POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 33
·期 10
·3279-3285
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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.
研究领域:
建筑材料
·
能源工程
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DOI
高影响因子
ChemSusChem
·
2020
·Vol. 13
·期 7
·1834-1843
·
IF 7.962
Jingwei Zhu,Benlin He,Zekun Gong,Yang Ding,Wenyu Zhang,Xueke Li,Zhihao Zong,Haiyan Chen,Qunwei Tang
Graphical Against the grain : Adding melamine maximizes grain size and minimizes defects in CsPbBr 3 perovskite films. The resulting CsPbBr 3 perovskite solar cell (PSC) free of encapsulation achieves a champion power conversion efficiency (PCE) of 9.65 % and excellent thermal and humidity stability. The preparation of high-quality perovskite films with low grain boundaries and defect states is a prerequisite for achieving high-efficiency perovskite solar cells (PSCs) with good environmental stability. An effective additive engineering strategy has been developed for simultaneous defect passivation and crystal growth of CsPbBr 3 perovskite films by introducing 1,3,5-triazine-2,4,6-triamine (melamine) into the PbBr 2 precursor solution. The resultant melamine–PbBr 2 film has a loose, large-grained structure and decreased crystallinity, which has a positive effect on the crystallization process of the perovskite as it retards the crystallization rate as a result of the interaction between melamine and lead ions. Additionally, the passivation by melamine gives a high-quality CsPbBr 3 perovskite film with fewer grain boundaries, lower defect densities, and better energy level matching is achieved by multistep liquid-phase spin-coating, which greatly suppresses the nonradiative recombination resulting from the defects and promotes charge extraction at the interface. A champion power conversion efficiency as high as 9.65 % with a promising open-circuit voltage of 1.584 V is achieved for PSCs with an architecture of fluorine-doped tin oxide/c-TiO 2 / m -TiO 2 /melamine-added CsPbBr 3 /carbon-based hole-transporting layer. Furthermore, the unencapsulated melamine-added CsPbBr 3 PSC shows superior thermal and humidity stability in ambient air at 85 °C or 85 % relative humidity over 720 h.
研究领域:
材料科学
·
能源技术
·
光伏器件
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2023
·
IF 11.1
Wei Li,Yue-Lei Hao,Wei-Liang Jin,Jing-Qi Liu,An-Na Tang,Li-Na Zhu,Hong-Xin Jiang,De-Ming Kong
The assessment and treatment of heavy metal pollution are eternal subjects of environmental protection. Facile on-site assessment of heavy metal pollution and efficient, rapid removal of pollutes are still challenging. Covalent organic frameworks (COFs) hold great promise as absorbents for heavy metal pollution treatment. To overcome the application limits of COF powders, a COF-based monolithic composite is prepared by direct in-situ growth of an N/O-rich COF on the surface of a melamine foam (MF). The resultant MF@COF inherits the macro-porous channels of MF, the good crystallinity of COF, and integrates the attractive features of monolithic materials such as ease of operation, facile and highly efficient recovery, and good reusability . The abundant N/O groups endow MF@COF with powerful capture capability towards various heavy metal ions . Its maximum adsorption capacity for Cd 2+ is 278.45 mg/g, and the adsorption equilibrium can be reached within 1–3 s. The adsorption kinetic of Cd 2+ by MF@COF follows the pseudo-second-order kinetic model , and the adsorption isotherm conforms to Freundlich model. Rapid adsorption, together with the easy-to-operate feature of monolithic material, make the ultrafast water purification possible. Meanwhile, MF@COF works well for the highly efficient enrichment of Cd 2+ to realize the naked-eye detection of Cd 2+ pollution at low levels, thus may be developed as an important tool for both on-site assessment and rapid treatment of heavy metal pollution.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2018
·
IF 8.173
Yue Hua,Min Liu,Shuai Li,Fengjuan Liu,Yuanyuan Cai,Huan Liu,Yuqi Wan,Xiaoxia Lv,Hua Wang
An electroanalysis strategy has been developed for probing glutathione (GSH) separately in hela and yeast cells based on the displacement reaction route using melamine-copper (MA-Cu) nanocomposites . Herein, MA-Cu nanocomposites were initially synthesized by the controlled supermolecular self-assembly process showing various morphological structures depending on the MA-to-Cu ratios used. It was discovered that the electrodes modified with rod-like MA-Cu nanocomposites could achieve the stable electrochemical output of solid-state CuCl at a low potential, which might circumvent the possible interference from co-existing electroactive substances in complicated backgrounds like cells. More importantly, the yielded CuCl signals would decrease selectively induced by GSH through the specific Cu-GSH interaction that would trigger the displacement of CuCl into non-electroactive complex. The MA-Cu nanorods-modified electrodes can allow for the detection of GSH with the concentrations linearly ranging from 0.010 to 300.0 μM. Subsequently, the feasibility of the developed electroanalysis strategy was demonstrated for the evaluation of GSH separately in the extractions of hela and yeast cells, promising the wide applications in the clinical and food analysis fields.
