MATERIALS SCIENCE FORUM
·
2014
·
IF 0
Lu Liu,Hui Ren,Qing Jie Jiao
Due to high reaction activity and high combustion heat release, magnesium is widely used in the field of explosives. The research focus of this article is the effect of magnesium powder size and content on the thermal decomposition of PTFE. Two different particle sizes of magnesium powder are regarded as research objects. The thermal behavior of Mg/PTFE energetic system was investigated by TG-DSC analyzer. The experimental results show that magnesium has a catalytic effect on the thermal decomposition of PTFE. With the increase of magnesium content , the decomposition peak temperature of PTFE decreased firstly and when passed the ratio 50% increased, the best mixing ratio is Mg: PTFE =50:50. Within nanopowder, the activation energy of PTFE decreased by 150kJ∙mol-1 compared to 112 kJ∙mol-1 by mixing with micro powder. Obviously nanopowder has a better reactivity than micro powder, so has a more obvious catalytic effect.
研究领域:
材料科学
·
热力学
✓ 已验证
DOI
ACS Omega
·
2025
·
IF 4.3
Xiao-Feng Xu,Zhao-Jian Li,Zhen Zhang,Shuai-Yu Wu,Kai-Zhen Yuan,Lu-Yao Wang,Yun-Ze Long,Hong-Di Zhang
Triboelectric catalysis is a new technology that converts mechanical energy to chemical energy. This study presents a novel efficient triboelectric catalytic design based on iron (Fe0) and polytetrafluoroethylene (PTFE). The tribocatalytic effect was evaluated by degrading methyl orange (MO), crystal violet (CV), and tetracycline (TC). The degradation efficiency can reach 95, 97, and 93% within 24 min, respectively, and the kinetic constant K of CV was as high as 0.1460 min–1. The comparison with the stirring experiment showed that the friction catalytic effect between Fe0 and PTFE was significantly enhanced under ultrasonic irradiation. Furthermore, the triboelectric effect is used to provide simplicity and strong triboelectric catalytic activity of Fe0/PTFE, and the influencing factors are analyzed. And the production of reactive oxygen species (ROS) of hydroxyl radicals and superoxide radicals increases during the catalytic process. The mechanism of triboelectric catalysis is discussed in terms of electron transfer and transition. This study utilizes the triboelectric effect of Fe0/PTFE to provide simplicity and superior triboelectric catalytic activity under ultrasonic irradiation.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano-Micro Letters
·
2026
·Vol. 18
·期 1
·257
·
IF 38.5
Zhou Yin,Yin Kun,Zhang Tian,Feng Dongyu,Li Jiapei,Zhu Anquan,Lin Dewu,Xue Pan,Liu Yu,Liu Yongyu,Liu Kai,Liu Kunlun,Luan Chuhao,Yang Huawei,Chen Hou,Yao Yagang,Hong Guo
PtFe catalyst was rationally designed based on frontier molecular orbital theory to investigate orbital-level interactions for enhanced oxygen evolution reaction activity in Li–O 2 batteries.
The d z 2 – d z 2 orbital coupling between Fe and Pt leads to electron donation from Fe to Pt, increasing electron population in the Pt d z 2 orbital.
