FUEL
·
2018
·
IF 4.908
Jun Xu,Limei Chen,Tong Geng,Mannian Ren,Shizhong Wang,Zhijun Song,Fahai Cao
Nickels in crude oil often deactivate the hydrocracking and catalytic cracking catalysts. Strong acids are widely applied to remove these nickels, although they cause severe corrosion to the subsequent catalytic cracking and processing equipment. Polymer brushes bearing specific groups which can adsorb nickel ions are considered as desirable non-corrosive nickel removal agents. In this work, micro-sized spherical polymer brushes bearing imidazole groups (PVIm@SiO 2 ) are first applied to remove trace nickels in crude oil with the help of electric demulsification . The effects of polymer brushes concentration, oil/water ratio and electric demulsification temperature on nickel removal efficiency are investigated. Compared with the monomer (VIm) and polymer (PVIm) bearing imidazole groups, polymer brushes exhibit a much higher nickel removal efficiency than the other two, which is approximately 66.7%. In addition, the regeneration of polymer brushes are achieved by a rapid and simple process using diluted HCl. As well as, the removal efficiency of Ni remains 62.5% in 5 consecutive cycles. Consequently, these spherical polymer brushes bearing imidazole groups are reasonable nickel remover for crude oil.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Pengfei Bian,Huiqing Yang,Lexin Zhang,Zhiwei Liu,Guiying Qiao,Yong Han,Tifeng Jiao
Novel organic small molecule structures have received increasing attention in the preparation of multifunctional thin film materials and have become the subject of research in many cutting-edge directions. In this work, imidazolyl and transbutylene glycolic acid molecules and dye molecules were designed and prepared as composite films by supramolecular self-assembly in the LB technique, and their morphological features and spectral properties were analyzed. The results showed that the prepared LB films presented different aggregation states. In addition, their photoelectrochemical properties, on ITO sheets were tested, all of which showed good optoelectronic properties, and their binding energies, structure optimization, and electrostatic potentials were theoretically calculated by DFT simulations, which proved that the prepared films have good optoelectronic properties, and have the potential to become optoelectronic multifunctional ultrathin film devices.
研究领域:
材料科学
·
有机化学
·
光电子学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 135
·期 12
·46034
·
IF 1.86
Jiqin Chen,Chunhui Shen,Shanjun Gao,Yuan Yuan,Xuechao Ren
Novel organic–inorganic hybrid membranes, based on poly(2,6-dimethyl-1,4-phenylene oxide), have been prepared through 1,2-dimethylimidazole functional groups and double crosslinking agents including 3-glycidyloxypropyltrimethoxysilane and tetraethyl orthosilicate by sol–gel process for the purpose of improving the conductivity and alkaline resistance. The structure of membranes was characterized using Fourier-transform infrared spectra, 1 H NMR, and X-ray diffraction. The physico-chemical properties of all membranes were shown in ion exchange capacity, water uptake, stability, and conductivity. Membranes with OH – conductivity up to 0.022 at 25 °C and 0.036 S cm −1 at 80 °C. Promisingly, the chemical stability of the resulting membranes remains unchanged after storage in 2 mol dm −3 KOH at 25 °C over at least 10 days. The tensile strength can be higher than 30 MPa, and the elongation at break (Eb) is in the range 6.68–10.84%. Hence, this hybrid membrane can be potentially applied in alkaline fuel cells. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46034.
