CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Yueyang Wu,Yuling Lyu,Hai Yang,Kunlin Song,Zhuren Wu,Zirui Zhang
Appropriate electrical parameters are crucial for efficient dehydration. At the resonance frequency, the weakened interfacial film is prone to rupture, promoting droplet aggregation and enhancing dehydration efficiency. However, the theoretical mechanism of droplet resonance remains unclear. To elucidate the dynamic response mechanism of droplets in oil under an AC electric field, this paper analyzes the force on droplets under the electric field, deduces the frequency conditions for displacement resonance and velocity resonance, and explores the effects of droplet particle size, oil viscosity, interfacial tension, and electric field strength on the resonance frequency under the vertical electrodes. Results reveal a critical frequency that maximizes droplet deformation. Droplets experience electric, drag, and internal forces, and the resonance frequency is determined by the difference between the intrinsic frequency ( ω 0 ) and oil damping. The resonance frequency decreases by about 0.99 times when the droplet radius increases by 1.6 times. The maximum deformation reaches 0.14 at an interfacial tension of 4.9 mN·m −1 . At resonance, the droplet deformation stabilizes at a high value of 0.0498 when the viscosity is 100 mPa·s, whereas viscosities above a critical value induce delayed deformation and lower stabilized values. Higher voltages accelerate deformation. These findings provide a theoretical basis for optimizing electrical parameters and improving dehydration efficiency in water-in-oil emulsions.
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ENERGY & FUELS
·
2026
·
IF 6
Yuqing You,Jie Zhou,Dongsheng Wu,Xiaoguang Wang
Geological carbon sequestration in depleted oil reservoirs represents a promising climate mitigation strategy, although its efficiency is complicated by CaCO3 precipitation and the presence of residual oil. This study combines microfluidic experiments, numerical simulations, and theoretical analysis to investigate how dynamic oil–brine interfaces regulate precipitation under varying Pe/Da/SI conditions in confined pores. With 50 mPa·s residual oil, it was observed that (1) enhanced local shear at the interface reduces supersaturation, with interfacial tension less influential than velocity and supersaturation for ACC nucleation; (2) local shear and supersaturation control precipitation rates, while frictional resistance governs nuclei attachment and growth; (3) reduced mass-transfer resistance, enhanced ion flux, and lowered water diffusivity (supported by residence time analysis) promote crystal growth; and (4) local shear and advection induce growth anisotropy, while oil viscosity and dielectric properties stabilize metastable phases (e.g., vein-like ACC and cauliflower-like aragonite). Results across different pore sizes revealed formation-specific impacts: in sandstone pores, light oil accelerated precipitation and clogging risk, while in carbonate vugs, it promoted polymorph dispersion, alleviating localized clogging. These pore-scale insights into oil–brine interfacial dynamics extend beyond carbon storage, providing critical guidance for predicting CaCO3 behavior in geothermal exploitation and NAPL-contaminated site remediation, where similar multiphase interfaces govern precipitation outcomes.
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ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Jianning Yu,Enfeng Yang,Haitao Deng,Guoliang Liu,Wenxuan Zhao,Xiangdong Yang,Xiugong He,Dezhao Hao,Ye Tian,Lei Jiang
The growth in oil demand has driven technological innovation in enhanced oil recovery (EOR). Chemical flooding, widely adopted for its effectiveness in improving oil recovery, enhances the macroscopic sweep efficiency by altering interfacial properties. However, strong oil–solid adhesion leads to residual oil, posing a key technical challenge. Although low-salinity water flooding can disrupt the hydrated ion bridge structure, its efficacy is limited, and it fails to fully resolve residual oil issues. To tackle this residual oil challenge, we developed traditional Chinese medicine (TCM) composite agents based on polyphenol–silicon complexation with dual EOR functions: in situ oil displacement and long-term oil isolation. Under weak alkaline conditions, the TCM composite agent continuously reacts with silicon, overcoming van der Waals forces between crude oil and silicate, thereby effectively displacing oil in micron-scale grooves. The polyphenol–silicon complexes, along with polyphenol, form a hydrophilic coating with micro/nanostructures via π–π interactions, maintaining superoleophobic and nonadhesive properties against crude oil even after 1 week. Additionally, the TCM agents altered the wettability of shale from oil-wet to water-wet and achieved an 88.24% recovery rate in core flooding tests. This breakthrough offers a solution for crude oil recovery, promoting efficient and environmentally sustainable development in the industry.
