APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Chenghao Zhang,Chun Li,Zongjing He,Dejun Gao,Junlei Qi,Jian Cao
Multi-level hierarchical surface roughness is the key to natural superhydrophobic materials. In this work, rough surfaces of a novel superhydrophobic material are achieved by the reactive wetting technique. The molten AgCuTi alloy is applied to infiltrate into the porous anodic aluminum oxide (AAO) membrane, and wetting of molten AgCuTi is promoted by the reaction layer formed at the interface between AAO and AgCuTi. The AgCuTi infiltrates the AAO nanopores and forms the first-level surface roughness based on reactive wetting. To release the nanostructures embedded in the AAO pores, hydrothermal etching with NaOH aqueous solution was used to remove AAO. Meanwhile, TiO 2 nanostructures are synthesized under hydrothermal conditions, resulting in the second-level surface roughness. After modification, the surface is found to exhibit excellent superhydrophobic properties, including a high water contact angle (WCA) and low roll-off angle (RA). The superhydrophobic surface also shows self-cleaning, mechanical durability and long-term stability. The as-prepared surface exhibits excellent repellence for water solutions with different pH values. This method could be applied to fabricate superhydrophobic surfaces on different kinds of materials, showing broad application prospects.
研究领域:
材料科学
·
表面工程
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产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 13
·135501
·
IF 3.953
Jun Dong,Yan Wang,Qianying Wang,Yi Cao,Qingyan Han,Wei Gao,Yongkai Wang,Jianxia Qi,Mengtao Sun
Surface-enhanced Raman scattering (SERS) is recognized as one of the most favored techniques for enhancing Raman signals. The morphology of the SERS substrate profoundly affects molecular Raman spectra. This study aimed to construct a ring-mounted nanostructured substrate via liquid–liquid two-phase self-assembly incorporated with anodic aluminum oxide (AAO) membrane transfer techniques. High-density nanoparticles (NPs) assembled on AAO membranes were ascribed to reduce the diameters of the nanopores, with Au–Ag alloy NPs to regulate the dielectric constant so as to reveal the local surface plasmon resonance tunability. SERS engineered in this way allowed for the fabrication of a ring-mounted nanostructured substrate where the distribution density of NPs and dielectric constant could be independently fine-tuned. High SERS activity of the substrate was revealed by detecting the enhanced factor of crystal violet and rhodamine 6G molecules, which was up to 1.56 × 106. Moreover, SERS of thiram target molecules confirmed the supersensitivity and repeatability of the substrate as a practical application. The results of this study manifested a low-cost but high-efficiency ring-mounted nanostructured SERS substrate that might be suitable in many fields, including biosensing, medical research, environmental monitoring, and optoelectronics.
研究领域:
材料科学
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光学
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生物传感
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环境监测
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 17
·7571-7577
·
IF 3.591
Nan Li,Siqingaowa Han,Shuang Lin,Xuan-yu Sha,Wuliji Hasi
In the process of preparing a solid surface-enhanced Raman scattering (SERS) substrate, there is a need to devise a simple and efficient method that will ensure an even distribution of nanoparticles (NPs) on the surface of the solid substrate. In this study, silver NP (Ag NP) colloids, with different particle sizes, were prepared by adjusting the pH value, and anodized aluminium oxide (AAO) was used as a template to assemble Ag NPs into AAO holes using interface self-assembly technology. Due to the limiting effect of the AAO template, the distribution of Ag NPs on the substrate was uniform. With 4-mercaptobenzoic acid (4-MBA) as a probe, the sensitivity of this SERS substrate was evaluated, with an analysis enhancement factor (AEF) of up to 1.17 × 106. In addition, the signal repeatability of this SERS substrate was excellent, with a relative standard deviation (RSD) of 6.45%, and the SERS signal was basically consistent within a period of 30 days. Furthermore, the SERS identification of levofloxacin in milk was demonstrated, with a minimum detection limit of 1.88 × 10−6 M. Additionally, within the concentration range of 1 × 10−6 to 2 × 10−5 M, the levofloxacin concentration had a linear relationship with its SERS intensity, with a linear correlation coefficient as high as 0.986. The recovery rate was estimated to be between 97.61% and 107.58%, indicating the reliability of this SERS method. This simple and rapid approach is expected to be applied for the on-site measurement of antibiotics in food.
