JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Wenting Zhou,Yuanmiaoliang Chen,Xiaojia He,Zhangxin Wang
Membrane wetting is an inevitable challenge in membrane distillation (MD). To overcome this challenge, a few dewetting techniques have been developed, but the reversibility of membrane wetting induced by various contaminants has not been well understood. Herein, we evaluate the reversibility of membrane wetting induced by different types of contaminants and elucidate the underlying mechanisms. From direct contact MD experiments and membrane wettability characterizations, membrane wetting induced by amphiphilic molecules, low-surface-tension liquids, and highly soluble salts can be easily reversed by 20-min DI water rinsing and oven drying, while to reverse membrane wetting induced by sparingly soluble salts, 3-h DI water rinsing and oven drying are required. Based on microscopic imaging and elemental mapping, the membrane wetting processes did not induce severe damage to membrane structure, and thus the hydrophobicity of the membrane can be restored after the contaminants were removed from the membrane. Furthermore, the mechanisms of the removal of different contaminants are elucidated. Specifically, after membrane rinsing and drying, the amphiphilic molecules automatically desorb from the dried membrane due to the disappearance of the underwater hydrophobic-hydrophobic interaction, while the low-surface-tension liquids leave the membrane pores because of evaporation. Additionally, during the membrane rinsing process, the highly soluble salts inside the membrane pores are dissolved, while the sparingly soluble salts detach from the membrane due to the hydrodynamic disturbance. The insights from this study shed lights on the development of effective dewetting techniques for hydrophobic membranes, which benefits not only MD but also membrane contactor applications.
研究领域:
环境科学
·
化学工程
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2016
·Vol. 34
·期 4
·475-482
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IF 1.811
Wang Wei-cai,Shi Kai,Pan Yan-xiong,Peng Chao,Zhao Zi-liang,Liu Wei,Liu Yong-gang,Ji Xiang-ling
In this work, monodisperse giant polymersomes are fabricated by dewetting of water-in-oil-in-water double emulsion droplets which are assembled by amphiphilic block copolymer molecules in a microfluidic device. The dewetting process can be tuned by solvation between solvent and amphiphilic block copolymer to get polymersomes with controllable morphology. Good solvent (chloroform and toluene) hinders dewetting process of double emulsion droplets and gets acornlike polymersomes or patched polymersomes. On the other hand, poor solvent (hexane) accelerates the dewetting process and achieves complete separation of inner water phase from oil phase to form complete bilayer polymersomes. In addition, twin polymersomes with bilayer membrane structure are formed by this facile method. The formation mechanism for different polymersomes is discussed in detail.
研究领域:
材料科学
·
生物工程
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产品关联
DOI
高影响因子
Small Methods
·
2022
·Vol. 6
·期 4
·2101509
·
IF 15.367
Xiaojie Zhou,Yichen Cai,Mingsheng Xu,Jianping Li,Chenxu Sheng,Qiuyi Zhang,Xinxia Qiu,Wenchong Wang,Shisheng Xiong,Chunxiao Cong,Zhi-Jun Qiu,Ran Liu,Laigui Hu
The emergence of near-eye displays, such as head-mounted displays, is triggering a requirement for highly enhanced display resolution. High-resolution micro-displays with micro-organic light-emitting diodes (micro-OLEDs) can be a preferential candidate, owing to the mature industrialization of OLEDs along with the advantages of flexibility, light weight, and ease of processing. However, micro-OLEDs with pixel sizes down to micrometers are difficult to be achieved using conventional techniques such as fine metal mask evaporation and lithography. Here, a solution-processing approach to pattern organic semiconductors (OSCs) for micro-OLED arrays with the assistance of templated dewetting is demonstrated. Solvents containing organic functional materials are dewetted on the surface with hydrophobic/hydrophilic patterns to form ordered droplet arrays using dip-coating. Subsequently, patterned OSC films are produced by effectively controlling solvent evaporation. Micro-OLED arrays with a pixel size down to 1 µm are successfully fabricated by further deposition of emitting/electron transport layers and top electrodes. This approach can open an avenue for low-cost manufacturing of flexible and high-resolution micro-displays.
