INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Shoulu Yang,Zhongwei Wang,Zhu Liu,Ning Ji,Yiqiang Wu
Hybrid wood is a composite with the advantages of both wood and inorganic material. Here, a novel hybrid wood was fabricated from wood and nanospheres by the in-situ assembly of phosphotungstic acid (HPW) and pyridine (PY) at room temperature. The uniformly distributed amphiphilic PY-PW nanospheres provided controllable particle size and acid properties by changing the HPW-PY molar. Examination under Scanning electron microscopy (SEM) showed the presence of a uniform nanosphere coating by the nanospheres, and FE-SEM/EDS showed even distribution on the cell walls. The successful synthesis of the nanospheres in the wood was confirmed by Transmission electron microscopy (TEM). The PY-PW/wood hybrid was also resistant to leaching, attributed to the amphiphilicity of the nanospheres. The hybrid wood also showed superior flame retardation, with a UL-94 V-0 rating, and significantly reduced the peak heat release rate (pk-HRR) and total smoke release (TSR) values of the untreated wood by 44.7 % and 51.7 %, respectively. The enhanced flame retardation was attributed to synergistic effects and catalytic carbon reactions resulting from high-density nitrogen/phosphorus/oxygen cross-linking in the carbon layer in the condensed phase and the removal of combustible gases by free radicals. This hybrid wood material has potential application for the development of fire-safe wood.
研究领域:
材料科学
·
林业工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Junshuai Zhang,Jialong Duan,Qiaoyu Zhang,Qiyao Guo,Furi Yan,Xiya Yang,Yanyan Duan,Qunwei Tang
Intramolecular structure of interfacial passivator highly determines the bond strength with detrimental defects located at perovskite surfaces and grain boundaries. Herein, we investigate the steric-charge-dependence of various π-conjugated pyridine derivatives on electron-donating ability to passivate inorganic CsPbIBr 2 perovskite film. The primary results demonstrate that the photovoltaic performances tightly correlate with the multidentate coordination sites and structure-steric hindrance because of their synergistic regulation on intramolecular electron-cloudy density and charge extraction. Comparing to pyridine and terpyridine treated devices, the bipyridine passivated device delivers an increased efficiency of 11.04% with a high open-circuit voltage of 1.301 V and improved stability after persistent irradiation over 20 h and storage for 60 days, which is one of the highest efficiencies for carbon-based all-inorganic CsPbIBr 2 solar cells. This work provides a direction to choose ideal passivator for high-efficiency perovskite optoelectronics.
研究领域:
材料科学
·
光伏技术
·
有机-无机杂化材料
·
能源材料
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Yu Xian,Dong-Mei Ma,Jian-Hong Liu,Dong-Jin Qian
Viologen (VIO) functionalized nanomaterials and supramolecular systems have attracted much attention because of their well reversible redox properties, unique photo-/electrochromic and radical-rich features that resulting in potential applications in the fields of coloration and memory devices, energy conversion and biomimetic chemistry . Here, a tripodal terpyridyl-viologen (TPyVIO) multidentate ligand was newly synthesized, which was then used as a linker, together with Zn 2+ ion as a connector, to construct Zn-TPyVIO multilayers on the surfaces of nanoZnO particles to produce nanoZnO@(Zn-TPyVIO) n hybrids by a layer-by-layer (LBL) technique. Luminescent emission of nanoZnO semiconductors was largely quenched in the nanoZnO@(Zn-TPyVIO) n hybrids, attributed to a quick electron transfer from the conduction band of excited nanoZnO particles to viologens; this electron transfer process resulted in the formation of colored monovalent viologen radical cations . Reversible redox couple was recorded for the glass carbon electrode modified by the nanohybrids , with the cationic and anionic potentials at approximately − 0.78–− 0.84 and − 0.63–−0.73 mV (vs Hg/Hg 2 Cl 2 ), respectively. Finally, it was revealed that the nanoZnO@(Zn-TPyVIO) n hybrids displayed well photochromic behaviors under light radiation.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLUTION CHEMISTRY
·
2023
·Vol. 52
·期 8
·921-939
·
IF 1.2
Guo Qiang,Lin Jinyuan,Yang Pengju,Jiang Yong,Zhang Binchuan,Zhu Longxin,Wang Xunqiu
Isobaric vapor–liquid equilibrium (VLE) data for 2-methylpyridine + 2-vinylpyridine binary systems have been measured using a dynamic circulation device with the pressure points 1.9 kPa, 4.0 kPa, and 5.3 kPa at temperature in the range from 302.8 to 348.5 K. The VLE data passed the thermodynamic consistency test by using L–W method, R–K method and Fredenslund method. The NRTL, Wilson and UNIQUAC models were used to fit the data and binary interaction parameters were obtained for the three models. For these models, the results showed that the calculated values of the model were in good agreement with the experimental values and could, thereby, be used for the design and optimization of distillation.
