ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Fangbing Wang,Jing Ren,Qiwen Peng,Hongyi Sun,Qiankun Zeng,Yongheng Zhang,Guoyue Shi,Min Zhang
Plasma separation, rich in biomarkers crucial for diagnosis, is conventionally achieved via high-speed centrifugation, a method hindered by its blood usage, lengthy processes, and complex operations, which delays detection. We introduced a novel real-time blood sensing method based on a Janus membrane and enzymes @MOFs. Asymmetric driving of the janus membrane can realize spontaneous separation of plasma and prevent hemolysis during direct separation. Glucose oxidase (GOx), uric acid oxidase (UOx) and horseradish peroxidase (HRP) were encapsulated in a hydrophilic organometallic framework (MOFs) to construct an enzyme cascade nanoreactor. Embedding enzyme in hydrophilic MOFs not only retains the natural conformation of free enzyme but also improves the brittleness of enzyme, endows MOFs with new biological functions, and expands its sensing application. Using 3,3′,5,5′-tetramethylbenzidine (TMB) as a chromogen and a custom app for color interpretation, we achieved real-time visualization of glucose (Glu) and uric acid (UA) at a 50 μM limit. The system accurately analyzed serum samples, matching commercial kits and showing promise for portable, personalized diagnostics.
研究领域:
生物医学工程
·
分析化学
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2021
·
IF 9.028
Yuanmiaoliang Chen,Kang-Jia Lu,Wenxiao Gai,Tai-Shung Chung
Membranes with robust antiwetting and antifouling properties are highly desirable for membrane distillation (MD) of wastewater. Herein, we have proposed and demonstrated a highly effective method to mitigate wetting and fouling by designing nanofiltration (NF)-inspired Janus membranes for MD applications. The NF-inspired Janus membrane (referred to as PVDF-P-CQD) consists of a hydrophobic polyvinylidene fluoride (PVDF) membrane and a thin polydopamine/polyethylenimine (PDA/PEI) layer grafted by sodium-functionalized carbon quantum dots (Na+-CQDs) to improve its hydrophilicity. The vapor flux data have confirmed that the hydrophilic layer does not add extra resistance to water vapor transport. The PVDF-P-CQD membrane exhibits excellent resistance toward both surfactant-induced wetting and oil-induced fouling in direct contact MD (DCMD) experiments. The impressive performance arises from the fact that the nanoscale pore sizes of the PDA/PEI layer would reject surfactant molecules by size exclusion and lower the propensity of surfactant-induced wetting, while the high surface hydrophilicity resulted from Na+-CQDs would induce a robust hydration layer to prevent oil from attachment. Therefore, this study may provide useful insights and strategies to design novel membranes for next-generation MD desalination with minimal wetting and fouling propensity.
研究领域:
材料科学
·
环境工程
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Haiyun Li,Zhengshi Yu,Yibo Lin,Wentian Zhang,Cunxian Lai,Lichao Xia,Fangang Meng,Shanshan Zhao
Membrane distillation (MD) is a promising technology for hypersaline wastewater treatment. However, commercial hydrophobic MD membrane usually suffers from severe wetting/fouling/scaling challenges that seriously hinder its wide applications. It is urgent to develop a robust MD membrane with simultaneous wetting/fouling/scaling resistance in a facile way. In this study, a Janus membrane with a dense hydrophilic nanofiltration top layer was simply fabricated by co-deposition of pyrogallic and polyethylenimine on hydrophobic polyvinylidene difluoride membrane followed by glutaraldehyde cross-linking. The Janus membrane can maintain stable performance during long-term treatment of saline wastewater containing surfactants, oil, and/or mineral ions, suggesting its excellent simultaneous wetting/fouling/scaling resistance. The mechanisms analyses reveal that the excellent wetting/fouling resistance is owed to the combined effects of strong surface hydration barrier, size exclusion, and strong capillary force. Moreover, the positively charged amino groups on the membrane surface further enhance the scaling resistance. Remarkably, the Janus membrane demonstrated exceptional performance during long-term (>100 h) treatment of ethylene waste lye, a hypersaline organic wastewater containing a broad spectrum of contaminants. The membrane possessed stable vapor flux and exhibited near-perfect salt rejection (99 %) and organic rejection (98 %). Our study provides a simple method for designing a robust Janus membrane for treating hypersaline organic wastewater and demonstrates the significant industrial application potential of MD technology.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jiawei Mu,Miao Yu,Bo Zhao,Yan Dai,Tiantian Li,Xiangcun Li,Xinhong Qi,Xuri Wang,Gaohong He
