Scientific Reports
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2024
·Vol. 14
·期 1
·1-11
·
IF 3.8
Ren Jia,Cai Haopeng,Zhao Gaiqing,Xu Zhuang,Wang Xiaobo
The effects of shear degradation on the microstructures and properties of grease were investigated using a planetary ball mill to simulate a bearing shear zone on grease. The microstructure, cone penetration, colloidal stability, rheological properties noise properties, water washout characteristics and low-temperature torque of lithium grease were characterized. The microstructure of the initial lithium grease is a three-dimensional network structure formed by the uniform fibers. The entanglement level is high. As the ball milling shear time increases, the network structure of lithium grease is destroyed and the fibers are sheared to become short. Eventually all of them become short fibers. The performance test of lithium grease reveal that the cone penetration increases, colloidal stability, structural strength, noise properties, water washout characteristics of lithium grease gradually decreased with the increase of ball milling shear time. Additionally, the low-temperature starting torque and running torque of the grease gradually decrease. This phenomenon occurs due to changes in the microstructure of lithium grease. The shear degradation of lithium grease was mainly divided into two stages: the rapid stage was the destruction of the thickener network structure and the fibers being shortened by shearing. The slow stage was the process in which short fibers were sheared into shorter fibers.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xinyu Zhai,Chunchen Ruan,Lei Chen,Xiaotian Peng,Shuai Yin,Hao Peng
The binary alkane system (C 6 -C 7 , C 6 -C 8 ) was comprehensively explored in this study, and the best cryogenic eutectic n-alkane (70 %C 6 -30 %C 7 ) with freezing point of −115.8℃ and phase transition enthalpy of 123 J/g was designed. After comparing various non-ionic emulsifiers (Span 80, Tween 80, PVA 1788, Arabic gum, Xanthan gum) through volatilization test, Span 80 was selected as the best anti-volatilization emulsifier to synthesize MEPCMs. Different anionic and nonionic emulsifier ratios were studied and determined to be 9:1. Cryogenic MEPCMs were prepared by in-situ polymerization, and the energy storage, thermodynamic, anti-volatilization properties, anti-leakage, mechanical property and durability were characterized. The results show that the morphology of MEPCMs is complete, the core wall materials are well bonded, and the coating rate is 50.9 %. PEG was used as a cross-linking agent to modify the shell of MEPCMs. The characterization results show that PEG effectively improvs the flexibility of the wall material, and the enthalpy loss of the MEPCMs in the anti-leakage test is reduced from 66.4 J/g to 15.8 J/g. The preferred anti-volatilization emulsifier increases the durability of MEPCMs from 192 h to 240 h. After 60 phase transition cycles, the enthalpy value of the MEPCMs is almost unchanged. This study bridges the volatility defects of cryogenic phase change materials and strengthens the durability of MEPCMs in terms of both core-wall and wall materials, which provides an important basis for the utilization of cold energy in cryogenic systems such as LNG, liquid hydrogen, and liquid air.
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CHEMICAL PHYSICS LETTERS
·
2024
·
IF 2.8
Yutong Liu,Yong Qiu,Qi Zhu,Tao Tian
Adsorption technology utilizing zeolites as adsorbents is a highly efficient and cost-effective method for controlling the emission of volatile organic compounds (VOCs). Herein, two hierarchical diatomite/FAU-type zeolite composites were synthesized by a seeding-assisted secondary hydrothermal growth method and high-temperature hydrothermal dealumination, respectively. The adsorption properties of the composites for VOCs, such as toluene, ethyl acetate, n-heptane, methanol and acetone, were systematically evaluated. The pseudo-second-order model provided a perfect fit to adsorption kinetics, while the Langmuir model agreed the best with the adsorption isotherms. Furthermore, Dt/USY has remarkable recycling stability even after five regeneration cycles, resulting in outstanding VOCs adsorption efficacy.
