Polymers
·
2022
·Vol. 14
·期 2
·322
·
IF 4.967
Hong Qi,Qingshan Shi,Yuhai Qian,Yueming Li,Jingjun Xu,Caihong Xu,Zheng Zhang,Xiaobao Xie
In this work, the atomic oxygen (AO) erosion-resistance effect and mechanism of the Perhydropolysilazane (PHPS) coating were investigated from the perspective of element distribution in the depth direction. The results revealed that the coating demonstrated good adhesion and intrinsic AO erosion-resistance, which was attributed to the composition gradient formed in the coating. Moreover, the oxygen ratio of the SiOx on top layer of the coating could be elevated during AO exposure, strengthening the Ar ion etching durability of the coating. According to these results, an AO erosion-resistance mechanism model of the PHPS-derived SiOx coating was finally obtained.Keywords:PHPS;silica coating;atomic oxygen;erosion-corrosion;resistance mechanism
研究领域:
材料科学
·
航天工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 16
·11980-11988
·
IF 3.84
Guanghe Song,Xuesong Li,Qiyang Jiang,Jianxin Mu,Zhenhua Jiang
A series of novel structural phosphorus-containing polyimide–polyhedral oligomeric silsesquioxane (POSS) nanocomposites with varying phosphorus contents were synthesized. The nanocomposites displayed outstanding thermal properties. The glass transition temperature was increased to 294.87 °C when the phosphorus content was 1.61 wt% and the anti-degradation properties were also obviously enhanced. Moreover, the nanocomposites presented much higher atomic oxygen (AO) durability compared with pure polyimide because of the incorporation of special functional groups of phosphorus oxide and POSS. The AO erosion yields decreased to 51.9% of pure polyimide–POSS nanocomposites when the phosphorus content was increased to 1.61 wt%. Furthermore, the mechanism of phosphorus and POSS synergistic AO resistance was explored via XPS and SEM. Three kinds of silicon particles with different binding energies and two kinds of phosphorus elements with different binding energies were formed because of AO exposure and the phosphorus and POSS synergy. Highly effective self-passivating layers were formed to protect the underlying material from AO attack.
研究领域:
材料科学
·
航天工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 10
·2385
·
IF 5
Huimin Qi,Yang Lei,Xuemei Lei,Ding Zhang,Yafeng Zhang,Jiaxin Yu,Baogang Guo
Polyimide-bearing retainer has been successfully used in space environment. However, the structural damage of polyimide induced by space irradiation limits its wide use. In order to further improve the atomic oxygen resistance of polyimide and comprehensively investigate the tribological mechanism of polyimide composites exposed in simulate space environment, 3-amino-polyhedral oligomeric silsesquioxane (NH2-POSS) was incorporated into a polyimide molecular chain and silica (SiO2) nanoparticles were in situ added into polyimide matrix and the combined effect of vacuum environment, and atomic oxygen (AO) on the tribological performance of polyimide was studied using bearing steel as the counterpart by a ball on disk tribometer. XPS analysis demonstrated the formation of protective layer induced by AO. The wear resistance of polyimide after modification was enhanced under AO attack. FIB-TEM confirmed that the inert protective layer of Si was formed on the counterpart during the sliding process. Mechanisms behind this are discussed based on the systematic characterization of worn surfaces of the samples and the tribofilms formed on the counterbody.Keywords:polyimide;NH2-POSS;tribological properties;atomic oxygen;tribofilm
研究领域:
材料科学
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航天工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FIBERS AND POLYMERS
·
2025
·
IF 2.3
Zhang Sheng,Wu Bingjie,Song Bo,Chen Tao,Li Qing,Wu Guangshun,Chen Lei
When a spacecraft works in low earth orbit, PBO fiber/epoxy resin composite as structural material not only has the poor interfacial properties, but also faces the attack of atomic oxygen (AO). To solve the two drawbacks, a PBO fiber hierarchical reinforcement has been fabricated without degrading the fiber by a mussel-inspired "two-step" method based on dopamine (DA) assistant co-deposition and chemical grafting technologies. The surface wettability, roughness (Ra) and reactivity of the obtained PBO@PDA-Si-GO are increased significantly in comparison with those of untreated one. The reinforcement offered simultaneously remarkable enhancement in interfacial shear strength (IFSS) and AO erosion resistance of the composites, which laid theoretical and experimental foundations for the realization of the structure/function integration design of advanced composites.
