JOURNAL OF POROUS MATERIALS
·
2021
·Vol. 28
·期 4
·1155-1165
·
IF 2.496
Liu Sha,Chen Weiwang,Zhou Xiaomeng
Polyimide (PI) aerogels with crosslinked structure are promising for diverse applications owing to their nano-porous nature and superior properties in many aspects. However, the crosslinkers used for preparing crosslinked PI aerogels are always laboriously available and expensive. The economical melamine therefore was chosen as a substitute in this study. It was proved that the use of melamine was indeed a viable strategy for effectively crosslinking PI chains. The resultant melamine-crosslinked PI (MPI) aerogels were tested to have relatively low shrinkage (as low as 9.96 vol%), ultralight bulk densities (0.084–0.116 g cm −3 ) and low thermal conductivity (< 40.0 mW m −1 K −1 ), together with considerable thermal stability (onset temperature to decompose up to 503 ℃) and acceptable compressive strength (Young’s modulus of 1.12–10.04 MPa). Meanwhile, the morphology and properties of MPI aerogels can also be tailored by regulating the proportion of hybrid diamines as well as the polymer concentration of pristine solution. Given all of these, MPI aerogels using melamine as an economical yet effective crosslinker will have a broad prospect in many fields including thermal insulation.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
Polymer Chemistry
·
2019
·Vol. 10
·期 47
·6432-6439
·
IF 4.76
Luqi Zhu,Yan Xiao,Jiaxiao Zhang,Siqi Zheng,Meidong Lang
Polypeptides serve as a bridge between natural macromolecules and synthetic polymers, leading to the development of biocompatible and biodegradable materials with diverse and complex structures. Here, nucleobase modified polylysine (PLL-co-PTLL) was synthesized via post-polymerization modification of polylysine with thymine (T). Then, melamine (M) with three thymine-like faces was taken as a molecular chaperone analogue to drive the self-assembly of PLL-co-PTLL. It was observed that 7M–1T (M : T = 7 : 1) was the appropriate molar ratio for the pronounced self-assembly, resulting in regular and uniform fibers with an extremely high aspect ratio when the substitution degree of T was relatively low (around 27%). Furthermore, the morphological transformation from fibrous to spherical could be achieved by simply increasing the substitution degree of T. We proposed that melamine and thymine could assemble into a tetrameric structure, which enabled the accumulation of polypeptide chains in a cooperative nucleation-growth polymerization mechanism. Therefore, multiple H-bonding faces created between designable substitution polypeptides and complementary molecules would promote synergistic and hierarchical self-assembly processes.
研究领域:
生物化学
·
材料科学
·
分子生物学
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高影响因子
ANALYTICAL CHEMISTRY
·
2017
·
IF 6.32
Hao Hu,Jinyi Zhang,Yu Ding,Xinfeng Zhang,Kailai Xu,Xiandeng Hou,Peng Wu
Singlet oxygen (1O2), generated via photosensitization, has been proved to oxidize chromogenic substrates with neither H2O2 oxidation nor enzyme (horseradish peroxidase, HRP) catalysis. Of the various methods for modulation of the 1O2 generation, DNA-controlled photosensitization received great attention. Therefore, integration of the formation/deformation DNA structures with DNA-controlled photosensitization will be extremely appealing in visual biosensor developments. Here, the stable melamine-thymine complex was explored in combination with DNA-controlled photosensitization for visual detection of melamine. A T-rich single stand DNA was utilized as the recognition unit. Upon the formation of the T-M-T complex, double stand DNA was formed, which was ready for the binding of SYBR Green I and activated the photosensitization. Subsequent oxidation of TMB allowed visual detection of melamine in dairy products, with spike-recoveries ranging from 94% to 106%.