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Journal of Marine Science and Engineering
·
2025
·Vol. 13
·期 9
·1713
·
IF 2.8
Aigang Li,Shengjun Guo,Jianwen Deng,Hong Chen,Jinxuan Wu,Ru Jiang,Jing Tan,Lihua Cheng,Libo Zhang,Qinzhen Fan
Addressing IMO 2020 compliance, this study investigates marine fuel oil production from hydrotreated residues, focusing on mitigating excessive total sediment potential (TSP) caused by over-hydrotreatment. This study systematically investigates the impact of blending ratios of Fluid Catalytic Cracking (FCC) slurry oil with Residue Desulfurization (RDS) heavy oil on TSP, colloidal stability, and asphaltene structure evolution. Techniques such as XRD, SEM, and XPS were employed to analyze the structural changes in asphaltenes during the TSP exceeding process. The results indicate that as the FCC slurry oil blending ratio increases, TSP in the blended oil initially rises and then decreases. The peak TSP value of 0.41% occurs at a 10% FCC slurry oil blending ratio, primarily due to high-saturation hydrocarbons in RDS heavy oil disrupting the colloidal stability of asphaltenes in FCC slurry oil. When the blending ratio reaches 25%, TSP significantly decreases to 0.09%, attributed to the solubilizing effect of high aromatic compounds in the FCC slurry oil on the asphaltenes. The ω(Asp)/ω(Res) ratio mirrors the TSP trend, and the colloidal solubilizing capacity of asphaltenes increases with the blending ratio. Asphaltenes in RDS heavy oil exhibit a spherical structure, whereas those in FCC slurry oil show a layered structure. The precipitated asphaltenes in the blends primarily result from the aggregation of asphaltenes in FCC slurry oil, with heteroatoms (N, S, O) mainly originating from RDS heavy oil asphaltenes. During the early stage of blending, TSP formation is dominated by FCC slurry oil asphaltenes, but increasing the aromatic content in the system can significantly reduce TSP. This work provides theoretical and technical support for optimizing marine fuel blending processes in petrochemical enterprises.
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Matter
·
2025
·
IF 17.5
Lizhong Dong,Xiaojie Yuan,Ming Ren,Yimin Hu,Xiaobo Wang,Guang Yang,Yuxin Li,Jiadong Li,Jiangtao Di,Qingwen Li
Natural muscles feature resilient actuation, but currently developed artificial muscle fibers do not. The main challenge is serious plastic elongation, especially when artificial muscle fibers are operated at heavy loads, significantly limiting their applications. We report a resilient artificial muscle fiber that deploys an elastic sheath. The sheath enables full lengthwise recovery of the coiled artificial muscle fiber straightened at 375% strain. This muscle fiber produces natural muscle-like resilient actuation, which features elastic elongation when bearing heavy loads and consistent contractions at load-balanced muscle lengths. Two muscle fibers connected in an antagonistic structure, amounting to ∼8% of the weight of an electrical rudder system, efficiently control the flight attitude of a commercial ornithopter. An adaptive pressure band based on these muscle fibers provides rhythmic pressure to prevent venous diseases. Such resilient muscle fibers can offer important potential in robotics and wearable technologies that require high durability and adaptability.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Qianchun Zhang,Jiumei He,Chengcheng Wan,Xixi Long,Zhaoru Ban,Shan Tang,Yanju Chen
Isobutyraldehyde is a harmful gas that poses a threat to both environment and human health. Therefore, it is essential to develop a highly selective, sensitive, and efficient sensor that can rapidly detect isobutyraldehyde traces. In this study, a cataluminescence gas sensor for isobutyraldehyde detection is developed utilizing porous aluminum nitrite. This sensor has a rapid response time and exhibits notable selectivity, stability, and sensitivity to isobutyraldehyde. The sensor operated effectively over a broad linear range of 0.776–310 ppm and achieved a detection limit of 0.155 ppm with a signal-to-noise ratio of 3. When applied to isobutyraldehyde detection in real samples, the developed sensor achieved recoveries in the range of 79.0–96.8 % with relative standard deviations (RSDs) of 4.6–8.7 %. The sensing mechanism was validated through density functional theory and gas chromatography–mass spectrometry. The sensor demonstrated excellent sensing properties, including enhanced sensitivity, selectivity, and stability, indicating considerable potential for trace isobutyraldehyde detection. Furthermore, it shows promise as an effective candidate for detecting other gaseous contaminants.