Optimizing Zn 2+ dispersion and regulating Zn 2+ deposition is a key issue in the aqueous Zn-ion anodes. Herein, the flexible membrane (CNT/PAN/Ag) with uniformly interwoven pores was facilely fabricated by one-step phase inversion method. The complex woven pore structure can effectively disperse the flow of Zn 2+ , reduce current density of nucleation sites, and avoid the aggregated deposition of Zn 2+ . Furthermore, the scalable Janus membrane with different affinities to electrolyte on the two sides can be designed based on the membrane surface structure. The high wettability of the upper surface of the membrane with electrolyte facilitates rapid transfer of Zn 2+ flux into the membrane for redispersion, and low wettability of the back surface is benefit to isolate electrolyte from surface of the zinc anode and to avoid side reactions brought about by the aqueous electrolyte. Meanwhile, by virtue of the high adsorption energy with Zn 2+ , the doped Ag active sites in the membrane further extend the dispersion path of Zn 2+ within the membrane and induce portion of Zn 2+ to be deposited within the membrane, balancing and reducing current density at the deposition interface. In the galvanostatic current test of the symmetric battery at 1 mA cm −2 , 0.5 mAh cm −2 , the battery can be stably cycled more than 1000 h, the specific capacity of pouch cell with NH 4 V 4 O 10 reserved 384 mA h/g at 5 Ag −1 after 95 cycles. The work presents a new flexible membrane design for solving the Zn dendrites in aqueous zinc ion batteries.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
npj Clean Water
·
2024
·Vol. 7
·期 1
·1-15
·
IF 10.4
Wu Zhuobin,Zheng Ke,Zhang Guichang,Huang Longwei,Zhou Shaoqi
Membrane distillation is an emerging wastewater treatment technology that harnesses low-grade heat as an energy source and exhibits potential for complete desalination. Nonetheless, two notable challenges hinder the practical application of this technology: membrane wetting and fouling. To counter these challenges, an innovative anti-fouling Janus membrane with asymmetric wettability was developed through electrospinning. The hydrophobic layer was formed using tetraethyl orthosilicate/polysulfone (PSF), and the superhydrophilic layer was created using polyvinylpyrrolidone (PVP)/PSF. A sensitive adhesion probe was used to assess the anti-fouling performance of the Janus membrane against oil. Molecular dynamics simulation suggested that PVP reduced the adsorption tendency of the membrane for humic acid (HA). Under experimental conditions involving saline water with HA and a saline oil–water emulsion, the non-Janus membrane suffered severe fouling, resulting in rapid water permeate flux decline. However, the Janus membrane demonstrated consistent permeate flux (26.84 LMH and 24.92 LMH) and an impressive salt rejection rate (> 99.99%). This study suggests that the Janus membrane, with its high permeate fluxes and remarkable resistance to fouling and wetting, could be an effective solution for wastewater treatment, with considerable potential for future application.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2024
·Vol. 35
·期 30
·305703
·
IF 2.9
Lang Liu,Wei Wang,Ye Hong
Membrane distillation technology could utilize low-grade heat to desalinate brine, but the membrane material often suffers from disadvantages of low permeation flux and weak robustness to contaminants. To address these issues, the commercial polytetrafluoroethylene (PTFE) membrane was modified by cost-effective chemicals of tannic acid and (3-Aminopropyl)-triethoxysilane (APTES) to construct hydrophilic/underwater superoleophobic nano-rough structures on the surface to enhance its flux and oil-fouling resistance in direct contact membrane distillation. The results show that a high underwater oil contact angle of 180° is observed to the membrane surface due to the rough nanostructures functionalized by abundant hydroxyl groups. Despite the additional mass transfer resistance provided by the rough nanostructures, the flux was increased noticeably. This is mainly attributed to the strong interactions between the abundant hydroxyl groups of hydrophilic layer surface and water molecules, leading to a part of free water staying at intermediate transition state (IW). The mass transfer resistance of the hydrophilic layer itself is reduced as a consequence of decreased evaporation enthalpy of water, thereby increasing the flux. Moreover, while the flux of the pristine membrane is reduced by 84.18%, the flux of Janus membrane remains the same when treating mineral oil brine emulsions with oil concentration up to 1500 ppm in comparison with the result for 35 g l−1 brine solution, indicating that the Janus membrane is safe from the oil contamination. Our work provides a fine guidance for membrane distillation to treat high oily brine.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2025