研究领域:
分析化学
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生物医学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xiaowei Liu,Konghu Tian,Zhihong Chen,Chao Zhang,Jing Wang,Jinbo Zhu,Sheng Sun,Lixin Xu
Melamine-derived carbon foam (MDCF) and nickel–cobalt bimetallic nanosheet arrays (NiCo-BNSA) possess unique porous structures and excellent microwave absorption (MA) properties, making them potentially useful in MA applications. In this investigation, we fabricated NiCo-BNSA/reduced graphene oxide/MDCF (NiCo-BNSA/RGO/MDCF) composites utilizing a two-stage synthesis protocol. This process incorporated melamine foam (MF) pretreatment, carbonization, and a subsequent in-situ growth stage, resulting in the creation of a three-dimensional porous network structure. By adjusting the RGO volume, we were able to manipulate the structure and composition of the NiCo-BNSA/RGO/MDCF composites, leading to an enhancement in their MA performance. It was also observed that the NiCo-BNSA was evenly distributed on the surface of both the RGO and MDCF . The composites exhibited an optimal reflection loss ( RL min ) of −67.8 dB at a thickness of 2.50 mm, and by varying their thickness, the effective absorption bandwidth (EAB, RL ≤ -10 dB) extended to 9.80 GHz, encompassing the entire C and X bands. This study presents a novel approach for fabricating lightweight and efficient carbon-based MA composites.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Xinqi Wang,Lijiu Cao,Yue Hu,Yufang Chen,Tao Jin,Jian Huang,Xinhe Zhang,Shudong Lin
In recent years, the application of highly transparent hydrophobic coatings for anti-smudge of electronic displays, automotive glass surfaces, and solar cell surfaces has attracted significant attention. Melamine-formaldehyde (MF) resin has high transparency and hardness, but due to its own brittleness , there are still some research gaps in the application of high transparent hydrophobic coatings. In this work, a novel hydrophobic melamine was prepared by modifying melamine with stearyl chloride. Based on the hydrophobic melamine and alcohol modifier, a novel MF resin was prepared, which was used to fabricate high-transparency hydrophobic coatings. Long-chain alkyl materials offered low surface free energy property, and polyethylene glycol was introduced to improve the flexibility of MF resins. Therefore, the novel melamine resin coating has the performance advantages of high transparency (>95 %), high hardness (8H), high toughness (1 mm), high gloss, excellent abrasion resistance and hydrophobicity (water contact angle 104°), as well as good self-cleaning ability. This research has important enlightening significance for promoting the application progress of melamine resin in the field of coating.
