CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Xue Liu,Jianguo Deng,Yingchun Lu,Xin Li,Fuhan Mai,Lanxiang Ji,Xiaofeng Bai
This study focused on radiation shielding materials for nuclear applications, employing a vacuum-assisted impregnation method to optimise the microstructure and establish a synergistic shielding mechanism combining scattering and absorption. Specifically, melamine sponge (MS) is first modified using KH550 to form –NH 2 active sites on its pore surfaces. Subsequently, it is immersed in a composite solution to construct “reflective capsules”. Finally, gradient encapsulation is performed using polyborosiloxane and polyurethane. The results show that compared with pure MS, the tensile strength of this material doubles, the elongation increases by 179 %, and its shielding capabilities against 59.6 keV γ-rays and 0.025 keV thermal neutrons increase by 1442 % and 1593 % respectively, reaching 27.14 % and 43.35 %. Additionally, it has a photothermal peak temperature of 78.5 °C and stable thermal response. Furthermore, relying on the three-dimensional elastic network of the MS and the conductive pathway of MXene, the material achieves a piezoresistive coefficient of 5.27 kPa −1 , demonstrating potential for application as a pressure-sensitive sensor. Through microstructure design and functional integration, this work makes the material suitable for complex scenarios such as nuclear facility maintenance and emergency rescue.
研究领域:
核医学
·
生物材料学
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放射防护
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功能材料
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纳米复合材料
·
传感器材料
✓ 已验证
产品关联
DOI
高影响因子
Chemistry-An Asian Journal
·
2014
·Vol. 9
·期 12
·3440-3450
·
IF 3.935
Pengyao Xing,Xiaoxiao Chu,Mingfang Ma,Shangyang Li,Aiyou Hao
Self-assembly of N -fluorenyl-9-methoxycarbonyl glutamic acid (Fmoc-Glu) in water generates metastable single-wall nanotubes. These nanotubes entangle and bundle together to form unstable gels that shrink with time and finally result in lamellar crystalline precipitates. Melamine (Mm) was employed as a supramolecular modifier and stabilizer to improve the stability of the nanotubes. Mm interacts with the carboxyl-rich surfaces of the nanotubes via H-bonds and static electronic forces to diminish the high affinity of individual nanotubes and facilitate Fmoc-Glu supergelation (critical gelation concentration <0.1 wt %). Although the basic process of nanotube formation is not disturbed, Mm inverts the supramolecular helicity of nanotubes from P to M .
研究领域:
超分子化学
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纳米材料
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软物质
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自组装
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高分子科学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2026
·
IF 5.2
Xin Yang,Yu-Hua Huang,Qiangsheng Zhang,Xu-Dong Wang,Dai-Bin Kuang
Low-dimensional halide perovskitoids exhibit emerging potential in photodetection owing to their exceptional environmental stability and ultralow dark current. However, their extended inorganic interlayer spacing and weak inter-ligand interactions fundamentally limit their carrier transport efficiency and photodetector performance. In this study, we address the above challenges through melamine (MLA) cation engineering, constructing two isostructural Bi-/Pb-based single crystals [(MLA)2Bi2I10.8H2O (Bi-SC) and (MLA)2PbI6.2H2O (Pb-SC)]. Benefiting from the extensive hydrogen bonds formed by the abundant -NH₂/-NH- terminal groups of MLA2+ and water molecules in Bi-SC, as well as the shorter octahedral I···I distances (3.83 Å vs. 4.30 Å, a 11% reduction) from Bi3+ substitution, enabling lower defect density (4.30 × 109 vs. 3.84 × 1010 cm−3) and higher carrier mobility (4.17 × 10−2 vs. 3.29 × 10−4 cm2 s−1 V−1) than Pb-SC. As a result, the Bi-SC based photodetector demonstrates an on/off ratio 15 times higher than that of Pb-SC. Mechanism analysis reveals that water-bridged hydrogen bonding network simultaneously compresses the inorganic lattice, enhances the stacking arrangement of MLA2+ ligands and thus strengthens charge transfer pathways. The hydrogen-bond engineering overcomes the inherent dimensionality limits in hybrid materials, establishing a general design principle for high-performance low-dimensional optoelectronic applications.