研究领域:
分析化学
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食品安全检测
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产品关联
DOI
高影响因子
Nanoscale
·
2016
·Vol. 8
·期 11
·5920-5927
·
IF 7.76
Chaofan Sui,Kaige Wang,Shuang Wang,Junying Ren,Xiaohong Bai,Jintao Bai
Most of SERS applications are constricted by heterogeneous hotspots and aggregates of nanostructure, which result in low sensitivity and poor reproducibility of characteristic signals. This work intends to introduce SERS properties of a type of SERS-active substrate, Au-CuCl2-AAO, which is innovatively developed on a porous anodic alumina oxide (AAO) template. Spectral measuring results of Rhodamine 6G (R6G) on this substrate optimized by controlling morphology and gold thickness showed that enhancement factor (2.30 × 107) and detection limit (10−10 M) were both improved and represented better performance than its template AAO. Homogenous hot spots across the region of interest were achieved by scanning SERS intensity distribution for the band at 1505 cm−1 in 5 × 5 μm2 area. Furthermore, the promising SERS activity of the flower-patterned substrate was theoretically explained through simulation of the electromagnetic field distribution. In addition, this SERS substrate is proposed for applications within the field of chemical and biochemical analyses.
研究领域:
材料科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Rongzhe Nie,Chengfu Zhong,Qimin Yuan,Yu Dai,Fan Xia,Xiaojin Zhang
Osmotic energy from salinity gradients is a promising sustainable and clean energy source. Traditional nanofluidic membranes used for salinity gradient energy conversion face an intrinsic compromise between structural stability (achieved by intra-channel confinement) and low resistance (requiring extra-channel ion acceleration). Here, we propose a hybrid (FEH@AAO) membrane with fully encapsulated hydrogel (FEH) onto porous anodic aluminum oxide (AAO) nanochannels that integrates rigid nanochannel confinement with an external hydrogel ion diffusion network. The hydrogel grows continuously inside and outside AAO nanochannels, while inhibiting swelling deformation (enhancing mechanical robustness) and reducing mass transfer resistance (acting as an “ion accelerator”). Under a 50-fold NaCl gradient, FEH@AAO membrane achieves a power density of 8.84 W/m 2 , which is 28 % higher than traditional designs. The internal resistance has decreased by 35 %. In a natural seawater/river water mixture, it maintains ∼90 % power output over 7 days, outperforming most reported membranes. This work presents a structural optimization strategy that, by optimizing mass transfer outside nanochannels, achieves low ion transport resistance and exceptional long-term structural integrity for osmotic energy conversion.
研究领域:
纳米流体力学
·
能源材料
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膜科学与技术
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环境能源工程
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电化学能量转换
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Mengyuan Chen,Chong Wang,Jing Tan,Jin Wang,Chen Wang
Nanofluidic membranes hold great prospects in sensitive and rapid detection of bioanalysts, while remaining lacking robust and general approaches for specificity. In this work, we introduce a cell membrane-inspired nanofluidic membrane with excellent ion current rectification properties as a simple and robust platform for label-free and ultrasensitive biosensing. The asymmetric nanofluidic membrane is prepared by coupling a two-dimensional covalent organic framework (COF) membrane to an anodic aluminum oxide (AAO) nanochannel via hydrogen bonding. The prepared COF/AAO membrane presents selective ion transport due to the asymmetric structure and anion selectivity of COF. With the large surface area and abundant functional modification sites of COF, further grafting of the recognition unit can be easily achieved to mimic the recognition process of receptors and ligands on cell membranes. As a proof of concept, the application in bacterial detection is demonstrated by covalently bonded Concanavalin A as recognition units. The highly amplified ionic current based on ion current rectification properties of the COF/AAO membrane allows sensitive and selective bioanalysis. Specifically, the proposed asymmetric nanofluidic membrane presents a linear detection range from 10 to 10 6 CFU/mL with an ultralow detection limit of 7 CFU/mL for E. coli . This work reveals the great potential of COF/AAO hybrid nanofluidic membrane as a sensor for rapid and precise bioanalysis.