Excess electrons from the Pt d z 2 orbital occupy antibonding states with LiO 2 , weakening interaction strength and boosting oxygen evolution reaction kinetics.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2022
·Vol. 47
·期 6
·e202200004
·
IF 2.134
Wei Cao,Jianlong Ran,Haoxu Wang,Wei Guo,Xiaojun Lu,Jun Wang
Investigation of the energy performance of HMX-based aluminized explosives added with polytetrafluoroethylene (PTFE) oxidizer was undertaken and compared with the PTFE-free aluminized explosive of similar formulation. Firstly, the heat of explosion was measured in a calorimetric bomb, next the underwater explosion was conducted, then the cylinder expansion test was performed, and finally, the detonation reaction zone parameters were determined by the interface particle velocity experiment. Compared with the PTFE-free aluminized explosive, the addition of PTFE into aluminized explosives increases the heat of explosion significantly from the calorimetric data. The PTFE-containing aluminized explosive also yields the longer first bubble oscillation time in the underwater explosion than the PTFE-free and ammonium perchlorate-containing counterparts. From the cylinder test data, the wall velocity and Gurney energy were determined. The aluminized HMX containing PTFE shows an inferior acceleration ability to PTFE-free aluminized HMX, but exhibits a stronger afterburning potential. The addition of PTFE to aluminized HMX decreases detonation velocity and CJ pressure and increases the detonation reaction zone time and length. It has reasons to believe that the PTFE partially decomposes in detonation reaction zone. Conclusions on the potential use and suggestion for future research of PTFE as an oxidizer in aluminized explosives are drawn.
✓ 已验证
DOI
高影响因子
WEAR
·
2020
·
IF 4.108
Wei Sun,Xiaojun Liu,Kun Liu,Wei Wang,Jiaxin Ye
Nanosized α-phase alumina has been one of the few inorganic fillers that could induce 10 −7 mm 3 /Nm ultralow wear rates of PTFE for the past two decades. We report here two additional oxide fillers, beryllia (BeO) and germania (GeO 2 ) particles, that exhibit comparable wear reduction ability when filled in PTFE. Particle size and surface chemistry analysis revealed that the beryllia and germania particles had different structure and size from the alumina fillers used in this study whereas their composites shared similar ultralow wear rates and carboxylate salt rich tribofilms to the alumina PTFE system. Results in this study support both a particle structure driven and a tribochemistry driven wear reduction hypothesis for the alumina PTFE composite as previously suggested; whereas more systematic investigations are needed to elucidate wear resistance mechanisms in the beryllia and germania filled PTFE composites.
研究领域:
材料科学
·
表面工程
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Mengdi Xu,Jinxue Cheng,Xiongfei Du,Qiang Guo,Yan Huang,Qinglin Huang
Membrane distillation (MD) has been identified as a promising technology to desalinate the saline wastewater owing to its unique advantages including its ability in treating hypersaline solutions, 100% (theoretical) solute rejection and mild operating conditions. However, polytetrafluoroethylene (PTFE) hydrophobic membranes used for MD process were prone to be wetted caused by fouling due to the amphiphilic organics in feed solution. Herein, we developed an effective approach to fabricate amphiphobic PTFE nanofibrous membrane with enhanced anti-wetting and anti-fouling. During which, polyacrylonitrile (PAN) fiber was co-electrospun into PTFE/PVA precursor membrane, and Stőber method was adopted for in-situ growing of SiO 2 nanoparticles (SiNPs). After sintering, the SiNPs were fixed on the surface of PAN and PTFE fibers through chemical bonds and adhesive forces, respectively, which constructed membrane surface micro/nano structure. And then, the trimethoxy (1H,1H,2H,2H-heptadecafluorodecyl) silane (17-FAS) was used to fluorinate SiNPs. The prepared PTFE membrane exhibited strong amphiphobicity with water contact angle of 166.9° and oil contact angle of 134.5°. The amphiphobic PTFE membranes behaved a stable flux and excellent salt rejection during the 24h MD experiment in treating hypersaline solution, saline containing surfactant and oily saline. Also, the membranes showed excellent stability and reusability in the three cycles test, showing good application prospect in MD process, especially in the harsh environment.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2024
·
IF 14.3
Bohan Deng,Xian He,Peng Du,Wei Zhao,Yuanzheng Long,Zhuting Zhang,Hongyi Liu,Kai Huang,Hui Wu
