhou,

Liu

et al. 2023

Propellants Explo Pyrotec

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Passive micromixers are widely used in the preparation of ultrafine explosives because of their efficient mixing and necessary safety. A novel passive micromixer was designed to prepare nano‐TATB. Computational fluid dynamics (CFD) is used to simulate the opening width (K), fluid velocity and mixing performance of the micromixer. The results show that the proposed micromixer has good mixing performance in the Reynolds number (Re) range of 0.1~100, and its pressure drop less than 28204 Pa at Re=100. A microfluidic recrystallization system was established and nano‐TATB was prepared by a new micromixer. The results show that the average particle size of the prepared TATB is 93.12 nm, and the particle size distribution ranges from 43 nm to 151.4 nm. The SEM test shows that TATB has better morphological characteristics. XRD results show that the crystal structure of TATB is consistent with that of raw materials. This study proves that the new micromixer has good mixing effect and the feasibility of preparing nano TATB. It also provides reference for the design of micromixer and refinement of other energetic materials.

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Section: Introductionmentioning

confidence: 99%

A novel micromixer for efficient mixing and nano‐TATB preparation

Guo,

Zhou,

Liu

et al. 2023

Propellants Explo Pyrotec

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“…Micro-nano satellites demands a new generation of miniaturized propulsion system with more accurate thrust and more precisely positioning [1,2]. As a type of electromagnetic plasma propulsion device, Hall thruster has achieved mature application in medium-power and high-power field due to its high performance and high reliability [3,4].…”

Section: Introductionmentioning

confidence: 99%

The effect of anode axial position on the performance of a miniaturized cylindrical Hall thruster with a cusp-type magnetic field

Gao¹,

Wang²,

Li³

et al. 2022

Plasma Sci. Technol.

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A 200 W cylindrical Hall thruster with a cusp-type magnetic field was proposed, manifesting convergent plume and high specific impulse. In this paper, a series of ring-shaped anodes are designed and the influence of anode axial position on the performance of CHT with a cusp-type magnetic field is studied. The experimental results indicate that the thruster keeps stable operation at the condition of 140-270 W discharge power. When the anode moves axially towards the upstream cusp field, the thrust enhances from 6.5 mN to 7.6 mN and the specific impulse enhances from 1658 s to 1939 s significantly. These improvements in thruster performance should be attributed to the enhancement of current utilization, propellant utilization, and acceleration efficiency. According to the analyses on the discharge characteristics, it is revealed that as the anode moves upstream, the electron transport path could be extended, the magnetic field in this extended path could impede electron cross-field transport and facilitate the ionization intensity, yielding to the enhancement of current utilization and propellant utilization efficiency. Moreover, along with this enhancement of upstream ionization at the given anode flow rate, the main ionization region is thought to move upstream and then separate clearer from the acceleration region, which has been demonstrated by the narrowing of IEDF shape. This change in the acceleration region could decrease the ion energy loss and enhance acceleration efficiency. This work is beneficial for optimizing the electrode structure of the thruster and recognizing the ionization and acceleration process under the cusp magnetic field.

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“…How can we assemble AP, nAl and fluoropolymer together? Common preparation methods in the literature, such as sol-gel [25][26][27][28][29][30][31], microfluidic [32][33][34][35][36][37][38][39], solvent-antisolvent coating [40][41][42][43], and spray drying [44][45][46][47][48], had their own shortcomings. For example, sol-gel was easy to introduce impurities, and later drying needs freeze drying or supercritical drying.…”

mentioning

confidence: 99%

Construction of hollow heterogeneous microspheres containing energy storage fibers by electric spray to promote combustion of nano aluminum

Zhang

Chen

et al. 2023

Preprint

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To solve the problem of nano-aluminum (nAl) powder easy agglomeration and improve its thermal reaction, nAl was hybrid with adhesive (Viton A, F2602) and oxidizer (Ammonium perchlorate, AP) forming microspheres by electrostatic spray method. The morphology and structure were analyzed by SEM, EDS and XPS. The results showed that the microspheres (diameter ≈ Φ10 ~ 15 µm) were hollow structures formed by winding of fluoropolymer fibers, while AP and nano aluminum particles were embedded on the fibers. By controlling the electric spray process, the well-dispersed AP and nAl nanocrystals were assembled on the fiber. Thermal analysis indicated that the gas phase products decomposed by AP were absorbed by porous microspheres, and part of the heat was stored in polymer fibers, thus promoting the breakdown of the alumina shell and accelerating the pre-ignition reaction. The combustion and laser ignition experiments proved hollow heterogeneous microspheres have excellent thermodynamic properties. The assembled microspheres not only solved the problem of poor rheology caused by the agglomeration of nAl, but also improved the insufficient combustion of nAl and the condensation of products.

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Microcrystalline PETN Prepared Using Microfluidic Recrystallization Platform and Its Performance Characterization

Cited by 10 publications

References 25 publications

A novel micromixer for efficient mixing and nano‐TATB preparation

A novel micromixer for efficient mixing and nano‐TATB preparation

The effect of anode axial position on the performance of a miniaturized cylindrical Hall thruster with a cusp-type magnetic field

Construction of hollow heterogeneous microspheres containing energy storage fibers by electric spray to promote combustion of nano aluminum

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