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
Smart Materials and Structures
·
2023
·Vol. 32
·期 11
·115026
·
IF 4.1
Shaojun Chen,Zhenghe Ren,Ming Chen,Heng Chen,Haitao Zhuo,Haiqiang Zhong
Most self-healing materials have complex chemical structures and require cumbersome preparation processes, which seriously limit their large-scale application in the fields of electronic skins, wearable devices, biomedical applications and soft robotics. In this study, self-healing elastomers based on π–π stacking between imidazole groups were prepared by simpler and faster photo-polymerization with butyl acrylate (BA) and 1-vinyl imidazole (VIM), coded as BVn. Due to the imidazole groups in the side chains, the prepared elastomers had excellent self-repairing properties. After healing at 60 °C for 24 h, the strength and elongation at break of the repaired sample recovered to 97.2% and 95.4% of the original values, respectively. Importantly, the BVn based elastomers relied on π–π stacking interactions between imidazole groups rather than covalent crosslinks and could be recycled. These new self-repairing composite elastomers with high thermal stabilities, high elongations at break, good recoverabilites and high self-repairing efficiencies have great application potentials.
研究领域:
材料科学
·
高分子化学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
·
2016
·
IF 3.958
Da Yang,Huan Liu,Dong-Liang Wang,Yong Lu,Xiao-Li Zhao,Ye Liu
The complex of Au-L1 containing imidazolyl ring and the phosphine-ligated-Au moiety was synthesized and applied as the efficient bi-functional catalyst for the one-pot sequential condensation/annulation reaction for the synthesis of pyridine derivatives. It was found that, as for Au-L1 , the involved imidazolyl group acted as a Lewis base to catalyze the condensation of carbonyl compounds with propargylamine to form the imino intermediate, and the involved Au + -complex species with alkynophilicity corresponded to the subsequent activation of imino-tailed alkynyl to afford dehydropyridine intermediate. The latter proceeded auto-oxidation reaction to afford the pyridine derivatives. The observed sequential catalysis over Au-L1 proved more efficient than that over the mechanical mixtures of the Au-complex ( Au-L2 ) and N -methylimidazole, because the free N -methylimidazole as an N-containing donor competed with the alkyne substrate to coordinate to Au-center. Moreover, Au-L1 exhibited good generality to a wide range of the substrates for the synthesis of 2,3-fused pyridine derivatives and 2-aryl(heteroaryl)-substituted pyridines.
研究领域:
有机化学
·
催化化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Dandan Li,Zhao Ke,Ke Xu,Fengna Dai,Mengxia Wang,Chunhai Chen,Guangtao Qian,Youhai Yu
The poor mechanical properties of polyimide (PI) aerogels made from biphenyl-3,3′,4,4′-tetracarboxylic dianydride (BPDA) and 4,4′-oxidianiline (ODA) limit their application. In this paper, an aromatic heterocyclic diamine, 5-amino-2-(4-aminophenyl)benzimidazole (PABZ) was introduced into the BPDA/ODA backbone to improve the comprehensive performance. The obtained PI aerogels represented excellent mechanical properties. The compressive Young’s modulus was up to 53.9 MPa and the stress at 10 % strain was as high as 2.39 MPa. Meanwhile, the tensile Young’s modulus ranged from 234 to 464 MPa and the tensile strength was up to 2.40 MPa. At the same time, all formulations of PI aerogels possessed outstanding thermal insulation, superb flame resistant and self-extinguishing performances, promising to be good candidates for special protective materials. Furthermore, the correlation between changes in morphology and structure resulting from the introduction of PABZ and PI aerogel properties was systematically analyzed.