Binder plays a crucial role in constructing high-performance electrodes for water electrolysis. While most research has been focused on advancing electrocatalysts, the application of binders in electrode design has yet to be fully explored. Herein, the in situ incorporation of polytetrafluoroethylene (PTFE) as a multifunctional binder, which increases electrochemical active sites, enhances mass transfer, and strengthens the mechanical and chemical robustness of oxygen evolution reaction (OER) electrodes, is reported. The NiFe-LDH@PTFE/NF electrode prepared by co-deposition of PTFE with NiFe-layered double hydroxide onto nickel foam demonstrates exceptional long-term stability with a minimal potential decay rate of 0.034 mV h −1 at 500 mA cm −2 for 1000 h. The alkaline water electrolyzer utilizing NiFe-LDH@PTFE/NF requires only 1.584 V at 500 mA cm −2 and sustains high energy efficiency over 1000 h under industrial operating conditions. This work opens a new path for stabilizing active sites to obtain durable electrodes for OER as well as other electrocatalytic systems.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2026
·Vol. 132
·期 4
·342
·
IF 3
Yang Qianpeng,Yuan Xin,Huang Yumin,Luo Qizhao,Wang Jing,Lan Weiyun,Jiang Haifeng
The growing pressure on global energy and freshwater resources necessitates continuous innovation in resource management technologies to ensure long-term sustainability. Solar energy, as a widely accessible and renewable resource, is of strategic importance for sustainable development. This has driven advancements in photothermal membrane distillation (PMD), which integrates interfacial solar conversion with phase-change separation. However, under prolonged exposure to hypersaline feed solutions, solute accumulation at the thermal interface of hydrophobic membranes often leads to crystalline deposition within micropores. This results in irreversible membrane fouling and a severe decline in permeate flux stability. Aimed at resolving this issue, a highly salt-resistant PTFE/PEGDA/graphene hydrogel composite membrane was developed. In this design, a PEGDA hydrogel forms a hydrophilic cross-linked polymer network that reduces membrane surface adhesion to salt crystals. The incorporation of graphene further inhibits crystal adhesion on the inner pore walls and mitigates excessive local concentration, thereby enhancing resistance to salt crystallization. The water production performance of this composite membrane was evaluated under varying light intensities. In low-concentration brine, water production increased by nearly 35%. The enhancement was even more pronounced at higher salinities, with a production increase of nearly 74%, the water production rate reached 2.08 kg·m −2 ·h −1 . The membrane distillation system maintained strong salt resistance over 3 h of operation, and the desalination rate of the produced water exceeded 99.9%. These results demonstrate that the PTFE/PEGDA/graphene hydrogel composite membrane significantly improves membrane surface resistance to salt crystallization, thereby greatly enhancing system stability and efficiency in high-salinity environments.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·Vol. 14
·期 1
·120678
·
IF 7.2
Tingting Deng,Wensheng Qi,Run Yuan,Dapeng Liu,Ganwei Zhang,Yaoliang Hong
Membrane distillation (MD) holds promise for treating high-salinity wastewater due to its salt tolerance and high rejection efficiency. However, membrane wetting and fouling severely impede its practical application. To address these challenges, this study proposes a strategy for fabricating a Janus PTFE membrane by introducing a PVDF interlayer, which enables stable unilateral hydrophilic modification of the superhydrophobic electrospun PTFE nanofibrous substrate. The key aspect of this design lies in the significantly enhanced adhesion between the low-surface-energy PTFE substrate and the hydrophilic TA-APTES-TEOS coating, achieved through the molecular compatibility of the PVDF interlayer. The designed Janus membrane represents a synergistic combination of the favorable porous structure of the PTFE substrate—which ensures high water vapor flux—and functional surface wettability, integrating the anti-wetting property of the superhydrophobic base with the anti-fouling capability of the underwater superoleophobic coating (UOCA 155°). This synergistic design conferred simultaneous anti-wetting and anti-fouling properties during MD operation. The resulting Janus membrane exhibited outstanding performance in treating hypersaline oily wastewater, maintaining a stable flux of 17.5 ± 0.5 kg·m⁻²·h⁻¹ and salt rejection exceeding 99.99 %. This work provides new insights for developing high performance PTFE membranes for MD applications.