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ENERGY & FUELS
·
2025
·
IF 5.3
Haoyu Liu,Wei Liu,Yanlin Wang,Hong Yuan
The incorporation of mesopores into zeolite catalysts improves both reactant diffusion and the catalyst lifespan. In this study, a bolaform surfactant, C6H13–N+(CH3)2–C6H12–N+(CH3)2–C6H12–O–C6H4–O–C6H12–N+(CH3)2–C6H12–N+(CH3)2–C6H13 (BAM–6–6–6), was used to guide the synthesis of hierarchical MFI zeolite nanosheets (HMNs). The HMN pore structure and acidic sites were altered by varying the ratio of the K2SO4-derived K+ and Al sources in the initial gel. The X-ray diffraction, Fourier transform infrared spectroscopy, scanning electronic microscopy, and N2 adsorption/desorption were used to characterize these materials. The HMNs each had an interconnected hierarchical pore structure which consisted of MFI and mesoporous structures and mesopore-specific surface areas as high as 353.8 m2 g–1, indicating that the BAM–6–6–6 formed lamellar micelles based on π–π stacking. Temperature-programmed NH3 desorption and 27Al magic angle spinning nuclear magnetic resonance spectroscopy revealed that the intersection cavity of the HMN structure was enriched with acidic sites. Because of the layered HMN structure, which promoted diffusion and increased resistance to carbon deposition and buildup, the catalysts possessed good catalytic activity in cracking oleic acid. For the HMN zeolite, the light-olefin yield reached 50.02% at 500 °C, outweighing that of conventional ZSM-5 (39.80%), and the initial catalytic activity was retained for up to 50 h. Furthermore, for HMN, the hard coke loss (3.8%) was less than that for CZSM-5 (9.7%).
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NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 47
·20061-20070
·
IF 2.7
Jiabing Chen,Yibo Tang,Xiaojun Lu,Zijing Lu,Xingmao Jiang
The industrial production of methyl propionate synthesized via methoxycarbonyl esterification of ethylene achieved 100% atom economy. In this study, we synthesized ruthenium-loaded praseodymium–cerium oxide (Pr–CeO2) catalysts by precipitation impregnation and evaluated their performance in the methoxycarbonylation reaction of ethylene. The effect of Pr doping on the reaction results was analyzed by characterization and mechanistic studies. Pr doping increased the concentration of localized oxygen vacancies in the catalysts and thus modulated the catalytic effect of Lewis acid–base pairs. The increase of local oxygen vacancies significantly enhanced the activation and dissociation of CH3OH. At the same time, since the dissociation activation of the other two feedstock molecules, ethylene and CO, occurred at the Ru site, Pr doping facilitated the dispersion of Ru to a certain extent, thus increasing the dissociation activation of CO and ethylene, which, in combination with Pr doping, further increased the content of oxygen vacancies in the active site as methanol, resulting in a substantial enhancement of the dissociation activation of the feedstock molecules, which then increased the catalytic reaction rate through synergistic effects. The results provide a new perspective for the future study of methoxycarbonylation.
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MOLECULES
·
2024
·Vol. 29
·期 13
·3185
·
IF 4.2
Li Lin,Si Xiao,Chuxuan Wang,Manhong Huang,Ling Xu,Yi Huang
The development of superlyophobic materials in liquid systems, enabling synchronous oil/water separation and dye removal from water, is highly desirable. In this study, we employed a novel superwetting array-like BiOBr nanosheets anchored on waste rock wool (RW) fibers through a simple neutralization alcoholysis method. The resulting BiOBr/RW fibers exhibited superoleophilic and superhydrophilic properties in air but demonstrated underwater superoleophobic and underoil superhydrophobic characteristics. Utilizing its dual superlyophobicity, the fiber layer demonstrated high separation efficiencies and flux velocity for oil/water mixtures by prewetting under a gravity-driven mechanism. Additionally, the novel BiOBr/RW fibers also exhibited excellent dual superlyophobicity and effective separation for immiscible oil/oil systems. Furthermore, the BiOBr/RW fibers could serve as a filter to continuously separate oil/water mixtures with high flux velocity and removal rates (>93.9%) for water-soluble dye rhodamine B (RhB) simultaneously by directly activating peroxymonosulfate (PMS) in cyclic experiments. More importantly, the mechanism of simultaneous oil/water separation and RhB degradation was proposed based on the reactive oxygen species (ROS) quenching experiments and electron paramagnetic resonance (EPR) analysis. Considering the simple modified process and the waste RW as raw material, this work may open up innovative, economical, and environmentally friendly avenues for the effective treatment of wastewater contaminated with oil and water-soluble pollutants.