·
IF 4.3
Xue Gao,Chaosheng Li,Chengbin Shen
To address water scarcity in arid regions, this study proposes a high-efficiency fog harvesting material development strategy based on wettability gradient regulation. Controllable assembly of polyvinyl chloride nanofibers with bead-on-string structures on hydrophilic substrate surfaces is achieved through a 5 min electrospinning process. The fabricated Janus membrane achieves a contact angle differential of 141°, establishing an asymmetric wetting structure that enables directional droplet transport. Experimental data show that its fog water collection flux is 2.1 times higher than those of traditional hydrophilic materials. Surface water droplets were absorbed by the Janus membrane in only 2 ms, while they were absorbed by the hydrophilic membrane in at least 5 ms. Moreover, after the water droplets were absorbed, the Janus membrane surface can remain in a fresh, dry state, which is conducive to further water absorption. The underlying mechanisms for the enhanced fog harvesting performance were detailed, with numerical simulations used to study the impact of the hydrophilic layer’s wettability on liquid penetration. Such a Janus membrane can be a promising candidate for fog harvesting against the water crisis.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
WATER RESEARCH
·
2024
·
IF 11.4
Chao Wang,Yangbo Qiu,Guangzhe Wang,Long-Fei Ren,Jiahui Shao
Dense Janus membranes (JMs) are potential candidates in hypersaline wastewater treatments for membrane distillation (MD). However, dense surface layers generally add obvious membrane mass transfer resistance, limiting its practical application. In this study, a novel dense JM was facilely developed by controlled interfacial polymerization utilizing a phosphonium functional monomer (THPC) on hydrophilic polyvinylidene fluoride (PVDF) substrate. MD desalination performance results showed that the optimized THPC/PVDF JM surprisingly achieved a flux even 21.3% higher than that of its substrate and exhibited robust stability to surfactants, oil, and gypsum. Importantly, potential mechanism of remarkable flux enhancement of dense JMs was revealed. Raman and DSC analyses showed that THPC/PVDF JM with elevated intermediate water content had minimal enthalpy for water evaporation, thus facilitating water vaporization. Dynamic water contact angle measurements, advanced microstructural characterization by positron annihilation spectroscopy and water permeability experiments etc. showed that THPC/PVDF JM with high hydrophilicity and appropriately enlarged effective pore sizes provided strong water-absorption capacity and water permeability, contributing to rapid water replenishment. Both synergistically contributed to an incredible increase in membrane flux. Meanwhile, the dense surface layer, featured by its strong hydrophilicity and abundant hydroxyl groups, effectively prevented complex contaminants from intruding hydrophobic substrate and discouraged oil/gypsum adhesion, ensuring stable MD operation. This study shall provide useful insights and strategies to design high-flux dense JMs with minimal membrane failure propensity, highlighting its great potential for efficient hypersaline wastewater treatments.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Xiaolong Tian,Guoyang Chen,Han Wang,Jian Cui,Ailin Gao,Yehai Yan
Janus membranes exhibit notable benefits in enhancing the anti-fouling ability during membrane distillation (MD). However, the bonding stability between the hydrophilic layer and the hydrophobic matrix is a worrying concern. In this work, we developed an interfacial free radical polymerization (IFRP) method by segregating photoinitiator and polyethylene glycol diacrylate (PEGDA) monomers into the oil and water phases, respectively. This approach facilitated a crosslinking reaction initiated at the oil–water interface, leading to the formation of a discontinuous or continuous hydrogel-like coating on one side of the PVDF membrane within a 30-second light-induced reaction. The PEGDA gel filled the membrane pores rather than growing outward along its surface, thus creating a “physical interlocking” effect and significantly enhancing their bonding stability. Anti-fouling and anti-wetting experiments were conducted under harsh conditions, including hypersaline solution of 20 wt%, high oil-content saline emulsion and humic acid/CaCl 2 mixed brine. Results demonstrated stable water vapor flux and salt rejection. By increasing the molecular weight of PEGDA monomers, a dense gel layer can be conveniently obtained, which can withstand high-concentration surfactant. This proposed IFRP method offers strong customizability, enabling the efficient production of either porous or dense hydrophilic layers to adapt to various salt solutions.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2025
