ENERGY
·
2024
·
IF 9
Wei Yu,Chao Liu,Xijie Ban,Liyong Xin,Shukun Wang
When siloxanes are used as the working fluids of organic Rankine cycle systems, there is a possibility of air infiltration due to the large vacuum present in the condenser. To address this issue, experimental and simulation studies were conducted on the thermal stability and pyrolysis product characteristics of octamethyltrisiloxane (MDM) in the presence of air. The results indicated that air significantly promotes the decomposition of MDM at the temperatures above 250 °C. Air was helpful in increasing the formation of CH 2 O, CO, and CO 2 , and also enhanced polymerization of decomposition product of siloxane, leading to higher yields of MD 2 M, MD 3 M, MD 4 M, D 3 , D 4 , and D 5 . By combining reactive force field molecular dynamics (ReaxFF-MD) simulations with density functional theory (DFT) calculations, the microscopic mechanisms of MDM's oxidative decomposition by O 2 in air and H 2 O under humid conditions were elucidated. O 2 can easily combine with unsaturated Si atoms to form Si-O bonds, combine with CH 3 radicals to form C-O bonds, and undergoes hydrogen extraction reactions to initiate decomposition. H 2 O mainly undergoes initial decomposition through CH 3 radical hydrogenation and binding with unsaturated Si atoms. The generated O 2 H, O, and OH radicals tend to bind with Si atoms in molecules and radicals, facilitating polymerization reactions.
研究领域:
化学工程
·
材料科学
·
计算化学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Cuicui Su,Lingling Zhang,Yuanzheng Zhang,Xiaocheng Huang,Yumin Ye,Yu Xia,Zhiyi Gong,Xiaojuan Qin,Yichao Liu,Shishang Guo
In the background of air pollution and regular COVID-19 prevention, personal protective masks are necessary for our daily life. However, protective masks with high PM0.3 filtration usually have poor air permeability and are mostly disposable, leading to a heavy burden on the environment. In this work, a reusable membrane based on piezoelectric poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] nanofibers embedded with BaTiO3 nanoparticles (BTO NPs) was developed. The P(VDF-TrFE)/BTO composite nanofibers not only have enhanced piezoelectricity and surface polarity but also have reduced diameters that could be beneficial for electrostatic adhesion, pole–polar interactions, and mechanical sieving to increase the PM0.3 capture capacity. Moreover, the BTO NPs also improved the charge storage capacity of the composite membrane, which could further enhance the PM0.3 filtration efficiency after corona treatment. The piezoelectric mask based on P(VDF-TrFE)/BTO composite nanofibers has high filtration efficiencies of 96% for PM0.3 and 98% for bacteria, while the pressure drop was only 182 Pa, which is lower than the commercial N95 standard of 343.2 Pa. Furthermore, the piezoelectric mask has a long and stable filtration performance after 5 cycles of 75% alcohol disinfection, demonstrating that the P(VDF-TrFE)/BTO composite membrane has a potential application in personal protective masks with comfortable and reusable properties.
研究领域:
材料科学
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环境科学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
FIBERS AND POLYMERS
·
2025
·
IF 2.3
Pan Xianmiao,Wang Hongjie,Wang Jiani,Wang He,Shi Hu,Wang Shubo,Ruan Fangtao,Feng Quan
Thermoplastic polyurethane (TPU) electrospun membrane is an ideal substrate material, especially in waterproof breathable membranes due to its superior mechanical properties and flexibility. Herein, we fabricate a TPU-based composite membrane by decorating ground polyacrylonitrile (PAN)-derived carbon nanofibers (CNFs) through ultrasonication followed by a dip-coating of polydimethylsiloxane (PDMS). The decorated CNFs can build up roughness on the membrane, and the coated PDMS layer can protect the CNFs from detaching from the membrane and increase the mechanical properties of the composite membrane. The obtained TPU/CNFs/PDMS membrane displays excellent waterproof and breathable ability. Specifically, the air permeability of the composite membrane is 7.38 mm/s, and the moisture permeability amounted to 5610 g/m 2 /day. Besides, the TPU/CNFs/PDMS membrane exhibited an outstanding tensile strength of 19.407 MPa, elongating at a break of 155.76%. This novel TPU-based composite membrane exhibits great application potential in functional fabric, especially for personal protective fabrics.
研究领域:
材料科学
·
纺织工程
·
功能材料
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Nan Lu,Mengtong Yi,Zuheng Wu,Yuchen Yang,Yukui Gou,Shaofan He,Weilong Cai,Yuekun Lai,Jianying Huang
Particulate emissions from high temperature pose a significant threat to air quality, necessitating advanced air filtration materials capable of withstanding extreme temperatures and complex environmental conditions. Here, we report a high-efficiency and high-temperature resistant polyimide/SiO 2 (PI/SiO 2 ) nanofiber membrane with excellent air permeability (146 mm/s) and electrostatic effects (−1500 V), fabricated via multi-needle electrospinning followed by thermal imidization. Interface regulation through SiO 2 incorporation enhances the membrane's permeability by expanding fiber spacing and increasing tortuosity, thereby prolonging particle-fiber collision time and improving passive filtration performance. The PI/SiO 2 fibers also generate self-sustained electrostatic charges through friction with air and inter-fiber contact, imparting active filtration capability. By controlling and increasing the SiO 2 content at a constant spinning amount, a balance between filtration efficiency and pressure drop was achieved through enhanced air permeability. Under continuous filtration at 260 °C for 240 min, the membrane exhibited exceptional PM0.3 filtration efficiency (99.1668 %) with a modest pressure drop (109 Pa). Furthermore, by integrating electrospun membranes with filter bags and conducting industrial dust simulations, it achieved an ultrahigh filtration efficiency of 99.9993 % with a pressure drop of only 133 Pa. The successful development of PI/SiO 2 nanofiber membranes provides a promising strategy for next-generation high-temperature-resistant air filters.