研究领域:
化学工程
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
STAR Protocols
·
2022
·
IF 0
Cong Niu,Jianjing Yang,Kelu Yan,Jiafang Xie,Wei Jiang,Bingwen Li,Jiangwei Wen
Here, we present a protocol to decyanopyridate inert N-heterocycles access to N-fused heterocycles via the mechanism of dual proton-coupled electron transfer (PCET). We describe a detailed guide to performing an electrochemical gram-scale protocol for decyanopyridation of inert N-heterocycles. The desired pyridylated quinolone is synthesized in a 5.0 mmol scale with a yield of 76%. The protocol is limited to cyanopyridines. For complete details on the use and execution of this protocol, please refer to Niu et al. (2022) .
研究领域:
有机化学
·
电化学
·
合成化学
✓ 已验证
DOI
PubMed
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
·
2021
·
IF 4.32
Yang Mu,Fuyin Zhang,Ning Li,Shanshan Pi,Ang Li,Qing Hong,Jian He,Jiguo Qiu,Jiandong Jiang
Dipicolinic acid (DPA) is a widely distributed pyridine derivative containing two carboxylate groups. However, the catabolism of DPA mediated by microorganisms are rarely reported. Alcaligenes faecalis strain JQ135, previously isolated in our lab, was able to degrade various pyridine derivatives, including nicotinic acid (NA). In this study, it was found that strain JQ135 could utilize DPA as the sole carbon and nitrogen source for growth and degrade 1.8 mM (300 mg/L) DPA to a non-detectable level within 12 h. The catabolism of DPA by strain JQ135 extracted two intermediates, i.e., 3-hydroxy-2,6-dipicolinic acid and 4-imino-pent-2-enedioic acid. Moreover, deletion of the key genes essential for NA catabolism (such as moaCDEBmoeA and maiA ) did not affect DPA catabolism, indicating that the maleamate pathway and molybdenum cofactor are not involved in the DPA catabolism by strain JQ135. This study will provide insights into the bacterial catabolism of DPA.
研究领域:
微生物学
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环境科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2012
·
IF 3.248
Cun Zhang,Xiaoyu Pan,Feng Wang,Xiaoqin Liu
The Brönsted acidic ionic liquids N-carboxymethylpyridine hydrosulphate ([CH 2 COOHPy][HSO 4 ]) and N-carboxyethylpyridine hydrosulphate ([(CH 2 ) 2 COOHPy][HSO 4 ]) were synthesized and used as the extractant and catalyst for the extraction–oxidation desulfurization of model oil. The structures of the ILs were confirmed by 1 H NMR and 13 C NMR. The density, viscosity and acid strength of the ILs were also investigated. The acid strength was in order of H 2 SO 4 (98%) > [CH 2 COOHPy][HSO 4 ] > [(CH 2 ) 2 COOHPy][HSO 4 ]. The [CH 2 COOHPy][HSO 4 ] showed better activity during the removal of dibenzothiophene (DBT) in n -octane by a combination of extraction and oxidation, and the sulfur removal reached 99.9% under the conditions of V model oil = 20 mL, V IL = 1.2 mL, T = 30 °C and H 2 O 2 /S molar ratio (O/S) = 6. In the same conditions, the removal of benzothiophene (BT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT) by using [CH 2 COOHPy][HSO 4 ] reached 82.5% and 89.1%, respectively. Ionic liquid [CH 2 COOHPy][HSO 4 ] can be recycled 9 times without a significant decrease in the sulfur removal.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Yichang Ma,Jianxian Zeng,Yajie Zeng,Hu Zhou,Guoqing Liu,Yuan Liu,Lingwei Zeng,Jian Jian,Zhengqiu Yuan
In order to separate palladium (II) from electroplating wastewaters, poly(4-vinylpyridine)-b-polysulfone-b-poly(4-vinylpyridine) (P4VP-PSF-P4VP) / polysulfone blend membranes were fabricated by combining non-solvent induced phase separation, surface segregation and self-assembly of block copolymer . Amphiphilic P4VP-PSF-P4VP was used as the membrane base material, which was synthesized by introducing the functional monomer of 4-vinylpyridine (4-VP), and polysulfone as the additive. Effects of blend ratio and 4-VP content on membrane performance, such as structure, hydrophilicity, pure water flux and adsorption capacity towards Pd (II), were investigated. The membranes exhibited dense surface structure and low roughness due to surface segregation and self-assembly of P4VP-PSF-P4VP. The presence of 4-VP increased hydrophilicity and water flux of membrane, and it also provided good adsorption capacity towards Pd (II) (up to 103.1 ± 5.15 mg/g). Further, the membrane was used to separate Pd (II) from simulated wastewaters during filtration. It showed good rejection ability and high selectivity towards Pd (II) in co-existence of Cu (II) and Ni (II), and selectivity coefficients of Pd/Cu and Pd/Ni are 41.9 ± 1.88 and 97.8 ± 4.32, respectively. In filtration process of actual electroplating wastewater, the membrane also exhibited excellent rejection performance (Pd (II) rejection reached up to 96.8 ± 2.71%). Perhaps it is suitable for future practice applications.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTAL GROWTH & DESIGN
·
2012
·
IF 4.72
Qian Tao,Jia-Mei Chen,Lei Ma,Tong-Bu Lu
One phenazopyridine monohydrate (1·H2O), one cocrystal of phenazopyridine with phthalimide (2), and three salts of phenazopyridine with benzoic acid (3), 4-hydroxyphenylacetic acid (4), and scaaharin (5) were synthesized, and their structures were determined by single crystal X-ray diffraction. The results of dissolution experiments indicate that the solubility of phenazopyridine can be enhanced after the formations of cocrystal and salts, in which the apparent solubility value of 5is approximately 9 times as large as that of phenazopyridine in water, and the apparent solubility value of 4 is approximately 10 times as large as that of phenazopyridine hydrochloride (1·HCl) in 0.1 M HCl aqueous solution. The results of the stability study demonstrate that 2–5 are less hygroscopic than 1·H2O and 1·HCl at both 85% and 98% RH.
