POLYMER
·
2025
·
IF 4.5
Zhongli Zhang,Zhensheng Wu,Shuai Zheng,Haitao Yang,Fuqiang Tian
Aromatic polyimide (PI) is widely used in aerospace, microelectronics, and transformer insulation due to its excellent performance and design flexibility. With the rapid development of the military industry, the insulation layer of Tesla transformer windings demands low dielectric, high heat resistance, high breakdown strength, and aging resistance. This paper studies the performance of polyimide insulation film based on theoretical calculation and experimental methods. We used molecular simulation technology and density functional theory (DFT) to study the microscopic electrical and optical properties of polyimide molecules with eight structures, which saved time for subsequent experimental design. Then, we studied ordinary polyimide film, fluorinated polyimide film, and polyimide film with mica filler using experimental methods. We also analyzed the dielectric, electrical, and ageing properties of polyimide composites and finally prepared polyimide composites with excellent comprehensive performance.
研究领域:
材料科学
·
电气工程
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产品关联
DOI
高影响因子
Minerals
·
2024
·Vol. 14
·期 7
·694
·
IF 2.2
Xinyu Zhang,Liuyi Ren,Shenxu Bao,Yimin Zhang,Guohao Chen,Bo Chen
Flotation-introduced nanobubbles were expected to be an efficient and economical method to recover fine muscovite. This study aimed to explore the mechanism of the change appearing in flotation after introducing nanobubbles through micro-flotation, particle vision and measurement, flotation kinetics, and induction time measurement. The results of micro-flotation, which respectively feed muscovite or muscovite pretreated with nanobubbles in different concentrations of dodecylamine (DDA), were fitted with four flotation kinetic models using Origin. Different methods were used to examine how the introduction of nanobubbles affected the flotation process. The results showed that nanobubbles improved both the flotation rate and recovery of muscovite. Nanobubbles played different roles in different stirring intensities. At low stirring intensity, nanobubbles did not perform well. In suitable stirring intensity, nanobubbles helped particles aggregate and improved the collision probability between bubbles and minerals. However, at high stirring intensity, shear forces caused by ultra-high fluid velocities could disrupt particle aggregation.
研究领域:
矿物加工工程
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Hanhan Huang,Caifeng Xia,Derui Liang,Yuan Xie,Fanping Kong,Jinxiu Fu,Zhiwen Dou,Qinghua Yang,Wenjing Suo,Qian Zhang,Zilin Meng
Novel biotite (Bt) supported different amounts of Mg-Al layered double hydroxide (LDH@Bt) with a three-dimensional hierarchical structure was fabricated via in-situ growth method. The structural and morphology characterization indicate that LDHs stably and uniformly dispersed on Bt surface, but excessive LDHs still lead to obvious aggregation of LDHs. The removal performance of LDH@Bt for heavy metal of Cu 2+ /Pb 2+ and pesticides of glyphosate (GLY)/2-methyl-4-chlorophenoxyacetic acid (MCP) in soil was investigated, and the removal rates of LDH@Bt composite for four contaminants were higher than those of LDHs and Bt. Intraparticle diffusion and pseudo-second-order model well described the kinetics of heavy metals and pesticides removal. Adsorption isotherm data of Cu 2+ and Pb 2+ yielded better accordance of Freundlich model, while data of GLY and MCP were fitted Langmuir model well. In addition, different adsorption mechanisms for removal of Cu 2+ /Pb 2+ by precipitation and removal of GLY/MCP by surface adsorption were proposed. The application performance and recovery ability of LDH@Bt composite in soil were evaluated by column leaching experiments and magnetic collectability tests. The excellent removal performance and magnetic collectability provided a promising strategy for remediation and elimination of heavy metals and pesticides contaminations from soil.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Journal of Coatings Technology and Research
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2024
·
IF 2.3
Da Yaling,Xue Xiangxin
Ultraviolet curable composite coatings are an eco-friendly option with the absence of volatile organic compound emissions. Achieving a better interface between epoxy acrylate (EA) and mica is essential for the enhanced mechanical and barrier properties of composite coatings. This paper presents a strategy for modifying mica through in situ grafting with various silane coupling agents (KH550, KH560, and KH570) and preparing composite coatings of EA/mica using a blending method. The results indicate that the silane-modified mica exhibited enhanced compatibility with EA coatings. The mechanical properties, thermal stability, and corrosion resistance of epoxy acrylate/silane-modified mica coatings were improved compared to epoxy acrylate/unmodified mica composite coatings. KH570 was found to be the most effective modifier for enhancing these properties of the coatings. Relative to EA/unmodified mica composite coating, the impact resistance of EA/KH570-modified mica composite coatings doubled, with increases in T 5 and T 10 by 49.7°C and 9.7°C, respectively. During the 9 day monitoring period using electrochemical impedance spectroscopy, the total impedance modulus | Z | f =0.01 Hz of EA/KH570-modified mica composite coatings was discovered to be 6–9 times higher than that of unmodified mica coatings, with the R t value higher by two orders of magnitude.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Le Zhang,Ying Liu,Xuan Wang,Daimei Chen,Hao Ding