✓ 已验证
DOI
PubMed
高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·4490-4490
·
IF 4.259
Xiaojuan Liu,Mengmeng Song,Feng Li
Melamine detection has attracted much attention since the discovery of the damage of melamine to human health. Herein, we have developed a sensitive homogeneous electroanalytical platform for melamine detection, which is relied on the formation of triplex molecular beacon integrated with exonuclease III (Exo III)-mediated signal amplification. The formation of triplex molecular beacon was triggered by the recognition and incorporation of melamine to the abasic (AP) site contained in the triplex stem. The stem of the triplex molecular beacon was designed to have a protruding double-strand DNA, which can be recognized and hydrolyzed by Exo III for releasing methylene blue (MB)-labeled mononucleotide. These released MB molecules exhibit high diffusivity toward indium tin oxide electrode with negative charge, thus producing a significantly increased electrochemical response. Taking advantages of the high binding affinity of the DNA triplex structure containing AP sites towards melamine and the unique features of Exo III, this sensing platform is capable for sensitive and selective melamine assay with a detection limit as low as 8.7 nM. Furthermore, this strategy shows good applicability for melamine assay in real samples. Therefore, this strategy broadens the application of triplex DNA and presents a new method for sensitive detection of melamine.
研究领域:
分析化学
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生物传感
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食品安全
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Yongfei Zhu,Yonggang Du,Junming Su,Yanchao Mo,Shujuan Yu,Zhi Wang
Oil/water separation through superhydrophobic sponges is an important method for oily wastewater and organic solvents pollution treatments, and developing a simple and eco-friendly approach to fabricate superhydrophobic sponge is still very urgent and valuable. In this work, Fe 3 O 4 and bio-benzoxazine based on cardanol and long-chain aliphatic amine were successively loaded on melamine sponge (MS) through a simple dip-coating method, which was thermally cured to obtain superhydrophobic MS. The as-prepared superhydrophobic MS (P15C-O/Fe 3 O 4 /MS) not only exhibited high oil absorption capacity from 65.8 to 136.2 times its own weight for various oils and organic solvents, but also showed excellent recyclability with a water contact angle (WCA) of about 149° after 50 absorbing-squeezing cycles and an absorption retention of more than 92% after 100 cycles. Moreover, P15C-O/Fe 3 O 4 /MS also possessed outstanding chemical stability, whose WCA almost kept unchanged after touching with strong acid (pH = 1) and alkali (pH = 13) as well as NaCl solutions for 48 h. The outstanding recyclability and stability of P15C-O/Fe 3 O 4 /MS were from the stability of polybenzoxazine and strong adhesion between the coating and sponge, due to the formation of coordination interactions between Fe 3+ and N, O atoms as well as hydrogen bonds between polybenzoxazine and sponge. In addition, P15C-O/Fe 3 O 4 /MS could be used for continuous oil-water separation and driven remotely by a magnetic force. These advantages make P15C-O/Fe 3 O 4 /MS a potential candidate for large-area oil-spill cleanup and oily wastewater treatment, especially under some dangerous conditions.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2019
·Vol. 30
·期 31
·315601
·
IF 3.399
Shiping Sun,Erchuang Fan,Hongliang Xu,Wenbo Cao,Gang Shao,Bingbing Fan,Hailong Wang,Rui Zhang
Modified g-C3N4 samples (g-X, where X corresponds to the number of hours of acid treatment of the melamine) with outstanding photocatalytic performance were prepared by using hydrochloric acid-treated melamine as a precursor and calcining at 550 °C for 2 h. An x-ray diffractometer, field-emission scanning electron microscope, infrared spectrometer, N2 adsorption–desorption test, x-ray photoelectron spectroscopy, and ultraviolet–visible diffuse–reflectance spectroscopy analysis were carried out to characterize the phase composition, microstructure, chemical structure, specific surface area (SSA), chemical states, elemental composition and optical properties of the samples, respectively. The photocatalytic performance of the samples was evaluated by degrading the Rhodamine B (RhB) aqueous solution. The results showed that the crystal structure and vibration bands of melamine changed due to the reaction with hydrochloric acid. The crystallinity and grain size of g-C3N4 in g-X (X = 1, 2, 4, 6, 8, 10) reduced, and the SSA values of g-X increased compared to that of the g-0 sample, which was synthesized from pristine melamine. The g-X samples exhibited excellent photocatalytic activity towards degradation of RhB compared to g-0. The photocatalytic activity of the g-X samples increased gradually as the acid treatment time of the melamine increased from 1 h to 2 h, and then decreased gradually with the extension of the acid treatment time. The rate constant (k) values of g-X are higher than that of g-0. g-2 presented the highest rate constant (k = 0.052 min−1), which was 5.5 times higher than that of g-0. The improved photocatalytic activity of the g-X samples was attributed to the higher SSA value, the appearance of surface defects, the outstanding photo-carrier separation efficiency and stronger light harvesting ability of g-X, with the last two factors being more significant. Acid treatment of melamine is helpful in the preparation of high performance g-C3N4 photocatalyst, and the microstructure and photocatalytic performance of g-C3N4 were affected significantly by the acid treatment time.