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Magnetochemistry
·
2026
·Vol. 12
·期 4
·39
·
IF 2.8
Mao Liao,Zhenggui Li,Zhaoqiang Yan,Chuanjun Han,Wei Tai,Xin Chen,Yu Zheng
This study focuses on the reliability issue of magnetic fluid (MF) in the magnetic fluid sealing technology for the upper guide bearing (UGB) of hydro-generators and proposes selection schemes for MF suitable for different models of hydro-generators. By analyzing the performance indicators of five base fluids and MFs, including the acid value, flash point, oxidation stability, magnetorheological performance, breakdown voltage, dielectric loss factor and volume resistivity, the influencing factors of the insulating performance of MFs and their mechanism in sealing the UGBs of hydro-generators are investigated. The results show that, when the spindle speed is below 27 rpm, the viscosity of the MF is dominated by the magnetic field strength, while, when the speed exceeds 27 rpm, the viscosity of the MF is dominated by the shear rate. In addition, the addition of magnetic nanoparticles (MNPs) causes the breakdown voltage of the base carrier liquid to fluctuate in the range of 31.2–55.9 kV, the dielectric loss factor to fluctuate in the range of 2.5 × 10−4–6.7 × 10−3, and the volume resistivity to fluctuate in the range of 2.8 × 1011–2.6 × 1012Ω·m. The research results provide a theoretical basis for the application of high-efficiency and stable magnetic fluid sealing technology.
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ACS Applied Polymer Materials
·
2025
·
IF 4.7
Tianxiang Du,Zenghui Zhao,Chang Xu,Shiqiang Guan,Yinhao Diao,Jianzhao Li,Xufeng Dong,Ning Ma
With the increasing demand for vibration isolation in advanced manufacturing, precision instruments must not exhibit significant vibrations under broadband excitation, necessitating real-time stiffness adjustment in vibration isolation systems to effectively isolate external low and high-frequency vibrations. Magnetorheological elastomer (MRE) semiactive vibration isolators can adapt well to broadband environments, but current bidirectional modulus regulation methods are either overly complex or ineffective. Modifying the internal MRE is the most direct and effective approach. Achieving pronounced bidirectional modulus regulation while maintaining mechanical properties and MR effects in MREs is a current research challenge. This study creatively used a stratified curing method to fabricate an anisotropic laminated MRE (L-MRE) with hard magnetic MRE (H-MRE) on both ends and conventional MRE in the middle layer. The SEM, EDS, XRM, and optical imaging confirmed the successful fabrication of L-MRE. Theoretical analysis and testing validated that L-MRE seamlessly integrates the magnetic and mechanical advantages of H-MRE and MRE, showcasing great advantages of the complementary effect of composite materials. Most importantly, compared to traditional MRE materials, the lamination effect endows L-MRE with satisfactory bidirectional modulus regulation. This research provides an innovative material with reference value for the application demands of broadband vibration reduction technology.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Xiaolei Zhang,Tingshuo Kang,Jianchen Sun,Jianxin Liu,Gulizhaina Habudula,Guogang Sun
The gas-liquid transport efficiency of porous transport layers (PTLs) in proton exchange membrane electrolyzers (PEMECs) critically influences overall electrolysis performance. Wettability optimization enhances gas-liquid dynamics, and templated modification techniques are used to regulate hydrophilic/hydrophobic properties of PTL, improving gas-liquid distribution and transport pathways. This study investigates the influences of modifier composition and template patterns on the gas-liquid transport behavior electrolytic efficiency of PEMECs. Results showed that compared to polydimethylsiloxane (PDMS)-based systems, a methyltrimethylsilane (MTMS)/hexadecyltrimethoxysilane (HDTMS) composite formed superhydrophobic coating (contact angle θ = 150.3°) on titanium substrates, demonstrating superior interfacial stability and anti-wetting properties. Furthermore, by changing the wettability modification strategy, the effects of hydrophilic region proportions (10 %, 20 %, 30 %) and geometries on electrochemical performance were evaluated. It was shown that the 10 % hydrophobic sample achieved optimal results, with a minimum electrochemical resistance ( R ohm ) of 0.20497 Ω cm 2 at 1.7 V and 0.5 A/cm 2 . Additional experiments on hydrophobic region geometry revealed that circular designs enhance gas-liquid mass transfer by accelerating bubble detachment. These findings advance PTL optimization strategies and offer practical insights for improving PEMEC efficiency and scalability.