研究领域:
材料科学
·
航天工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Zhu Ren,Shuo Chen,Shun-Feng Jiang,Wei-Fei Hu,Hong Jiang
In this study, a solar/chlorine/graphitic carbon nitride (g-C3N4) system for the highly efficient degradation of carbamazepine (CBZ) was constructed, and the degradation mechanism of CBZ in this system was elucidated. The removal rate of CBZ by g-C3N4 combined with solar/chlorine was as high as 97.8%, which was more than twice that of the solar/chlorine combined system (43.8%). Electron spin resonance analysis revealed that the hydroxyl radicals (HO•) in the solar/chlorine/g-C3N4 system were remarkably less than that in the solar/chlorine photocatalytic system, wherein HO• was the dominant participant. However, the former system had higher efficiency than the latter. Scavenging tests confirmed the existence of a synergistic effect between solar/chlorine and g-C3N4 in CBZ degradation, and ground-state atomic oxygen (O(3P)) played a more important role than HO• in the solar/chlorine/g-C3N4 system. A novel O3-related pathway of CBZ degradation was proposed on the basis of the determination of intermediates. The intermediates detected via liquid chromatography quadrupole time of flight mass spectrometry (LC/Q-TOF-MS)/MS analysis indicated that O3 attacked the double bond of CBZ via the Criegee mechanism and produced intermediates with two new aldehydes. This study not only improved the knowledge of the effects of O(3P) and the O(3P)-related degradation mechanism of organic pollutants but also provided a reminder that O(3P) might be overlooked in the photocatalytic processes, especially in processes that occur in the presence of dissolved oxygen or oxygen-containing anions.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2023
·
IF 6.2
Xinle Yao,Yanzhao He,Yuxiong Guo,Zhongying Ji,Chufeng Sun,Xin Jia,Xiaolong Wang,Feng Zhou
To address the requirements of polyimide (PI) parts in the harsh Low Earth Orbit (LEO), a 3D printable PI composite with superior tribological and atomic oxygen (AO) irradiation resistant properties was proposed by employing methacryloxypropyl polyhedral oligomeric silsesquioxane (MPA-POSS) as a crosslinking agent in the photosensitive PI inks to obtain POSS-contained PI composite (PI-POSS composite). The resultant PI-POSS exhibits unique comprehensive performance including excellent AO irradiation resistance of an erosion yield of 2.86 × 10 −24 cm 3 /atom, 50 % lower than that of PI without POSS, and anti-wear and friction reducing properties with a coefficient of friction of 0.1 and a wear rate of 4.4 × 10 −6 mm 3 /N∙m. Importantly, the PI-POSS inks have excellent VP 3D printability, enabling the creation of complex, AO irradiation resistant, self-lubricating PI-POSS parts. These findings highlights the significant potential of such PI-POSS composite in aerospace applications within LEO.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2021
·
IF 4.43
Lei Chen,Gangyan Zhang,Guangshun Wu,Peng Wang,Yuanming Zhang,Minghua Li,Qing Li,Tonghua Zhang
The surface of poly( p -phenylene benzobisoxazole) (PBO) fibers was modified by a hybrid coating composed of polydopamine (PDA) and the hydrolysis products of 3-aminopropyltrimethoxysilane (KH551) using a facile and environment-friendly mussel-inspired co-deposition strategy. The surface morphologies and chemical composition of the obtained hierarchical reinforcement (PBO@PDA/Si) were measured for confirming the successful deposition of the coating. Compared to untreated PBO fiber, the surface roughness and wettability of PBO@PDA/Si were increased remarkably. Importantly, PBO@PDA/Si showed a 50.2% increase in the interfacial shear strength (IFSS) of resulting composite without any decrease in its tensile strength (TS). In addition, its atomic oxygen (AO) erosion and hydrothermal aging resistances were significantly improved. The “one-step” mussel-inspired surface modification strategy starts from simple chemistry and cheap raw materials, and may provide a novel and versatile design for fabricating multifunctional hierarchical reinforcements.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Dan Wang,Jusha Ma,Pengfei Li,Lin Fan,Yuemin Wu,Zongbo Zhang,Caihong Xu,Lei Jiang
