NEW JOURNAL OF CHEMISTRY
·
2016
·Vol. 40
·期 10
·8459-8464
·
IF 3.277
Qianqian Du,Fei Qu,Beibei Mao,Shuyun Zhu,Jinmao You
An efficient sensor was developed for highly sensitive and selective determination of melamine based on Ag nanoclusters (Ag NCs) capped by hyperbranched polyethyleneimine (PEI) molecules with different molecular weights. The fluorescence of the Ag NCs could be quenched by Hg2+ and recovered by melamine. The molecular weights of PEI had an appreciable effect on the sensitivity, and Ag NCs capped by PEI with a molecular weight of 600 were more sensitive; the linear range of melamine was from 0.1 to 30 μM with a detection limit 30 nM. Moreover, this Ag NCs–Hg2+ system displayed excellent selectivity over common interferences such as metal ions, amino acids, sugars and nitrogen-containing organic molecules. Benefiting from the high selectivity, good recoveries ranging from 96% to 101% were obtained in food samples, including milk, infant formula, and dog food. More importantly, Ag NC-doped agarose hydrogels were fabricated easily to construct a visual device for the detection of melamine in food samples.
研究领域:
分析化学
·
食品安全
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2019
·Vol. 31
·期 4
·795-806
·
IF 2.162
Teng Li,Shuai Li,Tongjun Ma,Yi Zhong,Linping Zhang,Hong Xu,Bijia Wang,Xiaofeng Sui,Xueling Feng,Zhize Chen,Zhiping Mao
A novel strategy was developed for the preparation of melamine polyphosphate (MPP) nanowires to achieve a superior flame-retardant poly (ethylene terephthalate) (PET). Thanks to the well-designed nanostructure, the prepared MPP nanowires exhibited great thermal stability and flame retardance. Herein with incorporation of only 1-wt% MPP nanowires (PET/FR1.0 nanocomposite), the limiting oxygen index (LOI) value was dramatically increased to 29.4% from 20.5%, showing self-extinguishing behavior. Moreover, PET/FR1.0 nanocomposite passed V-0 UL-94 rating in the vertical combustion test. However, PET containing 5-wt% commercial MPP powder (PET/FR C 5.0) only showed a LOI of 27.9% and ignited the absorbent cotton with flammable melt-droplets. Cone results also presented that introducing 1-wt% MPP nanowires brought about a crucial decrease in fire hazard of PET, for instance, 11.1% and 7.7% maximum reduction in heat release rate and total heat release, respectively. Thermogravimetric analysis/infrared spectrometry (TG-FTIR) result indicated that the main pyrolysis volatiles generated from PET degradation including benzoic acid, aromatic compounds, and carbon dioxide were apparently suppressed after introducing MPP nanowires into PET matrixes, suggesting the outstanding obstructing effect of graphited char residue formed in the combustion. This enhanced flame retardancy rooting in addition of MPP nanowires can be attributed to the combined dilution effect in gaseous phase and catalytic carbonization effect in condensed phase.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Lizhi Wang,Jiangfei Guo,Xiyuan Xiang,Yafei Sang,Jianhan Huang
Functionalized porous organic polymers (POPs) with high Brunauer-Emmett-Teller (BET) surface area ( S BET ) and unique porosity is promising while its facile synthesis remains a challenge. Herein, a novel synthesis strategy based on Schiff-base chemistry was developed and melamine was embedded as a rigid external cross-linker to construct a kind of novel functionalized POPs. The resulting melamine-supported polymers showed high S BET (645 m 2 /g) and total pore volume ( V total , 0.84 cm 3 /g) with unique hierarchical porosity, indicative of its outstanding CO 2 capture and Hg 2+ removal. Noticeably, the as-prepared sample TPE-TMC-2MA exhibited high CO 2 uptake of 153 mg/g and its ultramicropore volume ( V ultra , 0.16 cm 3 /g) played a positive role. In particular, the maximum capacity of Hg 2+ reached 392 mg/g, much higher than some other materials reported in the literature.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 10
·2102092
·
IF 6.389
Junjun Ma,Yangchun Xie,Tao Yang,Xiaohua He
Innovative 3D materials with the switchable wetting surface attract significant attention due to their application in oil/water separation. Herein, a fast pH-responsive and highly effective melamine foam (MF) grafted with poly (2-dimethylaminoethyl methacrylate) is prepared by surface-initiated chain transfer radical polymerization. The as-prepared MF displays superhydrophilic and superoleophobic surface in strong acid solution while it becomes superhydrophobic in neutral or basic solution. Therefore, it can be rapid to selectively absorb different types of oils from the oil–water mixture with a great absorption capacity of 54–117 g g −1 and automatically desorb oil in less than 60 s with a desorption efficiency of 99% (dichloromethane) in acid solution. Moreover, the as-prepared MF possesses excellent recyclability, and the absorption capacity and the desorption efficiency are almost unchanged after 15 cycles. The pH-sensitive MF with switchable wetting surfaces has great potential for the oily water separation.