研究领域:
材料科学
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环境工程
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纳米技术
·
化学工程
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产品关联
DOI
高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 10
·6291-6302
·
IF 3.917
Sheng Junjiao,Li Junrong,Zhao Lihong
The oleophilic nature of paper often limits its use in applications that involve direct contact with grease, but now the generation of oil-repellent surfaces has almost universally deployed environmentally detrimental approaches relying on fluorinated compounds. In this paper, non-toxic fluoro-free grease-proof papers coated with sodium alginate (SA)/sodium carboxymethyl cellulose and SA/propylene glycol alginate were prepared, the maximum of kit values reached 9. The coatings completely covered the base paper surface and penetrated into the interfiber networks to some extent, and the modified mechanical properties were obtained. It was found that the lower the air permeability was, the better the oil resistance of the biopolymer coatings on fiber substrate was. For coatings with high surface energy, as the surface energy is dominated by the polar part, the stronger the polarity, the greater the repulsion to oil. The reduction of surface energy can effectively improve the anti-wettability for oil and water.
研究领域:
材料科学
·
化学工程
·
环境科学
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产品关联
DOI
高影响因子
ACS Sensors
·
2025
·
IF 9.1
Xinyuan Ye,Leqi Li,Zonglei Wang,Yuli Wang,Jiawei Yang,Meiqiong Zheng,Mingzhe Wang,Zichong Ji,Shihong Lin,Yujie Zhang,Jian Luo,Junhong Yi,Pengcheng Zhou,Xuanwen Cao,Xuezhong He,Yan Wang
Long-term, high-fidelity electrophysiological monitoring requires epidermal electrodes that simultaneously offer conformability, breathability, and mechanical durability─attributes rarely achieved in current designs─through a scalable, simple, and low-cost fabrication strategy. We report a 5.2-μm-thick, transparent, air- and vapor-permeable “tattoo” electrode that adheres to the human skin through water-activated hydrogen bonding provided by a NaCl/glycerol/water hydrating solution, echoing the mechanism of temporary tattoos. The fabrication process is easy, efficient, and scalable. The device consists of a poly(vinyl alcohol) matrix reinforced by an electrospun polyurethane nanomesh, yielding an interfacial area adhesion energy of 2060.8 μJ cm–2, and a low skin contact impedance of 21.0 kΩ at 100 Hz. Unlike conventional hydrogel or dry electrodes, our design needs no external adhesive layer, resists dehydration, and withstands everyday mechanical stress while remaining comfortable to wear. It exhibits an air permeance of 0.94 cm3 cm–2 s–1 cmHg–1, a water-vapor transmission rate of 1856.5 ± 36.9 g m–2 day–1, and survives 1000 cycles of 100% uniaxial strain. The electrode also retains >81.4 ± 1.7% of its initial water content after 7 days of storage and maintains its stretchability, adhesion, skin contact impedance, and conductivity even after 60 days. These properties enable reliable, minimized motion artifact acquisition of biosignals during vigorous activities and extended daily use. Finally, we demonstrate wireless surface electromyogram that tracks muscle-recruitment dynamics during strength-training and rehabilitation exercises, including push-ups and climbing, underscoring the potential of the tattoo electrode for real-world wearable health monitoring.
研究领域:
生物医学工程
·
可穿戴电子器件
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柔性电子器件
·
生物传感器
·
材料科学
·
生物力学
·
健康监测
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Chao Hou,Md All Amin Newton,Binjie Xin,Tingxiao Li
Wound infection caused by excessive exudate leads to overhydration of wounds and prevents wound healing. Thus, there is a need for a wound dressing to be developed that can unidirectionally export excess biological fluid while inhibiting bacterial infection. Herein, a nanofibrous bilayer membrane with a unidirectional water transport function was fabricated by electrospinning as a novel wound dressing, which can export excess biological fluid efficiently and further inhibit bacterial infection. The inner layer of the bilayer nanofiber membrane is polylactic acid (PLA)-zinc oxide (ZnO) nanofibers, which are hydrophobic and antibacterial. The outer layer is polyacrylonitrile (PAN)-sodium polyacrylate (SPA) nanofibers, which are hydrophilic and liquid-absorbent. The bilayer nanofibrous membrane's morphology, mechanics, thermal stability, wettability , water absorption, gas permeability, and unidirectional water transport ability were characterized and evaluated. The study showed that the nanofibrous bilayer membrane exhibited excellent physicochemical properties and biological performance, and its mechanical properties can reach 4.6 MPa. In addition, when the thickness of the hydrophobic layer is 3 µm and the thickness of the hydrophilic layer is 44 µm, the double-layer fiber membrane can effectively export the excess biological fluid in 5.09 s and prevent the wound from wetting again. The nanofibrous bilayer membrane with excellent water absorption, air permeability , thermal stability, and mechanical strength provides a feasible solution for chronic wound healing.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
·
伤口护理
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）