JOURNAL OF HETEROCYCLIC CHEMISTRY
·
2022
·Vol. 59
·期 9
·1561-1572
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IF 2.035
Ling Jiang,Si-Yu Yan,Jing-Wen Dong,Li-Dan Ye,Yue Cheng,Xiao-He Chu
A series of polysubstituted pyrroles were rapidly synthesized in moderate to good yields via catalyst-free one-pot three-component reaction of 1,3-dicarbonyl compounds with primary amines and nitrostyrenes by using liquid-assisted grinding. This protocol provides several advantages over the conventional chemical synthesis, such as simple work-up procedure, wide substrate scope, short reaction time, and environmental friendliness. Structures of polysubstituted pyrroles were confirmed by 1 H NMR, 13 C NMR, and ESI-MS studies.
研究领域:
有机化学
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药物化学
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绿色化学
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合成方法学
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杂环化学
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DOI
高影响因子
Materials Today Communications
·
2020
·
IF 2.678
Ting Zhang,Chunli Jiang,Rong Luo,Ruijuan Qi,Mengqin Liu,Chunhua Luo,Hechun Lin,Hui Peng
Luminescent (trimethylbromomethyl) ammonium lead tribromide ((TMBM)PbBr 3 ) nanocrystals are synthesized by a green single-step mechano-grinding method in large scale. The photoluminescence quantum yield (PL QY) of the obtained (TMBM)PbBr 3 nanocrystals is 2.61 %. The luminescence of the nanocrystals can be significantly enhanced by introducing water or methanol during the grinding process. The maximum PL QYs of 7.65 % and 4.69 % are obtained for the nanocrystals prepared by the addition of water and methanol, respectively. The emission light of (TMBM)PbBr 3 nanocrystals can be tuned by the doping of chloride ion.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 8
·3400
·
IF 4.6
Pengzhan Liu,Tianshun Yuan,Jin Peng,Wenjun Zou,Furen Xiao
A scheme for manufacturing heavy-duty rail grinding wheels with silicone-modified phenolic resin (SMPR) as a binder in the field of rail grinding is presented to improve the performance of grinding wheels. To optimize the heat resistance and mechanical performance of rail grinding wheels, an SMPR for industrial production of rail grinding wheels was prepared in a two-step reaction using methyl-trimethoxy-silane (MTMS) as the organosilicon modifier by guiding the occurrence of the transesterification and addition polymerization reactions. The effect of MTMS concentration on the performance of silicone-modified phenolic resin for application in rail grinding wheels was investigated. The molecular structure, thermal stability, bending strength, and impact strength values of the SMPR were characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and mechanical property testing, and the effect of MTMS content on the resin properties was investigated. The results indicated that MTMS successfully improved the performance of the phenolic resin. The thermogravimetric weight loss temperature of the SMPR modified by MTMS with 40% phenol mass at 30% weight loss is 66% higher than that of common phenolic resin (UMPR), exhibiting the best thermal stability; in addition, its bending strength and impact strength were enhanced by approximately 14% and 6%, respectively, compared with those of common UMPR. This study utilized an innovative Bronsted acid as a catalyst and simplified several intermediate reactions in the conventional silicone-modified phenolic resin technology. This new investigation of the synthesis process decreases the manufacturing cost of the SMPR, liberates it from the restrictions of grinding applications, and enables the SMPR to maximize its performance in the rail grinding industry. This study serves as a reference for future work on resin binders for grinding wheels and the development of rail grinding wheel manufacturing technology.Keywords:silicone-modified;phenolic resin;rail grinding wheel;methyl-trimethoxy-silane;preparation;resin performance
研究领域:
材料科学
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化学工程
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机械工程
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产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Fujie Wang,Qi Wang,Shuangqiao Yang
Epoxy resin (EP) is a widely used thermosetting resin. However, its cross-linked structure poses a big challenge for recycling into value-added products. This study advanced the recycling of acid anhydride-cured epoxy using solid-state shear milling (S3M) technology. Through this process, the C–C backbone and C–O cross-linking bonds in epoxy resins were destroyed, generating C═O and −OH reactive groups in the reactive epoxy resin powder (REP). When REP-20 (number of milling cycles) is incorporated as an active filler into the original curing system, the tensile strength of the epoxy resin increased from 34.2 to 51.6 MPa, and the flexural strength increased from 57.1 to 82.3 MPa, which were 50.1 and 44.1% enhancement, respectively, compared to REP-1. Futhermore, REP powder can serve as an active filler into epoxy resin with other curing agents, such as curing agent 593 and 4,4-Diaminodiphenylmethane (DDM). By employing REP powder to enhance surface roughness in hydrophobic coating, a contact angle increased 144.1°. Additionally, when REP was utilized in a filter column, it effectively separated water and oil with a separation efficiency of up to 99%. After 10 cycles of operation, the flux and filtration efficiency of the devices remained unchanged, demonstrating excellent stability and reusability. This study provided a new way to recycle thermosetting resins to produce value-added functional fillers for applications such as hydrophobic coatings and oil–water separation.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Wei Zhao,Zilu Liu,Song Yang,Na Xu,Xiaokun Li,Gan Luo,Zhenjiang Wu,Shoujun Liu,Chao Yang
An aqueous carbon black slurry was prepared by esterifying polystyrene-maleic anhydride with isobutanol as the esterifying agent and using the esterified product as a dispersant for carbon black. The effects of grinding time and dispersant addition on the ground particle size of carbon black before and after the esterification modification were investigated, as well as the effect of SMA dispersant on the dispersion stability of carbon black. The carbon black slurry was investigated by introducing external conditions such as temperature and pH, and the microscopic dispersion of the ink was observed by SEM. The results showed that the dispersion effect of the isobutanol-modified SMA was stronger than that of the unmodified SMA, the particle size of the carbon black paste reached 84 nm with the best stability when the dispersant was added at 4 % and the grinding time was 120 min. FTIR and XRD results showed that the surface groups of the carbon black interacted with the groups of the dispersant to achieve dispersion stability. This study not only provides directions for the selection of dispersant for carbon black in new aqueous media but also confirms the practicality of black colour pastes in gel inks and provides a theoretical reference for the development of pigment-based gel inks.