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JOURNAL OF MOLECULAR LIQUIDS
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2025
·
IF 5.2
Chaoke Huang,Feng Jiao,Yongqing He,Jianzhi Yang
Liquid marbles—droplets encapsulated by particles—offer unique non-wetting properties for applications in microfluidics and surface engineering. Liquid marbles gliding over a wetted surface exhibit significant contact angle hysteresis, which reduces frictional resistance and enhances their sliding ability. However, their dynamic behavior on wetted surfaces remains underexplored. Consequently, designing surfaces to prevent particle contamination requires clear design principles and the use of additional droplets to cleanse the surface and maintain its cleanliness. This study focuses on wettability, elastic behavior, dynamic behavior of liquids, and their interaction with surface characteristics. The experimental results categorize the movement process of liquid marble on a wetted surface into three stages based on the movement state: the shedding stage, the deformation stage, and the sliding stage. During the process, the contact friction force F f2 generated between the liquid marble and the lubricating surface is proportional to the change in the contact angle Δθ of the liquid marble ( F f2 ~ Δθ ). The viscous force dominates the forces affecting the marble's movement during the peeling and deformation stages. The deformation will exhibit compression and rebound phenomena for liquid marbles with a volume of V > 30 μL. Surface tension governs the movement of liquid marbles during the sliding stage. The air film on the marble's surfaces reduces the contact area with the solid surface, resulting in a more pronounced non-wetting effect. Incorporating hydrophobic particles within a droplet enhances its surface tension, and the capillary action between the particles and the droplet enables adhesion to the surface. This prolongs deformation and improves stability during the movement process.
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Surfaces and Interfaces
·
2025
·
IF 6.3
Shang Li,Meiling Xin,Xuan Su,Chaogang Ding,Xiufang Liu,Donghe Zhang,Zhongyuan He,Zhenyu Li,Jie Xu,Bin Guo
Bionic lubricant-infused surface (LIS), as a novel type of bi-phase material function surface, has garnered widespread attention due to their unique lubrication properties. Inspired by the multi-factors coupling relationship of Nepenthes liquid surface, we begin with microstructures design. The femtosecond laser (the cutting-edge laser technology) is utilized to create precisely micropores on PDMS surface. The process-to-structure design and modulation on micropores distance are accomplished by carefully controlling two key parameters, namely laser scanning speed and scanning pitch. Slippery LISs are constructed by impregnating micropores surfaces with lubricant. Notably, microstructural design and process modulation produce two distinct types of microporous substrates (separated and connected micropores), ultimately yielding two kinds of LISs. For the first time, these two LISs were comprehensively compared through surface wettability, droplet impact, lubricant infusing and drag reduction experiments. In particular, the microfluid technology is firstly utilized to screen microstructures for evaluating the lubricant infusing behaviors. Comprehensive comparison analysis reveals that the connected micropores are more suitable for the preparation and application of drag-reduction LIS. In addition, this study significantly expands the applicability of femtosecond laser surface processing, while establishing a robust theory framework and offering a comprehensive reference for the LISs tailored for drag reduction applications.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Hua Ma,Xueyang Liu,Jingxian Wang,Yuhan Cai,Jiaoyang Huang,Mengting She,Liping Chen,Hanwen Zhang,Hua Wang,Siwei Xiong
Polymer fiber-based insulating paper is widely utilized in electrical equipment for insulation and protection. However, with the miniaturization of electrical systems, conventional insulating paper struggles to balance space constraints and performance, limiting its application in high-performance devices. This study introduces polyarylate (PAR) nanofibers, fabricated via melt spinning and mechanical disintegration, followed by scalable hot pressing to produce ultra-thin PAR nanofiber membranes with a thickness of 30 μm, which is 40 % thinner than commercial aramid paper. The high orientation and dense inter-fiber network of PAR nanofibers effectively mitigate electric field distortion, resulting in a breakdown field strength of 71.46 kV/mm, which is 251.5 % higher than commercial aramid paper. Notably, the PAR nanofiber membranes exhibit exceptional structural stability under multi-physical environmental conditions. After prolonged thermal aging (250 °C for 24 h), UV exposure (365 nm for 48 h), repeated folding, and multiple kneading cycles, they retained breakdown strengths of 17.73 kV/mm, 25.19 kV/mm, 15.86 kV/mm, and 13.8 kV/mm, respectively. In contrast, commercial Aramid paper exhibited a marked decline, with breakdown strength decreasing to 11.32 kV/mm, 14.8 kV/mm, 7.75 kV/mm, and 9.97 kV/mm under the same conditions. Moreover, the thermoplastic nature of PAR nanofiber membranes enables closed-loop recycling, reducing material waste while preserving performance and presenting a sustainable and scalable approach for next-generation high-performance insulating materials.