The superhydrophobic surface like lotus leaf had important application prospects in the field of self-cleaning of building exterior walls. However, its single function and poor UV-aging resistance severely limited its practical application. In this study, sericite, an inorganic UV-shielding material with UV absorption properties, was selected as carrier to prepared sericite-TiO 2 composite particles by hydrothermal method. Then, it was modified with hexadecyltrimethoxysilane (HDTMS) and sprayed onto the substrate’s surfaces, forming a superhydrophobic coating with photocatalytic performance and UV-aging resistance. The results showed that the prepared nano-TiO 2 was rutile and uniformly loaded on the sericite surface. The sericite-TiO 2 /HDTMS coating exhibited lotus-like superhydrophobic property with water contact angle (WCA) and water slide angle (WSA) of 154.7° and 2.1°, respectively. The coating also showed photocatalytic performance, and 35.8% of 10 ppm methyl orange solution can be degraded under UV light in 50 min. Due to the fact that sericite was an inorganic UV-shielding agent, the as-prepared coating showed UV-aging property. After UV irradiation for 40 h, WCA of the surface still approach 150°. The sericite-TiO 2 /HDTMS coating not only had self-cleaning performance and UV-aging property, but also the potential for practical applications.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2023
·
IF 5.6
Xuan Wang,Hao Ding,Zhuoqun Xu,Jianmeng Zhang,Yanbin Yao
To enhance the anti-aging property of a superhydrophobic self-cleaning coating, rutile nano-TiO 2 was loaded onto the surface of sericite via wet grinding method to prepare sericite-rutile composite particles. Then, the composite was modified with hexadecyltrimethoxysilane (HDTMS) and sprayed onto the substrates surfaces to prepare sericite-rutile/HDTMS composite coatings with both UV shielding and superhydrophobic self-cleaning properties. The structure, properties, and mechanism of the coating were studied. The research showed that the micro-nanoscale hierarchical structure has been constructed by compositing sericite and rutile, which were the structure foundation of superhydrophobic coatings. The sericite-rutile composite was modified with HDTMS and sprayed onto the substrates forming a superhydrophobic self-cleaning coating. Water contact angles (WCAs) and slide angles (SAs) of the coating were 155.3° and 1.3°, respectively. The sericite-rutile/HDTMS coating exhibited good UV shielding and anti-aging properties. Its UV shielding rate was 93.53%, which was equivalent to that of pure rutile (94.27%). After UV irradiation for 80 h, the surface maintained superhydrophobicity, and the chromaticity of the coating surface did not change. The superhydrophobicity and low adhesion to water of the sericite-rutile/HDTMS coating are due to the micro-nano hierarchical structure of the sericite-rutile composite and the low surface energy of HDTMS. The UV shielding effect of the coating is mainly due to the strong absorption of UV light by the sericite-rutile composite. This work provides a simple and environmentally friendly method for constructing a coating with UV shielding and superhydrophobic self-cleaning properties.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
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2025
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IF 3.5
Wang Zhan,Jinhong Mo,Lingling Tang,Fan Shi,Le Chen,Lixia Li,Mingyi Chen,Qinghong Kong,Ru Zhou,Juncheng Jiang
Considering that the poor mechanical properties limit the application of SiO 2 aerogels in fire insulation, polyurethane sponges, and mica were used to enhance the mechanical properties of SiO 2 aerogels in this study. The effects of polyurethane sponges with different pore sizes and mica content on the thermal-mechanical properties of composite aerogels were investigated. The internal structure of the composite aerogels was analyzed by scanning electron microscopy. Moreover, the chemical structure and composition of the composite aerogels were characterized and analyzed. The results demonstrate that polyurethane sponges and mica can effectively enhance the mechanical properties of composite aerogels. However, the addition of mica increased the thermal conductivity. The experimental data will further expand the engineering application of SiO 2 aerogels.
