JOURNAL OF ADHESION
·
2023
·
IF 2.2
Wenhao Liu,Chuanshuang Hu,Weiwei Zhang,Hong Yun,Jianping Shu,Jin Gu
The application of UV digital inkjet printing onto melamine-faced board (MF) has attracted increasing attention as an efficient and environmentally benign surface decoration method. However, the interface bonding between UV coating and melamine-formaldehyde surface is weak, resulting in poor printing durability. In this study, the MF surface is grafted with 3-(triethoxysilyl) propyl isocyanate (ICPTES) via a urea cross-linking process, and then condensed with γ-methacryloxypropyl trimethoxy silane (KH570) to improve its compatibility with the polyacrylate-based UV ink. A combination of physical (surface polishing) and chemical (dual-silane treatments) activations of MF surface enhances its interface bonding strength with UV coating up to 2.24 MPa, 966.7% and 119.6% higher than those of the untreated and the conventional adhesion promotor treated surface, respectively. FTIR results confirm that effectual chemical bonds are established between MF surface and UV coating by the ICPTES and KH570 dual-silane treatments. SEM imaging shows that a seamless connection between MF and UV coating forms. Thus, MF surface modified by silane is a facile and effective strategy to enhance the adhesion of UV digital ink and this printing method shows enormous potentials in a wide range of applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Yahui Chang,Na Wang,Gaoyi Han,Miaoyu Li,Yaoming Xiao,Honggang Li
With development of personal electronic devices, special energy storage devices such as compressible electrochemical capacitors (CECs) are becoming important. Here, we use artificial melamine sponge (aMS) as matrix, carbon fibers (CFs) as wires to stitch aMS to prepare compressible substrates (aMS-CFs). Polypyrrole (PPy) is then deposited on the aMS-CFs via gas-phase polymerization to get the compressible electrodes of PPy/aMS-CFs. The preparation conditions are optimized and the obtained samples are characterized in detail, the optimized PPy/aMS-CFs possesses a specific capacitance of 239.0 F g −1 based on the PPy. The testing results show that the assembled symmetric CECs (PPy/aMS-CFs//PPy/aMS-CFs) exhibit excellent electrochemical performance under different compressive strains , and change their capacitive properties with the change of the pressure. Compared with the normal condition, the capacitance of the optimized CEC increases significantly at higher scan rates but it is almost unchanged at 2 mV s −1 when the compression level reach 60%. Meanwhile, even after 1000 cycles of repeated compression with 60% compression rate, the CEC can still maintain good cyclic stability (84.4% capacitance retention after 10000 cycles). This kind of CEC may have potential application prospect in the field of personal electronics.
研究领域:
电化学
·
材料科学
·
能源存储
·
柔性电子学
·
纳米材料
·
高分子材料
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高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2026
·
IF 6.6
Naiqi Jiang,Xianmeng Du,Meng Zhou,Anrong Yao,Yanping He
The widespread application of solid-liquid phase change materials (PCMs) is hindered by leakage and their passive thermal response, particularly limiting the direct utilization of intermittent solar energy. While microencapsulation addresses leakage, conventional microcapsules often struggle with the trade-off between high energy density and mechanical/thermal robustness, lacking a synergistic understanding of structural and functional layers. To bridge this gap, this work presents a rational design of double-shell microcapsules (PDA/MF/ODE) via a tailored interfacial strategy, in which n-octadecane (ODE) is encapsulated by a melamine-formaldehyde (MF) shell followed by self-polymerization of a polydopamine (PDA) layer. PDA serves triple synergistic roles as an efficient photothermal layer, a mechanical reinforcement barrier, and an interface adhesive through hydrogen bonding with MF, significantly enhancing shell compatibility and robustness. The resulting PDA/MF/ODE microcapsules exhibit high latent heat (190.11–201.31 J/g), excellent shape stability (92.98% mass retention after 10 thermal cycles), and substantially reduced supercooling (from 12.50 °C for pure ODE to 5.41 °C). Mechanical properties are markedly enhanced—rupture force increases from 0.921 mN to 5.915 mN (6.4-fold) and toughness from 0.154 MPa to 0.300 MPa (1.95-fold). Under simulated sunlight, PDA/MF/ODE achieves 82.5% photothermal conversion efficiency, enabling direct solar-driven phase change energy storage. Furthermore, the microcapsules maintain exceptional mechanical and thermal cycling stability over 50 cycles with negligible performance degradation. This work provides a novel strategy for fabricating high-performance, solar-responsive microencapsulated PCMs by exploiting interfacial chemistry and multifunctional shell design.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Shenyi Jiang,Shuang Li,Pingbo Zhang,Hongyan Miao,Pingping Jiang,Yan Leng
Melamine sponge (MS) with open three-dimensional porous structure is regarded to be an ideal substrate to prepare monolithic adsorbents for heavy metal ions removal. However, most of the existing surface modification strategies of MS are still difficult to achieve a satisfactory adsorption ability for Pb(II). In this study, tannic acid (TA) and polyethyleneimine (PEI) were alternatively deposited on the framework of MS via layer-by-layer covalent assembly between polyphenols of TA and amine groups of PEI. The morphology, molecular structure, and overall properties of the obtained multilayer-decorated MS materials (PEI-TA) n -MS were characterized using SEM, XPS, FT-IR, and TGA . (PEI-TA) 2 -MS was demonstrated to be extremely stable and exhibited excellent adsorption behavior for Pb(II). The maximum Pb(II) adsorption capacity reached 257.4 mg/g at pH value of 5.0 and initial Pb(II) concentration of 200 mg/L. It is better than those of previous reported PEI-based adsorbents under similar conditions. The kinetic and isotherm data revealed that such process is exothermic, and well fits the Langmuir isotherm and the pseudo-second-order kinetic models. The present PEI-TA-based layer-by-layer assembly strategy may offer new prospects for the versatile design of other monolithic adsorbent materials.
