POLYMER DEGRADATION AND STABILITY
·
2025
·
IF 7.4
Xiao-Jie Li,Cai Liu,Cong-Yun Zhang,Zhu-Bao Shao,Bin Zhao
Epoxy resin (EP) is widely utilized in construction, rail transit, and structural engineering as coatings, adhesives, and resin matrices for fiber-reinforced composites, owing to its excellent processability, adhesion, thermal stability, and mechanical strength. However, its inherent high flammability significantly restricts its application in scenarios requiring stringent fire safety standards. Addressing this challenge, we developed a novel triazolyl-based cyclomatrix polyphosphazene (HTDA) that self-assembles with melamine cyanurate (MCA) through hydrogen bonding, forming a hybrid flame retardant (HTDA@MCA) with a distinctive lamellar structure. The impact of HTDA and HTDA@MCA on EP's thermal stability, fire resistance, and mechanical performance was systematically evaluated. Compared to HTDA alone, the HTDA@MCA hybrid demonstrated superior performance, significantly enhancing EP's elastic modulus, crosslink density, and glass transition temperature. At HTDA@MCA loadings of 7.5 % and 10 %, EP achieved a UL-94 V-0 rating and limiting oxygen index (LOI) values of 28.6 % and 29.4 %, respectively. Cone calorimeter and smoke density tests further revealed a 68 % reduction in peak heat release rate and a 54.8 % decrease in smoke production. The excellent dispersion and unique lamellar structure of HTDA@MCA contributed to significant improvements in EP's mechanical properties. This study proposes an innovative strategy for simultaneously improving the fire safety, thermal stability, and mechanical strength of EP, providing valuable guidance for the development of high-performance polymeric materials.
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高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Renjie Li,Siqi Wei,Kaixi Yin,Dan Huang,Wenxi Wang,Xiandeng Hou,Li Wu
Herein, we constructed a SERS sensing platform based on a core-shell material, AuNRs@ZnO-Ov, for the detection of melamine in milk. The high Raman signal intensity can be attributed to the synergistic effect between the electromagnetic enhancement and chemical enhancement. The FDTD and molecular energy level calculations have verified the amplification of the electromagnetic field and the process of charge transfer. The AuNRs@ZnO-Ov exhibited high SERS performance with an enhancement factor (EF) of 7.08 × 10 6 , and a limit of detection (LOD) of 4.06 × 10 −8 M for melamine with good uniformity and reproducibility. Furthermore, the SERS platform delivered good linearity across a wide concentration range of 5 × 10 −8 to 5 × 10 −4 M. The proposed method has been successfully used for the detection of melamine in milk samples. This study provides a potential strategy for the construction of novel SERS substrates for molecules sensing in food.
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PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2016
·
IF 2.75
Oluwasola Oribayo,Xianshe Feng,Garry L. Rempel,Qinmin Pan
Oil spills have serious impact on the environment, and its effective remediation for environmental protection is of global significance. Thus, oil sorbents with interconnected microporous structures having superoleophilic and superhydrophobic properties have attracted significant interest as sorption materials for oil spill clean-ups. In this study, an approach inspired by the adhesive proteins secreted by mussels was used in modifying a commercially available formaldehyde-melamine-sodium bisulfite copolymer foam ( FMSF) as a thiols and amine functionalized oil/solvent sorption material, resulting in significantly improved hydrophobicity and oleophilicity. Our strategy was based on facile conjugation of octadecylamine (ODA) and 1H,1H,2H,2H perfluorodecanethiol (PFD) molecules to polydopamine (PDA) adhered to the interior micropores of FMSF. The FMSF-PDA-PFD and FMSF-PDA-ODA foams so prepared showed excellent oil/water selectivity, without damaging its intrinsic 3-D porous structure. In oil and solvent sorption experiments using engine oil and chloroform , a very high oil sorption capacity (amounting to 84 and 152 times its own weight) was obtained respectively. They also showed excellent reusability, and the same good oil sorption capacity was retained after 50 cycles of sorption-squeezing steps. The absorbed oil in the foams could be removed and collected simply by squeezing, and the foams became ready for reuse. The superhydrophobic and superoleophilic foams exhibited a significant potential as an effective and low-cost oil absorbent for applications in large-scale oil-spill clean-ups and recovery.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Binbin Nie,Yuanyuan Luo,Jianping Shi,Lei Gao,Guotao Duan
This article presented a facile and productive method to prepare a bowl-like pore array composed of hollow Au/Ag alloy nanoparticles (Au/Ag BPHAN array). It was found that Au/Ag BPHAN array showed the great SERS activity in the detection of melamine molecule. The experimental results for 10 −5 M melamine solution indicated the SERS intensity was about five times larger than that of Ag or Au samples when the ratio of Au to Ag was close to 1:1. Especially, the detection limit was 10 -9 M which was one order of magnitude lower than the reported value in references. SERS enhancement mechanism was the surface plasmon resonance in the alloy nanoparticles as presented in the simulation results by FDTD. To test the performance of the BPHAN arrays in real food samples, the melamine intentionally added to the milk powder was detected. The results showed that the SERS peaks assigned to melamine were very clear and the detection limit was already low to 0.1 ppm, 10 times lower than the tolerance level in infant milk products imposed by FDA of U.S. and 1.5 times lower than the strictest standards in the world, proposed by the Codex Alimentarius Commission in 2012. As far as we know, this was the highest sensitivity record of melamine in solid milk powder by SERS detection.
