POLYMER ENGINEERING AND SCIENCE
·
2024
·Vol. 64
·期 7
·3137-3146
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IF 3.2
Menghua Ma,Qixiang Yang,Tiantian Meng,Yuxin Wei,Yi Pan,Rui Chen
A new fire retardency APD was synthesized successfully by the condensation between 2-aminopyrazine and DOPO, and target product APD was characterized by NMR. Absorption peak at 12.6 ppm in 31 P NMR verified complete consumption of the reactant DOPO and further confirmed the structure of APD. The safety of epoxy resin (EP) in fire disaster was dramatically improved by introduction of APD. Epoxy resin modified with 8% APD succeeded in vertical burning (UL-94) test with V-0 rating and limited oxygen index (LOI) of EP/8% APD was also improved to 33.9%. Cone calorimeter (CC) test further exhibited fire resistant effect of APD on EP in detail. 11.0 g APD reduced total heat release of 100 g EP to 35.1% and reduced total smoke product of 100 g EP to 19.9%. Char residue from CC test of EP/8% APD was analyzed by Raman, XPS, SEM, and FTIR tests. The results of these tests indicated that compact morphology of char residue from EP/8% APD possessed a positive effect in blocking fire spread. Highlights APD was synthesized and fire resistant EP was made. EP/APD acquired outstanding fire resistance and moderate mechanical properties. APD played fire resistant role in gas phase and condensed phase.
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
Advanced Materials Technologies
·
2024
·Vol. 9
·期 9
·2302029
·
IF 6.4
Can Gao,Xinyao Wang,Qingyun Yang,Xiaochun Wang,Chunxiao Gao,Xizhe Liu
Hybrid tin halides with formamidinium cations become a promising candidate for eco-friendly solar cells, which achieves the best photovoltaic performance among various lead-free perovskite solar cells (PSCs). Unfortunately, the low quality of perovskite layers and the oxidation of Sn 2+ ions degrade the performance of devices, leading to an obviously lower power conversion efficiency (PCE) compare to hybrid lead halides. Additive engineering is a facile strategy for improving the quality of perovskite layers. In this work, the 2-aminopyrazine (APZ) additive is investigated for depositing FA 0.8 PEA 0.2 SnI 2.8 Br 0.2 layers, and corresponding PSCs are examined. It is found that the melting point of APZ additives drops below the annealing temperature of perovskite layers by the intermolecular interaction with formamidinium iodide (FAI). The melt phase at the grain boundaries encourages the diffusion of ions in the annealing process, leading to an improved quality of perovskite layers. And the formation of APZ-SnI 2 complex also inhibits the oxidation of Sn 2+ ions. Consequently, the defect density and the recombination are significantly reduced in PSCs, resulting in an increase of PCEs from 11.4% to 13.0% and a simultaneous improvement of device stability. This work demonstrates a strategy for improving tin-based PSCs based on melt assisted annealing and coordination interaction.
研究领域:
材料科学
·
可再生能源
·
太阳能电池技术
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2025
·
IF 2.2
Qi Yang,Zhao Wang,Li Yang,Yue Zhu,Han Cao,Yao Wu
An abnormal level of well-known his-rich protein, hemoglobin is related to various diseases. Efficient isolation of hemoglobin is of great significance in early disease diagnosis and biomedical analyses. Developing high-performance adsorption materials has become a research hotspot at present. This study proposes a facile pyrolysis-based strategy to prepare novel magnetic flower-like composites for selective hemoglobin separation. Methoxy-polyethylene glycol-carboxyl (PEG) can impart adhesion resistance to improve adsorption selectivity due to its unique ethylene oxide groups and the repulsive elastic forces from compression of the brush-like chains. Two types of magnetic composites were constructed from bimetallic metal-organic frameworks utilizing Co2+ and Ni2+ ions as magnetic sources and metal nodes, as well as modification with or without PEG. The properties of the two composites were demonstrated via FTIR, SEM, TEM, DLS, XPS, TGA, BET, and VSM analyses, including flower-like morphology, uniform size (~2 μm), good dispersibility, porous structure, large surface area, and good magnetic responsiveness. The protein adsorption capacity was further investigated from material factor including the composites modified with/without PEG and environmental factors including incubation time, protein concentration and incubation temperature. Moreover, the adsorption behaviors were explored by kinetics and thermodynamic analysis. Both the PEG-modified and non-PEG-modified composites were effective magnetic adsorbents for selective hemoglobin separation, besides exhibited different adsorption mechanism due to introduction of PEG which induced non-spontaneous selective adsorption rather than spontaneous pure physical adsorption. The magnetic bimetallic MOF system shows promise for isolating His-rich proteins from complex biological systems.