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 Healthcare Materials
·
2024
·
IF 10
Yuwei Zheng,Jiaying Chi,Jiayu Ou,Ling Jiang,Liqing Wang,Rui Luo,Yilang Yan,Zejun Xu,Tingting Peng,Jianfeng Cai,Chuanbin Wu,Peng Teng,Guilan Quan,Chao Lu
The development of narrow-spectrum antimicrobial agents is paramount for swiftly eradicating pathogenic bacteria, mitigating the onset of drug resistance, and preserving the homeostasis of bacterial microbiota in tissues. Owing to the limited affinity between the hydrophobic lipid bilayer interior of bacterial cells and most hydrophilic, polar peptides, the construction of a distinctive class of four-armed host-defense peptides/peptidomimetics (HDPs) is proposed with enhanced specificity and membrane perturbation capability against Pseudomonas aeruginosa by incorporating imidazole groups. These groups demonstrate substantial affinity for unsaturated phospholipids, which are predominantly expressed in the cell membrane of P. aeruginosa , thereby enabling HDPs to exhibit narrow-spectrum activity against this bacterium. Computational simulations and experimental investigations have corroborated that the imidazole-rich, four-armed peptidomimetics exhibit notable selectivity toward bacteria over mammalian cells. Among them, 4H10, characterized by its abundant and densely distributed imidazole groups, exhibits impressive activity against various clinically isolated P. aeruginosa strains. Moreover, 4H10 has demonstrated potential as an antibiotic adjuvant, enhancing doxycycline accumulation and exerting effects on intracellular targets by efficiently disrupting bacterial cell membranes. Consequently, the hydrogel composed of 4H10 and doxycycline emerged as a promising topical agent, significantly diminishing the skin P. aeruginosa burden by 97.1% within 2 days while inducing minimal local and systemic toxicity.
研究领域:
微生物学
·
药理学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 27
·期 6
·5715-5722
·
IF 1.798
Tao Chaoyou,Yuan Xiaodong,Yin Qiang,Yan Hongwei,Ni Wei,Yan Lianghong,Zhang Lin
Europium(III) complexes have attracted tremendous interests from scientists for their excellent properties and their important potential applications in the fields of organic light emitting diodes, biological labeling, laser media. In this paper, two novel europium(III) complexes having 2-thenoyltrifluoroacetylacetone (tta) as the first ligand and the second ligands bearing benzimidazole groups were synthesized and characterized by FT-IR, UV–Vis, 1 H-NMR, and elemental analysis. The photoluminescent properties of complexes in the solid state, in ethanol solution and embedded in poly(methyl methacrylate) (PMMA) were investigated. All europium(III) complexes exhibited strong luminescent intensity, high quantum yields (Φ) and long luminescent lifetimes. The intrinsic luminescent quantum yields (Φ LN ) and the stimulated emission cross-section (σ p ) of complexes were obtained based on the emission spectra and luminescent lifetimes of 5 D 0 excited state for europium(III) ion. All europium(III) complexes exhibited relatively high intrinsic luminescent quantum yields. In view of σ p values, which are the same order as the values of Nd-glass laser for practical use, these europium(III) complexes may find potential applications in the field of high-power laser media.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2016
·
IF 5.557
Shaofei Wang,Ye Liu,Mingwei Zhang,Dongdong Shi,Yifan Li,Dongdong Peng,Guangwei He,Hong Wu,Jianfeng Chen,Zhongyi Jiang
Two kinds of membranes using imidazole groups and Zn ions respectively as CO 2 carriers are designed to investigate different facilitated transport behaviors and the concomitant separation properties. Poly(N-vinylimidazole)@CNT (PVI@CNT) and Zn-poly(N-vinylimidazole)@CNT (Zn-PVI@CNT) nanoparticles are synthesized via precipitation polymerization then incorporated into polyimide to prepare hybrid membranes. PVI@CNT filled membrane shows CO 2 facilitated transport behavior and distinctly enhanced CO 2 separation property with a maximum CO 2 permeability increment of 90% at humidified state, which is attributed to the nucleophilic addition reaction between imidazole group and CO 2 . Zn-PVI@CNT filled membrane shows CO 2 facilitated transport behavior and distinctly enhanced CO 2 separation property with a maximum CO 2 permeability increment of 93% at dry state, which is attributed to the π complexation reaction between Zn ion and CO 2 . The different facilitated transport behaviors of these two membranes are further analyzed for the rational design and intensified separation properties of membrane materials.
