INORGANICA CHIMICA ACTA
·
2015
·
IF 2.046
Wei-Guo Jia,Dan-Dan Li,Cuiping Gu,Yuan-Chen Dai,Ying-Hua Zhou,Guozan Yuan,En-Hong Sheng
Binuclear [{(DMOX)CdCl} 2 ( μ -Cl) 2 ] (DMOX = 4,5-dihydro-2-(4,5-dihydro-4,4-dimethyloxazol-2-yl)-4,4-dimethyl-oxazole) ( 1 ) and mononuclear [(Dm-Pybox)CdCl 2 ] (Dm-Pybox = 2,6-bis[4′,4′-dimethyloxazolin-2′-yl]pyridine) ( 2 ) were obtained by reacting CdCl 2 with DMOX and Dm-Pybox ligands, respectively. In the solid state, the supramolecular structures of 1 and 2 feature helical chains fabricated by C–H⋯Cl hydrogen bond interactions. The C–N cross-coupling reactions catalyzed by the two complexes were also investigated in homogeneous system. The results show that binuclear complex 1 exhibit significantly enhanced catalytic activity for C–N cross-coupling reactions.
研究领域:
化学
·
材料科学
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DOI
高影响因子
JOURNAL OF SURFACTANTS AND DETERGENTS
·
2010
·Vol. 14
·期 3
·317-324
·
IF 0.795
Cui Zheng-gang,Song Hong-xing,Yu Jun-jie,Jiang Jian-zhong,Wang Feng
Alkali-surfactant-polymer (ASP) flooding has been considered to be one of the useful tertiary oil recovery techniques. However, field tests in China have revealed that serious side effects may occur due to using alkali. Thus alkali-free SP flooding is more favorable in China. Unfortunately, surfactants effective in ASP flooding are usually ineffective in the absence of alkali and new surfactants need to be designed. In this paper N -(3-Oxapropanoxyl)dodecanamide as a pure compound and a mixture of homologues with narrow EO number distribution, synthesized by the reaction of lauroyl chloride with diglycolamine and addition of one ethylene oxide to coconut monoethanolamide respectively, are examined for their adaptability in SP flooding. It is found that, when mixed with betaines, both products can reduce Daqing crude oil/connate water interfacial tension to a magnitude of 10 −3 –10 −4 mNm −1 at 45 °C in a wide surfactant concentration range, 0.01–0.5 wt%, and oil displacement tests using natural cores indicates that a tertiary oil recovery of 18.6 ± 0.4% OOIP can be achieved by SP flooding with the N -(3-Oxapropanoxyl)dodecanamide as the main surfactant without adding any alkaline agent and neutral electrolyte. N -(3-Oxapropanoxyl)dodecanamide, as a nonionic surfactant without a cloud point and producible industrially from renewable materials, is an ideal surfactant for SP flooding in the absence of an alkaline agent.
研究领域:
石油工程
·
化学工程
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DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Lin Chen,Feng-Shu Yue,Yu-Ming Zhao,Shuang-Shuang Wang,Yu-Chao Li,Guang Li,Xiang-Cai Ge
Surface modification of polyolefine separators for high performance lithium-ion batteries has been a worthwhile research topic. In this work, poly (poly (ethylene glycol) methacrylate) (PPEGMA) was firstly grafted onto polypropylene (PP) separator based on N-hydroxyphthalimide (NHPI) catalysis and activators regenerated by electron transfer atom transfer radical polymerization (ARGET-ATRP). Bis(2,2,2-trichloroethyl) azodicarboxylate (BTCEAD) was anchored on the surface of PP separators in the presence of NHPI. Then BTCEAD functionalized PP separator initiated the polymerization of PEGMA by ARGET-ATRP. Thus, structure controllable PPEGMA was grafted on the surface of PP separators. The results of contact angle and electrolyte uptake tests demonstrated that electrolyte wettability of PPEGMA functionalized PP separator has been significantly improved. Electrochemical measurements indicated that the ionic conductivity and discharge capacity retention of cells assembled with PPEGMA functionalized PP separators were distinctly higher than that of cells with pristine PP separator. Herein, we presented a new methodology with high efficiency to modify PP separators under mild condition, which was also applied to other polyolefine separator for high performance lithium-ion batteries. The proposed approach might have many other potential applications in membrane modification field.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2014
·Vol. 292
·期 10
·2633-2645
·
IF 2.41
Cong Houluo,Zheng Sixun
In this contribution, we reported the synthesis of poly( N -isopropylacrylamide)- block -poly(acrylic acid) (PNIPAAm- b -PAA) copolymer networks via sequential reversible addition-fragmentation chain transfer (RAFT) polymerization. The PNIPAAm- b -PAA block copolymer networks were characterized by means of Fourier transform infrared spectroscopy (FTIR) and small angle X-ray scattering (SAXS). The volume phase transition (VPT) temperatures of the PNIPAAm- b -PAA hydrogels were measured by means of micro-differential scanning calorimetry (micro-DSC). It was found that the block copolymer hydrogels displayed the VPT temperatures lower than the control PNIPAAm hydrogel. Compared to the control PNIPAAm hydrogel, the deswelling and reswelling properties of the block copolymer hydrogels were significantly improved. The improved thermoresponsive properties of the PNIPAAm- b -PAA hydrogels have been interpreted on the basis of the formation of the architecture of the block copolymer networks.