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PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Jiahao Wang,Zepeng Wang,Enfu Wang,Zijian Deng,Tao Lin,Wenbiao Zhang,Luming Li
Oil leakage has always been of great concern to researchers. However, developing materials with high oil selectivity and simple recovery capabilities still requires breakthroughs. Here, a novel lignin-based superhydrophobic magnetic polyurethane (PU) sponge was prepared through simple soaking a superhydrophobic magnetic coating using phosphorylated alkaline lignin (PL) as a template for in-situ formation of iron oxides, PDMS and MTMS as hydrophobic modifiers, PDMS as a binder, and PU sponges with excellent mechanical properties as the representative porous material. In the system, PL is prepared by grafting phosphate groups on the surface of alkaline lignin (AL). After adding the phosphate group, PL will be uniformly dispersed in the system and can adsorb Fe 2+ and Fe 3+ to generate Fe 3 O 4 particles that is uniformly dispersed and does not affect the pore structure. PL and Fe 3 O 4 together as rough structures, under the synergistic effect of silane long chain formed by the hydrolysis of PDMS and MTMS achieve superhydrophobic properties, so as to provide a high oil selectivity of the system. Moreover, the uniformly dispersed Fe 3 O 4 enables the porous material to obtain magnetic properties that are easily recovered by magnets after oil-water separation. The prepared modified PL@Fe 3 O 4 composite sponge shows excellent superhydrophobic (water contact angle of 152.2°), oil absorption (7.95–20.48 g/g for various oils or organics) and magnetic properties (2.87 emu/g). This strategy opens up new possibilities for improving the utilization rate of lignin and porous materials.
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Advanced Science
·
2025
·
IF 14.1
Xinyu Fan,Jingtong Li,Deyu Yang,Jie Fei,Hejun Li,Xianghui Hou
Icephobic surfaces offer a passive protection strategy against icing hazards in industrial applications. However, the improvement of surface icephobicity is normally accompanied by a compromise in mechanical properties and restrains the practical application of current icephobic surfaces/materials. Here, a generic strategy for icephobic material design is reported to address this conflict through interfacial elastic instability prompted by the synergistic integration of fibrous construction (FC) frameworks with icephobic polymers. The FC-based material structures could induce periodically localised/amplified stress at the ice/solid interface, leading to interfacial elastic instability and facilitating effective ice detachment. Low ice adhesion strength is achieved, while the tensile strength of the materials is enhanced by 19 times more than the polymer matrix due to the reinforcement from the FC frameworks. Based on the serrated features of the shear forces and numerically simulated interfacial stress distribution, a new theoretical model is established to interpret the nature of interfacial elastic instability and undulatory interfacial stress. This work provides fundamental insights for designing high-performance icephobic materials that transcend traditional performance trade-offs, advancing both surface science and materials for practical ice mitigation.
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Science China-Materials
·
2025
·
IF 7.4
Feng Rui,Song Fei,Liu Xue,Liu Yi-Peng,Zhang Yi-Ting,Wang Fang,Wang Xiu-Li,Wang Yu-Zhong
Natural surfaces with heterogeneous wettability inspire innovations in functional materials. Lubricant-infused slipperiness and heterogeneous three-dimensional (3D) micro-textures are emerging performers, displaying diversified interface features and spatial topologies. However, how to construct well-defined heterogeneous wettability on 3D micro-textures to create stable heterogeneous slippery surfaces remains challenging. Here, a 3D micro-heterogeneous wetting surface, featuring a lubricant sea dotted with superhydrophilic micro-islands, was fabricated via an innovative method without costly techniques. Tunable micro-island dimensions are supported for stable lubricant retention and programmable slipperiness. The flexibility and vertical heterogeneity enable the film advanced functions of deformation-responsive convertible adhesion and high-performance water collection. This work can greatly boost interfacial materials and extend their application in intelligent microfluidics and sustainable systems.
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