Materials Today Physics
·
2023
·
IF 11.5
Huiying Xiang,Yuan Yuan,Tao Zhu,Xu Dai,Cheng Zhang,Yu Gai,Ruijin Liao
In recent years, the lubricant depletion in slippery lubricant-infused porous surface (SLIPS) has been widely concerned, which limits its application in anti-icing. The lubricant stability is determined by three main factors including lubricant storage, depletion, and self-healing rate after depletion. However, many studies only consider one or two factors and there is a lack of systematic research on the anti-icing durability of the improved SLIPS. Herein, considering the “storage-depletion-healing” of the lubricant, a dendritic porous structure was fabricated, and the pore depth ratio and surface porosity were optimized. Additionally, the anti-icing durability of the dendritic slippery surface (Y-SLIPS) was investigated. The results show that the optimal pore depth ratio (upper pore to lower pore) and surface porosity are 1:2 and 66%, respectively. Compared to the traditional slippery surface (I-SLIPS), the Y-SLIPS has better anti-icing durability in frost and icing environment. The Y-SLIPS exceeds 20 kPa at the 140th frosting/defrosting cycle, while the I-SLIPS reaches this value at the 100th cycle. When maintaining extremely low ice-adhesion strength, the Y-SLIPS can withstand 190 icing/deicing cycles, far more than that of the I-SLIPS. The optimal dendritic porous structure further improves the anti-icing durability of the slippery surfaces, which lays the foundation for its anti-icing application.
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CHEMICAL PAPERS
·
2023
·Vol. 77
·期 10
·5873-5880
·
IF 2.2
Zhou Jialin,Fei Jiayu,Zeng Cheng,Quan Hong Hua,Li Ming
Stably retaining the water-soluble molybdate within electrodes is of great significance in phosphate analysis. This study fabricated an [Omim] 6 Mo 7 O 24 carbon paste electrode (OCPE), which was able to effectively retain molybdate in the aqueous solution. The electrochemistry of phosphate at the surface of the OCPE was studied using cyclic voltammetry (CV). The voltammograms showed three reversible redox peaks corresponding to the redox of Mo(VI/V) as well as several irreversible peaks involving the formation of hydrogen molybdenum bronze. The currents of all three reversible redox peaks linearly varied versus phosphate concentrations in 0.1 mol·L −1 H 2 SO 4 -KCl. After optimizing the mass ratio of the [Omim] 6 Mo 7 O 24 and carbon powder, peak C6 shows a wide linear range (1.0 × 10 –2 –1.0 × 10 –7 mol·L −1 ; R 2 = 0.9970) with a sensitivity of 5.3 (± 0.1) μA/μM. The limit of detection (LOD = 3 σ /s) was 8.5 × 10 –8 mol·L −1 . Interferences from common anions, silicate, and glyphosate on phosphate analysis were also investigated. The proposed sensing method was successfully applied to the determination of phosphate in tap water, whose results were verified with ion chromatography (IC).