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
HIGH PERFORMANCE POLYMERS
·
2015
·
IF 1.286
Yewei Xu,Yi Sun,Yonglin Lei,Jichuan Huo,Lin Zhang
This article presents a convenient polymerization route to synthesize poly(arylene ether)s containing N-arylenebenzimidazolyl groups. The novel polymers were prepared by a catalyst-free nucleophilic substitution reaction, in which the N–H and O–H sites were removed from 2-(2-hydroxyphenyl)-1H-benzimidazole with different activated difluorides containing carbonyl groups in sulfolane. The reaction was carried out in the presence of anhydrous potassium carbonate at 210°C. The structures of the polymers were characterized using Fourier transform infrared spectroscopy, proton nuclear magnetic resonance spectroscopy, and elemental analysis. The results show good agreement with the proposed structure. All resulting polymers show essentially amorphous patterns. Moreover, differential scanning calorimetry and thermogravimetric measurements show that the polymers have high glass transition temperatures (>209°C), good thermostability, and high decomposition temperatures (>425°C). Furthermore, the polymers also exhibit excellent solubility in common organic solvents.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 24
·4693
·
IF 5
Huanyou Su,Hua Lin,Pengfei Li,Bowen Li,Xiaodong Xu,Jiacheng Li,Yuanquan Wu,Jiaqi Hui,Dan Liu
The wide range of applications and continuous demand for plastics is causing serious global environmental problems. Massive discharges of expanded polystyrene (EPS) are thought to be primarily responsible for the increased white pollution. Waste EPS has received wide attention in the development of innovative products. White light-emitting diodes pumped by a near-UV chip (n-UV WLEDs) are regarded as a very promising solid-state lighting. The performance of the n-UV WLED is largely determined by the properties of the tricolor luminescence materials. In this work, a blue-emitting polymer film for n-UV WLED applications was developed from waste EPS. First, using waste EPS as a raw material, benzimidazole groups were bonded to PS benzene rings by chemical reactions to obtain modified PS (PS-PBI). Then, a film based on PS-PBI was prepared by a simple solution drop-casting method. The PS-PBI film can emit intense blue light when irradiated with 365 nm light. An n-UV WLED pumped by a 365 nm UV chip was fabricated using PS-PBI film as the blue-emitting layer. The fabricated n-UV WLED shows excellent luminescence properties, such as a bright white light with color coordinates of (0.337, 0.331), a relatively low color temperature (CCT, 5270 K), and an especially high color rendering index (CRI, 93.6). The results prove that the blue-emitting PS-PBI film prepared from waste EPS is a very promising candidate for n-UV WLED applications. The strategy of converting waste EPS into a high-value-added blue-emitting film in this work provides a convenient and feasible approach for upcycling waste EPS, achieving significant environmental and economic benefits.Keywords:waste expanded polystyrene;blue-emitting polymer film;light-emitting diode;benzimidazole group;chemical modification
研究领域:
材料科学
·
环境科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2018
·Vol. 29
·期 10
·105501
·
IF 3.404
Chengrong Niu,Jie Hu,Yinfeng Li,Jinghang Leng,Songjun Li
In the present work, a thermoresponsive nanorattle with a Ag nanoparticle (NP) core (one catalyst in the nanorattle), and a poly(N-isopropylacrylamide) shell was developed. An imidazole group was grafted on the polymer shell by copolymerization as the other catalyst. Owing to the catalytic activities of the imidazole group and Ag NP with regards to hydrolysis and reduction, respectively, this nanorattle exhibited tandem-reaction catalytic abilities. In addition, because of the shrinkage of the poly(N-isopropylacrylamide) shell at high temperatures, the tandem reaction could be controlled to stop at the first reaction step. That is to say, only the hydrolysis reaction was catalyzed by the imidazole group being grafted on the surface of the shell. The reduction step in the tandem reaction catalyzed by the Ag particle, however, was switched off by the shrinkage of the poly(N-isopropylacrylamide) shell. This protocol opens up an opportunity to develop controllable catalysts for complicated chemical processes.
研究领域:
材料科学
·
催化
·
纳米技术
·
化学工程
✓ 已验证
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）