研究领域:
生物医学工程
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材料科学
·
蛋白质组学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Hongmei Chen,Yanyun Fan,Kexin Shi,Peng Wang,Chong-Chen Wang
It is of great significance to develop an efficient and stable photocatalyst for the photocatalytic decomposition of water to produce hydrogen. Within this paper, an effective and simple strategy was adopted to introduce pyrazine ring into graphite-like carbon nitride framework to realize efficient and stable hydrogen production process. After evaluation, the hydrogen production efficiency of the modified semiconductor material is 3.05 folds higher than the unmodified graphite-like phase carbon nitride, and an excellent stability performance was also achieved. It is proved that the light absorption ability of doped semiconductor composite nanomaterials was enhanced markedly by introducing 2-aminopyrazine into the carbon nitride structure. Meanwhile, the segregation efficiency of photo-induced carriers was obviously accelerated because the amino groups can work as hole trapping agents. Additionally, the introduced amino groups own Lewis alkalinity, which is in favour of the photoreduction. This work expands a new perspective of stable photocatalysts in the water split to produce hydrogen.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2019
·Vol. 30
·期 9
·2331-2339
·
IF 2.162
Hao Tang,ZongMin Zhu,Rui Chen,JunJie Wang,Hong Zhou
A novel DOPO-based pyrazine derivative 6-((2-hydroxyphenyl)(pyrazin-2-ylamino)methyl)dibenzo[c,e][1,2]oxaphosphinine 6-oxide (DHBAP) was triumphantly synthesized by a two-step addition reaction using 2-aminopyrazine, 2-hydroxybenzaldehyde and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) as reactants, and characterized by Fourier-transform infrared (FTIR), 31 P nuclear magnetic resonance (NMR) and 1 H NMR. Afterwards, the addition type flame retardant (DHBAP) was utilized to modify epoxy resin (EP) by blending method. When the content of DHBAP in neat EP was 8 wt%, it reached to the V-0 rating and the limited oxygen index (LOI) value up to 34.0%. Furthermore, according to the cone calorimeter (CC) test results, the heat release rate (HRR), total heat release (THR), smoke produce rate (SPR) and total smoke production (TSP) of EP/8% DHBAP decreased by 26.3%, 21.3%, 37.0% and 60.9% when compared with neat EP, respectively, indicating that DHBAP had good inhibition on heat and smoke releases. Eventually, the flame-retardant mechanism of DHBAP was further explored by X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). The results showed that DHBAP had good flame-retardant activity in the gasous-condensed two phases.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2023
·Vol. 10
·期 12
·2202524
·
IF 5.4
Lei Wang,Xianying Bai,Yawei Gu,Xinxin Shi,Shilong Wang,Jingxian Hua,Rujing Hou,Chongqing Wang,Yichang Pan
2D metal–organic frameworks are attractive filler in mixed matrix membranes (MMMs) due to the high aspect ratio and contact opportunity at the filler–polymer interface. However, their alignment in polymer matrix remains a challenge to fully play their functions. Herein, to our best knowledge, for the first time, the facile synthesis of KAUST-7-NH 2 (KAUST, King University of Science and Technology) nanoplate is reported with 1D channels with an aspect ratio greater than 30. The nanoplates are incorporated and aligned in the 4,4′-(hexafluoroisopropylidene) diphthalic anhydride-2,4-diaminomesitylene (6FDA-DAM) polymer matrix under the shear force with a filler loading up to 50 wt%. The large difference in adsorption abilities between CO 2 and CH 4 from the (001)-oriented KAUST-7-NH 2 nanoplate-based MMMs and the favorable interaction at the filler–polymer interface contribute to the excellent CO 2 /CH 4 separation performance. The resultant membranes show CO 2 /CH 4 selectivity with 66.2% enhancement (surpassed 2008 Robeson upper bound), antiplasticization up to 17 bar, and long-term stability up to 240 h indicating its good potential for natural gas treatment.
研究领域:
材料科学
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化学工程
·
环境科学
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2018
·
IF 2.88
Huan Yang,Li He,Shuang Pan,Hui Liu,Xiaoli Hu
Herein, a facile approach for highly sensitive and selective detection of tannic acid (TA) was proposed with the nitrogen-doped fluorescent carbon dots (NCDs) as a novel fluorescent probe , using sodium citrate and aminopyrazine as precursors. The as-synthesized NCDs exhibited multiple advantages including high quantum yield (11.8%), good water solubility and satisfactory stability. In addition, the NCDs displayed excitation-independent emission behavior with fluorescence emission peak remaining at 389 nm under excitation of 270–350 nm. Significantly, the fluorescence quenching of as-fabricated NCDs was observed with the increasing TA concentration, and the calibration curve displayed a wide linear region ranging from 0.40 to 9.0 μmol L −1 with a detection limit of 0.12 μmol L −1 . This fluorescent probe also performed well in determining TA in beer samples with average recoveries of TA ranging from 96.1% to 104.4% and the relative standard deviation less than 5%, which provided a reliable, rapid and simple method to determine TA in real samples. Thus, this method offered a valuable insight for its practical applications.