研究领域:
生物化学
·
分析化学
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DOI
PubMed
高影响因子
QUIMICA NOVA
·
2025
·
IF 0.7
Zhang Shuo,Yang Yuanrong,Meng Kun,Zhu Xinyong,Huang Longjiang,Sui Lina,Yu Liyan
To detect melamine in packaging materials, terahertz time-domain spectroscopy (THz-TDS) was employed to measure the terahertz absorption spectra of melamine-polyethylene mixtures with varying mass ratios (1:0-3). The results revealed distinct characteristic absorption peaks of melamine at 2.0, 2.28, and 2.6 THz. Among these, the peak at 2.0 THz was the most prominent and remained clearly observable even within packaging materials. Several common packaging materials, including low-density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), polyethylene terephthalate (PET), and paperboard, were examined individually to assess their spectral interference. Characteristic melamine absorption peaks at 2.0 and 2.28 THz were used to establish a calibration model based on Gaussian distribution functions. Based on the International Union of Pure and Applied Chemistry (IUPAC) method, the limit of detection (LOD) and limit of quantification (LOQ) were calculated to be 15 and 80%, respectively. Even at a concentration close to the LOD (10%), the signal remained distinguishable (signal/noise (S/N) > 3). X-ray powder diffraction (XRD) was utilized as a complementary technique to confirm the presence of melamine in the transparent plastic zip bag. These results support the effectiveness of THz-TDS in detecting melamine through packaging materials and highlight its potential application for detecting specific molecules in packaging materials.
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高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Shangjie Mou,Jiu Huang,Jing Hou,Chen Gao,Jinyin Bai,Guiyin Xu,Peng Li
Mercury pollution in water poses a serious threat to ecosystems and human health. There is an urgent need for developing effective and sustainable methods for controlling mercury contamination. In this work, modulated and easily accessed CuxS nanoclusters were introduced and anchored in situ onto the surface of a carbonized melamine sponge (C-ML) for the preparation of a porous filter. Polydopamine (PDA) was used as an interface between CuxS nanoclusters and C-ML for the robust construction. The prepared CuxS/PDA@C-ML filter displayed high extraction efficiency and selective affinity for Hg2+, and a complexation reaction was discovered during Hg2+ immobilization. The pilot-scale test conducted with 1.5 tons of Hg2+-containing wastewater (initial concentration 5.0 μg/L) for 26 days revealed that the proposed filter presented extraordinary stability with hardly any run off loss of Cu and S, and Hg2+ concentration at the outlet met the drinking water standard of the United States Environmental Protection Agency. This research potentially offers a sustainable and affordable approach for eliminating Hg2+ from wastewater and is promising for scale-up applications.
研究领域:
环境科学
·
材料科学
·
水处理
·
污染控制
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DOI
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
·
2026
·
IF 2.5
Shenfeng Yuan,Zhuoye Liao,Zhirong Chen,Qilei Zhang,Hong Yin
Surfactant-stabilized water-in-oil emulsions, characterized by small droplet sizes and high stability, pose significant challenges for separation. Traditional demulsification techniques often require external energy and suffer from poor specificity, making the development of more efficient separation methods imperative. In this work, a three-dimensional material featuring micro/nano-scale hierarchical structures and a hydrophobic coating was fabricated via the facile functionalization of a melamine sponge with dopamine, hydroxy-terminated polydimethylsiloxane, and tetraethyl orthosilicate. The resulting superhydrophobic-superoleophilic material exhibited significant compressibility, with a water contact angle of 153.7° ± 1.1° and an underoil water contact angle of 159.9° ± 1.3°. The material attained a separation efficiency of 99.99% for immiscible oil-water mixtures. Moreover, an emulsion separation device was designed to evaluate the separation efficiency of the material. Even when separating various water-in-oil emulsions with extremely small droplet sizes and an oil-to-water ratio as low as 25:1, the separation efficiency remained consistently above 99.6%. Furthermore, the material demonstrated excellent reusability, maintaining high separation performance over 14 consecutive cycles. It also maintains excellent stability in high-salinity, THF, and weakly acidic and alkaline solutions, retains structural integrity after 24 hours of UV irradiation. Thus, the developed three-dimensional superhydrophobic material provides a straightforward, viable and energy-saving strategy for effective emulsion separation.
