Nanoscale
·
2019
·Vol. 11
·期 28
·13521-13531
·
IF 6.97
Nan Pan,Juanrong Qin,Pingping Feng,Botao Song
Fibrous materials with high light transmittance exhibit great potential in a wide range of applications; unfortunately, fabrication of such materials still remains a challenge due to the strong light scattering caused by the rough fibrous structure and the voids between fibers. Window screens are commonly used in our daily life, and their unique woven structure ensures excellent mechanical properties, while the voids between wires allow light to pass through. By learning from the architecture of window screens, we proposed a novel patterned electrospinning approach with window screen like wire meshes as collectors to deposit fibers with anisotropic thickness gradients and further to improve the optical properties. The results indicated that the obtained fibrous mats closely copied the structure of the wire meshes, and exhibited unique thickness anisotropy with most of the fibers densely packed on the wires in a small area, while very few fibers sparsely suspended in the voids over a large area. Owing to the large area of the thin region within fibrous mats, the overall light transmittance of such a well-organized mat was greatly improved as compared with that of an isotropous mat. Furthermore, by carefully investigating the microstructure of the fibrous mats and simulating the electric field distribution with the software Comsol Multiphysics, a novel needle array collector with an ultra large area of voids was designed to achieve optimal light transparency. Finally, as proof of concepts, we investigated the potential use of transparent fibrous mats as a visual wound dressing and a window dust filter, respectively.
研究领域:
材料科学
·
光学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
NANO LETTERS
·
2017
·
IF 12.712
Bilal Khalid,Xiaopeng Bai,Hehe Wei,Ya Huang,Hui Wu,Yi Cui
Particulate matter (PM) pollution has caused many serious public health issues. Whereas indoor air protection usually relies on expensive and energy-consuming filtering devices, direct PM filtration by window screens has attracted increasing attention. Recently, electrospun polymer nanofiber networks have been developed as transparent filters for highly efficient PM2.5 removal; however, it remains challenging to uniformly coat the nanofibers on window screens on a large scale and with low cost. Here, we report a blow-spinning technique that is fast, efficient, and free of high voltages for the large-scale direct coating of nanofibers onto window screens for indoor PM pollution protection. We have achieved a transparent air filter of 80% optical transparency with >99% standard removal efficiency level for PM2.5. A test on a real window (1 m × 2 m) in Beijing has proven that the nanofiber transparent air filter acquires excellent PM2.5 removal efficiency of 90.6% over 12 h under extremely hazy air conditions (PM2.5 mass concentration > 708 μg/m3). Moreover, we show that the nanofibers can be readily coated on the window screen for pollution protection and can be easily removed by wiping the screen after hazardous days.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Building Simulation
·
2020
·Vol. 13
·期 4
·873-886
·
IF 2.472
Xia Tongling,Bian Ye,Shi Shanshan,Zhang Li,Chen Chun
When the outdoor PM 2.5 pollution is severe, if the windows are open, the occupants tend to be exposed to higher indoor PM 2.5 of outdoor origin. However, if the windows are closed, the ventilation rate tends to be insufficient for removing air pollutants generated indoors. Opening windows with the use of nanofiber window screens can be an alternative strategy that can balance between indoor PM 2.5 of outdoor origin and ventilation rate. This study fabricated a number of nanofiber window screens and conducted a series of experiments in a laboratory setup to measure the PM 2.5 removal efficiency and pressure drop with different window opening angles. A simple model was then developed for predicting the pressure drop, and the measured data was used to validate the model. Finally, the measured data and the validated model were used for two application cases. In the natural ventilation case, the use of nanofiber window screens can effectively reduce indoor PM 2.5 of outdoor origin, and the ventilation rate can be improved when compared with infiltration in the house. However, the nanofiber window screens could not reduce the PM 2.5 level in the kitchen with a range hood when the cooking PM 2.5 emission rate was high.
研究领域:
环境科学
·
公共卫生
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2025
·
IF 12.1
Jianing Song,Yao Luo,Jinlong Yang,Yong Li,Harry Qi,Ningyuan Xu,Huijuan Shao,Yishen Zhang,Yan Zhou,Zhenbing Luo,Deuhui Wang,Xu Deng
Window screens serve the multiple purposes of enabling ventilation while preventing the ingress of solid objects and insects. However, their intrinsic porosity makes them susceptible to fluid intrusion while maintaining ventilation, notably evident in the infiltration of high-velocity raindrops during inclement weather, flooding the room. Addressing this challenge, bilayer synergistic mesh featuring an upper superhydrophilic (SHPi) surface and a bottom Janus wettability designed is presented to withstand puncture from continuous high-speed droplets. This innovative design incorporates a dual waterproof mechanism, providing instantaneous penetration resistance through energy dissipation and long-term infiltration resistance by a stable liquid film against high-speed droplets. The SHPi-Janus bilayer synergistic mesh demonstrates exceptional capability in repelling droplet penetration at a vertical high velocity of 4.5 m s −1 , significantly mitigating droplet infiltration under most rainfall conditions in the real world. Experimental findings reveal that the droplet penetration ratio of SHPi-Janus mesh is a mere 3.6% under sustained high-velocity droplet impact, a substantial leap forward compared to the 61.1% observed with commercial screen.
研究领域:
材料科学
·
流体力学
·
界面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）