Laser irradiation method to prepare polyethylene porous fiber membrane with ultrahigh xylene gas filtration capacity

2020 ◽  
pp. 124395
Author(s):  
Junfeng Cheng ◽  
Xinghua You ◽  
Hao Li ◽  
Jun Zhou ◽  
Zhixiong Lin ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Fiber Membrane ◽  
Gas Filtration ◽  
Porous Fiber ◽  
Filtration Capacity

Preparation of PI porous fiber membrane for recovering oil-paper insulation structure

2020 ◽  
Author(s):  
Xiaorui Zhang ◽  
Xue Sun ◽  
Tong Lv ◽  
Ling Weng ◽  
Minghe Chi ◽  
...  
Keyword(s):  
Fiber Membrane ◽  
Porous Fiber ◽  
Paper Insulation

scholarly journals Waterproof-breathable PTFE nano- and Microfiber Membrane as High Efficiency PM2.5 Filter

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 590 ◽  
Author(s):  
Xiao Li ◽  
Xiao-Xiong Wang ◽  
Tian-Tian Yue ◽  
Yuan Xu ◽  
Ming-Liang Zhao ◽  
...  
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
High Efficiency ◽  
Filtration Efficiency ◽  
Poly Vinyl Alcohol ◽  
Fiber Membrane ◽  
Gas Filtration ◽  
Electrospinning Technique ◽  
Water Contact ◽  
Microfiber Membrane

This study shows the feasibility of using electrospinning technique to prepare polytetrafluoroethylene/poly (vinyl alcohol) (PTFE/PVA) nanofibers on PTFE microfiber membrane as substrate. Then, PVA in the fiber membrane was removed by thermal treatment at about 350 °C. Compared to PTFE microfiber substrates, the composite PTFE fiber membranes (CPFMs) have improved filtration efficiency by 70% and water contact angle by 23°. Experimental test data showed that the water contact angle of the sample increased from about 107° to 130°, the filtration efficiency of PM2.5 increased from 44.778% to 98.905%, and the filtration efficiency of PM7.25 increased from 66.655% to 100% due to the electrospun PTFE nanofiber layer. This work demonstrates the potential of CPFMs as a filter for the production of indoor or outdoor dust removal and industrially relevant gas filtration.

scholarly journals Study on the Effect of Porosity on Countercurrent Hollow Fiber Membrane Humidification System

2021 ◽  
Author(s):  
Runping NIU ◽  
Xiaoting Jia ◽  
Lizhi Geng
Keyword(s):  
Service Life ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Simulation Method ◽  
Film Material ◽  
Membrane Material ◽  
Fiber Membrane ◽  
Porous Fiber ◽  
Efficiency Increase ◽  
Simulation Results

Abstract The effect of porosity on the humidification efficiency of countercurrent hollow fiber membrane humidification system was investigated by using numerical simulation method to study polypropylene (PP) porous fiber membrane material. Firstly, the correctness of the numerical model was verified by experiments, and then the influence of porous fiber membrane material on humidification efficiency was further explored by changing the porosity of the model. The simulation results show that the humidification capacity and efficiency of the humidification component increase with the increase of porosity. When the porosity is between 0.35-0.8, the humidification capacity and efficiency increase significantly. However, when the porosity is between 0.8-0.9, although the humidification amount and humidification efficiency value are high, the increment is not obvious, and the porosity of the fiber film is inversely proportional to the support strength of the film, and the larger the porosity is, the shorter the service life of the film material is. Therefore, it is suggested to design the porosity of polypropylene (PP) film material between 0.65 and 0.8. It can not only ensure the high humidification capacity and efficiency of the fiber membrane, but also prolong the service life of the membrane.