研究领域:
生物传感器
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材料科学
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微生物学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Xin Huang,Zengshuai Zhang,Xueli Ren,Peng Gu,Kunlun Yang,Jianglei Xiong,Hengfeng Miao
Carbon sources as a substrate can provide organic matter for denitrification and nitrification, facilitating the removal of pollutants. However, low-cost and efficient alternative carbon sources are an urgent problem to be solved for wastewater treatment processes globally. Isopropyl alcohol (IPA), as a waste liquid produced during the cleaning process in the electronics industry, can serve as the carbon source for microbial growth . Herein, the influence of conventional carbon sources (glucose-coupled sodium acetate) and IPA carbon source on denitrification performance, metabolite identification, microbial community composition, and disinfection by-product (DBP) formation was assessed by a denitrification system (AAO-MBR). Results showed that the nitrogen removal efficiency of IPA as a carbon source (69.2 %) was similar to that of conventional carbon sources (72.6 %). Notably, the results of the metabolites of the two carbon source effluents showed that CHO and CHNO compound classes were the most abundant species in terms of quantity, and lignin (59.5–60.1 %) was the main component in two carbon source effluents. Additionally, the diversity of microbial communities at the genus level was significantly different, but organic matter degraded bacteria (i.e., Defluviicoccus and Rhizobacter ) and denitrifying functional bacteria (i.e., Dinghuibacter and Amaricoccus ) were dominant microorganism when using IPA and conventional carbon sources. Interestingly, the effluent dissolved organic matter (DOM) exhibited a lower susceptibility to transformation into DBP with an IPA carbon source, thus ensuring the safety of reused water. The findings provide valuable insights into utilizing wasted IPA as an effective carbon source in the wastewater treatment process.
研究领域:
环境工程
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微生物学
·
水处理
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产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2026
·
IF 6
Qiuyan Luo,Wenhui Zhang,Yuan Mao,Wenfu Li,Qizi Wu,Xuyan Guo,Shuaiwei Wei,Guixiang Wang,Fuqiu Ma,Boris Krit
This study presents a facile one-pot hydrothermal strategy for the in-situ growth of a layered double hydroxide and ZIF-8 composite coating on anodic aluminum oxide. The synthesis temperature was optimized within the range of 110–130 °C, which enables the synchronous formation of a uniform and well-interlocked LDH/ZIF-8 microstructure. Subsequent modification with stearic acid (SA) effectively imparts hydrophobicity to the coating, yielding a water contact angle of 136.4 ± 0.10°. The obtained LDH/ZIF-8@SA coating exhibits remarkable anti-icing performance, delaying ice nucleation and complete freezing of a water droplet at -15 °C by 93% and 45%, respectively, compared to the bare AAO substrate. Electrochemical tests demonstrate excellent corrosion resistance, with the SA-modified coating showing a corrosion current density of 1.413 × 10 -9 A·cm -2 after 3 days of immersion, and a charge-transfer resistance up to 1.362 × 10 8 Ω·cm 2 after 14 days of immersion in 3.5 wt.% NaCl solution. Moreover, the coating possesses a low friction coefficient of 0.318 ± 0.045. Density functional theory calculations were performed to elucidate the interfacial bonding mechanism among ZIF-8, SA and LDH.
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 36
·2302427
·
IF 19
Mengyuan Chen,Kun Yang,Jin Wang,Hanjun Sun,Xing-Hua Xia,Chen Wang
Facing the energy crisis, using the salinity gradient between seawater and freshwater for osmotic energy conversion is a direct way to obtain energy. So far, most nanofluidic membranes utilized for osmotic energy generation are cation-selective. Given that both anion- and cation-selective membranes have the identical importance for energy conversion devices, it is of great significance to develop anion-selective membranes. Herein, an anion-selective membrane is synthesized by in situ growth of imine-bridged covalent organic framework (COF) on ordered anodic aluminum oxide (AAO) at room temperature. The imine groups and residual amino groups of COF can combine with protons in neutral solution, enabling the COF positively charged and efficiently transport of anions. Particularly, due to the asymmetry in the charge and structure of COF/AAO, the as-prepared membrane exhibits excellent ionic current rectification property, which can inhibit ion concentration polarization effectively and possess high ion selectivity and permeability. Using the present COF/AAO membrane, salinity gradient energy can be successfully harvested from solutions with high salt content, and the output power density reached 17.95W m −2 under a 500-fold salinity gradient. The study provides a new avenue for construction and application of anion-selective membranes in the smart ion transport and efficient energy conversion.
