SENSORS AND ACTUATORS B-CHEMICAL
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2014
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IF 3.84
Shuai Liang,Xiaowei He,Fei Wang,Wangchang Geng,Xin Fu,Jing Ren,Xingmao Jiang
LiCl–Pebax 2533 composite nanofibers with different amounts of LiCl·H 2 O have been successfully synthesized by an electrospinning method. Humidity sensing properties, including the impedance versus relative humidity (RH), humidity hysteresis, and response and recovery time of these composites have been investigated. These results indicated that LiCl-added material possessed higher humidity sensitivity and LiCl–Pebax 2533 composite with LiCl·H 2 O content at 44.4 wt% displayed the best humidity sensing property. The impedance of the sensor changed nearly four orders of magnitude when the relative humidity changed from 11% RH to 95% RH and the hysteresis can be neglected. Furthermore, the response and recovery time of the sensor was 30 s and 80 s, respectively. Humidity sensing mechanism was analyzed by complex impedance spectra and the corresponding equivalent circuit.
研究领域:
材料科学
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传感器技术
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纳米材料
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生物医学工程
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环境监测
✓ 已验证
DOI
高影响因子
Membranes
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2019
·Vol. 9
·期 9
·115
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IF 0
Jiuli Han,Lu Bai,Bingbing Yang,Yinge Bai,Shuangjiang Luo,Shaojuan Zeng,Hongshuai Gao,Yi Nie,Xiaoyan Ji,Suojiang Zhang,Xiangping Zhang
Air separation is very important from the viewpoint of the economic and environmental advantages. In this work, defect-free facilitated transport membranes based on poly(amide-12-b-ethylene oxide) (Pebax-2533) and tetra(p-methoxylphenyl)porphyrin cobalt chloride (T(p-OCH3)PPCoCl) were fabricated in systematically varied compositions for O2/N2separation. T(p-OCH3)PPCoCl was introduced as carriers that selectively and reversibly interacted with O2and facilitated O2transport in the membrane. The T(p-OCH3)PPCoCl had good compatibility with the Pebax-2533 via the hydrogen bond interaction and formed a uniform and thin selective layer on the substrate. The O2separation performance of the thin film composite (TFC) membranes was improved by adding a small amount of the T(p-OCH3)PPCoCl and decreasing the feed pressure. At the pressure of 0.035 MPa, the O2permeability and O2/N2selectivity of the 0.6 wt % T(p-OCH3)PPCoCl/Pebax-2533 was more than 3.5 times that of the Pebax-2533 TFC membrane, which reached the 2008 Robeson upper bound. It provides a candidate membrane material for O2/N2efficient separation in moderate conditions.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
JOURNAL OF MEMBRANE SCIENCE
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2016
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IF 5.557
Shengnan Yu,Zhongyi Jiang,Sen Yang,He Ding,Baofeng Zhou,Kun Gu,Dong Yang,Fusheng Pan,Baoyi Wang,Sheng Wang,Xingzhong Cao
The ubiquitous tradeoff relation between membrane separation performance and swelling resistance is another great challenge other than the tradeoff relation between membrane permeability and selectivity, which significantly restricts the application efficiency of all membrane processes. In this study, graphene nanosheets (GNS) were first functionalized by polydopamine (PDA) coating followed by silver nanoparticle (AgNP) loading to fabricate Ag-PDA/GNS composites, and were then incorporated into the polyether-block-amide, Pebax 2533, to fabricate the Pebax-Ag-PDA/GNS high-performance hybrid membranes. PDA can endow GNS with increased hydrophobicity and consequently increased interfacial compatibility between GNS and Pebax matrix. Ag-PDA/GNS can decrease the crystallinity, increase the fractional free volume, and enhance the swelling resistance of Pebax membrane via multiple interactions at the interface between Ag-PDA/GNS and Pebax. AgNPs were loaded onto the surface of Ag-PDA/GNS composites via the adhesive effect of PDA. AgNPs homogeneously dispersed on the surface of Ag-PDA/GNS, which could endow the membranes with facilitated transport function towards thiophenic components. Moreover, the desulfurization performance of the Pebax-Ag-PDA/GNS hybrid membranes was evaluated using the model gasoline as a separation system. When the filling content is 6 wt%, the separation performance of Pebax-Ag-PDA/GNS hybrid membrane reaches the optimal value, with a permeation flux of 4.42 kg/(m 2 h) and an enrichment factor of 8.76 at the operation temperature of 40 °C; when the operation temperature increases to 70 °C, the enrichment factor decreases to 6.07, however, the permeation flux significantly increases to 22.53 kg/(m 2 h), outperforming most of reported data in literature.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zikang Qin,Yulei Ma,Wentao Du,Jing Wei,Jia Song,Xinyue Fan,Lu Yao,Lin Yang,Yuanfa Zhuang,Wenju Jiang,Zhongde Dai
Amine-functionalized Metal-Organic Frameworks (MOFs) stand out as highly promising materials in membrane separation technology. Nevertheless, the incorporation of amine-functionalized additives may lead to uncontrollable alterations in MOF morphology. Two intact blade-like MOFs (PEI (Polyethylenimine)-ZIF-L and PAMAM (Polyamidoamine)-ZIF-L) were successfully synthesized by controlling the conditions and then introduced into Pebax 2533 to fabricate Mixed Matrix Membranes (MMMs). Hydrogen bonding and other interactions with Pebax can be formed by PEI-ZIF-L and PAMAM-ZIF-L to enhance interfacial compatibility. Simultaneously, a reversible reaction with CO 2 molecules can be undergone by the amine groups, resulting in facilitated transport in MMMs. The CO 2 separation performance of the MMMs is enhanced by this process, with the facilitation being more pronounced under humid conditions. Under humid conditions, the CO 2 permeabilities of Pebax-PEI-ZIF-L (2 wt%) and Pebax-PAMAM-ZIF-L (2 wt%) MMMs were 639.4 Barrer and 702.7 Barrer, respectively, while the CO 2 /N 2 selectivities were 26.68 and 24.35, respectively. Both permeability and selectivity exhibited a significant increase of 200% and 130%, respectively, compared to pure Pebax. Furthermore, the MMMs demonstrated excellent long-term stability during 72 h of continuous operation in a humid environment, showcasing significant potential for industrial applications, particularly in humid flue gas carbon capture.
研究领域:
膜科学
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材料科学
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环境工程
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化学工程
✓ 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）