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
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2012
·
IF 2.545
Wei Feng,Changyin Lv,Liping Yang,Jianlin Cheng,Chengyan Yan
Melamine, a basic organic chemical intermediate, can cause renal failure because of the formation of insoluble melamine cyanurate crystals in the kidneys. This study examined a novel fluorescence spectrometry for the determination of trace melamine in dairy. The method was based on the inhibitory effect of melamine on the decolorizing reaction of the uncatalytic oxidation of acridine red by potassium permanganate in a sulfuric acid medium. The calibration graph was linear for melamine concentrations of 2.1 × 10 −4 –1.6 mg/L, and a detection limit of 61.5 ng/L was obtained. The melamine was determined in dairy samples by the proposed method after liquid–liquid and solid phase extraction. The results correlated with the high-performance liquid chromatography. The recoveries were within the range of 99.6–103.3% for liquid milk and 98.5–111.1% for milk powder. The possible mechanism of the reaction was also investigated by ultraviolet spectra.
研究领域:
分析化学
·
食品安全
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CONTROL
·
2018
·
IF 3.667
Xueqi Leng,Yuqin Tu,Yunping Wu,Yu Wang,Su Liu,Qianqian Pei,Xuejun Cui,Jiadong Huang
A fluorescence sensing strategy was described for the determination of melamine with ultrasensitivity and high specificity. This strategy relies on the combination of proximity ligation assay (PLA)-modulated thymine–melamine–thymine (T–melamine–T) triplex structure along with exonuclease III (Exo III)-aided recycling amplification. The reaction system involves three DNA probes (poly A, tDNA and molecular beacon (MB)). Probe ploy A is an adenine enriched sequence containing an apurinic/apyrimidinic site (AP site). It can provide a hydrophobic vacancy for specially recognizing melamine to bind the nucleobase through pseudo-base pairing and participate in PLA modulated T-melamine-T triplex structure. Probe tDNA can form T-melamine-T with probe poly A via PLA only in the presence of melamine. Probe MB is modified with a fluorophore at its 5′-terminus and a quencher at an internal position, which can self-hybridize to form a hairpin structure, positioning the fluorophore in close proximity to the quencher. Therefore, the binding of MB did not yield any fluorescence signal. However, in the presence of melamine, a T-melamine-T triplex structure is formed through PLA. Probe MB can hybridize with t T-melamine-T triplex structure to yield a substrate for interaction with Exo III. As a result, the T-melamine-T triplex structure is released. Next, the released T-melamine-T triplex structure will hybridize with another MB probe to achieve the Exo III-aided recycle amplification. This is the first example of PLA-modulated T-melamine-T triplex structure coupled with Exo III-aided recycling amplification. Under optimal conditions, the assay has a detection range over 4 orders of magnitude and a limit of detection of 4.4 nM. Moreover, the assay is rapid, simple and inexpensive. Hence, the strategy may open new avenues for ultrasensitive and highly specific detection of melamine encounted in food analysis .
研究领域:
分析化学
·
食品科学
·
分子生物学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2021
·
IF 6.057
Kun Ge,Yuling Hu,Yanjie Zheng,Peichun Jiang,Gongke Li
The analysis of contaminants in migration of food contact material (FCMs) is an urgent demand for food safety. In this study, melamine and formaldehyde in melamine kitchenware were selectively analyzed by surface-enhanced Raman scattering (SERS) via aptamer/derivatization-based membrane assembly. The membrane assembly was designed by simple filtration of Ag nanoparticles-decorated “stellate” silicon dioxide (SiO 2 /Ag) and composites of reduced graphene oxide and Ag nanoparticles (rGO/Ag) functioned with specific reagents. High selectivity can be realized by melamine aptamer and derivatization reagent of formaldehyde, respectively. The relative standard deviations (RSDs) of melamine and formaldehyde analysis for 11 replicate measurements, 14 consecutive days and 25 batches are less than 6.0 %, which shows excellent repeatability and reproducibility. After the method was validated, the limits of detection (LOD) for melamine and formaldehyde are 0.15 mg/L and 0.21 mg/L, respectively. The developed method was applied to determine the content of melamine and formaldehyde in migration of melamine kitchenware with low relative errors (less than 5.3 %) compared to chromatographic results. The recoveries of melamine and formaldehyde for migrations of melamine kitchenware are 91.2–110.0 % and 94.0–106.0 % with RSDs in range of 1.8–8.3 % and 4.7–9.1 %, respectively. The method proposed a new concept of convenient, portable and reliable strategy for analysis of melamine and formaldehyde in migration from FCMs.