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
Food Science and Human Wellness
·
2024
·
IF 5.6
Yuan Yuan,Shun Zhong,Zeyuan Deng,Guangyan Li,Jinwu Zhang,Hongyan Li
The nutrient digestion, absorption and biological activity of bee pollen may be limited due to the complex pollen wall. Here, the effect of superfine grinding technology on the release of nutrients from bee pollen were investigated, and their antioxidant activities and in vitro digestion were explored in this study. Results showed that the content of nutrients in bee pollen increased after wall disruption. Among them, fat content increased by 22.55 %–8.31 %, protein content increased by 0.54 %–4.91 %, starch content increased by 36.31 %–48.64 %, soluble sugar content increased by 20.57 %–29.67 %, total phenolic acid content increased by 11.73 %–86.98 % and total flavonoids content increased by 14.29 %–24.79 %. At the same time, the antioxidant activity increased by 14.84 %–46.00 %. Furthermore, the active components such as phenolic compounds in the wall-disruption bee pollen were more readily to be released during the in vitro digestion, and easier to be absorbed because of their higher bioaccessibility. Antioxidant activities during in vitro digestion were also improved in wall-disruption bee pollen. These findings provide evidence that bee pollen wall disruption was suggested, thus, it is more conducive to exerting the value of bee pollen in functional foods.
研究领域:
食品科学
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营养学
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生物化学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Biqi Tang,Jiayi Sun,Jie Xiao,Yong Cao,Qingrong Huang,Chi-Tang Ho,Xingran Kou,Muwen Lu
Piperine (PIP) has been known for its pharmacological activities with low water solubility and poor dissolution, which limits its nutritional application. The purpose of this research was to enhance PIP stability, dispersibility and biological activity by preparing PIP nanoparticles using the wet-media milling approach combined with nanosuspension solidification methods of spray/freeze drying. Octenyl succinic anhydride (OSA)-modified waxy maize starch was applied as the stabilizer to suppress aggregation of PIP nanoparticles. The particle size, redispersibility, storage stability and in vitro release behavior of PIP nanoparticles were measured. The regulating effect on adipocyte differentiation was evaluated using 3T3-L1 cell model. Results showed that PIP nanoparticles had a reduced particle size of 60 ± 1 nm, increased release rate in the simulated gastric (SGF) and intestinal fluids (SIF) and enhanced inhibition effect on adipogenesis in 3T3-L1 cells compared with free PIP, indicating that PIP-loaded nanoparticles with improved stability and anti-adipogenic property were developed successfully by combining wet-media milling and drying methods.
研究领域:
药学
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纳米技术
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生物技术
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细胞生物学
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产品关联
DOI
PubMed
高影响因子
Catalysts
·
2024
·Vol. 14
·期 5
·332
·
IF 3.8
Xiongxiong Zuo,Xing Tang
The catalytic isomerization of glucose to fructose plays a pivotal role in the application of biomass as a feedstock for chemicals. Herein, we propose a facile solid-state-grinding strategy to construct ZrO2/MgO mixed oxides, which offered an excellent fructose yield of over 34.55% and a high selectivity of 80.52% (80 °C, 2 h). The co-mingling of amphiphilic ZrO2with MgO improved the unfavorable moderate/strongly basic site distribution on MgO, which can prohibit the side reactions during the reaction and enhance the fructose selectivity. Based on the catalyst characterizations, MgO was deposited on the ZrO2surface by plugging the pores, and the addition of ZrO2lessened the quantity of strongly basic sites of MgO. Additionally, the presence of ZrO2largely enhanced the catalyst stability in comparison with pure MgO by recycling experiments.