研究领域:
药学
·
化学
✓ 已验证
DOI
高影响因子
Separations
·
2021
·Vol. 8
·期 11
·216
·
IF 2.777
Zhaojin Zhang,Yinan Li,Jing Gao,Alula Yohannes,Hang Song,Shun Yao
Based on above background, quinolinium, 8-hydroxy-quinolinium, and benzothiazolium ionic liquids, containing the acidic anions of methanesulfonate ([CH3SO3]−), phosphate ([H2PO4]−),p-toluenesulfonate ([p-TSA]−), and bisulfate ([HSO4]−) were synthesized. After comparison, the aqueous solution of benzothiazole bisulfate [HBth][HSO4] was selected as the most ideal extractant for removing pyridine and aniline. Meanwhile, benzothiazole bisulfate [HBth][HSO4] solution was found as the best one for removing quinoline from simulated oil. Then, the single stage extraction and two-step extraction were used in the extraction for the simulated oil containing pyridine, quinoline or aniline, and their mixture, respectively. Their denitrogenation performance on their N-removal effect was compared on the basis of structural features, and main extraction conditions were further investigated, including mass ratio of IL to water, mass ratio of IL to oil, and temperature. Furthermore, the extraction process was described by two kinetic equations. Recovery and reuse of IL were realized by back-extraction and liquid-liquid separation, and a related mechanism was speculated, according to all the experimental results. Finally, based on the developed method for preparing complex adsorbent tablets, corresponding immobilized IL was used to remove target objects, by solid phase extraction, in order to extend separation ways, which was more easily recovered after extraction.Keywords:ionic liquids;denitrogenation;extraction;pyridine;quinoline;aniline;simulated oil
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Pengfei Li,Ruiming Yin,Yunfei Bai,Yanhong Ding,Xiaofeng Zeng,Yongquan Li
To reduce the lattice oxygen content of Si 3 N 4 green bodies, samples were prepared using an N,N-dimethylacrylamide (DMAA) system. The endothermic and exothermic peaks are related to the decomposition of organic matter and the reaction between pyrolytic carbon and impurity oxides in the sintering process. Multi-step heat preservation during the thermal degreasing process reduced the carbon content and defects. The α→β phase transformation and aspect ratio of grains changed from 89.2% to 4.84:1 at 1640 °C to 96.3% and 7.80:1 at 1700 °C, respectively. The relative density, hardness, fracture toughness, and thermal conductivity of the Si 3 N 4 samples reached 98.5%, 1353 HV, 8.51 MPa·m 1/2 , and 97.1 W·m −1 ·K −1 , respectively. Pyrolytic carbon can react with SiO 2 , which reduces the content of the glass phase in the green body and affects the dissolution and precipitation process and lattice oxygen content. In the structure of the Si 3 N 4 sample, carbon particles with sizes of 100–500 nm and near-spherical shapes were observed. Intergranular-phase YMgSi 2 O 5 N was formed during the sintering process, which was conducive to improving the thermal conductivity. This article uses lower temperature and no pressure conditions to prepare Si 3 N 4 ceramics, which can provide reference for batch and low-cost production.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2020
·Vol. 26
·期 1
·109
·
IF 3.267
Hong-Juan Liu,Rui Yi,Dong-Mei Chen,Chao Huang,Bi-Xue Zhu
Four complexes, [Cu4L2(OCH3)2(CH3OH)2]·2H2O (1), [Zn2L2Cl4]·2H2O·2CH3OH (2), [Hg2L2Br4]·4CH3OH (3), and {[CdL2Cl2]·4H2O·4CH3OH}n(4), have been synthesized and characterized from a bis(pyridylhydrazone) ligand (L) with copper(II), zinc(II), mercury(II) or cadmium(II), respectively. Complex1exists as a centrosymmetric tetranuclear dimer withLas deprotonated tridentate ligand. Complexes2and3exist as centrosymmetric metallamacrocycles withLas bidentate ligand. Complex4exists as a 1D looped-chain coordination polymer. The thermal stabilities and vapor adsorption properties of the four complexes were investigated as well.Keywords:pyridylhydrazone;complex;crystal structure;vapor adsorption
研究领域:
化学
·
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）