Smart Materials and Structures
·
2017
·Vol. 26
·期 9
·095024
·
IF 2.909
Guanglei Du,Xuegong Huang,Yancheng Li,Qing Ouyang,Jiong Wang
This paper reports an investigation on a semi-active/passive integrated vibration isolator utilizing a magnetorheological elastomer (MRE) and spring. To overcome the main shortcoming of passive isolation systems, i.e. lack of adaptability, the semi-active/passive integrated isolator (SAPII) based on an MRE and spring is designed and prototyped. The magnetic circuit is optimized by finite element analysis to fully unlock the unique features of the MRE. The dynamic response characteristic of the SAPII is experimentally investigated under a sweep frequency test. A dynamic model of the SAPII vibration isolation system is established on the basis of the Kelvin model. The model parameters, such as equivalent stiffness and equivalent damping, are identified from experimental data. An ON-OFF control law based on the minimal displacement transmissibility is designed for isolation control of the sinusoid excitation. Two control laws, i.e. ON-OFF control and fuzzy logic control, are designed for vibration isolation of random excitation. Finally, the effectiveness of these control laws is verified by numerical simulation and experiment.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Fengqin Li,Yuxue Hu,Xiaoming feng,Guizhong Tian
To mitigate the attachment of fouling organisms , Slippery Liquid-Infused Porous Surfaces (SLIPS) hold tremendous potential as a green and broad-spectrum antifouling solution, capable of replacing traditional antifouling coatings. However, the complexity of current preparation methods and the limited lifespan of lubricating oils constrain their widespread application in marine antifouling for vessels. In this study, melamine sponge (MS) was used as a substrate, and modifications were made by introducing superhydrophobic silica nanoparticles (SiO 2 NPs), a biocompatible adhesive (ethyl cyanoacrylate, ECA), and a highly stretchable polymer (poly-ε-caprolactone, PCL). By combining natural surface microstructures with additional nanomaterials , we successfully obtained a superoleophilic surface, effectively capturing liquid lubricants and maintaining their long-term stability. The sponge substrate possesses distinctive contractility, with the lubricant stored in the grid spontaneously compensating for the loss of surface lubricant, thereby effectively enhancing its durability. This study provides a straightforward fabrication method with reduced manufacturing costs for environmentally friendly marine anti-fouling coatings. The approach demonstrates a prolonged cyclic anti-fouling effect, effectively advancing the development of SLIPS for anti-fouling applications in shallow marine environments.
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高影响因子
Silicon
·
2025
·
IF 3.3
Liu Yuanfei,Fu Jie,Liu Yuan,Gao Zhengxia,Ma Chengliang
With the development of third-generation semiconductors, the heat dissipation problems of electronic packaging systems and the harsh usage environment of high-power devices have put forward higher requirements on the thermal conductivity and mechanical properties of silicon nitride ceramic substrates. As an almost defect-free ceramic forming technology, aqueous gel tape casting technology is very suitable for the forming of ceramic substrate materials because of the high density, low porosity and large forming size of the ceramic flakes produced. However, the existing acrylamide-methylene bisacrylamide (AM-MBAM) gel system has a complicated process, is subject to oxygen depolymerisation and has problems such as neurotoxicity. For this reason, in this study, a non-toxic and environmentally friendly isobutylene-maleic anhydride copolymer (Isobam) gel system was used to prepare silicon nitride ceramic substrates in-situ by combining the methods of gel tape casting and reaction sintering. The rheological properties of the slurry were optimized by adjusting the dosage of additives, and the effects of the nitriding reaction process of silicon powder and different sintering aids on the properties of Si3N4 ceramic substrates after resintering were investigated in detail. The results show that the slurries with different additive contents show shear-thinning behaviour and relatively high solid content. Under 0.1 MPa nitrogen atmosphere, Si 3 N 4 has been basically completely generated at 1400 °C, and the comprehensive performance of Si 3 N 4 ceramics is optimal with the addition of Y 2 O 3 -MgO-ZrO 2 sintering additives. The relative density and thermal conductivity were 98.4% and 61.5 W·m −1 ·K −1 , respectively, and Si 3 N 4 showed columnar morphology, which effectively improved the hardness, fracture toughness and flexural strength of Si 3 N 4 ceramics, up to 13.39 GPa, 6.9 MPa·m 1/2 and 684.5 MPa, respectively.