研究领域:
环境科学
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材料科学
·
化学工程
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高影响因子
BIOSENSORS & BIOELECTRONICS
·
2021
·
IF 10.618
Bin Qiao,Jiakun Xu,Wenhao Yin,Wanmeng Xin,Lixin Ma,Jie Qiao,Yi Liu
Herein, we report a method that combined “aptamer-locker” DNA with CRISPR/Cas12a-based biosensing for sensitive and rapid melamine analysis. Three strategies were harnessed for designing the DNA sensors that were well characterized by circular dichroism (CD) spectroscopy and isothermal titration calorimetry (ITC) in the absence and presence of melamine. The detection parameters were optimized to achieve good analytic performance. As a result, a limit of detection (LOD) as low as 38 nM was achieved, which is below the threshold (1.0 mg/kg) of allowable melamine in infant milk products. In addition, the sensors show high selectivity for melamine against other analogues such as cyanuric acid , ammeline and ammelide . Moreover, our method was effective for rapid melamine analysis in whole milk samples, with or without sample pretreatment , in less than 20 min. Adopting a commercially available portable fluorimeter, on-site analysis of melamine in milk was accomplished. The strategies demonstrated here can expand to detect other non-nucleic-acid targets by simply replacing the aptamers.
研究领域:
分析化学
·
分子生物学
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生物技术
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食品安全
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DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Nian Lu,Wen-chang Wang,Xiao-hui Chen,Zhi-dong Chen
In this paper, a PSA/Ru(bpy) 3 2+ modified electrode was prepared by electrochemical polymerization and used as the working electrode in ECL detection of melamine. Under the optimal conditions, the sensor shows a wide linear range of 1.0×10 -7 ~1.0×10 -5 mol/L, detection limit of 2.5×10 -8 mol/L with good reproducibility and stability. The method is expected to be a new method for the detection of melamine, which is simple and convenient.
研究领域:
分析化学
·
食品科学
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Analytical Methods
·
2017
·Vol. 10
·期 4
·417-421
·
IF 1.9
Jing-yan Kang,Yu-jie Zhang,Xing Li,Chen Dong,Hong-yu Liu,Li-jing Miao,Paul J. Low,Zhi-xian Gao,Narayan S. Hosmane,Ai-guo Wu
A colorimetric sensor for the pesticide pymetrozine (PYM) based on analyte-induced aggregation of melamine-modified gold nanoparticles (M-Au NPs) has been developed with high selectivity and sensitivity with a detection limit of 80 nM by the naked eye and 10 nM by UV-Vis spectroscopy. This colorimetric sensing design exhibits lower detection limits, compared with limits of 46–148 nM for existing instrumental methods. The new aggregation-induced nanoparticle sensor is applicable for rapid colorimetric detection of PYM in real water environments (tap water and lake water) and food samples (green tea and apple juice). The technical approach for the colorimetric sensor is easier and simpler than detection of PYM by, for example, HPLC whilst giving equivalent results within the error of the measurements.
研究领域:
环境科学
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分析化学
·
食品科学
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高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2020
·Vol. 35
·期 2
·327-334
·
IF 0.64
Wang Haiping,Gui Pengce,Zhu Yangqian,Hu Siqian
A novel type of microencapsulated phase change materials (microPCMs) based on 1-tetradecanol (TD) core and silver-coated poly (melamine-urea-formaldehyde) (MUF) shell was successfully synthesized by in situ polymerization method followed by silver reduction. Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy with energy dispersive X-ray spectrometry (SEM/EDS), thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) were used to characterize the chemical structure, morphology and thermal properties of the as-prepared silver-coated microPCMs. FTIR analysis confirmed the successful encapsulation of TD with MUF wall materials. The SEM and EDS results indicated that the prepared silver-coated MUF microPCMs exhibited uniform spherical shape with a perfect silver outer layer. From XRD analysis, the Ag metal dispersed on the surface of microcapsules presented the form of elementary substance. The deposition weight of silver particles on the microcapsule surface increased with increasing the amount of silver nitrate, as indicated by EDS tests. The DSC results indicated that the melting temperature and the melting latent heat of microPCMs modified with 0.7 g of silver nitrate in 150 mL aqueous solution were 39.2 °C and 126.6 J·g −1 , respectively. Supercooling of the microPCMs coated with silver particles was effectively suppressed, compared with that of microPCMs without Ag. Thus, the encapsulation of TD with silver-coated MUF shell developed by this work can be an effective method to prepare the microPCMs with enhanced thermal transfer performance and phase change properties.