研究领域:
材料科学
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化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
Journal of Spectroscopy
·
2016
·
IF 0.814
Tong Wu,Hui Chen,Zan Lin,Chao Tan
Melamine is a nitrogen-rich substance and has been illegally used to increase the apparent protein content in food products such as milk. Therefore, it is imperative to develop sensitive and reliable analytical methods to determine melamine in human foods. Current analytical methods for melamine are mainly chromatography-based methods, which are time-consuming and expensive and require complex pretreatment and well-trained technicians. The present paper investigated the feasibility of using near-infrared (NIR) spectroscopy and chemometrics for identifying and quantifying melamine in liquor milk. A total of 75 samples were prepared. Uninformative variable elimination-partial least square (UVE-PLS) and partial least squares-discriminant analysis (PLS-DA) were used to construct quantitative and qualitative models, respectively. Based on the ratio of performance to standard deviate (RPD), UVE-PLS model with 3 components resulted in a better solution. The PLS-DA model achieved an accuracy of 100% and outperformed the optimal reference model of soft independent modeling of class analogy (SIMCA). Such a method can serve as a potential tool for rapid screening of melamine in milk products.
研究领域:
食品科学
·
分析化学
·
光谱学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 45
·26029-26038
·
IF 10.733
Xiaojian Shan,Zhang Cao,Guobin Zhu,Yan Wang,Qunting Qu,Gao Liu,Honghe Zheng
Silicon materials are the most viable candidates to overcome the limitations of the capacity and energy density of conventional graphite. Nevertheless, this technology is still at an early stage and needs competitive strategies for the electrode fabrication. Herein, a functionalized 3-dimensional (3-D) polyvinyl alcohol (PVA) network is prepared via in situ cross-linking with a trimethylol melamine (TMM) bridge, which enables an electrode with much improved mechanics and ionic conductivity. Under optimized conditions, the nano-Si anode using the obtained 3-D PVA binder exhibits superior electrochemical properties with the first coulomb efficiency of 90.81% and a reversible capacity of more than 3000 mA h g−1. At 20 C (84 A g−1) current density, the Si anode is able to deliver a capacity of 2338 mA h g−1. After 500 electrochemical cycles, it can still retain more than 85% of the initial capacity. The underlying mechanisms for the electrochemical enhancement are discussed in terms of the electrode laminate mechanics and the improved ionic transportation due to the TMM incorporation. The simple and facile method by adopting a functional cross-linker shows great promise for use with Si anodes in lithium ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2021
·Vol. 8
·期 13
·2100244
·
IF 6.147
Le Li,Zhi Xu,Xiaoxia Chen,Chenhong Fang,Deyue Yan,Guyu Xiao
The pore structures of carbons profoundly affect their properties and functions. The hard template method has been extensively employed to fabricate porous carbons. Generally, the heteroatoms of porous carbons remarkably boost their performances, thus various of strategies have been carried out to incorporate the heteroatoms into porous carbons. The usual hard templates, such as silica nanoparticle and polystyrene sphere, only function as a pore-forming agent. Herein, nanoscale melamine resin spheres (NMRSs) are fabricated for the first time. NMRSs can be decomposed to generate the template mesopore in situ during the pyrolysis of carbon precursors. Moreover, NMRSs also can work as a nitrogen-dopant for porous carbons. As a demonstration, the N,P-codoped hierarchically porous carbons are prepared using NMRSs as both pore-forming agent and dopant, which exhibit excellent catalytic performances for the oxygen reduction reaction (ORR), close to or better than those of the best performing metal-free doped carbon catalysts for the ORR. Therefore, this bifunctional template paves a facile pathway to fabricate porous carbons.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 26