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高影响因子
Journal of Energy Storage
·
2022
·
IF 8.907
Dengji Xu,Wanyu Shen,Shiqi Sun,Yanjun Chen,Zhumao Lu,Xiaokai Meng,Chao Wang,Li Guo,Changcheng Liu,Que Huang
The purpose of this study is to explore a new clean and environment protecting composite microcapsule material with 1-dodecanol (DD) as the core and modified methylated melamine-formaldehyde (MMF) as the shell, to meet the needs of low temperature heat or energy storage (0–40 °C). The microencapsulated phase change material (MPCM) base with a mass ratio of 14:3 was synthesized by in-situ emulsion polymerization , then two kinds of additives 10 wt% boron nitride (BN) and 5 wt% BN mixed with 5 wt% carbon nanotubes (CNTs) were applied to solve the defects of easy leakage and low thermal conductivity , while the samples were defined and shorted as BPCM and BCPCM, respectively. The experimental results showed that the prepared BCPCM presented good storage stability in the temperature range of 0–40 °C, which was due to its good thermal conductivity of 0.584 W/m·K, latent heat of 163.8 J/g, and strong supramolecular interaction between 1-DD and MMF. Through charging and discharging tests for batteries under low temperature, BCPCM indicated excellent thermal management performance, which proposed its application potential in the cryogenic storage environments and battery thermal management system (BTMS) field.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 33
·期 10
·3279-3285
·
IF 3.348
Jiaji Cheng,Yuqi Liu,Moyun Kang,Shaoshuai Niu,Yapeng Wang,Yu Guan,Feng Zhang
Due to the energy crisis and environmental pollution, the research on energy-efficient building has increasingly attracted attention. The phase change materials (PCMs) play a vital role in increasing the energy utilization efficiency. In order to protect the PCMs from leakage during phase change process, the melamine sponge (MS) and modified melamine sponge (MMS) are considered as the frameworks. The leakage rate of MS and MMS sample were compared. The thermal and fire behavior was investigated by small room model, infrared thermal imager and cone calorimeter. The results show that the leakage rate of MS is much higher than that of MMS. On the condition of the same percentage of PCMs, MMS sample has better temperature control performance. The MS sample releases heat much faster and more than MMS sample. While MMS plays a role in inhibiting ignition.
