SENSORS AND ACTUATORS B-CHEMICAL
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2019
·
IF 6.393
Ziwei Deng,Peihua Wen,Ni Wang,Bo Peng
Surface-enhanced Raman scattering (SERS) allows for label-free detection of analyte molecules with high sensitivity, but it is still vastly challenged for the detection of ultra-highly diluted analyte solutions in practice, e.g., femtomolar concentrates, 10 −15 M. Here, we report a facile approach for the fabrication of hierarchical superhydrophobic melamine-formaldehyde/Ag (MF/Ag) nanocomposite array substrates, applicable for ultra-highly sensitive SERS detection of biological analytes at very low concentrations up to femtomolar levels. Hierarchical superhydrophobic MF/Ag nanocomposite arrays are synthesized by integrating colloidal lithography at the air-liquid interface and in-situ interfacial reactions. These substrates can confine analyte molecules within the localized sensing regions, so as to effectively prevent the random spread of analyte molecules. In this way, these substrates are able to detect dopamine with a detection limit of 10 -15 M, and with a SERS enhancement factor (EF) as high as 3.21 × 10 10 . The substrates are durable and the SERS results are reproducible. For practical demonstration, these superhydrophobic SERS-active substrates are also applied for detecting proteins, lysozyme and hemoglobin at low concentrates. This work presents a straightforward way to synthesize the hierarchical superhydrophobic SERS-active substrates with superior sensitivity and long-term reproducibility, with rational modification, which might merit the practical SERS applications in detection of drug and pollutants in extremely dilute environments.
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高影响因子
SENSORS
·
2018
·Vol. 18
·期 5
·1595
·
IF 2.475
Guangyang Liu,Ruonan Zhang,Xiaodong Huang,Lingyun Li,Naixin Liu,Jing Wang,Donghui Xu
Various highly sensitive and selective analytical methods have been used to monitor metsulfuron-methyl residue in the environment. However, these methods involve costly instruments and complex, time-consuming operations performed in laboratories. Here, a rapid, convenient, and sensitive colorimetric sensor based on anti-aggregation of gold nanoparticles (AuNPs) is demonstrated for the rapid detection of metsulfuron-methyl in agricultural irrigation water. The AuNPs could be induced to aggregate in the presence of melamine and exhibited a distinct color change from wine-red to blue. The aggregation was suppressed by a strong hydrogen-bonding interaction between metsulfuron-methyl and melamine. The differences of the absorbance at 523 nm (ΔA523) and the color change was linearly related to metsulfuron-methyl concentration over the range 0.1–100 mg/L, as observed visually and by UV-vis (Ultraviolet-visible) spectrometry. The detection limit of the sensor was as low as 0.05 mg/L (signal/noise = 3), and was used to determine metsulfuron-methyl in spiked water and in agricultural irrigation water samples. Recoveries were in the range of 71.2–100.4%, suggesting that the colorimetric sensor was suitable for the determination of metsulfuron-methyl in agricultural water samples.Keywords:colorimetric sensor;gold nanoparticle;anti-aggregation;metsulfuron-methyl;melamine;agricultural irrigation water
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PubMed
高影响因子
Food Analytical Methods
·
2015
·Vol. 9
·期 1
·16-22
·
IF 1.956
Fan Yingming,Ma Xiaoguo,Li Zhongyang,Chen Meiqin
A sensitive and reliable method was proposed for the simultaneous detection of melamine, ammeline, ammelide, and cyanuric acid in fish and shrimp by gas chromatography–mass spectrometry after fast derivatization. The analytes were derivatized using a 99:1 mixture of N,O-bis(trimethylsilyl)trifluoroacetamide (BSTFA) and trimethylchlorosilane (TMCS) under microwave irradiation for 2 min with a power of 700 W, followed by determination with gas chromatography–mass spectrometry in selected ion monitoring mode. Conditions for extraction and derivatization of melamine and related compounds were investigated and optimized. Under the optimal experimental conditions, the limits of detection (LODs, S/N = 3) for melamine, ammeline, ammelide, and cyanuric acid were 0.006, 0.012, 0.013, and 0.010 mg kg −1 , respectively. The developed method was successfully applied to determine melamine and related compounds in fish and shrimp samples, and the spike recoveries were 82.5–103.1 % with relative standard deviations (RSDs) ( n = 3) of 0.6–4.1 %.
