JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2023
·Vol. 148
·期 12
·5235-5246
·
IF 4.4
Liu Jie,Yu Haomiao,Wang Deqi,Sun Sensen,Li Fengsheng
In order to improve the mechanical and combustion properties of composite solid propellant, the CuO@AP with core–shell structure was prepared by solvent–nonsolvent recrystallization method, and it was applied to AP/HTPB composite solid propellant. The thermal decomposition properties, sensitivity properties and tensile properties of CuO@AP propellant were studied and compared with ultrafine AP propellant, ultrafine spherical AP propellant and the mixture of CuO and AP (CuO/AP) propellant. The results show that the E a of ultrafine spherical AP propellant is 8.16% lower than that of ultrafine AP propellant with the same particle size, and the rate constant increases by 13.64%; the E a of the CuO@AP propellant is 23.63% lower than that of CuO/AP propellant with ultrafine AP of the same particle size, and the rate constant increases by 172.7%. What’s more, the catalytic effect of CuO@AP is obviously better than that of CuO/AP. The impact sensitivity of ultrafine spherical AP propellant is 29.61% lower than that of ultrafine AP propellant with the same particle size, and the ε b is increased by 51.35%. The impact sensitivity of the CuO@AP propellant is 25.38% lower than that of CuO/AP propellant with ultrafine AP of the same particle size, and the ε b is increased by 63.76%. The above shows that the CuO@AP composite particles with core–shell structure have potential application prospects in AP/HTPB propellant.
研究领域:
推进剂科学
·
材料科学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
·
2021
·
IF 2.826
Huimin Li,Shaofan Guo,Lu Wang
This paper reports a new voltammetric method for detection of bisphenol AP (BPAP) with high sensitivity, which is based on a new electrochemical sensor from a three-component composite-modified glassy carbon electrode. The composite was characterised by various surface, structural and electrochemical analysis techniques, such as transmission electron microscopy (TEM), scanning electron microscopy (SEM), Infrared Spectrum (IR), X-ray diffraction (XRD), Energy Dispersive X-Ray Spectroscopy (EDX) and Cyclic voltammograms (CV). The sensor had a well voltammetric response to BPAP, and the linear response ranges from 0.005 μM ~7 μM with the detection limits of 2 nM (S/N = 3). Finally, this system was utilised for determining BPAP in industrial wastewater using the standard addition method.
研究领域:
环境科学
·
分析化学
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产品关联
DOI
高影响因子
COMBUSTION AND FLAME
·
2024
·
IF 5.8
Ruixuan Xu,Xin Li,Zhihua Xue,Danfeng Yang,Suhang Chen,Kangzhen Xu,Qi-Long Yan,Hongqi Nie
In this work, the combustion enhancement and agglomeration inhibition of HTPB-based composite propellants have been achieved by incorporation of Al@AP composites containing a nitrogen-rich compound 4,4′,6,6′-tetra(hydrazino)hydrazo-1,3,5-triazine (THHT) as a burning rate modifier. The thermal reactivity and decomposition behavior of Al@AP/THHT composites were studied using DSC/TGA/FT-IR techniques. These composites showed a greater heat release with lower decomposition peak temperature. The propellant formulations could be well tuned by adjusting the mutual distance between Al/AP and THHT crystals. The results suggest that the inclusion of Al@AP/THHT in solid propellants would lead to enhanced energy release, with the value of explosion heat increased from 5632.0 J g -1 to 5971 J g -1 (+6.0 %), the ignition delay time decreased from 105 ms to 79 ms (-24.8 %) and the flame radiation intensity maximum raised from 2199 to 1988 (+10.6 %). The modified propellants are featured with a chemical reaction-dependent flame propagation rate at lower pressure range (1∼10 MPa) and a pressure-controlled process over 10 MPa. The burning rate of propellant at 1 MPa can be increased from 6.1 mm s -1 to 7.0 mm s -1 (+14.8 %) by the inclusion of Al@AP/THHT. The pressure exponent of modified propellants was reduced from 0.48 to 0.33 in pressure range 1∼15 MPa, which is mainly attributed to the activation of Al@AP at lower pressure. Furthermore, the inhibition of Al agglomeration was found once it was coated with AP. The characterizations on condensed combustion products (CCPs) demonstrated an enhancement in combustion efficiency due to an increased content of Al 2 O 3 , accompanied with a remarkable reduction of mean size from 14.0 μm to 1.3 μm (-90.7 %) and a rise in the proportion of nano-/micron-sized particles. The overall effects of Al@AP interfacial control and precise catalysis of THHT on the energy release and combustion of propellants were identified and the primitive combustion mechanisms are proposed.