研究领域:
材料科学
·
显示技术
·
有机电子学
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产品关联
DOI
PubMed
高影响因子
Advanced Materials Interfaces
·
2018
·Vol. 5
·期 19
·1800729
·
IF 4.834
Yinyin Lin,Zhongsheng Wu,Mengying Zhang,Jinbo Wu,Weijia Wen
Discontinuous dewetting on a prepatterned surface with regions of different dewettability is an attractive way to assemble a material into 2D microstructures with a predefined lateral size and spatial distribution on a surface. However, few studies have examined the aspect ratio or contact angles of the microstructures. In this Communication, it is found that the static contact angle changes with the lateral size of droplets and variation relationship between them shows two phases: an exponential decrease phase when lateral size is <80 µm, and a minimum plateau phase when lateral size is >80 µm, which is defined as lateral size scaling effect. After dynamically studying the droplet generation, it is proposed that liquid retraction after liquid thin film ruptures is responsible for the lateral size scaling effect. The effect of liquid viscosity and sliding speed on the lateral size scaling effect is also assessed and the lateral size scaling effect in droplet evaporation models is investigated. Finally, differently oriented single metal-organic framework crystal arrays based on the lateral size scaling effect are successfully fabricated. This work demonstrates a novel 2.5D top-down strategy to guide bottom-up assembly.
研究领域:
材料科学
·
表面科学
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产品关联
DOI
高影响因子
LANGMUIR
·
2021
·
IF 3.882
Jiao Zhu,Huaguang Wang,Zexin Zhang
The ability to tune shapes of micromotors is challenging yet crucial for creating intelligent and functional micromachines with shape-dependent dynamics. Here, we demonstrate a facile strategy to synthesize Janus micromotors in large quantity whose shapes can be precisely tuned by a surfactant-induced dewetting strategy. The Janus micromotor is composed of a TiO2 microparticle partially encapsulated within a polysiloxane microsphere. A range of particle shapes, from approximately spherical to snowman, is achieved, and the shape-tunable dynamics of the micromotors are quantified. Our strategy is versatile and can be applicable to other photoactive materials, such as ZnO and Fe2O3 nanoparticles, demonstrating a general approach to synthesize Janus micromotors with controllable shapes. Such shape-tunable micromotors provide colloidal model systems for fundamental research on active matter, as well as building blocks for the fabrication of micromachines.
研究领域:
材料科学
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纳米技术
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物理化学
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DOI
PubMed
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2018
·Vol. 36
·期 9
·1070-1076
·
IF 2.016
Zhou Yong,Bai Pei,Huo Miao,Chen Yu-Jie,Li Hua,Kang Hong-Mei,Liu He-Zhou,Guo Yun-Long
Isocyanate-treated graphite oxides ( i GOs) were well-dispersed into the polystyrene (PS) thin films and formed a novel network structure. With control in fabrication, an i GOs-web layer was horizontally embedded near the surface of the films and thus formed a composite slightly doped by i GOs. This work demonstrated that the i GOs network can remarkably depress the dewetting process in the polymer matrix of the composite, while dewetting often leads to rupture of polymer films and is considered as a major practical limit in using polymeric materials above their glass transition temperatures ( T g ). Via annealing the 50–120 nm thick composite and associated neat PS films at temperatures ranging from 35 °C to 70 °C above T g , surface morphology evolution of the films was monitored by atomic force microscopy (AFM). The i GOs-doped PS exhibited excellent thermal stability, i.e. , the number of dewetting holes was greatly reduced and the long-term hole growth was fairly restricted. In contrast, the neat PS film showed serious surface fluctuation and a final rupture induced by ordinary dewetting. The method developed in this work may pave a road to reinforce thin polymer films and enhance their thermal stability, in order to meet requirements by technological advances.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
APPLIED THERMAL ENGINEERING
·
2025
·
IF 6.9
Xue-Ying Hao,Yan Wang,Jian-Shu Liu,Xiao-Bin Li,Hong-Na Zhang,Feng-Chen Li
Effective boiling control is crucial for the thermal management in high-power electronics. Conventional passive methods lack adaptability while active electric field approaches often require high voltages or engineered surfaces. This study presents a low-voltage (<5 V) electrostatic strategy based on the electro-de-wetting (EDW) effect, using a low-concentration cationic surfactant solution and a common conductive surface. Without specialized substrates, by leveraging electric-field-driven surfactant migration and adsorption, the dynamic regulation of nucleation site density and surface temperature was achieved, reducing the heat flux required for the onset of nucleate boiling by approximately 50 % via enhanced surface hydrophobicity. The discovery of unique bubble clustering behavior multiplies nucleation at a single site by up to 5 times, while identification of a “main effective region” enhances the heat transfer coefficient by 12.0 %. The EDW effect enables reversible temporal boiling modulation, reducing copper surface temperature by 4.6 °C. This work establishes a low-voltage approach for intelligent boiling regulation, offering new paradigm for real-time, adaptive heat transfer enhancement
研究领域:
传热学
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界面科学
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电润湿
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热管理
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微尺度流体力学
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产品关联
DOI
高影响因子
Advanced Healthcare Materials
·
2024
·
IF 10
Zilin Wu,Yilin Ding,Zhihao Qin,Zhipeng Sun,Zetao Wang,Xiaodong Cao
The integration of hemostats with cotton fabrics is recognized as an effective approach to improve the hemostatic performance of dressings. However, concerns regarding the uncontrollable absorption of blood by hydrophilic dressings and the risk of distal thrombosis from shed hemostatic agents are increasingly scrutinized. To address these issues, this work develops an advanced dressing (AQG) with immobilized nano-scale mesoporous bioactive glass (MBG) to safely and durably augment hemostasis. The doubly immobilized MBGs, pre-coated with ε-poly-L-lysine and alginate, demonstrate less than 1% detachment after ultrasonic washing. Notably, this MBG layer significantly promotes the adhesion, aggregation, and activation of red blood cells and platelets, adhered five times more red blood cells and 29 times more platelets than raw dressing, respectively. Specially, with the rapid formation of protein corona and amplification of thrombin, dense fibrin network is built on MBG layer and then blocked blood permeation transversely and longitudinally, showing an autophobic pseudo-dewetting behavior and allowing AQG to concentrate blood in situ and culminate in faster hemostasis with lower blood loss. Furthermore, the potent antibacterial properties of AQG extend its potential for broader application in daily care and clinical setting.