研究领域:
生物化学
·
催化化学
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Yuxuan Liu,Zhongchen Lu,Jie Cui,Hui Liu,Jun Liu,Renzong Hu,Min Zhu
Poor reversibility of conversion and alloying reactions for Sb 2 S 3 limits its application as high capacity anode for rechargeable lithium storage. Herein a facile high-efficiency plasma assisted milling (P-milling) was used to create Sb 2 S 3 -C hybrid nanostructure with disk-like Sb 2 S 3 nanograins wrapped within ultrathin graphite nanosheets . Benefiting from the high structure stability and excellent Li + ion diffusion kinetics in the graphite wrapped Sb 2 S 3 nanostructure , highly reversible conversion and alloying reactions are maintained throughout the long-term cycles. The Sb 2 S 3 -C nanocomposite anode demonstrates a high stable capacity of 638.2 mA h g −1 after 250 cycles at 200 mA g −1 between 0.01 and 3.0 V vs. Li/Li + , with a high initial Coulombic efficiency of 78.3%. A reversible capacity of 496.1 mA h g −1 is obtained after 500 cycles even at higher current rate of 1 A g −1 , much superior to those of the unmilled Sb 2 S 3 -C and P-milled Sb 2 S 3 anodes. These demonstrate that P-milling could be a promising strategy to create high performance metal chalcogenide anode materials involved both conversion and alloying reactions toward lithium storage.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2019
·Vol. 128
·期 2
·1029-1042
·
IF 1.428
Lu Huihui,Duan Weiting,Zhao Xinhong
A cost-effective route has been developed for the synthesis of nano-sized triclinic SAPO-34 zeolite via seed-assisted grinding method using lower dosage of morpholine as the sole template. The synthesis conditions including silica source, silica concentration, crystallization temperature and time were refined to obtain SAPO-34 zeolite with high phase purity and crystallinity. Particularly, seed crystals preactivated by different methods were utilized to induce the synthesis of nano-sized SAPO-34 zeolites in the subsequent study. The resultant SAPO-34 samples were characterized by XRD, SEM, N 2 physisorption and NH 3 -TPD techniques. It was found that the introduction of seed crystals activated by mechanical milling for 20 min and chemical etching with 0.0001 M and 0.01 M H 3 PO 4 can not only effectively reduce the crystal size of SAPO-34 zeolites from 3–4 μm to 500–800 nm level, but also can modify their texture and acid properties. This nano-sized SAPO-34 catalyst exhibits a remarkably prolonged catalytic lifetime in methanol to olefins (MTO) reaction in comparison to the conventional micron-sized counterpart. Analogous to solvent-free synthesis of zeolites, this seed-assisted grinding synthesis method is simpler, more efficient than conventional hydrothermal synthesis. More importantly, this method provides a new avenue for preparing superior MTO catalyst.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2020
·
IF 4.244
Xiuyu Liu,Yan Jiang,Lijun Wang,Xueping Song,Chengrong Qin,Shuangfei Wang
This study explores the possibility of producing tunable cellulose nanofibers (CNFs) with a wide range of size and properties from sugarcane bagasse in an energy-efficient manner, which is very meaningful for specific application of CNFs. The bleached bagasse kraft pulp was subjected to endoglucanase pretreatment with a wide range of enzyme dosage followed by mechanical grinding to obtain size-tunable CNFs. The size distribution and structural characteristics of CNFs, energy consumed during the CNF production process, and properties of CNF films were systematically investigated as a function of the enzyme dosage applied in the pretreatment. The results showed that endoglucanase-assisted mechanical grinding was able to produce CNFs with controllable length (298–4500 nm) and diameter (9–26 nm), meanwhile improving CNF yield and energy-efficiency. The controllable range of CNF length was extremely wide based on our best knowledge. The optical performance and mechanical properties of the prepared CNF films could be effectively tuned by regulating the structural characteristics of the CNFs. Moreover, all the as-prepared CNFs retained high thermal stability. The tailor-made CNFs from sugarcane bagasse are expected to provide compatibility with various CNF-related applications.
研究领域:
材料科学
·
纳米技术
·
生物质转化
·
可再生资源
·
高分子材料
✓ 已验证
DOI
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 1
·327
·
IF 4.927
Hang Xiao,Tao Li,Xiao-Li Sun,Wen-Ming Wan,Hongli Bao,Qingrong Qian,Qinghua Chen
Pyrene molecules containing NBN-doped polycyclic aromatic hydrocarbons (PAHs) have been synthesized by a simple and efficient intermolecular dehydration reaction between 1-pyrenylboronic acid and aromatic diamine. Pyrene-B (o-phenylenediamine) with a five-membered NBN ring and pyrene-B (1,8-diaminonaphthalene) with a six-membered NBN ring show differing luminescence. Pyrene-B (o-phenylenediamine) shows concentration-dependent luminescence and enhanced emission after grinding at solid state. Pyrene-B (1,8-diaminonaphthalene) exhibits a turn-on type luminescence upon fluoride ion addition at lower concentration, as well as concentration-dependent stability. Further potential applications of Pyrene-B (o-phenylenediamine) on artificial light-harvesting film were demonstrated by using commercial NiR dye as acceptor.Keywords:NBN-doped polycyclic aromatic hydrocarbon;grinding enhanced emission;fluoride ion detection;turn-on type luminescent;artificial light-harvesting film
研究领域:
有机化学
·
材料科学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）