·Vol. 17
·期 10
·1356
·
IF 4.9
Yumeng Guo,Qian Wang,Guoming Sun,Ying Zheng
Developing an oral fibrous barrier membrane that prevents bacterial invasion while possessing antibacterial properties and facilitating fluid decompression remains a significant clinical and scientific challenge. In this study, we developed a novel Janus membrane by modifying a polypropylene (PP) fibrous membrane with dopamine and zinc oxide nanoparticles (ZnO-NPs). Fabricated via a simple floating immersion method, this asymmetric bilayer structure consists of a hydrophobic PP layer and a hydrophilic PP/dopamine@30 nm ZnO layer, providing both antibacterial properties and enhanced fluid filtration. The mechanical properties of the PP/ZnO membrane were significantly enhanced, with an increase in the Young’s modulus and ultimate tensile strength, indicating improved strength. Antibacterial activity againstStreptococcus mutans(S. mutans) demonstrated a significant reduction in biofilm formation on the PP/dopamine@30 nm ZnO surface compared to unmodified PP. Water flux tests confirmed a stable, high filtration rate, with increased permeability under rising pressure. In vivo experiments with miniature pigs confirmed reduced bacterial presence on the sterile side of the membrane. These findings highlight the potential of the membrane for oral exudate filtration, extending filtration time and minimizing infection risks under strict sterility conditions. Further improvements in barrier properties are necessary to optimize its clinical performance.
研究领域:
生物材料学
·
医学工程
·
纳米技术
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Qiong Wang,Yihang Zhang,Guangyi Tian,Zhiguang Guo
Existing Janus fog harvesting technologies struggle to achieve efficient and continuous fog collection across various fog flow directions. In this work, we developed a Janus fog harvesting (JHL) system, characterized by a boundary-free Janus system formed by selective modification with octadecanethiol, creating a pair of hydrophilic and hydrophobic domains. The system features a 3D origami macrostructure composed of scallop arrays and shaped like an improved trumpet flower. The wettability gradient Janus system enables rapid droplet capture and ultrafast absorption. The multiple parallel and dual-asymmetric 3D Kirigami superhydrophilic channels facilitate high-speed, directional, and long-range liquid transport. These mechanisms work seamlessly together to keep both the superhydrophilic and hydrophobic surfaces dry at all times. As a result, our JHL achieves a fog harvesting efficiency as high as 0.83 g·cm–2·min–1, which is 3 times that of the original sample. Moreover, our improved trumpet-shaped 3D structure extends the Janus design concept from traditional membrane materials to spatial membrane configurations, making it suitable for omnidirectional fog harvesting in any fog flow environment.
研究领域:
材料科学
·
环境工程
·
流体动力学
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产品关联
DOI
PubMed
高影响因子
Advanced Fiber Materials
·
2024
·
IF 17.2
Yang Peng,Ju Yanshan,He Jiajun,Xia Zhengcai,Chen Liang,Tang Shaochun
Passive cooling holds tremendous potential in improving thermal comfort because of its zero energy consumption and cost-effectiveness. However, currently reported radiative cooling materials primarily focus on hydrophobic polymer films, inevitably leading to sweat accumulation and limited cooling efficiency in hot-humid environments. Herein, an advanced Janus membrane with excellent temperature–moisture management capabilities is developed, which combines radiative cooling and evaporative heat dissipation. Modification with Calcium sulfite (CaSO 3 ) nanoparticles not only enhances the optical properties (state-of-the-art solar reflectance of 96.6%, infrared emittance of 96.1%) but also improves the wettability of the polylactic acid fiber membrane. Especially 15% emittance improvement is achieved due to the strong infrared radiation ability of CaSO 3 . The membranes with opposite wettability realize the directional sweat transport (high one-way transport index of 945%). Excellent radiative cooling capability is demonstrated with sub-ambient cooling of 5.8 °C in the dry state. The Janus membranes covering sweaty skin exhibit a 46% shorter drying time and a 2 °C lower average evaporation temperature compared to cotton fabric, indicating highly efficient thermal and moisture management. This work provides an efficient route to achieving smart textiles that enable the human body to adapt to complex environmental conditions. Graphical Abstract
研究领域:
材料科学
·
纺织工程
·
生物医学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）