研究领域:
材料科学
·
热能工程
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
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IF 7.632
Zhiqiang Huang,Shiyong Zhang,Chen Cheng,Hongling Wang,Rukuan Liu,Yajing Hu,Guichun He,Xinyang Yu,Weng Fu
On January 25, 2019, the tailings dam at Vale’s Córrego do Feijao mine (Brumadinho, Minas Gerais, Brazil) ruptured, releasing about 12 million cubic meters of tailings, killing over 240 people and posing a considerable and ongoing environmental hazard. Thus, the recovery of valuable minerals from tailings can contribute to a sustainable disposal of this hazardous residue, saving human lives and protecting the environment. The tailings of a tantalum–niobium mine usually contain a considerable amount of lepidolite resource. Nonetheless, the method of sustainably acquiring the lepidolite resource from tailings of a tantalum–niobium mine at low-temperature environments has always been needed. In this study, we synthesize a new amine-based gemini surfactant, butanediyl-α,ω-bis(dimethyldodecylammonium bromide) (BDB). It is introduced as a collector in the flotation of lepidolite from the tantalum–niobium mine tailings for the first time at low temperatures. We compare its capability to collect lepidolite with the monomeric surfactant 1-dodecylamine (DA). In bench-scale flotation experiments, the Li2O recovery of lepidolite concentrate with 80 g/t BDB was 10.96% and 31.85% higher than that with 160 g/t DA at 298 and 275 K, respectively, which indicated that BDB is a better collector for lepidolite than DA. BDB is a novel and superior collector for disposing of lepidolite tailings ponds.
研究领域:
矿物加工工程
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环境科学
·
材料化学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2023
·
IF 13.1
Ziheng Bai,Shan Meng,Yexiang Cui,Yue Sun,Luchao Pei,Haodong Hu,Yuanxu Jiang,Huaiyuan Wang
Traditional single-function anticorrosion coatings have been unable to meet the needs for long-term protection in harsh marine environments. Therefore, developing excellent multifunctional protection coatings is essential for prolonging the service life of marine industry materials. Herein, a stable multifunctional linkage anticorrosion composite coating SC/SFPani@Zn was successfully constructed by loading the magic box (SFPani: fluorinated polyaniline doped with p-toluenesulfonic acid) and active factor (Zn 2+ ) onto the surface of sericite (SC). The SC sheet weakens the easy self-agglomeration problem of polyaniline, improves the interfacial compatibility between the filler and the resin matrix , and enhances the barrier properties of the coating. More importantly, the functional role of “magic box” and “active factor” not only enhance the shielding performance of the coating but also endows the coating with good corrosion inhibition performance and functional response protection. The 3D hydrophobic network and multifunctional linkage protection system gives the SC/SFPani@Zn coating excellent long-term corrosion resistance in harsh seawater as compared to conventional epoxy coatings . Therefore, it is believed that this work not only reflects the application potential of SC/SFPani@Zn as long-term anticorrosive material but also provides a new idea for the design of protective coatings for marine building materials .