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 7
·1202
·
IF 5.719
Zhenming Wang,Jianxun Liu,Jiawei Wang,Zongjun Ma,Delai Kong,Shouzhen Jiang,Dan Luo,Yan Jun Liu
Surface-enhanced Raman spectroscopy (SERS) has long been an ultrasensitive technique for trace molecule detection. However, the development of a sensitive, stable, and reproducible SERS substrate is still a challenge for practical applications. Here, we demonstrate a cost-effective, centimeter-sized, and highly reproducible SERS substrate using the nanosphere lithography technique. It consists of a hexagonally packed Ag metasurface on a SiO2/Au/Si substrate. A seconds-lasting etching process of a self-assembled nanosphere mask manipulates the geometry of the deposited Ag metasurface on the SiO2/Au/Si substrate, which attains the wavelength matching between the optical absorbance of the Ag/SiO2/Au/Si substrate and the excitation laser wavelength as well as the enhancement of Raman signals. By spin-coating a thin layer of graphene oxide on the substrate, a SERS performance with 1.1 × 105analytical enhancement factor and a limit of detection of 10−9M for melamine is achieved. Experimental results reveal that our proposed strategy could provide a promising platform for SERS-based rapid trace detection in food safety control and environmental monitoring.Keywords:SERS;self-assembly;metasurface;surface plasmon;hot spot;sensitivity
研究领域:
分析化学
·
材料科学
·
食品安全
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Xiang Yuan,Huiling Zhang,Xiang Yuan,Guojiang Mao,Lin Wei
In this work, we demonstrate a simple and label-free single particle detection (SPD) method for the quantification of melamine (Mel) based MnO 2 -modified gold nanoparticles (Au@MnO 2 NPs). Without Mel, MnO 2 shell of Au@MnO 2 NPs are able to be directly decomposed by gallic acid. In the existence of Mel, the decomposition process is restrained due to the strong hydrogen bonding between Mel and gallic acid. The selective etching of MnO 2 shell on AuNPs surface results in evident color change from single Au@MnO 2 NPs. Through quantitatively enumerating the number of color coded particles, trace amounts of Mel can be accurately detected. A linear range from 0.02 to 1 μM (R 2 = 0.98) and a limit of detection of 16.7 nM are acquired. In milk sample, satisfactory recovery was acquired. Therefore, the SPD method is expected to be used for the detection of various chemical contaminants in food.
研究领域:
分析化学
·
食品安全
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 14
·2488
·
IF 5.719
Hanmo Si,Qingwang Liu,Zhenzhong Fan,Biao Wang,Qilei Tong,Mengqi Lin
The problem of offshore oil leakage has wreaked havoc on the environment and people’s health. A simple and environmentally friendly impregnation method combined with marine mussel bionics was used to address this issue. Using the viscosity of polydopamine (PDA), nano- Fe3O4and WS2adhered to the framework of the melamine sponge (MS), and then the magnetic sponge was modified with n-octadecanethiol (OTD), and finally the superhydrophobic magnetic melamine sponge (mMS) was prepared. The modified sponge has superhydrophobicity (WCA, 156.8° ± 1.18°), high adsorbability (40~100 g°g−1), recyclability (oil adsorbability remains essentially unchanged after 25 cycles), efficient oil–water separation performance (>98%), and can quickly separate oil on the water’s surface and underwater. Furthermore, the modified sponge exhibits excellent stability and durability under harsh operating conditions such as strong sunlight, strong acid, strong alkali, and high salt, and can control the direction of the sponge’s movement by loading a magnetic field. To summarize, mMS has many potential applications as a new magnetic adsorption material for dealing with complex offshore oil spill events.Keywords:superyhydrophobicity;melamine sponge;polydopamine;nano-particles;oil–water separation
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 9
·e53546
·
IF 3.057
Wei Lu,Zhipeng Zeng,Zhenglong He,Yuntao Liang,Yong Sun,Shuanglin Song,Lili Wang,Ruling Liu
A highly dispersed melamine/red phosphorus (MA/RP) composite flame retardant was prepared by means of simple mechanical grinding. After co-thermal pretreatment with polyether polyol (PPG-2000) at 135°C, organic–inorganic hybrid foams (MA/RP/HF) containing MA/RP flame retardant were prepared by the one-step method using main raw materials such as polyisocyanate and sodium silicate. When 0.5 wt% MA/RP with the mass ratio of 1:5 is added, MA can realize the uniform dispersion of RP in the substrate and enhance its flame retardancy, and the obtained MA/RP/HF presents uniform and closed pores and excellent basic properties. The TG results reveal that MA/RP/HF shows good thermal stability and the corresponding char residual rate reaches 37.9% at 800°C. The flame retardant test results prove that MA/RP/HF is capable of passing the V-0 grade, with the LOI value being 26.8%. According to the cone calorimeter analysis, its peak heat release rate and total heat release decrease by 30.1% and 51.7% compared with those of rigid polyurethane-based foam and by 40.1% and 30.0% compared with those of pure HF, respectively. Finally, the synergistic flame retardancy mechanism of MA and RP on polyurethane-based foam was discussed.
