Energetic Materials Frontiers
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2026
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IF 4.7
Kai Miao,Zi-chen Wang,Lu Wang,Yang Ran,Heng Xue,Shuang Gao,Sheng Huang,Di-chen Li
UV-curing-assisted direct ink writing (DIW) is an established additive manufacturing technique for composite solid propellants, facilitating the development aerospace propulsion systems. However, direct application to aluminum (Al)-containing propellant slurries leads to limited curing depth, attributed to the high UV absorbance of aluminum powder. To address this limitation, we propose a novel surface modification strategy in which aluminum powders are coated with polytetrafluoroethylene (PTFE), yielding PTFE@Al composite powders with a core-shell structure. UV absorbance measurements show that PTFE coatings reduce the absorbance of aluminum powder by approximately 63%. Scanning electron microscopy (SEM) confirmed the uniformity and integrity of the PTFE coatings. Thermogravimetric (TG) and differential scanning calorimetry (DSC) analyses indicate that PTFE coating significantly enhances the energy release of aluminum powder, achieving an exothermic heat output of 2.19 kJ·g -1 below 1400 °C-approximately three times that of uncoated aluminum. Furthermore, curing tests on formulations containing PTFE@Al powders demonstrated an approximate 15% increase in curing depth. These results demonstrate that PTFE@Al composite powders not only overcome the limitations of aluminum’s UV absorption but also significantly enhance photocuring efficiency and energetic output. This work presents an innovative material design strategy and a practical route for additive manufacturing of high-performance solid propellant grains.
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Meng Liu,Xinyu Tan,Xinyi Li,Jialin Geng,Mengmeng Han,Ke Wei,Xiaobo Chen
Superhydrophobic coatings have aroused increasing interest in many fields. However, the low light transmittance , poor mechanical robustness, and unsatisfactory chemical stability greatly limit the practical application of superhydrophobic coatings. Herein, a robust transparent superhydrophobic coating was prepared through a facile two-step dipping treatment. The coated glass displays good transparency with transmittance about 87 % in the wavelength range of 500–900 nm, remarkable superhydrophobic performance with a water contact angle of 158.8° and a sliding angle less than 1.0°. After a series of durability tests, including grit impact, etching in acidic and alkaline environments, and long-term outdoor exposure, the obtained coating can still maintain good superhydrophobic and transparency, which confirms the obtained coating has good mechanical robustness and chemical stability. Moreover, the coating exhibits good anti-icing property with a longer icing time and can maintain superhydrophobicity after 80 icing/de-icing cycles. It can be believed that such transparent superhydrophobic coating can be applied in many fields, owing to its low-cost and environmentally friendly fabrication method and its good performances in mechanical robustness and chemical stability.
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IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
·
2024
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IF 5.6
Luheng Wang,Maoyuan Nan,Xisi Long
To realize the simultaneous measurement of gap and gas concentration between narrow curved surfaces, in this article, a flexible spiral sensing element based on $\alpha $ -Fe2O3-doped multiwalled carbon nanotubes (MWCNTs) (mass ratio is 100) coated with polytetrafluoroethylene (PTFE) is prepared by spraying and spin coating technology using polyimide (PI) film as the substrate. The spiral structure has eddy current effect under ac excitation, which is sensitive to the change in the gap between the sensing element and metal target. Meanwhile, the $\alpha $ -Fe2O3-doped MWCNTs can respond to gas. The experimental results indicate that the gas response values of impedance amplitude, impedance angle, and resistance are 0.509%, 0.216%, and 1.376% at ethanol vapor concentration of 5000 ppm when the curvature radius is 50 mm with a gap of 0.5 mm, respectively. The absolute/relative sensitivities of impedance amplitude and impedance angle to the gap are 175 $711.54~\pm ~1424.85~\Omega \cdot \text { mm}^{-1}$ /11.347% $\pm ~0.095{\%}\cdot \text { mm}^{-1}$ and $2.614^{\circ }~\pm ~0.015^{\circ }\cdot \text { mm}^{-1}$ /5.307% $\pm ~0.033{\%}\cdot \text { mm}^{-1}$ in the gap range of 0–0.5 mm, respectively. In addition, according to impedance complex plane diagram of the sensing element, a signal processing method based on R–X is proposed, and the ability of flexible spiral sensing element to simultaneously measure the gap and gas concentration between narrow curved surfaces is preliminarily verified.
研究领域:
传感器技术
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材料科学
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气体检测
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高影响因子
ADVANCED MATERIALS
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2025
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IF 26.8
Kai-Yao Wang,Jing-Jing Li,Feng-Qi Shi,Yi-Ming Zhao,Ze-Yu Wang,Xin-Rong Zhang,Lin Cheng,Cheng Wang
Dimensionally adjustable channels are incorporated into a crystalline lattice via strategic stacking of wrinkled layers, boosting rare earth element (REE) ion exchange performance due to the eliminated energy-intensive dehydration and channel rigidity. In [(CH 3 ) 2 NH 2 ] 2 Ga 2 Sb 2 S 7 ( GaSbS-1 ), the lone electron pair (LEP) on Sb 3+ in the trigonal pyramidal {SbS 3 } influences Ga─S bond orientations, creating wrinkled [Ga 2 Sb 2 S 7 ] n 2 n − layers. Staggered stacking forms parallel channels occupied by [(CH 3 ) 2 NH 2 ] + cations, facilitating outstanding exchange for REE 3+ ions (Y 3+ , La 3+ −Lu 3+ ). Dynamic interlamellar expansion endows GaSbS-1 with remarkable kinetics ( R = 97.14%–99.40% within 5 min; k 2 = 2.592–3.462 g mg −1 min −1 ) and capacities (63, 125, 143, and 138 mg g −1 ) for Y 3+ , Ce 3+ , Eu 3+ , and Tm 3+ . It exhibits structural stability across pH = 2–12, with K d values > 10 4 –10 5 mL g −1 at pH = 4–9, and superior selectivity for REE 3+ over competing ions. Performance remains robust in real aqueous environments, including sea water, with maximum REE 3+ removal rates >90%. Rapid kinetics enable efficient column filtration ( R = 93.10%–98.51%) and recycling capability. The GaSbS-1 /PTFE membrane achieves 99.71%–99.95% removal of trace REE 3+ at 1.38 mL min ‒1 cm ‒2 (0.17 s contact time). With high yield, irradiation resistance, and facile elution, GaSbS-1 is a proof-of-concept exchanger for purifying REE-contaminated radioactive wastewater.
研究领域:
材料科学
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环境化学
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核废物处理
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无机化学
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分离技术
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稀土元素回收
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PubMed
高影响因子
危险品化学品经营许可证（带存储）