研究领域:
高分子化学
·
生物材料
·
药物递送
·
组织工程
·
智能响应材料
✓ 已验证
DOI
高影响因子
POLYMER
·
2018
·
IF 3.483
Xiongwei Wang,Yunfeng Yang,Yuanyuan Zhou,Peiyi Wu,Hongyu Chen,Peter Trefonas
In this work, we have systematically studied the miscibility and phase structure of a hydrogen-bonded polymer blend composed of short rigid poly( N -acryloyl piperidine) (PAP) and long flexible poly(acrylic acid) (PAA). Ultrathin PAP/PAA blend films with various compositions were prepared by solution-casting method. It was found that the spin-coated blend films had distinct surface features with many protuberant domains that can be extracted by toluene. Composition analysis of the isolated protrusion domains and matrix domains revealed that PAP/PAA blend is a partially miscible system with PAP-rich protrusion phase (dispersed phase) and PAA-rich matrix phase. The hydrogen-bonding interaction between the amide carbonyl of PAP and hydroxyl of PAA (O=C ⋯ H-O) was found to account for the partial miscibility of these two components. Interestingly, only one positively shifted glass transition temperature (T g ) was detected for this blend. This behavior is very different from other reported partially miscible polymer blends, in which two inward shifted T g s are usually observed. Thermal analysis further disclosed that T g s of PAP-rich dispersed phase and PAA-rich matrix phase are very close to each other, thus merged into one broad T g presented in the blend. The close T g s of these two phases is attributed to the strong hydrogen-bonding interaction between PAP and PAA, which surpasses the compositional difference between them. At high PAP concentrations (above 60 mol percent), the separation of excess PAP in dispersed phase contributed to the appearance of a second T g that corresponds to that of PAP. Such phase behavior was further confirmed in the free-standing films of PAP/PAA blends.
研究领域:
高分子化学
·
材料科学
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DOI
高影响因子
SYNTHESIS-STUTTGART
·
2015
·Vol. 47
·期 23
·3751-3757
·
IF 2.689
Zhijie Li,Quan Wen,Lihong Zhou,Xingmei Deng,Qingle Zeng
The synthesis of highly important α-hydroxycarboxylic acid anilides via copper-catalyzed chemoselective C–N coupling reactions of α-hydroxyamides and aryl halides is described. This highly selective N-arylation process demonstrates wide substrate scope, cost savings and easy operation. In addition, the chirality of l-3-phenyllactamide is preserved during the reaction.
研究领域:
有机化学
·
合成化学
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DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2020
·
IF 4.335
Nian Zheng,Ce Liu,Ya-Nan Ding,Wei-Yu Shi,Bo-Sheng Zhang,Yong-Min Liang
Copper-catalyzed three-component redox-neutral ring opening of benzothiazoles with aryl iodides and O-benzoyl hydroxylamines for the synthesis of 1-amino-N-(2-(phenylthio)phenyl)methanimine has been developed. This one-pot reaction undergoes C–S and N–O bond cleavage and new C–S and C–N bond construction. Several control experiments excluded a free radical procedure and also demonstrated the secondary amine as a possible intermediate, which was vital to the catalytic reaction. Meanwhile, the deuteration experiment got rid of the C–H activation dehydroisomerization of the benzothiazole mechanism.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Biobased Materials and Bioenergy
·
2024
·Vol. 18
·期 6
·1095-1104
·
IF 0.5
Chen Xuewen,Chen Xiaogang,Tang Yichen,Lai Yongxian,Yan Jianna,Jiang Long,Luo Hao,Wang Qingliang,Chen Yuchong
Scalp alopecia areata (SAA) is a common non-scarring hair loss condition, associated with factors such as autoimmune responses, genetics, emotional stress, and endocrine imbalances. Current treatments for SAA included minoxidil, topical steroid creams, biologics, and plant extracts.