研究领域:
生物材料
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止血
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伤口愈合
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纳米技术
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
Nature Physics
·
2025
·
IF 18.4
Liu Song,Sun Pengcheng,Wang Mingyue,Jiang Yujie,Li Jiaqi,Jia Yuyu,Sun Zhenhuan,Yang Yuting,Liu Hai,Lu Haojian,Wang Zuankai
Droplet microfluidics, a versatile technique for the precise manipulation of discrete droplets, has revolutionized biological and chemical research. So far, the successful implementation of droplet microfluidics necessitates the choice of non-wetting surfaces with minimal pinning forces, which hinders its broader adoptions in clinical applications. Here we report acousto-dewetting, a liquid dewetting principle that enables the three-dimensional, remotely controllable and precise operation of droplets on surfaces of any wettability, including superhydrophilic surfaces. This principle originates from the intricate interplay between acoustic streaming and droplet dynamics due to the extreme confinement of ultrasound within droplets, with an enhancement in pressure gradient of three orders of magnitude compared with traditional ultrasound-based approaches. We show that on superhydrophilic surfaces, acousto-dewetting achieves a contact line moving velocity that is two orders of magnitude higher than the previous limit and eliminates the undesired viscous film stemming from viscous dissipations. We developed a droplet microfluidics approach that achieves versatile droplet manipulation in various extreme scenarios associated with superhydrophilic surfaces, and applied it to an in vivo clinical setting for the rapid and safe removal of thrombus as well as drug delivery.
研究领域:
微流控技术
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生物医学工程
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超声技术
·
临床应用
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Ningfei Sun,Shuolei Zhang,Xingyu Liu,Peng Zhao,Xiaobo Xue,Nyachieo Kennedy Momanyi,Jianyu Sun,Limin Liu,Xiaoguang Wei,Ling Li,Yong Xie
Fractal plasmonic nanoantennas are widely used in plasmon-enhanced infrared spectroscopy and multiband sensing applications due to their inherent broadband and multispectral characteristics. However, conventional fractal antennas are typically fabricated by high-cost, unscalable, and complicated lithography processes. The inevitable diffraction limit restricts the fabrication of higher-order fractals and the improvement of multiband infrared response. In this study, a lithography-free Au fractal nanoantenna platform is developed via film dewetting. The antennas can support multiple resonances over a broad spectral range spanning from near-infrared to mid-infrared. The fractal orders can be controlled by adjusting dewetting times. Moreover, due to the spontaneous fractal growth mechanism, the iteration number is theoretically unlimited. Through electromagnetic field simulation and infrared spectroscopy, the fractal order-dependent multiband resonance mode and dense “hot spots” enabled electric-field enhancement are revealed. Based on the infrared-enhanced antenna, a minimum detection limit of 6 nm for the thickness of poly(methyl methacrylate) nanolayers is achieved. Additionally, a noninvasive sensor concept for glucose molecules in aqueous solution is demonstrated. This study presents a lithography-free approach for constructing high-generation and large-area fractal nanoantennas with multiband resonance capabilities, which holds great promise for trace detection and high-sensitivity biochemical sensing of various analytes in the near- to mid-infrared spectral region.
研究领域:
纳米光子学
·
等离激元学
·
红外传感
·
纳米天线
·
薄膜技术
·
生化传感
·
光学材料
✓ 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）