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PHYSICS OF FLUIDS
·
2023
·Vol. 35
·期 3
·
IF 4.6
Rong Feng,He Limin,Lǚ Yuling,Lu Xiaolei
To investigate the force model and motion law of oil droplets in water near the wetted wall, oil droplets with R 1 = 0.29–0.62 mm and oil films with R 2 = 1–6 mm are solved numerically. In addition to buoyancy, flow resistance, and added mass force, the film-induced force triggered by the wetted wall constraint is also introduced into the force model. The drainage process is described using the Stokes–Reynolds equation, and the Young–Laplace equation is used to calculate the pressure within the water film. The results show that the force model can be coupled with the Stokes–Reynolds–Young–Laplace model equation to better describe the drainage dynamics near the wetted wall. The pressure distribution law is closely related to the shape of the water film, especially when the oil–water interface is in the shape of a dimple, which can lead to the formation of negative pressure zones within the water film. The maximum pressure first grows in an exponential, then logarithmic pattern and eventually approaches the equivalent Laplace pressure. Around the critical size, the direction of the film-induced force changes and the form of action switches between driving and drag forces. The film-induced force's dominant effect is strongest when the curvature radius of the oil film is comparable to the droplet size.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 21
·e53879
·
IF 3
Lihong Wan,Sitong Yan,Lin Fang,Zhifen Wang,Yucang Zhang
As key platforms for efficient photothermal conversion and water evaporation in solar water desalination processes, the design of photothermal interface materials have become an important topic. In this study, we designed an interfacial solar evaporator with liquefied-chitin PU foams as the base material. In this structure, polyaniline and polypyrrole convert solar energy in thermal energy. After the in-situ generation of hydrogel in the polyurethane foam to reduce the evaporation enthalpy of water and rapid evaporation of water. Liquefied-chitin make a PU foam with low thermal conductivity, reduce the heat loss of the water. Notably, the excellent antibacterial property of liquefied-chitin PU foam can make the photothermal material less likely to grow bacteria in the water and affect the photothermal evaporation efficiency. The water evaporation rates of PANi/PAM and PPy/PAM reached 2.18 and 2.38 kg m −2 h −1 under 1 solar irradiation, with photothermal conversion efficiencies of 136.9% and 149.4%, respectively. This study provides a simple method for converting polymers-based foam into efficient solar thermal materials for solar-driven desalination-related applications.
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ACS Sensors
·
2023
·
IF 8.9
Wei Liu,Zihan Wang,Zhongping Liu,Junxue Chen,Lingyan Shi,Longjin Huang,Yu Liu,Sheng Cui,Xuan He
The surface-enhanced Raman scattering (SERS) technique is a promising method for the detection of explosives such as 2,4,6-trinitrotoluene (TNT) and 3-nitro-1,2,4-triazol-5-one (NTO) because of its high sensitivity to trace substances. However, most SERS detection processes are often nonautomated as well as exhibit low efficiency and toxic exposure, which often poses potential danger to operators. Herein, we propose the integration of SERS with digital microfluidics (SERS-DMF) for automated, high-throughput, and high-sensitivity detection of explosives. First, we carefully designed a DMF chip comprising 40 drive electrodes and 8 storage electrodes to achieve a high-throughput process. And different concentrations of target molecules, silver nanoparticles (Ag NPs), and salts were loaded into the DMF chip. Then, the droplet aggregation, incubation, and detection processes were automatically controlled using the SERS-DMF platform. In addition, Ag NPs were efficiently aggregated by screening different types and concentrations of salts, resulting in “hotspots” and the SERS effect. With the help of the SERS-DMF platform, two explosive samples were automatically detected with high throughput and high sensitivity. The detection limits of TNT and NTO were 10–7 and 10–8 M, respectively. In addition, compared with nonautomatic operations, the SERS-DMF platform exhibited better reproducibility and higher efficiency for the detection of explosives. The proposed SERS-DMF thus has considerable potential as an analytical technique for detecting hazardous substances.
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PubMed
高影响因子
Polymers
·
2023
·Vol. 15
·期 8
·1882
·
IF 5
Gao Cai,Haisong Ni,Xunzhang Li,Yangxin Wang,Huaixia Zhao
Silica aerogel microspheres show great potential in various fields as fillings in different materials. It is important to diversify and optimize the fabrication methodology for silica aerogel microspheres (SAMS). This paper presents an eco-friendly synthetic technique for producing functional silica aerogel microspheres with a core–shell structure. Mixing silica sol with commercial silicone oil containing olefin polydimethylsiloxane (PDMS) resulted in a homogeneous emulsion with silica sol droplets dispersed in the oil. After gelation, the droplets were transformed into silica hydrogel or alcogel microspheres and coated with the polymerization of the olefin groups. Microspheres with silica aerogel as their core and polydimethylsiloxane as their shell were obtained after separation and drying. The sphere size distribution was regulated by controlling the emulsion process. The surface hydrophobicity was enhanced by grafting methyl groups onto the shell. The obtained silica aerogel microspheres have low thermal conductivity, high hydrophobicity, and excellent stability. The synthetic technique reported here is expected to be beneficial for the development of highly robust silica aerogel material.