研究领域:
推进剂化学
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燃烧科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Xiaorong Wu,Shiqi Li,Meijia Zhang,Shengjun Bai,Yangyue Ni,Qiaoqiao Xu,Yun Fan,Chuncheng Lu,Zhipeng Xu,Chenbo Ji,Guizhen Du,Yufeng Qin
Bisphenol AP (BPAP), a structural analog of bisphenol A (BPA), has been widely detected in environment and biota. BPAP was reported to interfere with hormone and metabolism, while limited data were available about its effects on neurobehavior, especially exposure to it during early-life time. A mouse model of early-life BPAP exposure was established to evaluate the long-term neurobehaviors in offspring . Collectively, early-life BPAP exposure caused anxiety-like behaviors and impaired learning and memory in adult offspring. Through brain bulk RNA-sequencing (RNA-seq), we found differential expressed genes were enriched in pathways related to behaviors and neurodevelopment, which were consistent with the observed phenotype. Besides, single-nucleus RNA-sequencing (snRNA-seq) showed BPAP exposure altered the transcriptome of microglia in hippocampus. Mechanistically, BPAP exposure induced inflammations in hippocampus through upregulating Iba-1 and activating the microglia. In addition, we observed that BPAP exposure could activate peripheral immunity and promote proportion of macrophages and activation of dendritic cells in the offspring. In conclusion, early-life exposure to BPAP impaired neurobehaviors in adult offspring accompanied with excessive activation of hippocampal microglia. Our findings provide new clues to the underlying mechanisms of BPAP's neurotoxic effects and therefore more cautions should be taken about BPAP.
研究领域:
毒理学
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神经科学
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免疫学
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产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2024
·
IF 3.7
Lei Xiao,Xinfei Wang,Tianfu Zhang,Xiaojun Feng,Kun Zhang,Junqing Yang,Xiaoming Jin,Gazi Hao,Wei Jiang
In order to achieve new energetic materials with high energy, low sensitivity, and moisture-proof properties, dihydroxylammonium 5,5′-bistetrazole-1,1′-diolate (TKX-50)/ammonium perchlorate (AP) cocrystal (molar ratio 1:1) was successfully prepared through a spray-assisted solvent–nonsolvent method. SEM shows that the morphology of the cocrystal is different from those of the two raw materials. XRD and FT-IR spectra indicate the formation of the cocrystal. The apparent activation energy of the cocrystal is lower than that of raw TKX-50. The characteristic drop height (H50) is higher than that of TKX-50, while the friction sensitivity (P) of the cocrystal is lower. In addition, the moisture-proof property of the cocrystal is improved, showing good application potential.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Yan-Xia Li,Zhong-Fei Zhang,Yu-Meng Wu,Le Shi,Hui-Xian Shen,Navindra P. Seeram,Hang Ma,Yong-Ming Lu
Ashwagandha ( Withania somnifera ) is a well-known medicinal plant, with polysaccharides recognized as key bioactive constituents. In this study, we isolated a neutral polysaccharide, AP-1, from ashwagandha roots and elucidated its structure. AP-1 has a molecular weight of 9.21 kDa and is primarily composed of mannose, glucose, and galactose in a molar ratio of 0.1:1.5:1. Spectroscopic analyses revealed that AP-1's backbone consists of 1,4-α-Glc p and 1,3-α-Gal p , with branching at the C-6 of 1,4,6-α-Glc p and C-4 of 1,3,4-α-Gal p positions. The immunostimulatory activity of AP-1 was evaluated in murine macrophage RAW264.7 cells. AP-1 significantly enhanced macrophage immune responses, promoted M1-type polarization, and activated the NF-κB signaling pathway. It increased the production and mRNAs expression of pro-inflammatory mediators including nitric oxide, oxygen species, tumor necrosis factor, interleukins-1β and -6, and upregulated the M1 surface biomarker CD86. These findings highlight the potential of AP-1 as a promising bioactive ingredient for functional foods targeting immune enhancement.