研究领域:
材料科学
·
海洋工程
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产品关联
DOI
高影响因子
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
·
2024
·Vol. 47
·期 1
·1-18
·
IF 3.2
Gong Huichun,Ke Pingchao,Zhou Yipeng,Xu Lingling,He Guang,Jian Peng
Fluoride contamination is a serious environmental problem in lepidolite hydrometallurgy wastewater. The treatment of fluoride-bearing wastewater is challenging because of the presence of coexisting ions including lithium (Li + ), rubidium (Rb + ), silicate (SiO 3 2− ), sulfate radical (SO 4 2− ). However, aluminum-modified zeolite (Al@zeolite) with sufficient hydroxyl groups and high adaptability has unique advantages for eliminating fluoride from lepidolite hydrometallurgy wastewater. Al@zeolite was prepared on natural zeolite by an atmospheric process and then used for the adsorption of fluorine from fluoride-bearing wastewater produced by the lepidolite hydrometallurgy process. The results of material characterization confirmed the successful immobilization of aluminum within the zeolite pores and indicated the formation of zeolite-Al–OH. The zeolite host significantly enhanced the chemical stability of Al@zeolite against pH changes for a wide pH range of 2.0–10.0. The adsorbent had a surface area of 33.46 m 2 /g and demonstrated excellent capacity and selectivity for fluoride adsorption. Notably, a maximum adsorption of 98.6% was observed at a pH value of 6.0 for a duration of 20 min with a fluoride content of 20 mg/L, and the equilibrium concentration decreased to 0.4 mg/L. The results of fluorine adsorption showed that fluoride uptake onto Al@zeolite agreed well with the pseudo-second-order kinetic model and the Langmuir isotherm model. The reusability of the substance was evaluated for up to eight cycles following consecutive regeneration with 0.2 mol/L AlCl 3 . The exhausted Al@zeolite was effectively regenerated through simple alkaline treatment for recycling. The above results verified that Al@zeolite is a new kind of efficient defluoridation adsorbent for lepidolite hydrometallurgy wastewater with practical application prospects.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2021
·
IF 6.789
Qiang Zeng,Hui Zhong,Zhiguo He,Liang Hu
Developing materials from natural minerals to efficiently remove arsenite (As(Ⅲ)) from solution is vital important for resources comprehensive utilization and environment protection. In this study, biotite containing minerals was used to prepare a novel composite of amino modified silica supported MnO 2 /Fe–Al hydroxide (SNMFA composite), which was then applied to remove arsenite. Scanning electron microscope (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) results indicated that many amorphous MnO 2 and Fe–Al hydroxide nano sheets were loaded on the surface of layered silica structure. Batch experiments showed that this composite could efficiently remove As(Ⅲ) from aqueous solution, and the maximal removal capacity was identified as 46.11 mg/g. As(Ⅲ) adsorption behaviours of SNMFA composite were confirmed by the pseudo-second-order kinetic model and Langmuir model, indicating that As(Ⅲ) adsorption on its surface was monolayer adsorption. The adsorption process was a pH and temperature dependent process, and increasing pH and temperature have facilitated the removal of As(Ⅲ). Thermodynamic analysis showed that As(Ⅲ) adsorption process was a spontaneous endothermic reaction . The As(Ⅲ) removal was mainly relied on the stable inner-sphere coordination model, and the corresponding mechanisms were involved in chelation, precipitation, oxidation-adsorption and electrostatic interaction.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
·
IF 2.843
Jing Huang,Yaxin Qiu,Defeng Wu,Jun Wang
A new approach to improve the thermal stability and mechanical strength of thermoplastic polyester elastomer (TPEE) using spodumene slag as the filler is reported here. The thermal decomposition temperature of TPEE increases from 277 °C to about 350 °C by about 26% in the presence of pristine spodumene slag. The surface graft reaction further improves its barrier effect. Besides, spodumene slag can be used as a good reinforcement to TPEE, and also the surface treatment favors further improvement of its reinforcing effect. However, the presence of spodumene slag reduces the elastoplasticity and viscoplasticity of the system, leading to decreased tensile cycles and elongation levels. The morphological and crystallographic methods were then employed to further reveal the alteration of the phase separation structure of TPEE in the presence of spodumene slag, aiming at establishing structure–property relations of composites. This work can provide useful information on the preparation of new TPEE composites with tailorable properties.
研究领域:
材料科学
·
复合材料
✓ 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）