·11705-11711
·
IF 3.591
Junyi Guo,Nan Guo,Zhongjie Du,Chen Zhang,Wei Zou
Organic silicone materials offer numerous benefits and hence hold significant potential in daily applications. However, poor flame-retardant properties may limit their use in the field of fire prevention. In this study, this problem was solved by designing a stable, facile, and effective fabrication method. A silane vinyl melamine/silicone foam (VTMO–APTES–PAA–MF/SI) with excellent flame-retardant properties was obtained through a step-by-step chemical surface modification method. Aminopropyl ethoxy silane (APTES) and vinyl methoxy silane (VTMO) provided cross-linking sites and formed a macromolecular network structure, thus improving the compatibility between the melamine foam (MF) and silicone material. As a result, VTMO–APTES—PAA–MF/SI exhibited a high limiting oxygen index and UL94 flame-retardant rating (31.1 vol%, V-0). Besides, compared with melamine/silicone foam (MF/SI), VTMO–APTES–PAA–MF/SI demonstrated better tensile strength and elongation at break.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2016
·Vol. 8
·期 41
·7516-7521
·
IF 1.915
Sheng Qiang Deng,Hong Yan Zou,Jing Lan,Cheng Zhi Huang
A novel method for sensitive melamine detection based on the aggregation-induced superior peroxidase-like activity of Cu2−xSe capped by sodium polystyrene sulfonate (PSS) (Cu2−xSe@PSS) nanoparticles has been developed. In the presence of melamine, Cu2−xSe@PSS nanoparticles aggregated and exhibited impressive peroxidase-like activity which can accelerate the oxidation of colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to its blue product (oxidized TMB) with H2O2. The enhancement of the absorbance intensity of oxidized TMB at 650 nm showed a good linear relationship with the addition of melamine ranging from 4.7 nM to 29.7 μM. And the detection limit for melamine was as low as 1.2 nM, which was far below the safety limits of melamine ingestion (20 mM in the USA and EU; 8 mM in infant formula in China). Control experiments suggested that the enhancement in the peroxidase-like activity of aggregation for Cu2−xSe@PSS in comparison to its disperse nanoparticles resulted from the ˙OH or O2˙− radical generated.
研究领域:
分析化学
·
食品安全
·
纳米生物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 134
·期 11
·
IF 1.866
Zijian Gao,Zhe Yu,Chang Huang,Lijie Duan,Guang Hui Gao
In this investigation, carboxymethyl cellulose (CMC)-reinforced poly(vinyl alcohol) (PVA) were prepared with trimethylol melamine as a chemical crosslinker. The structure and property of hydrogels were measured by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), texture analysis, and rheometry. The FTIR spectra demonstrated that the etherification reaction successfully occurred in the PVA–CMC hydrogels, and the SEM figures exhibited the homogeneous porous structure of the CMC–PVA hydrogels. The compression strength of the PVA–CMC hydrogels was 15 times higher than that of the PVA hydrogels. Moreover, the PVA–CMC hydrogels exhibited a higher storage modulus than that of the PVA hydrogels; this illustrated better elasticity for the PVA–CMC hydrogels. As a result, CMC-modified PVA hydrogels with high mechanical behavior will broaden the potential applications of hydrogels, such as in wound dressings, facial masks, and skin-protection layers. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44590.
研究领域:
材料科学
·
生物医学工程
✓ 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）