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高影响因子
Fire-Switzerland
·
2026
·Vol. 9
·期 7
·272
·
IF 3.2
Mei Zhao,Guoqiang Dong,Xu Lu,Yajie Zhao,Jingjing Gao,Xinxin Wei,Chenhui Xu,Yu Liu,Lianqiang Li,Yachao Wang
A novel material, chitosan oligosaccharide@melamine polyphosphate (CMP), with enhanced flame-retardant and hydrophobic properties, was synthesized by cross-linking melamine polyphosphate (MPP) with chitosan oligosaccharide. Compared with MPP, the CMP overcomes its inherent drawbacks when used as a flame retardant in polylactic acid (PLA) composites, namely the high loading demand and unsatisfactory interfacial compatibility with the polymer matrix. The results demonstrated that the peak heat release rate (p-HRR) dropped significantly in comparison to pure PLA, from 304.69 kW·m−2to 210.39 kW·m−2, while the fire performance index (FPI) increased from 0.1 to 0.48 s·m−2·kW−1. Furthermore, the fire growth index (FGI) decreased from 1.51 kW·m−2·s−1to 1.03 kW·m−2·s−1. Additionally, the CMP demonstrated enhanced thermal stability, making the pyrolysis activation energy Eαincrease from 135.04 to 191.97 kJ/mol during 308~416 °C by pyrolysis kinetics. Compared to composite PLA incorporating pristine MPP, the CMP-modified counterpart exhibits superior mechanical properties and significantly enhanced hydrophobicity, evidenced by a maximum water contact angle reaching 93.96°. It provides a strategy for adapting phosphorus-based flame retardants for PLA, thereby broadening their applicability across diverse scenarios.
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高影响因子
LANGMUIR
·
2025
·
IF 3.9
Yixin Miao,Yuge Xu,Cheng Hu,Junling Liu,Zhaofeng Wu,Rong Lu,Liang Zhang,Feng Zhang
Electrode materials with a deformation capability are vital to the development of flexible supercapacitors. However, the preparation of porous carbons with a deformability remains challenging. Herein, a compressible carbon foam has been successfully prepared using a polydopamine/melamine sponge (PDA/MS) as the precursor material. The porous structure of the carbon foam was controlled by using cetyltrimethylammonium bromide and K2CO3 as template and activating agent, respectively. The resultant PDA/MS-derived carbon foam (KDMC) has a three-dimensional network architecture and exhibits excellent compressibility. The specific surface area reaches ∼2890.0 m2 g–1. Furthermore, KDMC demonstrates outstanding capacitive performance, including excellent specific capacitance (365.6 F g–1, 0.5 A g–1), good rate capability (86.6% capacitance retention from 0.5 to 10 A g–1), and outstanding cycling stability (only 1.9% capacitance loss after 10,000 cycles). To further demonstrate the practical application potential of KDMC, a symmetric supercapacitor (KDMC//KDMC) was assembled with a PVA/KOH gel electrolyte. The symmetric device achieved an energy density of 10.44 W h kg–1. This work presents a robust method to prepare compressible electrode materials for high-performance supercapacitors.
研究领域:
材料科学
·
能源存储
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DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 22
·10177-10188
·
IF 2.7
Hao Dang,Lu Wang,Yuanyou Peng,Lei Zhao,Yuan Li,Xiaoya Kang,Fen Ran
Vanadium nitride is a typical pseudocapacitive material that has attracted much attention among electrode materials as a result of its high theoretical capacity and wide voltage window. Nevertheless, its poor rate capability, cycling stability, and dissolution in alkaline electrolytes have restricted its practical applications. In this work, these problems are addressed by utilizing melamine-assisted pyrolysis and a dual-carbon composite strategy. A structurally controllable clustered shuttle vanadium-MOF is selected as the precursor. By subjecting it to high-temperature pyrolysis, melamine-derived carbon is coated on the surface of the vanadium-MOF, resulting in the formation of vanadium nitride-doped carbon electrode materials. Interestingly, they have a capacity of 407.5 F g−1 at a current density of 0.5 A g−1, with a capacity retention of 82.02% and a Coulombic efficiency of 80.59% after 10 000 cycles at a current density of 3 A g−1. When assembled into a device, the device shows a power density of 775 W kg−1 and an energy density of 39.29 W h kg−1. It is worth noting that the energy density reaches 15.82 W h kg−1 when the maximum power density of 3, 875 W kg−1 is attained. These anode materials have broad applications in energy storage systems, providing an innovative approach to developing new materials.
