LANGMUIR
·
2025
·
IF 3.9
Yanru Zheng,Yifan Yan,Yuting Du,Fuchao Yang,Zhiguang Guo
The challenge of alleviating the water scarcity crisis is a serious problem faced worldwide. Harvesting water from atmospheric fog is an intriguing process. Taking inspiration from the multilayered micro-nanostructure of Phyllostachys leaves and the wetting gradient of spider silk combined with the leaf vein like pattern, a biomimetic system with hybrid and gradient wetting surfaces was designed and manufactured using laser etching technology and gradient anodizing technology. Under the synergistic effect of wetting driving force and gravity, the discharge of droplets was accelerated, thereby improving the efficiency of fog water collection, which is about 80% higher than the control sample. This sample integrates droplet capture, coalescence, and transportation functions, providing a new approach for the design of efficient mist collectors.
研究领域:
材料科学
·
环境科学
·
仿生学
·
表面工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Guangyu Zhang,Xin Zhang,Meng Li,Zhaohui Su
A strategy combining polyelectrolyte multilayer (PEM) deposition and counterion exchange was developed to fabricate wettability gradient surfaces on rough aluminum with wetting characters continuously varied from superoleophilic to superoleophobic. Counterion exchange kinetics was adopted as a means to tailor the surface chemical composition spatially, with the gradient ultimately reflecting position-dependent immersion time during the dipping of substrate in salt solution. Wettability depended on the identity and concentration of the counterion in the outermost PEM layer. Gradients could be erased and rewritten through the exchange of counterions, and the gradient’s wetting character was evaluated by measuring both water and oil contact angles. The surface chemical composition gradient was further investigated by X-ray photoelectron spectroscopy.
研究领域:
材料科学
·
表面化学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Wei Hu,Yang Yang,Yunan Li,Fei Xu,Fubing Bao,Zhekai Gao,Xiaolong Li,Xiaoyan Gao
The study developed a thermoresponsive film to achieve autonomous fluid driving in microfluidic channels, simplify microfluidic systems, and improve their operability. This film has a lower critical solution temperature (LCST), exhibiting different wettabilities on each side of the LCST, and showed improved hydrophilicity-to-hydrophobicity conversion with increased substrate roughness, maintaining stability after repeated cycles. The thermoresponsive film was applied to the inner wall of the glass capillary, which showed a hydrophilic and enhanced capillary effect below the LCST and a hydrophobic and weakened capillary effect above the LCST. Subsequently, the modified capillary was placed under a dynamic temperature gradient, and the force analysis of the fluid in the flow channel was carried out. It was found that only when the driving force exceeded the axial resistance could the fluid migrate. Experimental analysis showed that fluid length was directly proportional to axial resistance and inversely proportional to both driving force and migration velocity at a constant dynamic temperature gradient. Additionally, the temperature of the hot end of the capillary was varied to form different dynamic temperature gradients. A higher dynamic temperature gradient resulted in greater fluid displacement and velocity at a constant fluid length. The results presented in this study were expected to provide new insights into the design and optimization of thermally driven microfluidic systems.
研究领域:
材料科学
·
微流体力学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 51
·2305411
·
IF 19
Na Meng,Yufei Zhang,Yanyan Lin,Cengceng Zhao,Zhaoling Li,Xianfeng Wang,Jianyong Yu,Bin Ding
Developing textiles with rapid moisture-wicking capability is a potential and effective solution to the poor comfort of medical and health-protective clothing. However, designing protective clothing that combines safety and comfort remains a crucial and formidable task. Herein, a moisture-wicking protective fibrous membrane (MWPFM) with a dual-gradient structure manufactured by electrospinning and electrostatic spraying techniques is proposed. Interestingly, the protective layer with a small pore structure and an extremely hydrophobic effect can block water, blood, and ethanol. Additionally, the textile is designed in a multilayer configuration with a wetting gradient and pore structure gradient, ensuring comfort. The MWPFM exhibits excellent protective properties (ethanol contact angle of 115°, hydrostatic pressure of 14.8 kPa) and comfort (breathability of 46.8 mm s −1 , water vapor transmission rate of 5.9 kg m −2 d −1 ). In addition, compared with the commercially available high-density polyethylene protective membrane, MWPFM displays a distinct comfort advantage. This work provides a fresh avenue to improve the thermal-moisture comfort of medical and health-protective clothing.
研究领域:
纺织材料学
·
生物医学工程
·
防护材料研究
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 134
·期 10
·
IF 1.866
Ranwen Ou,Yaqin Wang,Huacheng Zhang,Huanting Wang,Tongwen Xu
Three kinds of high-flux ultrafiltration membranes were fabricated by blending strongly charged polymer [sulfonated poly(phenylene oxide) (SPPO)] with neutral polymer [cellulose acetate (CA), polyethersulfone (PES), or polyvinylidene fluoride (PVDF)]. After blending with SPPO, the pure water flux of CA-SPPO, PES-SPPO, and PVDF-SPPO membrane increase by 3, 76, and 30 times at a transmembrane pressure of 100 kPa. Compared with the unblended membranes, the pore radius of CA-SPPO, PES-SPPO, and PVDF-SPPO membrane increased from 31.9 to 33.2 nm, 26.1 to 28.6 nm, and 19.8 to 25.7 nm, respectively. The addition of strongly charged polymer decreased the thermodynamic stability of casting solutions, promoting the phase inversion process and resulting in highly porous structure. The charged groups and hydrophilicity of the polymer facilitate the formation of an additive concentration gradient (more additive in the active layer), endowing the blend membrane with better hydrophilicity and greater wettability gradient. The high porosity, good hydrophilicity, and larger wettability gradient enable the high permeation of blend membranes. This work shows how the strongly charged polymer affects the formation and performance of blend membrane, which will be useful for designing high-performance membrane. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44570.
研究领域:
材料科学
·
化学工程
·
聚合物科学
✓ 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）