研究领域:
药用植物学
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免疫学
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生物化学
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产品关联
DOI
PubMed
高影响因子
POWDER TECHNOLOGY
·
2025
·
IF 4.6
Wenqing Li,Shimin Zhang,Songchao Shi,Xin Ruan,Qian Yang,Baoyun Ye,Chongwei An,Jingyu Wang
The proportion of oxidizer in the formulation of composite solid propellants (CSPs) is often more than 50 %. It is very important to explore the preparation of new high-energy oxidizers to improve the energy performance of CSPs. Porous CL-20/FOX-7@AP composite microspheres were prepared by combining high-energy density CL-20 and high safety FOX-7 with traditional oxidant AP through microchannel recrystallization technology coupled with solvent evaporation induced self-assembly technology. The experimental results show that the morphology of porous CL-20/FOX-7@AP composite microspheres is regular, and AP is uniformly attached to the surface of porous CL-20/FOX-7 composite microspheres. Compared with CL-20/FOX-7 composite microspheres, the oxygen balance of CL-20/FOX-7@AP increased from −14.12 % to −8.47 %, and the minimum impact excitation energy of CL-20/FOX-7@AP-1 and CL-20/FOX-7@AP-2 increased by 2.25 J and 3.25 J, respectively. When CL-20/FOX-7@AP-1 and CL-20/FOX-7@ AP-2 were used as new oxidants to replace 10 % AP in CSPs formula, the burning rate increased by 21.52 % and 27.85 % respectively, and the pressurization rate increased by 69.79 % and 75.44 % respectively. CL-20/FOX-7@AP composite microspheres with a porous synergistic core-shell structure are expected to be used as novel high-energy oxidants in CSPs to improve the energy density and energy release efficiency of CSPs.
研究领域:
材料科学
·
推进剂技术
✓ 已验证
产品关联
DOI
高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2021
·Vol. 46
·期 8
·1216-1226
·
IF 1.887
Shuang Xu,Ai-Min Pang,Zhuo Wu,Hai-Tao Li,Wei Li,Jie Kong
Two types of bonding agents were synthesized based on polyetheramines (PEAs), which aim to increase the strain of AP/CL-20/GAP formulation. The PEAs, terminated with cyano (CTPEA) and Schiff base (SBPEA) groups, were applied in the AP/CL-20/GAP formulation, respectively. The results showed that the bonding agents TCN-403 (CTPEA) and TBA-403 (SBPEA), which were prepared from trifunctional PEA named as T-403, could significantly increase the maximum elongation ratio of the formulation. The differences between the TCN-403 and TBA-403 were analyzed by DMA of the formulations, SEM of the coated fillers, and in-situ tensile test, indicating that the Schiff base bonding agents can effectively inhibit the dewetting of the binder from the solid particles in the formulations.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2025
·Vol. 15
·期 1
·1-19
·
IF 3.9
Sun Sen,Li Shengwei,Wang Yuanjing,Zhou Jinqiang,Pan Qi,Wu Chengcheng,Guo Xueyong
In order to solve the problems of low effective oxygen content, low density and high mechanical sensibility of ammonium perchlorate (AP) for propellant, potassium perchlorate (KP), which has a higher density and greater effective oxygen content, was introduced. An AP/KP composite oxidizer was prepared using electrostatic spraying. The morphology, structure, thermal properties, safety, and combustion performance of the samples were characterized using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and a quadruple coupling technique (TG-DSC-FTIR-MS). Comparative studies were performed with raw materials and physically mixed samples. The results indicate that the crystal structures of AP and KP remained unchanged in the composite oxidizers prepared using different methods. The electrostatic spray samples exhibited significantly improved safety compared to raw AP and physically mixed samples, with friction sensitivity reduced by 36% and 16%, respectively. Thermal analysis revealed that the electrostatic spray samples significantly enhanced the high-temperature decomposition of AP and KP, with decomposition peaks reduced by 49.15 °C and 9.67 °C, respectively. Additionally, the electrostatic spray method significantly reduced the activation energy of KP’s thermal decomposition from 448.32 to 440.62 kJ·mol − 1 to 222.80–226.11 kJ·mol − 1 . Compared to raw and physically mixed samples, the electrostatic spraying method reduced the ignition delay time of the composite oxidizer, increased the aluminum powder combustion rate, and enabled complete combustion of the Al powder. The electrostatic spraying method, with its adjustable process parameters and controllable sample morphology, enhances the overall performance of the composite oxidizer.