Electrospun PVDF-Ag@AgCl Porous Fiber Membrane: Stable Anti-Foul and Antibacterial Surface

2020 ◽  
pp. 1-8 ◽  
Author(s):  
Ying Tian ◽  
You Shu ◽  
Xiaomin Zhang ◽  
Sakil Mahmud ◽  
Jin Zhu ◽  
...  
Keyword(s):  
Fiber Membrane ◽  
Porous Fiber ◽  
Antibacterial Surface

Fabrication of zeolite NaX-doped electrospun porous fiber membrane for simultaneous ammonium recovery and organic carbon enrichment

2020 ◽  
Vol 603 ◽  
pp. 118030 ◽  
Author(s):  
Wenyan He ◽  
Ruiqing Lu ◽  
Kuo Fang ◽  
Erfu San ◽  
Hui Gong ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Fiber Membrane ◽  
Porous Fiber ◽  
Zeolite Nax

Simulation of coupled transient heat and water vapor transfer in porous fiber membrane with different fiber orientations and porosity

2021 ◽  
pp. 152808372110417
Author(s):  
Haihong Gu ◽  
Li Gao ◽  
Guoqing Li ◽  
Ni Li ◽  
Jie Xiong
Keyword(s):  
Heat Transfer ◽  
Water Vapor ◽  
Fiber Orientation ◽  
3D Model ◽  
Diffusion Flux ◽  
Heat Convection ◽  
Fiber Membrane ◽  
Porous Fiber ◽  
Vapor Transfer ◽  
Water Vapor Transfer

The transfer process of heat and water vapor in a porous fiber membrane was investigated through the simulation of a 3D model for optimizing the configuration design. 3D models with different fiber orientations and porosity were constructed by the parameter input method, and the accuracy of the model was validated by the coefficient of determination (R2) between the apparent velocity of the model and the air permeability of the membrane. The permeability of 3D model was used to reflect the discrepancy in fiber orientation of the model. The influences of fiber orientation and porosity on heat and water vapor transfer were surveyed by the coupled physics of heat transfer and dilute substance transfer. Since there was no temperature difference in the entire domain, heat conduction (10−9 W/m2) and moisture convection (10−14 mol·m−2·s−1) were faint in the model. With the diffusion of water vapor in the moisture, the heat convection flux and water vapor diffusion flux gradually decreased and reached equilibrium. When the permeability was increased by adjusting the fiber orientation (from 1.002 to 1.200 m2), the heat convection flux and water vapor diffusion flux followed a similar growth pattern due to the coupling effect of heat transfer and water vapor transfer. The R2 for the heat convection flux and water vapor transmission rate of the simulations and experiments with different porosity (44.87, 47.64 and 50.15%) were 0.999 and 0.923, respectively, which demonstrated the validation of the simulation in heat and water vapor transfer.

scholarly journals Flexible inorganic membranes used as a high thermal safety separator for the lithium-ion battery

RSC Advances ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 4072-4077 ◽  
Author(s):  
Chuan Shi ◽  
Jianwei Zhu ◽  
Xiu Shen ◽  
Fuxing Chen ◽  
Fanggang Ning ◽  
...  
Keyword(s):  
Lithium Ion Battery ◽  
Lithium Ion ◽  
Inorganic Membranes ◽  
Thermal Safety ◽  
Fiber Membrane ◽  
Porous Fiber

A flexible SiO2 porous fiber membrane (SF) is prepared by electrospinning followed by calcination in this work.

Chronic Laser Exposure Effects on Rabbit Retina

1972 ◽  
Vol 30 ◽  
pp. 54-55
Author(s):  
Burton B. Silver ◽  
Theodore Lawwill
Keyword(s):  
Laser Irradiation ◽  
Laser Light ◽  
Broad Band ◽  
Argon Laser ◽  
Atropine Sulfate ◽  
Ultrastructural Changes ◽  
Laser Exposure ◽  
Rabbit Retina ◽  
Histological Changes ◽  
Threshold Doses

Dutch-belted 1 to 2.5 kg anesthetized rabbits were exposed to either xenon or argon laser light administered in a broad band, designed to cover large areas of the retina. For laser exposure, the pupil was dilated with atropine sulfate 1% and pheny lephrine 10%. All of the laser generated power was within a band centered at 5145.0 Anstroms. Established threshold for 4 hour exposures to laser irradiation are in the order of 25-35 microwatts/cm2. Animals examined for ultrastructural changes received 4 hour threshold doses. These animals exhibited ERG, opthalmascopic, and histological changes consistent with threshold damage.One month following exposure the rabbits were killed with pentobarbitol. The eyes were immediately enucleated and dissected while bathed in 3% phosphate buffered gluteraldehyde.

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