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PubMed
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2023
·
IF 2.3
Hong Xiaozhe,Zheng Zhijun,Gao Yan
Although a large number of bionic superhydrophobic surfaces have been reported in recent years, their poor robustness remains to be improved. Herein, we present a method to fabricate a hierarchical micro-nanostructure on Ti6Al4V with excellent robustness by combining laser direct writing technology and hydrothermal treatment. Microscale pore array pattern with hard oxide layer was generated by laser irradiation, which provided protection for the nanowires later grown in situ by hydrothermal treatment. After low surface energy molecular modification, the composite surface exhibited outstanding wetting properties with a contact angle of 165.2° and a roll-off angle less than 1°. We focused on the mechanical and chemical stability of the as-prepared superhydrophobic surface (SHS), and the performance tests included water jet impact, cyclic friction, solution immersion, heat treatment and UV irradiation. Additionally, the SHS was transformed into slippery liquid-infused porous surface (SLIPS) by lubricant injection, which expends the applications of the hierarchical micro-nanostructure surface. Considering the loss degree and the self-repairing performance of the lubricants with different viscosities, we can conclude that the lubricant with a viscosity of 350 mPa·s matches the SHS substrate best. The constructed SHS and SLIPS show remarkable robustness and versatility and may be applied in various fields.
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Coatings
·
2023
·Vol. 13
·期 4
·732
·
IF 3.4
Bo Li,Jie Bai,Lei Fan,Xianyin Mao,Zhimin Ding,Hao Mu,Guoyong Liu,Yuan Yuan
Slippery liquid-infused porous surfaces (SLIPS) have received growing attention as promising icephobic materials. In this study, SLIPS were prepared on aluminum alloys by combining anodization and infusion of common silicone oil. An SLIPS with low ice-adhesion strength (6 kPa) was obtained by optimizing the anodizing time parameters (10 min). In addition, the frosting process and freezing of water droplets on the as-prepared SLIPS at −10 °C were delayed for 2000 s and 4800 s, respectively. Simultaneously, the as-prepared SLIPS also exhibited excellent anti-icing performance in glaze ice, since the supercooled water drips/ice slipped from the surface. The ice weight of the as-prepared SLIPS was significantly lower than that of the bare aluminum surface and the anti-icing-fluid-coated aluminum surface, which was reduced by 38.2%–63.6% compared with the bare aluminum surface. The ice weight increased with decreased temperature and inclination angle. This work proposes a method suitable for large-area preparation of SLIPS that achieves excellent anti-icing performance and significantly reduces the weight of glaze ice.Keywords:slippery liquid-infused porous surfaces;anti-icing;glaze ice;ice-adhesion strength
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Dongdong Gao,Fang Cheng,Yong Wang,Chunmei Li,Eva Murong Yang,Chao Li,Lijun Zhang,Gang Cheng
Much effort in resource recycling and recovery has been devoted to developing durable materials for separation, but their versatility for emulsions and immiscible oil/water mixtures was far from ideal. In this work, a superhydrophobic sponge (MS-EP-APT) was developed using asphaltene (APT), melamine sponges (MS) and polyethyleneimine (PEI) for demulsification and water-oil mixture separation. These three easily obtained materials came from either oil refinement residue or low cost chemicals. The surface wettability , chemical stability, and mechanical durability of the sponge were analyzed to determine its separation potential. This sponge exhibited great separation efficiency for immiscible oil/water mixtures (> 96.0%), surfactant stabilized water-in-oil (W/O) emulsions (> 96.0%) and anionic surfactant-stabilized oil-in-water (O/W) emulsions (> 98.0%). It demonstrated good reusability and salt tolerance even in seawater . The separation mechanisms were proposed to be related to the hydrophobicity , positive charge, and torturous channels of the sponge. These superior performances make our sponge a strong candidate for green manufacturing and engineering in resource recovery and environmental remediation.