Tea tree oil (TTO), a natural plant extract, is known for its antibacterial, anti-inflammatory, and acaricidal properties, and it also provides nourishment for hair. In this research, a natural extract of TTO, was prepared to analyze its antibacterial properties. The hair follicle stem cells
(HFSCs) of patients with primary SAA were analyzed to understand the influences of TTO on migration of HFSCs. TTO was extracted from fresh tea tree leaves using steam distillation. Quantitative analysis of gas chromatography-mass spectrometry (GC/MS) qualitative analysis and its total ion
chromatogram using area normalization method were conducted. Meanwhile, its antibacterial activity was tested against five common pathogens (Escherichia coli (E. coli), Staphylococcus aureus (S. aureus), Staphylococcus albus (S. albus), Pseudomonas
aeruginosa (P. aeruginosa), and Candida albicans (C. albicans)) by measuring the diameter of inhibition zones (DIZ), minimal inhibitory concentration (MIC), and minimum bactericidal concentration (MBC). HFSCs were isolated from patients with SAA and cultured in
vitro, with cell identification performed through cytokeratin 15 (K15) immunofluorescent staining. The HFSCs were then exposed to varying concentrations (0.0, 0.5, 2.0, 5.0, 10.0, and 25.0 mmol/L) of TTO for culture, and cell proliferation activity (CPA) was assessed using the 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazoliumbromide
(MTT) assay, while migration of HFSCs was evaluated using the Transwell chamber assay. Results demonstrated that the extracted TTO had a content of 0.69 g and an extraction rate of 2.32%. 36 components were identified, constituting 98.67% of the total, with 4-terpineol reaching a high concentration
of 48.35%. It exhibited a DIZ of less than 25 mm against all tested pathogens, with MIC values lower than 29 mg/mL and MBC values below 38 mg/mL. Patients with SAA displayed yellow and black dots, broken hair, malnourished and exclamation mark hairs, with few flag hairs observed in skin microscope
examination. Isolated and cultured HFSCs expressed K15 primarily in the cytoplasm and exhibited favorable growth dynamics. Treatment with various concentrations of TTO greatly increased CPA and migrated cell numbers in HFSCs, with the optimal effect observed at 5.0 mmol/L concentration of
TTO. In conclusion, the plant extract TTO possessed significant antibacterial activity and can promote proliferation and migration in vitro of HFSCs, suggesting its potential therapeutic application for SAA.
研究领域:
肿瘤学
·
药理学
·
细胞生物学
✓ 已验证
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Wei Wen,Chunying Wang,Xudong Chen,Jingyi Wang,Yaobin Li,Fei Wang,Wenpo Shan,Ping Ning,Kai Li
Two-dimensional materials have garnered significant attention in the field of catalysis due to their high electron transfer efficiency. In this study, a quasi-two-dimensional carbon–nitrogen doped cobalt-based catalyst (Co-N-C (F)) was synthesized for the investigation of formaldehyde (HCHO) oxidation at room temperature. The electronic coordination structure of the catalyst was modified by varying the calcination temperature, resulting in the formation of Co-N 4 sites that enhance the degradation of the intermediate formate. Additionally, the quasi-2D structure formed during high-temperature pyrolysis retains characteristics of the ZIF 3D material, with a high specific surface area and a porous aggregation structure, which further enhances the exposure of active centers and diffusion of the feed gas. Characterization results showed that the number of Co-N 4 sites on the catalysts increases with the rise in pyrolysis temperature, with the Co-N-C (F)-1000 catalyst exhibiting the highest concentration of Co-N 4 sites. Activity test results indicated that the Co-N-C (F)-1000 catalyst achieved a 100 % HCHO removal rate at 25 °C, with WHSV 200,000 mL/(g·h). In contrast, the activity of the Co-N-C (F)-1100 catalyst decreased, which could be attributed to the aggregation of Co particles at excessively high temperatures. The HCHO oxidation mechanism of the Co-N-C (F) catalysts was investigated using in situ diffuse reflectance infrared spectroscopy ( in situ DRIFTS), and the reaction was found to follow the sequence HCHO → HCOO − → CO 2 + H 2 O, with formate degradation as a rate-limiting step.