研究领域:
推进剂材料科学
·
燃烧与爆炸科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2021
·
IF 6.609
Ming Zhang,Fengqi Zhao,Ying Wang,Xueli Chen,Qing Pei,Huixiang Xu,Haixia Hao,Yanjing Yang,Hui Li
A novel graphene-ferrocene nanocomposite (G-792-Fe) was designed, prepared and characterized systemically using SEM, EDS, FTIR, XPS and RAMAN methods. The as-synthesized G-792-Fe was used as a multifunctional combustion catalyst in ammonium perchlorate-hydroxyl terminated polybutadiene (AP-HTPB) propellant, and the combustion, anti-migration, safety and mechanical performances of AP-HTPB propellant were revealed. The results showed that anchoring on the surface of graphene can effectively inhibit the migration and volatilization of ferrocene compounds in AP-HTPB propellant. The excellent combustion catalytic performance of G-792-Fe on AP-HTPB propellant (burning rate of AP-HTPB propellant containing G-792-Fe increases from 13.87 mm·s −1 to 17.28 mm·s −1 at 15 MPa) is attributed to its positive effect on AP decomposition, which generates more gas-phase products beneficial to the combustion surface thermal feedback and the gaseous REDOX reaction. Additionally, the G-792-Fe presents positive effects on reducing the electrostatic sensitivity and improving the mechanical properties of AP-HTPB propellant. The ignition energy ( E 50 ) and the maximum tensile strength (σ m ) of AP-HTPB propellant containing G-792-Fe were increased by 24.4 mJ and 0.75 MPa respectively, compared with AP-HTPB propellant containing catocene (156.8 mJ and 1.26 MPa). The positive effects of G-792-Fe on safety and mechanical performances of AP-HTPB propellant can be due the outstanding electrical and mechanical properties of graphene-based material. Results of this study have implications concerning design and application of multifunctional combustion catalyst, which can improve the combustion performance, anti-migration performance, safety performance and mechanical properties of AP-HTPB propellant.
研究领域:
材料科学
·
推进剂工程
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Xinjian Zhou,Ruixuan Xu,Hongqi Nie,Qilong Yan,Jun Liu,Yunlan Sun
Burning rate modulation is a crucial but challenging technology for designing solid propellants. The core–shell structured Al@AP and Al@AP/CuO were prepared and their thermal reaction properties were investigated at different pressures. The precise catalytic mechanism of doped CuO in oxidizer and the key reason for its burning rate modulating effect on solid propellants were elucidated by combining DFT calculations. The *NH 4 ClO 4 on the CuO (1 1 1) surface is more likely to undergo a dehydrogenation reaction first. The large difference in activation energy between *NH 4 ClO 4 →*NH 3 +*ClO 4 +*H and *NH 4 ClO 4 → NH 3 + HClO 4 explains the reasons that CuO can reduce the ignition delay of the Al@AP. CuO promotes the decomposition of the AP@Al at the low- and high-temperature decomposition (LTD and HTD) stage. For the Al@AP-CuO, the temperature of the high-temperature decomposition peak (THTD) does not shift to the lower temperature range with increasing pressure. These results are responsible for a reduction of pressure exponent in the presence of minor CuO as reported in the literature. CuO can facilitate the transformation process *NH 3 →*NH 2 on the CuO (1 1 1) surface at low-temperature and low-pressure conditions. However, at high-temperature and high-pressure conditions, it can inhibit the reaction *NH 2 →*NH→*N, so the burning rate of solid propellants can be controlled.
研究领域:
材料科学
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化学工程
·
计算化学
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产品关联
DOI
高影响因子
Carbon Letters
·
2019
·Vol. 30
·期 4
·425-434
·
IF 1.807
Wang Jingjing,Wang Weimin,Wang Jinghua,Xu Kangzhen
For solving phase separation of nanoparticles and graphene oxide (GO) in the application process, MgWO 4 –GO nanocomposites were successfully synthesized using three different dispersants via a facile solvothermal-assisted in situ synthesis method. The structure and morphology of the prepared samples were characterized by X-ray diffraction, Scanning electron microscopy, Transmission electron microscopy, Fourier transform infrared and Raman techniques. The experimental results show that MgWO 4 nanoparticles are tightly anchored on the surfaces of GO sheets and the agglomeration of MgWO 4 nanoparticles is significantly weakened. Additionally, MgWO 4 –GO nanocomposites are more stable than self-assembly MgWO 4 /GO, which there is no separation of MgWO 4 nanoparticles and GO sheets by ultrasound after 10 min. The catalytic results show that, compared with bare MgWO 4 , MgWO 4 –GO nanocomposites present better catalytic activities on the thermal decomposition of cyclotetramethylenete tranitramine (HMX), cyclotrimethylene trinitramine (RDX) and ammonium perchlorate (AP). The enhanced catalytic activity is mainly attributed to the synergistic effect of MgWO 4 nanoparticles and GO. MgWO 4 –GO prepared using urea as the dispersant has the smallest diameter and possesses the best catalytic action among the three MgWO 4 –GO nanocomposites, which make the decomposition temperature of HMX, RDX and AP reduce by 10.71, 11.09 and 66.6 °C, respectively, and the apparent activation energy of RDX decrease by 68.6 kJ mol −1 .
研究领域:
材料科学
·
化学工程
·
催化反应
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）