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高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2012
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IF 2.823
Feng Gao,Qingqing Ye,Peng Cui,Lu Zhang
We here report an efficient and enhanced fluorescence energy transfer system between confined quantum dots (QDs) by entrapping CdTe into the mesoporous silica shell (CdTe@SiO2) as donors and gold nanoparticles (AuNPs) as acceptors. At pH 6.50, the CdTe@SiO2–AuNPs assemblies coalesce to form larger clusters due to charge neutralization, leading to the fluorescence quenching of CdTe@SiO2 as a result of energy transfer. As compared with the energy transfer system between unconfined CdTe and AuNPs, the maximum fluorescence quenching efficiency of the proposed system is improved by about 27.0%, and the quenching constant, Ksv, is increased by about 2.4-fold. The enhanced quenching effect largely turns off the fluorescence of CdTe@SiO2 and provides an optimal “off-state” for sensitive “turn-on” assay. In the present study, upon addition of melamine, the weak fluorescence system of CdTe@SiO2–AuNPs is enhanced due to the strong interactions between the amino group of melamine and the gold nanoparticles via covalent bond, leading to the release of AuNPs from the surfaces of CdTe@SiO2; thus, its fluorescence is restored. A “turn-on” fluorimetric method for the detection of melamine is proposed based on the restored fluorescence of the system. Under the optimal conditions, the fluorescence enhanced efficiency shows a linear function against the melamine concentrations ranging from 7.5 × 10–9 to 3.5 × 10–7 M (i.e., 1.0–44 ppb). The analytical sensitivity is improved by about 50%, and the detection limit is decreased by 5.0-fold, as compared with the analytical results using the CdTe–AuNPs system. Moreover, the proposed method was successfully applied to the determination of melamine in real samples with excellent recoveries in the range from 97.4 to 104.1%. Such a fluorescence energy transfer system between confined QDs and AuNPs may pave a new way for designing chemo/biosensing.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Jian Zhu,Hui Chang,Jian-Jun Li,Xin Li,Jun-Wu Zhao
Both “turn-on” and “turn-off” fluorescent probe for the determination of melamine have been developed by tuning the inner filter effect (IFE) from CdTe quantum dots (QDs) to gold nanoparticles. Because of the melamine-induced aggregation of gold nanoparticles, the first absorption peak of the transverse surface plasmon resonance (SPR) at 520 nm fades down, whereas the second absorption peak of the longitudinal SPR around 620 nm gets intense. The decrease of the transverse SPR reduces the IFE of the bundled CdTe QDs with an emission band at 525 nm (the corresponding particle size is 1.98 nm), which results in the melamine concentration-dependent fluorescence recovery of CdTe QDs. The increase of the longitudinal SPR enhances the IFE of the bundled CdTe QDs with an emission band at 620 nm (the corresponding particle size is 3.68 nm), which results in the melamine concentration-dependent fluorescence decrease of CdTe QDs. The green mode detection with the fluorescence recovery has a linear response for melamine from 20 to 100 ng/mL with a theoretical detection limit of 8 ng/mL. The red mode detection with the fluorescence decrease has a linear response for melamine from 20 to 100 ng/mL with a theoretical detection limit of 11 ng/mL. Interference studies and real samples detection show that the melamine could be specifically detected using this dual-mode fluorescent probe.
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高影响因子
RSC Advances
·
2021
·Vol. 11
·期 24
·14295-14305
·
IF 3.361
Qingmei Zhu,Xianghui Wang,Xiuqiong Chen,Changjiang Yu,Qi Yin,Huiqiong Yan,Qiang Lin
Since PVA membrane is of limited use for food packaging applications in moist conditions, polyvinyl alcohol/melamine-formaldehyde resin (PVA/MF) composite coating membranes with various contents of MF were fabricated by a chemical crosslinking method to reduce the sensitivity of PVA to moisture. The morphology, chemical structure, thermal and mechanical properties of the resultant PVA/MF composite coating membranes were characterized by scanning electron microscopy (SEM), FT-IR spectrometer, X-ray diffraction (XRD), thermal gravimetric analysis (TGA), differential scanning calorimeter (DSC) and universal testing machine. In addition, their hazes and OTRs were also measured as a function of MF content. Experimental results showed that –OH in the molecular chain of MF and PVA could be crosslinked at room temperature to form a dense polymeric structure, resulting in the increase in viscosity and the decline in water absorption. The incorporation of MF into PVA gave rise to the enhancement of crosslinking through the C–O–C bonding and strong interface interaction between MF and PVA that was beneficial to improving its thermal stability, mechanical properties and barrier properties. Furthermore, the PVA/MF composite coating membranes exhibited superior transparency due to their good leveling and wettability on both BOPET and PLA substrates. The moisture resistance and barrier properties of the MF/PVA composite coated BOPET and PLA membranes under high humidity conditions have been greatly improved, and the oxygen transmission rates (OTRs) under 75% RH could still remain at about 1.0 cm3 per m2 per day. These characteristics of the PVA/MF composite coating membranes have made them exhibit widespread application prospects for coating membranes in the food packaging field.