研究领域:
材料科学
·
化学工程
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Chenjian Li,Huaqing Zhang,Yiheng Song,Lixin Cai,Jima Wu,Jinxing Wu,Shan Wang,Chuanxi Xiong
The high electromagnetic interference (EMI) shielding performance composites with light-weight and multi-function have become the main developing orientation in the EMI shielding materials field. This study aims to fabricate lightweight melamine-formaldehyde-based composite (SiO 2 @Ag@MF) foams with high EMI shielding characteristics through facile and green electroless silver (Ag) plating and polydimethylsiloxane/SiO 2 (PDMS/SiO 2 ) coating methods. The results indicated that SiO 2 @Ag@MF foam possessed outstanding EMI shielding performance with the maximum shielding effectiveness ( SE T ) of 65 dB, low density (0.014–0.019 g/cm 3 ), and high specific shielding effectiveness ( SSE T ) of 3439 dB cm 3 g −1 due to the open-cell porous structure and high electroconductive Ag-plated skeleton. Meanwhile, because of the PDMS and SiO 2 coating, the composite foam delivers superhydrophobicity, anti-corrosion, and anti-fatigue performance.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
·
2017
·
IF 2.221
Ruoping Li,Jingliang Yang,Junhe Han,Junhui Liu,Mingju Huang
A Raman method employing silver nanoparticle (Ag NP) monolayer film as Surface-enhanced Raman Scattering (SERS) substrate was presented to rapidly detect melamine in milk. The Ag NPs with 80 nm diameter were modified by polyvinylpyrrolidone to improve their uniformity and chemical stability. The treatment procedure of liquid milk required only addition of acetic acid and centrifugation, and required time is less than 15 min. The Ag NP monolayer film significantly enhanced Raman signal from melamine and allowed experimentally reproducible determination of the melamine concentration. A good linear relationship (R 2 =0.994) between the concentration and Raman peak intensity of melamine at 681 cm −1 was obtained for melamine concentrations between 0.10 mg L −1 and 5.00 mg L −1 . This implies that this method can detect melamine concentrations below 1.0 mg L −1 , the concentration currently considered unsafe.
研究领域:
食品安全
·
分析化学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Jinwei Xue,Lei Zhu,Xu Zhu,Hui Li,Chao Ma,Shifan Yu,Daofeng Sun,Fujun Xia,Qingzhong Xue
In recent years, oil spills and industrial organic pollutants have caused irreparable damage to the environment and biological ecosystems. Therefore, the treatment of oily wastewater has become a serious global challenge. Here, we prepared superhydrophobic and superoleophilic tetradecylamine-MXene functionalized melamine sponge for effective oil/water separation and selective oil adsorption using a facile and effective method. It is found that the functionalized sponge can selectively and effectively absorb various oils from oil/water mixtures, which absorption capacity ranges from 60 to 112 times its own mass. Moreover, the water-in-oil emulsion can be efficiently separated by the functionalized sponge, due to its high oil selectivity. Besides, the functionalized sponge shows great mechanical property, chemical stability, and repeatability in various harsh environments, which make it great promising in the treatment of oily wastewater.
研究领域:
环境科学
·
材料科学
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高影响因子
EUROPEAN POLYMER JOURNAL
·
2019
·
IF 3.621
Nabila Mehwish,Ayesha Kousar,Auphedeous Yinme Dang-i,Juexin Huang,Xiaoqiu Dou,Chuanliang Feng
Molecular recognition of achiral structural analogues, a remaining challenge for materials scientists and chemists, is the key to manipulating the applications and properties of supramolecular chiral materials. Herein, we report the molecular recognition of two harmful structural analogues i.e. melamine (MA) and cyanuric acid (CA) by using C 2 -symmetric phenylalanine chiral hydrogelators. Two distinct molecular recognition events between hydrogelator fibrils and triazine based achiral molecules are demonstrated: phenylalanine-co-melamine (PF-co-MA) gels showed chirality amplification while chirality inversion was observed for phenylalanine-co-cyanuric acid (PF-co-CA) gels. Moreover, viscoelastic properties and twist pitch were also regulated under the influence of the achiral molecules. Such phenomenon is mainly mediated by H-bonding among the two components, which may subtly change the arrangement of the molecules, in turn, the self-assembled nanostructures. This method of using C 2 -symmetric phenylalanine based gelators in the recognition of the achiral molecules may be broadly applicable for a wide variety of molecular recognition partners such as sugars.
研究领域:
超分子化学
·
材料科学
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高影响因子
危险品化学品经营许可证（带存储）