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高影响因子
FOOD CONTROL
·
2013
·
IF 2.738
Xianyi Cao,Fei Shen,Minwei Zhang,Jiajia Guo,Yeli Luo,Xing Li,Han Liu,Chunyan Sun,Jingbo Liu
A simple, rapid and ultra-sensitive analytical method for the determination of melamine in raw milk based on inner filter effect (IFE) of Au nanoparticles (AuNPs) on the fluorescence of CdS quantum dots (QDs) is described in this study. With the presence of citrate-stabilized AuNPs, the fluorescence of l -cysteine ( l -Cys)-capped CdS QDs was remarkably quenched by AuNPs via IFE. The fluorescence of the AuNPs-CdS QDs system was recovered upon addition of melamine, since melamine could induce the aggregation of AuNPs accompanying the reduction of their characteristic plasmon absorption at ∼522 nm, which resulted in “turn-on” of the IFE-decreased fluorescence of CdS QDs. Under the optimum conditions, a good linear correlation for detection of melamine in raw milk was exhibited from 0.05 mg·L −1 to 0.35 mg·L −1 , and the detection limit was 0.017 mg·L −1 , which was much lower than the detection limit of HPLC coupled with UV detector and the safety limit required by USA, UK and China. This method was successfully carried out for the assessment of melamine in raw milk samples, which revealed many advantages such as high sensitivity, low cost and non-time-consuming compared with traditional methods.
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高影响因子
POLYMER INTERNATIONAL
·
2015
·Vol. 64
·期 9
·1275-1288
·
IF 2.409
Zaihang Zheng,Ting Yang,Bingnan Wang,Bingbing Qu,Hongyan Wang
In this paper, a facile method is introduced to modify melamine phosphate (MP) via the sol–gel process. The aim was simultaneously to increase the water resistance of MP and improve the dispersion and compatibility of MP in acrylonitrile-butadiene-styrene copolymer (ABS). In addition, the incorporation of SiO 2 particles into the MP/dipentaerythritol (DPER) system can further ameliorate the char-forming ability and enhance the flame retardant properties of polymer composites. The chemical structure and surface morphology of SiO 2 @MP were confirmed and observed by Fourier transform infrared (FTIR) spectroscopy, SEM and TEM, respectively. The results demonstrate that ABS/SiO 2 @MP/DPER (3/1) at a loading of 30 phr reaches 31.2% limiting oxygen index and achieves a UL-94 V-0 rating. Moreover, FTIR spectra indicate that the main char-forming process of the SiO 2 @MP/DPER system occurs at 365–420 °C. A potential condensed flame retardant mechanism of SiO 2 @MP and DPER in ABS composites is proposed via the systematic analysis of char residue after combustion by FTIR spectroscopy, SEM and X-ray photoelectron spectroscopy. © 2015 Society of Chemical Industry
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高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Youshen Wu,Jiajun Liu,Jingwen Ma,Yongchun Liu,Ya Wang,Daocheng Wu
A series of fluorescent nanothermometers (FTs) was prepared with Rhodamine dye-incorporated Pluronic F-127-melamine-formaldehyde composite polymer nanoparticles (R-F127-MF NPs). The highly soluble Rhodamine dye molecules were bound with Pluronic F127 micelles and subsequently incorporated in the cross-linked MF resin NPs during high-temperature cross-link treatment. The morphology and chemical structure of R-F127-MF NPs were characterized with dynamic light scattering, electron microscopy, and Fourier-transform infrared (FTIR) spectra. Fluorescence properties and thermoresponsivities were analyzed using fluorescence spectra. R-F127-MF NPs are found to be monodispersed, presenting a size range of 88–105 nm, and have bright fluorescence and high stability in severe treatments such as autoclave sterilization and lyophilization. By simultaneously incorporating Rhodamine B and Rhodamine 110 (as reference) dyes at a doping ratio of 1:400 in the NPs, ratiometric FTs with a high sensibility of 7.6%·°C–1 and a wide temperature sensing range from −20 to 110 °C were obtained. The FTs exhibit good stability in solutions with varied pH, ionic strengths, and viscosities and have similar working curves in both intracellular and extracellular environments. Cellular temperature variations in Hela cells during microwave exposure were successfully monitored using the FTs, indicating their considerable potential applications in the biomedical field.