研究领域:
材料科学
·
纳米流体学
·
能源转换
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产品关联
DOI
高影响因子
MATERIALS CHARACTERIZATION
·
2020
·
IF 3.562
Zhi-Chao Meng,Li-Yin Gao,Zhi-Quan Liu
Electrodeposition of Sn within porous anodic aluminum oxide (AAO) template was used to synthesize Sn nanowires. Ag seed layer was sputtered upon AAO template firstly, then the Sn nanowires were electroplated upon the seed layer. After electrodeposition the Ag seed layer was removed and the AAO template was dissolved in order to obtain Sn nanowires finally. The diameter of Sn nanowires was about 200 nm, being consistent with the template pore size, while the length of nanowires had a linear growth rate of approximately 2.49 μm/min. X-ray diffraction (XRD) and electron diffraction revealed that individual Sn nanowire was single crystal without preferential growth direction. The surface of the nanowire was wrapped by a thin SnO film (~5 nm thick), as verified by transmission electron microscopy (TEM) observation and X-ray photoelectron spectrometer (XPS) analyses. The synthesized Sn nanowire powders had a dark brown color, which comes from the surface SnO layer. Through the differential scanning calorimetry (DSC) analysis, the melting point of Sn nanowires was determined as 231.73 °C, which is about 2.7% lower than the pure Sn particles. Fabrication of Sn nanosolders from Sn nanowires was tried using liquid bath melting method. It was found that Sn nanowires could convert into spheroidal nanosolder in liquid paraffin, which demonstrated a novel technology to fabricate nanosolders used for nanoscale interconnections.
研究领域:
材料科学
·
纳米技术
·
电化学
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产品关联
DOI
高影响因子
TALANTA
·
2025
·
IF 6.1
Terefe Tafese Bezuneh,Fuchun Nan,Xin Li,Tongtong Kou,Zilong Wu,Fangfang Lang,William W. Yu
Designing highly sensitive method for the analysis of α-glucosidase activity is of critical value for diagnosis and therapy of diabetes. Here, we employed self-assembly of guanosine 5′-monophosphate nucleotide (GMP) with metal ions (Cu 2+ and Tb 3+ ) to prepare multifunctional Tb-CuGMP NPs. Owing to Cu 2+ -catalytic center, the as-prepared Tb-CuGMP NPs exhibits ascorbic acid oxidase (AAO)-like and peroxidase (POD)-like self-cascading catalytic activity. The AAO-POD cascade system can catalyze the oxidation of AA into dehydroascorbic acid (DHAA) with the generation of H 2 O 2 , which serves as a substrate for POD-like activity and catalyzed into • OH radicals. Based on these enzymatic reactions, a unique colorimetric detection approach in which nanozyme/TMB/AA produced oxidized TMB with characteristic blue color and DHAA sensitized Tb 3+ to turn-on the fluorescence of the detection system was proposed. Furthermore, enzymatic hydrolysis of 2-O-a-D-glucopyranosyl-L-ascorbic acid (AA2G) into AA was coupled with AAO-POD cascade system to realize highly sensitive detection of α-glucosidase activities. Interestingly, the as-constructed dual-mode assay reduces the LOD of α-glucosidase to 5.1 × 10 −4 U/mL. To sum up, this work provides new horizon for the development of efficient multifunctional nanomaterial with integration of biocatalysis and bioassay into a single material.
研究领域:
纳米技术
·
酶活性分析
·
生物传感
·
生物检测
·
催化
·
糖尿病诊断
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2023
·
IF 3.1
Xin-Xin Dong,Tao-Li Chen,Xiangjuan Kong,Shuang Wu,Fang-Fang Kong,Qiang Xiao
In this work, a facile fluorescence Eu3+-based metal organic frameworks (Eu MOF) sensor for ascorbic acid (AA) and ascorbate oxidase (AAO) detection was developed. The fluorescence of Eu MOF could be effectively quenched by Ce3+ but not Ce4+ at an appropriate concentration, thus, when the reductant AA was added into the solution containing Ce4+, Ce4+ was chemically reduced to Ce3+, which induced the decreased fluorescence signal of Eu MOF. However, when AAO was introduced, AA was effectively oxidized to dehydroascorbic acid (DHAA) under the catalysis of AAO, thus, Ce4+ could not be reduced, resulting in the fluorescence restore of Eu MOF. Hence, the concentration of AA and AAO could be determined by the fluorescence decrease and restore of Eu MOF. The fluorescent platform showed high sensitivity with the limit of detection of 0.32 µM for AA and 1.18 U/L for AAO, respectively. Moreover, the proposed method was successfully applied for AA and AAO determination in real samples, indicating great potential for biomedical application in complex matrices.
研究领域:
分析化学
·
生物医学工程
·
材料科学
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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）