研究领域:
材料科学
·
电化学
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高影响因子
TALANTA
·
2018
·
IF 4.244
Qian Li,Xiao Sun,Yangkai Li,Li Xu
In this study, the hydrophobic melamine foam (HMF) was proposed as the solvent holder for liquid-liquid microextraction (LLME) purpose. The HMF contained 3D mesh structure with ultralight, compressible and hydrophobic properties. When it was used as the solvent holder, it had merits of convenient collection of the extractant phase by compressing the foam, enhanced extraction efficiency because of the large contact area between the extractant phase and sample solution, and reusability of the foam. The HMF-LLME combined with gas chromatography-mass spectrometry (GC-MS) was applied for the determination of polycyclic aromatic hydrocarbons (PAHs) in environmental water samples. Under the optimized conditions, the proposed method showed linear ranges of 0.01–50.00 ng mL −1 with good correlation coefficients (r > 0.99), low limits of detection (0.4–3.0 pg mL −1 ), and good precision with intra-day and inter-day relative standard deviations in the range of 6.1–13.7% and 5.3–15.0%, respectively. The HMF retained good performance after 10 cycles’ usages, demonstrating excellent reusability. The proposed HMF-LLME method provided comparable results with the traditional liquid-liquid extraction of PAHs based on United States Environmental Protection Agency Method 3510C on real water samples but with more operational convenience, less consumption of organic solvent and low cost. The HMF was suitable as the solvent holder for LLME purpose with accurate, convenient, rapid, eco-friendly and reusable properties.
研究领域:
分析化学
·
环境科学
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DOI
PubMed
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 411
·期 12
·2521-2530
·
IF 3.286
Su Ruifang,Zheng Hongru,Dong Shuyue,Sun Rui,Qiao Shangna,Sun Hongjing,Ma Xinyue,Zhang Tiehua,Sun Chunyan
The development of a novel method for melamine detection that uses a FAM–aptamer–G-quadruplex construct due to the efficient quenching ability of an aptamer-linked G-quadruplex is reported herein. The construct, which is labeled with the fluorescent dye 6-carboxyfluorescein (FAM), consists of two parts: a melamine-binding aptamer and a G-rich sequence that can form a G-quadruplex structure. Because of the specific recognition of melamine by the T-rich aptamer, this aptamer folds into a hairpin structure in the presence of melamine, which draws the G-quadruplex closer to the FAM fluorophore, leading to the quenching of the fluorescence of FAM. Thus, a highly sensitive and selective fluorescence strategy for assaying melamine was established. Under optimal conditions, the fluorescence quenching is proportional to the concentration of melamine within the range 10–90 nM, and the method has a detection limit of 6.32 nM. Further application of the method to plastic cup samples suggested that it permitted recoveries of between 97.15% ± 1.02 and 101.92% ± 2.07. The detected amounts of melamine spiked into the plastic cup samples and the corresponding amounts measured by HPLC were in good accordance, indicating that this fluorescent method is reliable and practical. Owing to its high sensitivity, excellent selectivity, and convenient procedure, this strategy represents a promising alternative method of melamine screening.
Graphical abstract
研究领域:
生物化学
·
分析化学
·
食品安全
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DOI
PubMed
高影响因子
ChemistrySelect
·
2022
·Vol. 7
·期 30
·e202201427
·
IF 2.307
Yani Li,Xixia Liu,Yaoyao Hou,Qin Wu,Jianjun Hou
Graphical Mel-34 is a aptamer for melamine. In this paper, we carefully studied the base-pair (A−T, G−C) function in the stem regions using label-free thiazole orange (TO) staining assay. Then, we used isothermal titration calorimetry (ITC) to verify the binding activity, and the fluorescence resonance energy transfer (FRET) biosensor based molecule-beacon was established to detect melamine in yogurt sample. Melamine is an illegal additive in milk products. Mel-34 is an aptamer specific for melamine. In this paper, we studied the base-pair function in the stem regions of Mel-34 using label-free thiazole orange (TO) staining assay. Then, we used isothermal titration calorimetry (ITC) to verify the binding activity, and the fluorescence resonance energy transfer (FRET) biosensor based molecule-beacon was established to detect melamine in yogurt sample. We found one of the mutants (mut6) has four folds higher affinity than Mel-34, which indicated its critical binding domain was G18-C25 base pair. We detected melamine in 1 % yogurt sample using mut6 as recognition molecule, the linear range was below 20 μM and the limit of detection was 4.09 μM which is below the melamine threshold (1.0 mg/kg) in milk products. This work calls for carefully study the critical binding domain to discover higher affinity aptamer specific for small molecule using label-free method.
研究领域:
分析化学
·
食品安全
·
分子生物学
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DOI
高影响因子
危险品化学品经营许可证（带存储）