Lightweight, long lifetime, and flexible polymer membrane-based structures, which are tightly folded on the ground and then unfolded in space, suffer from repeated bending before launching and fatal erosion on exposure to atomic oxygen (AO) in a low Earth orbit (LEO). Although various AO-resistant coatings have been developed, a coating that can simultaneously meet the critical requirements for the mechanical robustness and long-term protection of polymer membranes is rare. Here, we fabricated a coating with mechanical robustness and long-term space endurance, starting from an inorganic polymer precursor. A hybrid coating with a nanoscale polymer/silica bicontinuous phase is first prepared on the ground, which exhibits outstanding flexibility and excellent abrasion resistance. Then, the coating shows an in situ self-evolution behavior under AO and ultraviolet (UV) synergism to afford dense and crack-free silica coating with outstanding endurance. Our strategy displays great potential for protecting deployable membrane structures serving in the LEO.
研究领域:
材料科学
·
航天工程
✓ 已验证
DOI
高影响因子
ACS Catalysis
·
2024
·
IF 11.3
Minghui Cui,Rongjing Guo,Yansong Zhou,Wenqi Zhao,Yanjing Liu,Wenbo Luo,Qiongrong Ou,Shuyu Zhang
The efficiency of hydrogen production from water electrolysis is mainly restricted by the sluggish oxygen evolution reaction (OER). The mainstream adsorbate evolution mechanism and lattice oxygen-mediated mechanism face a trade-off between performance and stability, while the diatomic oxygen mechanism (DOM) based on the O–O coupling provides a solution to overcome this limitation. However, the intrinsic principles that facilitate the O–O coupling remain unclear, which complicates material design. In this work, we use spinel Co3O4 as a model and identify that the asymmetric sites formed by the octahedral Co with O defects and the original octahedral Co are effective sites for O–O coupling. Based on this, we propose using the degree of asymmetry of the dual site as a descriptor to quantify the reaction free energy of rate-determining step along the DOM pathway, presenting a volcano plot relationship. Experimental validation shows that plasma-prepared Co3O4 enables O–O coupling, requiring only 287 and 420 mV overpotentials to achieve current densities of 10 and 1000 mA cm–2 in 0.5 M H2SO4, respectively. This work demonstrates efficient sites for the OER along the DOM pathway in Co3O4, providing valuable insights for designing high-performance OER catalysts.
研究领域:
材料科学
·
电催化
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Chi Yan,Jialin Li,Yuhao Dai,ZhiJiang Lan,Haobo Wang,Hua Tong,Xiaojun Ye,Xiao Yuan,Cui Liu,Hongbo Li
Polyimide (PI), commonly used in space applications, is vulnerable to atomic oxygen (AO) erosion in low Earth orbit, causing performance degradation. Atomic layer deposition (ALD) of ultrathin films has great potential as AO protective coatings for aerospace materials. In this study, nanometer-thick plasma-enhanced atomic layer deposition (PEALD) SiO 2 films were deposited on in-situ oxygen plasma-activated PI surfaces. The nucleation and growth process of SiO 2 was systematically analyzed. A uniform and dense SiO 2 film was formed, providing limited resistance to AO erosion, but not sufficient for extreme environmental conditions. To further enhance AO resistance, we introduced thermal ALD-Al 2 O 3 interlayers within the same processing window and alternately deposited conformal, continuous Al 2 O 3 /SiO 2 nanolaminates on the PI surface. The Al 2 O 3 interlayer effectively reduced the film deposition roughness, forming a smoother, denser barrier layer and minimizing growth defects. This dense ALD-Al 2 O 3 /SiO 2 nanolaminate, with its inert Si-O-Al bonds, effectively prevents AO from penetrating the substrate, showing superior protection under long-term AO exposure. After AO irradiation, the surface remained smooth with no obvious defects or voids, effectively avoiding undercutting caused by AO. The synergistic effect of alumina and silica provides excellent AO protection while maintaining good optical transmittance.