研究领域:
分析化学
·
食品安全
·
材料科学
·
光谱学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Alemtsehay Tesfay Reda,Dongxiang Zhang,Xiyan Xu
The search for efficient material to capture iodine from off-gas streams continues. Herein, a novel composite of lithium aluminate and melamine , abbreviated as LiAlO 2 -Mel, was synthesized and exhibited high vapor iodine capture capacity accompanied by good regeneration ability. The LiAlO 2 -Mel showed an enormous capture capacity of 1281 mg/g within 4 h towards I 2 (g) at 150 °C. The kinetics study showed that the dominant process (at 150 °C) was chemisorption via N∙∙∙I and C–NH∙∙∙I bonding mechanisms. Additionally, LiAlO 2 -Mel has a low surface area (14.6157 m 2 /g) yet produced high capacity, suggesting chemisorption played a critical role. However, physisorption was the dominant process at lower temperature values, as proved by kinetics fittings and activation energy (E a = 23.19 KJ/mol) studies. The kinetics models were validated by statistical error validity models (sum of square error, Chi-square test, and normalized standard deviation). Thermogravimetric analysis and adsorption-desorption experiments showed that the LiAlO 2 -Mel can be recovered by heat treatment (25–800 °C) in N 2 atmosphere and ethanol washout (24 h, 25 °C) of the LiAlO 2 -Mel-I. The high capture capacity, along with eco-friendly and cost-effectiveness, highlights the promising potential of LiAlO 2 -Mel for iodine capture.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 28
·11486-11499
·
IF 4.5
Jiang Yanxiao,Song Wei,Zhang Meng,Feng Yu,Liu Boyan,Zhang Hong,Kan Guangfeng,Yu Kai,Jiang Jie
In this study, metal–organic framework (MOF)-functionalized sponge columns were prepared using a simple approach by embedding melamine sponge in a homogeneous MOF solution and first applied in the removal of methyl orange dye from water samples. Various MOF materials (MIL-101(Cr), MIL-101(Fe), ZIF-8(Zn), HKUST-1(Cu), and MIL-68(Al)) with different structures were synthesized and used as coating materials for a blank sponge. This method not only can be used for a wide variety of MOF materials, but also can retain their unique properties. The results show that the sponge as an adsorbed base material can effectively simplify the separation procedures of adsorption. Under the optimal conditions, the prepared MOF/PVDF-sponge column had an excellent adsorption capacity (229.4 mg g −1 ) toward methyl orange and reached the equilibrium within 1 h. With simple one-step infiltration, excellent adsorption properties and simple operation, the MOF/PVDF-sponge column presents a promising commercial value. Moreover, this study provides a new approach for exploring functional porous sponges for adsorption of dyes from environmental water samples.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2012
·
IF 3.794
Bowan Wu,Zhihua Wang,Dongxia Zhao,Xiaoquan Lu
A novel molecularly imprinted (MIP) impedimetric sensor was promoted for selective detecting melamine (MEL). The Au electrode modified with MIP poly (2-mercaptobenzimidazole) (PMBI) was prepared by electrochemical polymerization of 2-mercaptobenzimidazole (2-MBI) with cyclic voltammetry (CV) in the presence of template molecule MEL. The surface morphology and structure of MIP PMBI are characterized by atomic force microscopy (AFM), infrared spectra (IR), electrochemical impedance spectroscopy (EIS), and CV. The main driving force of recognition is the π-donor–acceptor interaction between MEL and PMBI. The imprinted electrode could avoid the interference successfully. In addition, a linear response curve was obtained from 1.0×10 −8 M to 5.0×10 −5 M, with the detection limit of 3.0×10 −9 M. The sensor exhibits remarkable advantages, such as higher sensitivity, wider linear range and lower detection limit. The effective method has a potential application to monitor nonelectrochemically active substances in food analysis in the future.
研究领域:
分析化学
·
食品安全检测
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）