研究领域:
催化材料
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Wen-Long Yu,Shi-Lei Zhao,Guang-Wen Xu,Xin Li,Xiao-Lei Zhang,Yu-Ling Shan,Jun-Wei Ding,Guo-Hui Qin,Jun-Mei Zhang,Xiang Feng,De Chen
The chloroxylenol (PCMX) has shown well virucidal efficacy against COVID-19, but the large-scale utilization of which will undoubtedly pose extra environmental threaten. In the present study, the recycled industrial phenylenediamine residue was used and an integrated strategy of “carbonization-casting-activation” using super low-dose of activator and templates was established to achieve in-situ N/O co-doping and facile synthesis of a kind of hierarchical hyperporous carbons (HHPC). The sample of HHPC-1.25–0.5 obtained with activator and template to residue of 1.25 and 0.5 respectively shows super-high specific surface area of 3602 m 2 /g and volume of 2.81 cm 3 /g and demonstrates remarkable adsorption capacity of 1475 mg/g for PCMX in batch and of 1148 mg/g in dynamic column adsorption test. In addition, the HHPC-1.25–0.5 exhibits excellent reusability and tolerance for PCMX adsorption under various ionic backgrounds and real water matrix conditions. The combined physio-chemistry characterization, kinetic study and DFT calculation reveal that the enhanced high performances originate from the hierarchical pore structure and strong electrostatic interaction between PCMX and surface rich pyridinic-N and carbonyl groups.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Tianyue Su,Junsheng Wang,Chun Cai
The nickel phosphides have garnered increasing attention as an excellent catalytic site in the fields of electrocatalysis and hydrotreating, but their application in organic synthesis remains infrequent. In this study, ammonium phosphate and nickel chloride were employed as the doping sources for the first time to synthesize the Ni-based ZIF-8 precursor via the host–guest method. Subsequently, the precursor was pyrolyzed to obtain Ni2P nanoparticles (NPs) supported on N, P co-doped carbon. The composite materials exhibit elevated metal loading and effective dispersion due to the synergistic combination of phosphorus and nickel. Specifically, compared with Ni-NC, the optimal Ni2P-NCP-1 exhibits enhanced catalytic activity in the α-alkylation of arylacetonitriles with alcohols using KOH as the base. It shows a wide broad substrate scope at 140 °C for 12 h in n-octane using a hydrogen borrowing strategy. Through characterizations and mechanistic studies, it has been discovered that the introduction of P source not only provides more basic sites on carbon matrix but also leads to the formation of Ni2P NPs, which facilitates the catalytic efficiency by modifying the electronic structure of Ni. Compared with the metallic Ni species, the synergistic effect between Ni2P and acid-basic sites significantly influences the dehydrogenation of alcohols to generate Ni–H species. This study successfully achieves simultaneous phosphating of both the metal and support, and it also demonstrates that the N2P-NCP-1 catalyst has significant potential in the heterogeneous organic transformation field.
研究领域:
有机化学
·
材料科学
·
催化反应
✓ 已验证
DOI
高影响因子
Journal of Biomedical Nanotechnology
·
2023
·Vol. 19
·期 8
·1495-1502
·
IF 2.9
Pan Yiting,Bai Haihong,Zhang Guocheng,Liu Wei,Wu Yanqi,Chen Hui,Tian Ying,Yang Zhenqi,Feng Duan,Liu Jiaqi,Wu Dan
N-Glycosylation is one of the most common and important protein posttranslational modifications. Structural aberrations of the N-glycans branching from glycoproteins are closely related to various disease occurrences and progressions. Therefore, global systematic identification of disease-related
N-glycans not only largely facilitates the understanding of their cellular functions but also promotes the development of new diagnostic and therapeutic biomarkers. However, N-glycans are low in abundance and hydrophilic, thereby hindering high-throughput, and large-scale N-glycan analysis
and N-glycoproteome research. Here, a zwitterion-functionalized polymer brush-grafted silica hybrid hydrophilic material (poly-SBMA-S) was fabricated by in situ growth of polymeric [2-(methacryloyloxy)ethyl]dimethyl(3-sulfopropyl)ammonium hydroxide (SBMA) chains on porous silica particles
through a surface-initiated atom transfer radical polymerization technique, and it was used as a new stationary phase for highly selective N-glycan enrichment. Human plasma demonstrated 64 N-glycans due to the densely packed polyzwitterion chains and the significantly increased coverage of
hydrophilic binding sites, demonstrating the high potential of the new hydrophilic matrix in the profiling and analysis of N-glycans and other hydrophilic targets.
研究领域:
生物化学
·
蛋白质组学
·
医学诊断
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）