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Peihua Zhang,Runpeng Jiang,Boyuan Li,Aoxun Liang,Xueye Chen,Xiaoxiao Chu
Superhydrophobic surfaces have broad application prospects in droplet transport, sensors, microfluidics and other fields. However, most of the superhydrophobic surfaces are manufactured on rigid substrates or flexible substrates with low deformation. When deformation occurs, the superhydrophobic properties are difficult to be guaranteed, which hinders the practical application of superhydrophobic surfaces. Using a mixture of prepolymer A, crosslinking agent B and dimethylsilicone oil as raw materials, PDMS/dimethylsilicone oil superhydrophobic high tensile film (Pdoshtf) is prepared by simple template and low surface energy treatment. The prepared Pdoshtf shows excellent tensile property and superhydrophobic stability, the tensile ratio at break is 300 %, and the excellent superhydrophobic property can be maintained after 250 % stretching. In addition, droplet falling on the Pdoshtf bounces back in time without any residue, showing excellent superhydrophobic properties. Finally, an energy harvesting device composed of Pdoshtf and electromagnetic system is designed and prepared, which can collect the energy of raindrops through droplet drop and rebound.
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高影响因子
Micromachines
·
2024
·Vol. 15
·期 11
·1355
·
IF 3
Wentao Li,Jianxin Zhou,Wei Sheng,Yuxi Jia,Wenjie Xu,Tao Zhang
A flexible pressure sensor, capable of effectively detecting forces exerted on soft or deformable surfaces, has demonstrated broad application in diverse fields, including human motion tracking, health monitoring, electronic skin, and artificial intelligence systems. However, the design of convenient sensors with high sensitivity and excellent stability is still a great challenge. Herein, we present a multi-scale 3D graphene pressure sensor composed of two types of 3D graphene foam. The sensor exhibits a high sensitivity of 0.42 kPa−1within the low-pressure range of 0–390 Pa and 0.012 kPa−1within the higher-pressure range of 0.4 to 42 kPa, a rapid response time of 62 ms, and exceptional repeatability and stability exceeding 10,000 cycles. These characteristics empower the sensor to realize the sensation of a drop of water, the speed of airflow, and human movements.
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PubMed
高影响因子
SENSORS
·
2024
·Vol. 24
·期 5
·1640
·
IF 3.4
Zhangling Li,Tong Guan,Wuxu Zhang,Jinyun Liu,Ziyin Xiang,Zhiyi Gao,Jing He,Jun Ding,Baoru Bian,Xiaohui Yi,Yuanzhao Wu,Yiwei Liu,Jie Shang,Runwei Li
Elastic pressure sensors play a crucial role in the digital economy, such as in health care systems and human–machine interfacing. However, the low sensitivity of these sensors restricts their further development and wider application prospects. This issue can be resolved by introducing microstructures in flexible pressure-sensitive materials as a common method to improve their sensitivity. However, complex processes limit such strategies. Herein, a cost-effective and simple process was developed for manufacturing surface microstructures of flexible pressure-sensitive films. The strategy involved the combination of MXene–single-walled carbon nanotubes (SWCNT) with mass-produced Polydimethylsiloxane (PDMS) microspheres to form advanced microstructures. Next, the conductive silica gel films with pitted microstructures were obtained through a 3D-printed mold as flexible electrodes, and assembled into flexible resistive pressure sensors. The sensor exhibited a sensitivity reaching 2.6 kPa−1with a short response time of 56 ms and a detection limit of 5.1 Pa. The sensor also displayed good cyclic stability and time stability, offering promising features for human health monitoring applications.