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PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Cheng Lu,Yu Hui Huang,Jiang Sheng Hong,Yong Jun Wu,Juan Li,Ji Peng Cheng
Carbon aerogel/xerogel can be easily tuned to have hierarchical pores ranging from micropores to macropores. Nitrogen doping is considered to enhance the wettability and conductivity of the carbon electrode, hence improve the electrochemical performance . To prepare N-doped carbon xerogel and study the effects on the structure and the electrochemical performance of resorcinol and formaldehyde derived carbon xerogel , a series of Resorcinol-Melamine-Formaldehyde derived N-doped carbon xerogel were prepared by a facile sol-gel process and ambient drying method. With the increasing amount of melamine, the inside channels become larger, which contributes to faster ion transport and smaller charge transfer resistance ( R ct ). The Nitrogen content in carbon xerogel is also increased, enhancing the capacitance of carbon electrode by pseudocapacity effect, while damaging the rate performance by introducing more defects and larger degree of disorder. As a result, the best electrochemical performance is achieved in the RM-6-4 sample (resorcinol:melamine = 6:4), showing the largest capacitance of 139 F g −1 .
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Dan Lin,Anqi Liu,Lei Pan,Fan Yang,Liang Yang,Changlong Jiang
Sensors based on multiple fluorescence materials have been widely applied in detection because of reliability and reproducibility. High-performance on-site sensing strategies are vital to public safety and human health. Here, by modifying the carbon dots (CDs) with melamine (MA) molecules, we developed a novel dual-recognition fluorescence sensor for efficient and sensitive detection of salbutamol. Upon increasing salbutamol concentration, the fluorescence intensity of blue emission under 365 nm excitation decreased, while the yellow emission under 460 nm kept enhancing. The quench of blue emission leads to the yellow fluorescence enhancement by Fluorescence resonance energy transfer (FRET) from monodisperse CDs to clustered CDs. Both the two emission-intensity showed linear relationship with salbutamol concentration within a certain concentration range. Dual detection of fluorescence signals under 365 nm and 460 nm, with detection limits (3δ/K) as low as 7.12 and 16.67 nM, is possible. Machine learning is then employed to analyze its detection performance. Therefore, the quantitative detection of salbutamol can be achieved. Moreover, the dual-recognition assay endows salbutamol detection built-in self-calibration to ensure high assay sensitivity and precision. We demonstrated the application in the fluorescence tracking of salbutamol in real samples with satisfactory results. The study would anticipate this dual-recognition fluorescence sensing system would inspire fast high-precision sensor design for environmental, safety and health monitoring.
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高影响因子
DESALINATION
·
2025
·
IF 9.8
Yuqian Zhang,Chengping Li,Ziyi Wang,Zijian Li,Liang Wang,Kuzmin Anton,Xingqiao Wu,Ting Bian
Solar-driven desalination provides a sustainable approach to address global freshwater scarcity, yet its application is significantly hindered by mechanical instability and salt accumulation issues in conventional evaporators. Here, we report a mechanically robust, salt-resistant, and highly efficient three-dimensional hydrogel evaporator (TF/CB@SA/MF-SiO 2 ) that integrates tannic acid-Fe 3+ complexes (TF), carbon black (CB), SiO 2 nanoparticles, and sodium alginate (SA) within a porous melamine foam (MF) scaffold. The CB and TF components provide broadband (>97 %) light absorption from 250 to 2500 nm, while the in situ-formed SA-SiO 2 hydrogel network reinforces the composite structure through strong interfacial bonding, restricting polymer chain mobility and improving compressive strength and elasticity. Under standard one-sun irradiation, the evaporator maintains a high evaporation rate of 2.06 kg m −2 h −1 and demonstrates remarkable long-term stability even under high salinity conditions (up to 20 wt% NaCl). Mechanical testing reveals that the combined CB-SiO 2 reinforcement yields minimal deformation and superior recovery. Practical outdoor tests confirm the evaporator's reliability, yielding freshwater meeting WHO drinking water standards. This multifunctional evaporator demonstrates long-term durability and high salt rejection, providing a viable pathway toward scalable, off-grid desalination and wastewater purification.
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