研究领域:
材料科学
·
燃烧与防火研究
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Electronic Materials
·
2023
·
IF 4.7
Tingting Yu,Yebo Tao,Yali Wu,Dongguang Zhang,Jiayi Yang,Xingjun Liu
Three-dimensional graphene foam (GF)-based flexible piezoresistive sensors have the advantages of high conductivity, large deformable range and light weight, which has been utilized in human health measurement, electronic skin, and wearable devices. However, the encapsulation and electrode connections of such sensors reduce breathability, resulting in discomfort and even skin irritation. In this study, a self-encapsulated breathable GF (SEB–rGO–MF) and an SEB–rGO–MF-based piezoresistive sensor (SEB–rGO–MF–PS) are proposed. The SEB–rGO–MF–PS consists of a SEB–rGO–MF and two electrodes, ensuring encapsulation and electrical connection without compromising breathability and stability. We performed material characterization and breathability tests of the SEB–rGO–MF and investigated the sensing mechanism of the SEB–rGO–MF–PS. The SEB–rGO–MF–PS exhibits a sensitivity of 0.108 Pa–1, a measurement range of 0.013–15 kPa, rapid response/recovery times (83 and 166 ms), and excellent stability (2000 cycles at 15 kPa). In addition, this study demonstrates the application of the SEB–rGO–MF–PS for human motion monitoring.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2024
·
IF 4.5
Zhaoshun Zhang,Hui Zhang,Qi Zhang,Yuanyuan Ye,Yulong Zheng,Xueqin Zuo,Qun Yang,Huaibao Tang,Shaowei Jin,Guang Li
Solar desalination has received great attention as an environmentally friendly and cost-effective way to desalinate seawater. In this paper, a melamine sponge composite polypyrrole (MSPPy) evaporator was prepared by in-situ polymerization of Pyrrole (Py) on a melamine sponge (MS). PPy has an efficient light absorption ability. The large aperture network structure of MS can realize multiple reflections of light and greatly increase the absorption of light. Their synergistic effect makes the light absorption efficiency of the MSPPy evaporator reach 96.97%. Under one sun, the average evaporation rate of 1.886 kg⋅m −2 ⋅h −1 and energy conversion efficiency of 96.8% were achieved during 10 h. Moreover, the evaporator has an edge-priority crystallization function, which enables it to work for a long time in a high-salt environment. It works continuously for 12 h in simulated seawater with a salinity of 20% without further accumulation of salt crystals on its surface. More important, it can rapidly diffuse accumulated salt into the bulk water at night. This study provides a new idea for the application of solar steam generation technology in high-salt wastewater treatment.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2022
·Vol. 307
·期 9
·2200180
·
IF 4.402
Xuemei Zhang,Chen Gao,Yulin Zhang,Xiangdong Wang,Yuhan Duan,Jun Peng,Ping Luo,Yinjie Peng,Xiaoyu Wang,Shisen Wang,Rong Ran
A novel double-crosslinked 3D network hydrogel, poly(aniline-co- p -phenylenediamine-co-melamine) (PD 2 M 4 ) is synthesized through the chemical oxidative copolymerization of aniline, melamine, and p -phenylenediamine, and its properties are compared with those of polyaniline (PANI), poly(aniline-co- p -phenylenediamine) (PPDA 2 ), and poly(aniline-co-melamine) (PMA 4 ) hydrogels. The morphologies, mechanical properties, and chemical compositions of the hydrogels are investigated by nitrogen physisorption, rheological test, microscopic measurements, and spectroscopic techniques, while electrochemical techniques are used to evaluate their electrochemical performances. In accordance with PANI, PPDA 2 , and PMA 4 hydrogels, the PD 2 M 4 hydrogel exhibited an interconnected long nanofiber structure that encouraged the diffusion of electrolyte ions. Its double-crosslinked 3D network and high nitrogen-doping content (6.3 at. %) offered synergistic effects that generated an impressive pseudocapacitance of 657 F g −1 at 0.2 A g −1 , a superior rate capability of 72% retention at a high current density of 30 A g −1 , and good cyclic stability of 62% after 2000 charge/discharge cycles. The present work, therefore, provides a novel copolymerization strategy for N-doping and hierarchical network structure to enhance the electrochemical performances of PANI hydrogel electrodes in supercapacitor applications.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Sheng Shang,Bihe Yuan,Yaru Sun,Gongqing Chen,Chuyuan Huang,Bin Yu,Song He,Huaming Dai,Xianfeng Chen
Melamine-phytate (MEL-PA) nanoflakes are formed by supramolecular self-assembly technology using melamine (MEL) and bio-based phytic acid (PA) as the building blocks. This work explores the possibility of this two-dimensional nanomaterial as flame retardant . The layered MEL-PA with the loading of 1, 2 and 3 wt% are incorporated into polypropylene (PP) matrix. MEL-PA is dispersed well in the PP matrix. Thermal stability and flame retardant performance of PP/MEL-PA composites are investigated. Compared with neat PP, the addition of 2 wt% MEL-PA decreases the peak heat release rate from 756 to 608 kW/m 2 . Char yield of PP is improved by MEL-PA, and the chemical structure and graphitization degree of residual char are studied to reveal flame retardant mechanism.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）