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Nano Energy
·
2023
·
IF 17.6
Zhong yuan You,Xin Wang,Fuqi Lu,Shuting Wang,Bingxi Hu,Lian Li,Weihai Fang,Ying Liu
In this work, we design and fabricate a miniature direct current (DC) windmill generator based on dynamic semiconductor/metal Schottky triboelectric nanogenerators (TENGs), demonstrating a novel way for DC electrical power generation by harvesting wind energy. The semiconducting Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) film and metallic Al foil are designed as the positive-negative friction pair in the DC-TENG, and the softness as well as workability of the friction materials provides excellent flexibility for the design and tailor of a windmill DC-TENG. We systematically studied the effect factors on the output performance of the device, including wind speed, external load, and dimensions of the friction layers. Our device achieves an optimal output performance with a maximum open-circuit voltage (V oc ) of 0.6 V and a maximum short-circuit current (I sc ) of 3.6 μA at the wind speed of 7 m/s for the friction layer area at 2.5 cm 2 . To improve the wear resistance of the devices, we introduce a few lubricating materials at the PEDOT:PSS /Al interface and Polyalphaolefin 4 (PAO 4) can improve both the abrasiveness as well as the V oc and I sc . Our work presents a possible strategy for fabricating miniature windmill DC-TENG and provides a potential supplemental for the traditional electrical magnet windmill with heavy equipment.
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高影响因子
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
·
2023
·
IF 3.8
Suchen Wu,Liangyu Wu,Juan Chen,Chengbin Zhang,Xiangdong Liu,Yongping Chen,Wei Gao
Droplet splitting in fractal tree-shaped microchannels is studied experimentally in this work. Four flow patterns of droplets splitting in fractal tree-shaped microchannels are distinguished according to the level of bifurcations that all the droplets breakup. The self-similar variation of the droplet pressure and velocity are discussed. And the effect of capillary number and droplet size on the size distribution of daughter and granddaughter droplets are examined quantitatively. The results indicate that the tree-shaped networks with φ = 90° are better than the φ = 120° for the sequential breakup of droplets. Asymmetry in the breakup accumulates as the droplets enter high-level branch channels. Increasing Ca is an effective approach in maintaining the monodispersity of daughter and granddaughter droplets since non-breakup regime is eliminated in the low-levels of branch channels. The performance of splitting droplets is deteriorated as the mother droplet size decreases, that increasing inactive branch channels are observed.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 24
·2300308
·
IF 19
Haonan Li,Yijing Yang,Xun Zhu,Hong Wang,Dingding Ye,Yang Yang,Qiang Liao,Rong Chen
Flexibly and precisely controlling bubbles is of paramount significance for biological and chemical analysis, reaction engineering, etc. However, the buoyancy force acting on bubbles is significant, making it difficult to precisely manipulate bubbles. Particularly, controlling the anti-buoyancy motion of bubbles remains a fundamental challenge. Herein, a versatile light strategy for manipulating the anti-buoyancy motion of bubbles via a photosensitive substrate is developed. Upon focused laser beam irradiation, an intense Marangoni effect associated with non-uniform temperature distribution is induced underneath the bubble. The created excess Laplace pressure drives the bubble to move against the buoyancy force downward to the focused-laser-acted region, manifesting an excellent phototaxis motion. Theoretical analysis demonstrates that the Marangoni effect is responsible for actuating the anti-buoyancy motion of a bubble. With this light strategy, the bubble collection, transportation, and on-demand release can be flexibly implemented. Moreover, the phototaxis motion of bubbles inspires a manipulation protocol via the integration of 3D-structured design of photosensitive substrate. This light strategy for manipulating bubbles not only possesses sufficiently high accuracy and quick response, but also circumvents the limitation of the liquid volatility and multi-dimensional motion, which provides new ideas for rational control of bubble behaviors.
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