研究领域:
材料科学
·
航天工程
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2023
·Vol. 16
·期 14
·e202300312
·
IF 8.4
Huanyu Xie,Pai Li,Shuai Xie,Hongchang Jin,Song Jin,Xianghua Kong,Zhenyu Li,Hengxing Ji
Graphical Three is better : Porous organic frameworks is prepared via coupling reaction of diazonium salt as the anode for Li-ion storage, which exhibit high reversible capacities with excellent cycle stability and rate performance. The azo group acts as an electrochemical active site reversibly bonding with Li-ions, and the adjacent oxygen atom electrostatically adsorb Li-ions to promote the lithium storage. Due to the designable structure and capacity, organic materials are promising candidates for lithium-ion batteries. Herein, we report a novel type of porous organic frameworks (POFs) based on the coupling reaction of diazonium salt as the anodes for lithium ion storage. The active center containing an azo group and the adjacent lithium-philic adsorption site is constructed to investigate the electrochemical behaviors and reaction mechanism. As synthesized POF material (named as POF-AN) exhibits high reversible lithium storage capacities of 523 mAh g −1 at 0.5 A g −1 and 445 mAh g −1 at 2.0 A g −1 after 1500 cycles, showing excellent cycle stability and rate performance. The detailed characterizations reveal that the azo group can act as an electrochemical active site that reversibly bonds with Li-ions, and the adjacent oxygen atoms can electrostatically adsorb with Li-ions to promote the lithium storage reaction. This adsorption-assisted three-atom redox center is beneficial to synergistically enhance the adsorption and intercalation of lithium ions, which can further improve the capacity and cycle stability. By replacing the precursor, it is also facile to synthesize more similar structure types. The reversible redox chemistry of the adsorption-assisted three-atom active center provides new opportunities for the development of long lifespan and high-rate organic anodes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 89
·72971-72980
·
IF 3.84
Zenghui Yang,Qihua Wang,Yongkang Bai,Tingmei Wang
Shape memory polyimide/silica (PI/silica) composites with atomic oxygen resistance, good thermal stability and mechanical properties are synthesized by co-condensation of poly(amic acid) terminated with (3-aminopropy)triethoxysilane (APTES) and tetraethoxysliane (TEOS) via a sol–gel method. The silica networks formed in the hybrid films act not only as permanent crosslink points, but as atomic oxygen (AO) resistant moieties. The results show that the PI/silica composite films possess high thermal decomposition temperature (Td > 550 °C), high glass transition temperature (Tg > 265 °C) as well as good shape fixation ratio (Rf > 98%) and shape recovery ratio (Rr > 90%). The mechanical properties, surface topography and shape memory performance of PI/silica composite films were evaluated before and after AO irradiation in simulated space environment. Compared to pristine PI, the mechanical properties, surface topography, and shape memory performances of PI–SiO2-15 were less affected by AO exposure, which results from the silica protective layer formed on the composite film surface, indicating good AO-resistant ability of PI/silica composite films. This work may provide a strategy toward the design of promising shape memory materials for applications in the field of severe conditions.
研究领域:
材料科学
·
航空航天工程
✓ 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）