研究领域:
膜科学与技术
·
水处理
·
材料科学
·
环境工程
·
分离过程
✓ 已验证
产品关联
DOI
高影响因子
Defence Technology
·
2021
·
IF 3.172
Yan-jun Yin,Feng Hu,Le-hua Cheng,Xiao-dong Wang
Thermite films are typical energetic materials (EMs) and have great value in initiating explosive devices. However, research in thermite film preparation is far behind that of research in thermite powders. Electrophoretic deposition (EPD) is an emerging, rapid coating method for film fabrication, including of energetic composite films. In this work, a polytetrafluoroethylene (PTFE)/Al/CuO organic-inorganic hybrid energetic film was successfully obtained using the above method for the first time. The addition of lithocholic acid as a surfactant into the electroplating suspension enabled PTFE to be charged. The combustion and energy release were analyzed by means of a high-speed camera and differential scanning calorimetery (DSC). It was found that the combustion process and energy release of PTFE/Al/CuO were much better than that of Al/CuO. The main reason for the excellent combustion performance of the hybrid PTFE/Al/CuO system was that the oxidability of PTFE accelerated the redox reaction between Al and CuO. The prepared PTFE/Al/CuO film was also employed as ignition material to fire a B–KNO 3 explosive successfully, indicating considerable potential for use as an ignition material in micro-ignitors. This study sheds light on the preparation of fluoropolymer-containing organic-inorganic hybrid energetic films by one-step electrophoretic deposition.
研究领域:
材料科学
·
含能材料
·
电化学
·
燃烧物理
✓ 已验证
DOI
高影响因子
FIBERS AND POLYMERS
·
2020
·Vol. 21
·期 5
·1126-1133
·
IF 1.797
Meng Yang,Zhang Bin,Su Juanjuan,Han Jian
Inspired by the layered structure and oriented materials, this study exhibits a reinforcement and antibacterial composite consisted by polytetrafluoroethylene/glass fiber (PTFE/GF) composites and QACMt. The QACMt used as an organically modified layered particle is fabricated by a method that montmorillonite (Mt) is modified with quaternary ammonium compounds (QAC). Owing to the composites have a unique layered structure, it was considered as an ideal reinforcement to strengthen polymer. Importantly, the tensile strength and toughness of PTFE/GF composites are achieved the maximal value of 25.5 MPa and 18.1 MJ/m 3 , respectively. Additionally, the QACMt exhibits good antibacterial activities against S. aureus and E. coli. This work guides a layered structure to achieve exceptionally high strength and toughness, antibacterial properties.
研究领域:
材料科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2020
·
IF 4.469
Yadong Yu,Lei Chen,Ding Weng,Jiadao Wang,Chaolang Chen,Awais Mahmood
Ice accretion is detrimental for the safety of transmission lines, aircraft, and buildings, which may also result in economic loss. In this study, a thin polytetrafluoroethylene (PTFE) coating on the aluminum substrate was fabricated by electrostatic attraction self-assembly technique and proposed for large-scale deicing application. The shear-force F i c e analysis on deicing and related ice adhesion is conducted while interfacial toughness between solid-ice interfaces was also measured. Moreover, the surface morphology, wettability of the PTFE coated aluminum plate was also characterized. It was observed that the critical bonded length L c between ice and PTFE coated surface is about 2.85 cm. When the bonded length L was higher than this value, the shear-force of dislodging ice could stay constant at about 50 N for the first deicing cycle. From the second deicing cycle, the constant shear-force is increased to 70 N and kept constant for at least ten cycles. Meanwhile, the surface roughness and water contact angle kept on increasing along with the loss of PTFE nanoparticles during icing-deicing cycles. Ultimately, An ice layer with the size of 98 cm × 96 cm×1 cm (L × w×h) was developed on the surface of PTFE coated aluminum substrate for the demonstration of its fracture and falling off under ice’s weight.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）