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高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Qin Wang,Yu-long Liu,Zi-jie Huang,Zi-cheng Tang,De-xiang Sun,Jing-hui Yang,Xiao-dong Qi,Yong Wang
The high viscosity and low fluidity of crude oil impede its adsorption by porous sorbents, making the effective cleanup of crude oil a significant challenge. Herein, inspired by the nano-structure of moth eyes, we developed a hierarchical adsorbent material via electrochemically polymerizing polypyrrole nanowire arrays (PPy NWAs) onto melamine foam (MF), where 1D ordered PPy NWAs were vertically grown on the 3D MF skeleton. The aligned PPy NWAs enhanced hydrophobicity (water contact angle of 151.0°) and served as numerous capillary tubes, thereby achieving 81.0 g g−1 oil adsorption. Due to the continuous PPy network, the MF@PPy foams exhibited a remarkable light-trapping effect with a high light absorption ratio of 98.8% and good electrical conductivity of 201 S m−1. The surface temperature could quickly reach 85.5 °C under simulated illumination (1 sun) and 88.1 °C with a power input (2 V). Interestingly, the photothermal and superhydrophobic effects induced Marangoni flow, leading to controllable light-driven motion. Furthermore, the MF@PPy foams could be remotely operated, allowing for the sustained removal of crude oil from water surfaces via light-activated and pump-assisted systems. This work provides new insights for developing oil adsorption materials by constructing moth-eye structured PPy NWAs, demonstrating great potential for all-weather crude oil adsorption.
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SURFACE & COATINGS TECHNOLOGY
·
2024
·
IF 5.3
Xin Li,Xin Gao,Jun Liu,Junhui Dong,Yubo Wang,Jie Chen,Changzhen Zhan,Yue Yin,Ding Nan
In recent years carbon materials, such as graphene oxide (GO) and carbon nanotube, have been became key materials for high-performance coatings for the protection of metals from corrosion. Here, a novel bi-functional epoxy coating was developed and formulated, which can replace traditional primers and topcoats. Furthermore, the effects of modified graphene oxide‑carbon black (MGC) on the corrosion resistance and weathering resistance of coated Q235 samples have been investigated using salt spray testing, UV accelerated aging testing, and electrochemical impedance spectroscopy. Results suggest that the incorporation of MGC leads to a considerable enhancement in the corrosion resistance and weathering resistance of coated samples. Notably, the bi-functional epoxy coating formulated with 0.2 wt% of MGC demonstrated the most effective anti-corrosion and weathering resistant properties. During the UV accelerated aging testing for 20 days, the low-frequency impedance modulus values of bi-functional epoxy coated samples were recorded to be 1.09 × 10 8 Ω·cm 2 , which is higher than pure epoxy coated samples (9.05 × 10 6 Ω·cm 2 ). Also, the highest adhesion strength of bi-functional epoxy coated samples decreased from 2.51 MPa to 1.97 MPa. These observations suggest that the bi-functional epoxy maintained a significant portion of its adhesion strength even after undergoing UV accelerated aging, indicating its robustness and durability under such corrosion conditions.
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JOURNAL OF HAZARDOUS MATERIALS
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2012
·
IF 4.173
Wang Zhang,Ling-Guang Qiu,Yu-Peng Yuan,An-Jian Xie,Yu-Hua Shen,Jun-Fa Zhu
Covalent organic frameworks (COFs) are a new generation of porous materials constructed from light elements linked by strong covalent bonds. Herein we present rapid preparation of highly fluorescent nanoparticles of a new type of COF, i.e. melamine-based porous polymeric network SNW-1, by a microwave-assisted synthesis route. Although the synthesis of SNW-1 has to be carried out at 180 °C for 3 d under conventional reflux conditions, SNW-1 nanoparticles could be obtained in 6 h by using such a microwave-assisted method. The results obtained have clearly demonstrated that microwave-assisted synthesis is a simple yet highly efficient approach to nanoscale COFs or other porous polymeric materials. Remarkably, the as-synthesized SNW-1 nanoparticles exhibit extremely high sensitivity and selectivity, as well as fast response to nitroaromatic explosives such as 2,4,6-trinitrotoluene (TNT), 2,4,6-trinitrophenylmethylnitramine (Tetryl) and picric acid (PA) without interference by common organic solvents, which is due to the nanoscaled size and unique hierarchical porosity of such fluorescence-based sensing material.