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Jiqun Li,Yan Zhang,Tianlu Yu,Shiyu Song,Xinyu Wei,Xiuling Qi,Jianlin Yang
Inorganic coatings with high transparency and superhydrophilicity have attracted tremendous attention because of their potential applications in marine environment monitoring, and oily wastewater treatment. However, the transparency and superhydrophilicity are usually mutually exclusive. Herein, we present a new facile strategy for fabricating highly transparent and mechanically robust superhydrophilic inorganic coatings with outstanding anti-fogging ability and anti-oil-fouling performance for high-viscosity oils. In this strategy, amorphous calcium phosphate (ACP) coatings are mineralized on the surface of polydopamine and polyethylenimine (PDA/PEI) membranes under the synergistic effect of magnesium ions, citric acid, and poly(acrylic acid) at room temperature, forming an organic-inorganic composite structure with a uniform texture on various substrates. Owing to the strong hydration capacity of ACP, these coatings are highly efficient at preventing surface fogging and avoiding underwater crude oil fouling. Meanwhile, the ACP coating without grain boundaries or pores can reduce light scattering, thus maintaining the high transparency of the substrate. Moreover, the organic-inorganic composite structure endows the coatings with robust mechanical properties. This PDA/PEI-ACP mineralized coating can be deposited on various substrates, showing potential applications in underwater optical lenses, oily wastewater treatment, microfluidic devices, and other areas.
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International Journal of Extreme Manufacturing
·
2024
·Vol. 7
·期 1
·015004
·
IF 16.1
Jialiang Zhang,Fangzheng Ren,Qing Yang,Qingyun Ma,Jie Liang,Yizhao Meng,Xiaodan Gou,Chongxiao Xia,Feng Chen
Transparent materials utilized as underwater optical windows are highly vulnerable to various forms of pollution or abrasion due to their intrinsic hydrophilic properties. This susceptibility is particularly pronounced in underwater environments where pollutants can impede the operation of these optical devices, significantly degrading or even compromising their optical properties. The glass catfish, known for its remarkable transparency in water, maintains surface cleanliness and clarity despite exposure to contaminants, impurities abrasion, and hydraulic pressure. Inspired by the glass catfish's natural attributes, this study introduces a new solution named subaquatic abrasion-resistant and anti-fouling window (SAAW). Utilizing femtosecond laser ablation and electrodeposition, the SAAW is engineered by embedding fine metal bone structures into a transparent substrate and anti-fouling sliding layer, akin to the sturdy bones among catfish's body. This approach significantly bolsters the window's abrasion resistance and anti-fouling performance while maintaining high light transmittance. The sliding layer on the SAAW's surface remarkably reduces the friction of various liquids, which is the reason that SAAW owns the great anti-fouling property. The SAAW demonstrates outstanding optical clarity even after enduring hundreds of sandpaper abrasions, attributing to the fine metal bone structures bearing all external forces and protecting the sliding layer of SAAW. Furthermore, it exhibits exceptional resistance to biological adhesion and underwater pressure. In a green algae environment, the window remains clean with minimal change in transmittance over one month. Moreover, it retains its wettability and anti-fouling properties when subjected to a depth of 30 m of underwater pressure for 30 d. Hence, the SAAW prepared by femtosecond laser ablation and electrodeposition presents a promising strategy for developing stable optical windows in liquid environments.
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高影响因子
PHYSICS OF FLUIDS
·
2024
·Vol. 36
·期 7
·
IF 4.1
Li Mofan,Yang Donghai,Chen Conglei,Lv Shiyi,Miao Jiaxu,He Limin
Unconventional crude oil and offshore oilfield extraction often lead to the formation of stable oil–water emulsions with high mineralization, posing significant threats to environmental protection and pipeline transportation safety. Electric–magnetic coupling separation technology represents a novel approach to emulsion breaking, offering superior separation performance compared to the conventional electric coalescence methods. However, its underlying mechanism remains elusive. To address this gap, this study comparatively investigates the liquid bridge dynamic during droplet coalescence under a single electric field and electric–magnetic coupling field conditions. High-speed camera experiments reveal that synchronized coupled magnetic fields suppress the extension of liquid bridges, with this suppression effect being augmented by increasing ion concentration and electric field strength. Nevertheless, the enhancement of the inhibition effect is not pronounced at electric field strengths up to 224 kV m −1 and within the frequency range of 50–500 Hz. Molecular dynamics simulations demonstrate that the mutual repulsion effect between water molecules and the hydration effect between water molecules and ions are intensified under the coupling field. Finally, by integrating flow field and velocity analyses, a mechanism is proposed to elucidate the hysteresis in the evolution of liquid bridges, attributed to the mutual repulsion of water molecules hydrated by deflecting ions and convecting water molecules in the coupled field. This study offers valuable insights for the development of electric–magnetic coupling separation techniques, with implications for mitigating oil contamination and facilitating dewatering treatments.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
He Xia,Xiaojie Wang,Jianyong Li,Jianfeng Li,Jia Man
Sodium alginate has good biocompatibility and is widely used in the study of drug carriers. In this paper, a method to prepare calcium alginate microspheres with high sphericity based on double emulsion droplets was proposed, in which sodium alginate is used as the innermost phase. By adjusting the density of the system, the double-emulsion droplets could be suspended in the collecting solution, leading to the homogeneous reaction between the sodium alginate droplets and the calcium ions. By changing the flow rate, the size of the droplets could be changed, and by changing the concentration of calcium ions in the collecting solution, the sphericity of the calcium alginate microspheres could be changed. Then the swelling properties and drug release properties of calcium alginate microspheres were determined. The drug delivery study revealed that the insulin-loaded Ca-Alginate microspheres were able to decrease blood glucose by 41.4 % after oral administration to mice. Thus, the Ca-Alginate microsphere is a suitable candidate for controlled pH-sensitive drug delivery.