研究领域:
分析化学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2019
·Vol. 31
·期 4
·885-897
·
IF 2.162
Hao Tang,Hong Zhou
In this work, a novel nitrogen, phosphorus and boron ionic pair compound (DTPA[AZB]), composed of a protonated flame retardant (DTPA) 6,6'-(1,4-phenylenebis((pyrazin-2-ylamino)methylene))bis(dibenzo[c,e][1,2]oxaphosphinine 6-oxide) and a counter anion alizarin borate (AZB), has been prepared and fully characterized, AZB was synthesized by the reaction of alizarin with boric acid. DTPA was produced in two steps. First, terephthalaldehyde was condensed with aminopyrazine to form the corresponding imine. This was treated with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) to generate DTPA. Blending with DTPA greatly reduced the flammability of epoxy resin. When the amount of DTPA added was 4%, a modified epoxy resin passed the V-0 rating and the limiting oxygen index (LOI) reached 32.5%. With the introduction of 3% AZB into the EP/DTPA material, the LOI reached 33.5%. Simultaneously, compared with that of neat EP, the peak heat release rate and smoke production rate for EP/DTPA-4 was decreased by 24.1% and 40.7%, respectively, and the peak heat release rate and smoke production rate for EP/DTPA[AZB]-3 was decreased by 32.9% and 43.4%, respectively. The results indicate that AZB and DTPA show good cooperative flame retardant effects. The flame retardancy of the modified epoxy is improved with greater heat release suppression combustion of the resin. A mode of flame retardant action has been proposed based on analysis results from Py-GC/MS for DTPA, and SEM, IR and Raman for the residual carbon from cone calorimeter and UL-94 tests, respectively. Importantly, the tensile strength, fexural strength, and fexural modulus of the EP/DTPA[AZB] increased compared with the same properties of neat EP.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 41
·e54513
·
IF 3
Boyu Cai,Qing Jiang,Wendi Xu,Luze Wang,Zhonglin Luo,Biaobing Wang
A nitrogen-rich DOPO-based phosphoramide (DPAPZ) was synthesized using aminopyrazine and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) as raw materials, and blended with polycarbonate (PC) through melting method. The chemical structure of DPAPZ was validated by FTIR, 1 H NMR and 31 P NMR. The presence of DPAPZ endowed PC/DPAPZ composites with better fire safety and smoke suppression. With the incorporation of 6 wt% DPAPZ, PC/DPAPZ-6 composite reached UL-94 V-0 rating and 30.2% of limiting oxygen index value. Simultaneously, the peak of heat release rate and total heat release of PC/DPAPZ-6 were reduced by 44.8% and 47.0% as compared with the pure PC, respectively. The DPAPZ displayed bi-phase flame retardant roles. In the gas phase, the decomposition of DPAPZ released phosphorus-containing free radicals acting as the quencher of reactive H·/OH· and nonflammable NH 3 diluting O 2 /combustible volatiles. In the condensed phase, the phosphorus-containing components were dehydrated into metaphosphoric acid or polymetaphosphate covering the surface to protect the PC matrix from further combustion, and to promote the formation of a dense carbon layer to interrupt the transmission of O 2 and volatiles between the combustion zone and the inner. The tensile strength of the composites displayed almost no change but the elongation at break decreased slightly with the addition of DPAPZ.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Huahao Wang,Yaping Ding,Mengjia Ning,Miao Yu,Wenji Zheng,Xuehua Ruan,Yuan Xi,Yan Dai,Hongjing Liu,Gaohong He
Metal organic frameworks (MOFs) with appropriate pore size and sufficient CO 2 -philic groups are required to improve the mixed matrix membranes (MMMs)-based CO 2 capture. Herein, NH 2 -CPL-1 is designed for capture by utilizing amino pyrazine instead of pyrazine in CPL-1. The introduced CO 2 -philic amino groups together with rich hydroxyl and carboxyl groups in CPL-1 could improve the selective adsorption of CO 2 , enhancing the solubility selectivity. At the meantime, after the introduction of amino-functional, the pore size of NH 2 -CPL-1 is decreased from 0.93 nm of CPL-1 to 0.85 nm, which is beneficial for the screening of CO 2 over N 2 . As a result, the CO 2 separation performances of MMMs could be promoted greatly under the action of NH 2 -CPL-1. MMM with NH 2 -CPL-1 of 10 wt.% exhibited the best CO 2 separation performance, with CO 2 /N 2 selectivity of 85 and CO 2 permeability of 104 Barrer at 25 °C and 0.4 MPa. Compared with the CPL-1/Pebax-10 wt.% MMM, it was increased by 9.5 % and 13.3 %, respectively. This satisfactory CO 2 separation performance surpasses those of most reported other MOFs based MMMs, which is attributed to the facilitated CO 2 transport and pore size screening from the introduced amino groups. This is also confirmed by the improvement of diffusion selectivity and solution selectivity. The proposed NH 2 -CPL-1 shows great prospect as filler for enhanced MMMs-based CO 2 capture.
研究领域:
材料科学
·
环境工程
✓ 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）