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高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 8
·2909-2917
·
IF 4.58
Han Caiqin,Li Yuqi,Jia Qin,Bradley Layne Hyer,Gan Yun,Yao Yue,Qu Lulu,Li Haitao,Zhao Yiping
An on-demand, disposable and portable surface-enhanced Raman scattering (SERS) array has been prepared by modifying the surface of cellulose paper and patterning it with silver nanoparticles (AgNPs) via pen-writing technique. The paper is initially modified with hexadecenyl succinic anhydride to generate a hydrophobic top layer that is capable of concentrating melamine (and other hydrophobic analytes) by preventing the mainly aqueous sample from spreading on the paper. The AgNPs are subsequently written onto the hydrophobic paper with a high degree of control to form large-scale SERS sensing arrays. The resulting arrays demonstrate outstanding Raman scattering enhancement as demonstrated for the fluorescent dye Rhodamine 6G which can be detected by SERS with an 80 pM limit of detection (LOD) without interference by fluorescence. The reproducibility in the preparation of spots has a relative standard deviation of <15% (for n = 128 spectra). The arrays were applied to the determination of the illicit milk additive melamine. The plot of SERS intensity at Δν = 681 cm −1 versus the logarithm of melamine concentration is linear in the concentration range from 0.3 to 20 mg·L −1 , and the LOD is 0.27 mg·L −1 . In our perception, the disposable arrays presented here integrate the advantages of easy production and reliable reproducibility, and therefore are an ideal choice for use in SERS detection.
An on-demand, disposable and portable surface-enhanced Raman scattering (SERS) array has been developed by pen writing. Such a SERS array can be applied for the highly sensitive determination of the illicit milk additive melamine, which holds great promise for field-deployable applications.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Feng Li,Luan Jishuang,Zhang Wenjuan,He Yangfan,Wang Lulu,Mi Guangxin,Qv Dehu,Chu Qian-Qian,Han Fei,Cheng Bo
Phase change materials (PCMs) can efficiently absorb and release energy while keeping the temperature constant, and thus exhibiting great potential in thermal management applications. However, issues such as liquid phase leakage and poor thermal conductivity of PCMs, particularly prominent in organic ones, have limited their practical application. In this work, we employed polyethylene glycol (PEG) with the phase change temperature of 61.72 °C as PCMs. A poly(phenol-amine) was synthesized via the Schiff base reactions or Michael-type additions using low-cost Catechol and Diethylenetriamine, and was applied to modify the surface of melamine foam (MF). The abundant polar groups and aromatic rings in the poly(phenol-amine) enable strong interactions with both MF and PEG. Additionally, MXene was incorporated to further improve the thermal conductivity of the composite phase change materials (CPCMs). The results demonstrated that the modified MF/MXene/PEG based CPCMs showed negligible leakage when tested at 80 °C for 1 h. They also exhibited an enhanced thermal conductivity of 0.55 ± 0.01 W/m·K with an enthalpy value of 186.4 J/g. Moreover, after 100th thermal cycling and reprocessing, the crystallization behavior and phase transition capability of the CPCMs remained almost unchanged. Furthermore, the introduction of MXene markedly enhanced CPCMs’ light absorption efficiency. These findings indicate that the prepared CPCMs, with their excellent thermal performance, hold substantial potential in energy storage and thermal management applications. Graphical
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2025
·
IF 5.7
Yuan Zhang,Yongtao Tan,Fengwei Tuo,Haorui Liu,Ning Mi,Jiantie Xu
Vanadium nitride (VN) has attracted significant attention as a promising electrode material for supercapacitors mainly owing to its high theoretical specific capacitance and broad electrochemical stability window. However, poor cycling stability caused by dissolution in alkaline electrolyte largely restricts its practical applications. Herein, a series of heterojunction Fe 3 C/VN/C- x composites were synthesized via a one-step pyrolysis strategy for pyrolysis mixture of iron-vanadium precursor and melamine at 700 °C for 2 h. Among the series, the optimized Fe 3 C/VN/C-2 exhibits a high specific capacitance of 291.2 F g -1 at 0.5 A g -1 , which is 2.7 times higher than pristine VN with 108.3 F g -1 . Moreover, the Fe 3 C/VN/C-2 enables asymmetric supercapacitor device (Ni(OH) 2 ||Fe 3 C/VN/C-2) achieving a high energy density of 14.9 Wh kg -1 with high power density of 400.1 W kg -1 and a high power density of 3998.6 W kg -1 with an energy density of 6.2 Wh kg -1 , and retaining 92.7 % of its initial capacitance after 10,000 cycles (17.2 F g -1 ). The enhanced electrochemical performance of Fe 3 C/VN/C-2 is attributed to the synergistic effect of the heterojunction and carbon matrix, which suppress vanadium dissolution and accelerate charge transfer kinetics.
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高影响因子
危险品化学品经营许可证（带存储）