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PubMed
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2024
·
IF 3.7
Donghai Yang,Mofan Li,Qing Yun,Huayao Sun,Qing Li,Xuedong Gao,Chaohui Chen,Limin He
Electrocoalescence technology can efficiently dehydrate waxy crude oil but the mechanisms are still unclear. Herein, the continuous microscopic behaviors of droplet falling, deformation, and coalescence were experimentally investigated to clarify the dynamic response mechanism of droplet in waxy oil under an electric field. The results showed the droplet falling under both gravity and electrostatic attraction to deform by the electric field force. Moreover, the expansion and clamping of the liquid bridge resulted from the competition between electric field force and capillary force. However, the precipitated wax crystals reduced the kinetic energy of the droplet and affected its external circulation, thus delaying the falling time. In addition, the wax crystals with interfacial activity adsorbed on the oil-water interface and cross-linked to form a spatial network structure, thereby weakening droplet deformation, hindering liquid film drainage, and inhibiting liquid bridge expansion. Importantly, the droplet adsorbed wax crystals exhibited interfacial elasticity, which makes them more inclined to partial coalescence. The low-frequency pulsed direct current (PUDC) electric field with high strength intermittent effect displayed the most obvious inhibition effect on the wax crystals. Overall, these findings look promising for future design and optimization of high-efficiency electric dehydrators and related fields.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2025
·Vol. 36
·期 4
·e70082
·
IF 3.4
Menghan Zhong,Qiwei Zheng,Ziyun Li,Shengwei Fang,Renfeng Zhou,Chao Wang,Yanlin Ye,Min Xia,Huagang Ni,Yanrong Jia,Peng Ye
Due to the discharge of oily wastewater and oil extraction activities, the oil content and soluble pollutants in water bodies are increasing, causing serious damage to the environment. Therefore, materials with superhydrophilicity and underwater superhydrophobicity have attracted much attention in the field of oil–water separation. In this study, a graphene oxide (GO) brush (polyacrylic acid [PAA], grafted on GO) high-efficiency hydrogel oil–water separation membrane with superhydrophilicity in air and superhydrophobicity under water was prepared by regulating the hydrophilicity through nano-microstructures. Vacuum-assisted filtration was utilized to prepare GO brushes into membranes. Due to the good hydrophilicity of PAA chains, grafting them onto GO sheets enhanced the hydrophilicity of the membranes and increased the surface roughness. This modification significantly increased the pure water flux of the membrane (maximum value of 428.56 L m −2 h −1 bar −1 ). With the synergistic effect of hydration capacity and layered nanostructures, the GO-PAA membrane possesses superhydrophobic and underwater superoleophobic properties. As a result, the oil–water separation rate of GO-PAA2 membrane was greater than 99.12%, which could realize the separation of various oil–water emulsions. Compared with the pristine GO membranes, the graphene brush membranes formed after PAA chain-branch polymerization have higher stability and durability, stronger hydrophilicity, higher oil–water separation efficiency, and better application prospects.
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