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Nature Sustainability
·
2024
·
IF 25.7
Gao Zhiwen,Wang Yu,Yuan Lei,Shi Xinrui,Shang Yihao,Jiang Jingang,Zhang Min,Fang Shuhui,Zhang Wei,Liu Yue
Co-upcycling of mixed plastics offers a viable approach to reusing carbon resources in plastic wastes and realizing circular economy. However, the presence of polyvinyl chloride (PVC) often complicates the co-upcycling processes, because chlorine (Cl) released from PVC can deactivate catalysts and enter final products. Moreover, existing plastic upcycling processes usually require harsh reaction conditions. Here we present a strategy enabling efficient co-upcycling of PVC and polypropylene (PP) at mild conditions. We use chlorine-resistant ionic liquids butylpyridinium chloride-aluminium chloride to dechlorinate PVC and simultaneously depolymerize the PP–PVC mixture into Cl-free liquid hydrocarbons, with the co-production of hydrogen chloride (HCl) as byproduct. This conversion approach operates at room temperature without the use of external hydrogen or noble metal catalysts. The Cl-free liquid hydrocarbon yield is up to 97.4 wt% of C and H in the feed PP–PVC mixture. This work can incentivize further technical development in plastic upcycling and improve the sustainability of plastic waste management.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-12
·
IF 14.7
Ma Xinlong,Yin Haibin,Pu Zhengtian,Zhang Xinyan,Hu Sunpei,Zhou Tao,Gao Weizhe,Luo Laihao,Li Hongliang,Zeng Jie
Acetone serves as an important solvent and building block for the chemical industry, but the current industrial synthesis of acetone is generally accompanied by the energy-intensive and costly cumene process used for phenol production. Here we propose a sustainable route for acetone synthesis via propane wet reforming at a moderate temperature of 350 o C with the use of platinum-tin nanoparticles supported on γ-aluminium oxide (PtSn/γ-Al 2 O 3 ) as catalyst. We achieve an acetone productivity of 858.4 μmol/g with a selectivity of 57.8% among all carbon-based products and 99.3% among all liquid products. Detailed spectroscopic and controlled experiments reveal that the acetone is formed through a tandem catalytic process involving propene and isopropanol as intermediates. We also demonstrate facile ketone synthesis via wet reforming with the use of different alkanes ( e.g ., n-butane, n-pentane, n-hexane, n-heptane, and n-octane) as substrates, proving the wide applicability of this strategy.
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CANCER LETTERS
·
2024
·
IF 9.1
Chunyu Liu,Jiawei Chen,Yukun Cong,Kang Chen,Haoran Li,Qingliu He,Liang Chen,Yarong Song,Yifei Xing
With the widespread use of anti-androgen therapy, such as abiraterone and enzalutamide, the incidence of neuroendocrine prostate cancer (NEPC) is increasing. NEPC is a lethal form of prostate cancer (PCa), with a median overall survival of less than one year after diagnosis. In addition to the common bone metastases seen in PCa, NEPC exhibits characteristics of visceral metastases, notably liver metastasis, which serves as an indicator of a poor prognosis clinically. Key factors driving the neuroendocrine plasticity of PCa have been identified, yet the underlying mechanism behind liver metastasis remains unclear. In this study, we identified PROX1 as a driver of neuroendocrine plasticity in PCa, responsible for promoting liver metastases. Mechanistically, anti-androgen therapy alleviates transcriptional inhibition of PROX1. Subsequently, elevated PROX1 levels drive both neuroendocrine plasticity and liver-specific transcriptional reprogramming, promoting liver metastases. Moreover, liver metastases in PCa induced by PROX1 depend on reprogrammed lipid metabolism, a disruption that effectively reduces the formation of liver metastases.
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