OPTICAL MATERIALS
·
2022
·
IF 3.754
Wentong Gao,Wenlu Wu,Shihai Cao,Bing Han,Nengquan Li
Solution-processable host materials play an important role in achieving highly efficient and cost-effective phosphorescent organic light-emitting diodes (PhOLEDs). This paper designed and prepared a simple solution-processable host material of TPA-PyF 2 based on triphenylamine and pyridine to fabricate efficient solution-processed PhOLEDs. TPA-PyF 2 featured an σ-linkage between the electron donor and acceptor units, which not only served to limit the conjugation length of the molecule and maintain a high triplet energy level, but also endowed the host molecule with a three-dimensional structure to enable high film morphological stability for solution processing. As a result, TPA-PyF 2 exhibited a high triplet energy level (2.82 eV), high thermal stability, bipolar charge transfer, and excellent film morphology. Blue solution-processed OLED with a simple double-layer structure based on TPA-PyF 2 host achieved a maximum current efficiency, power efficiency, and luminance of 17.2 cd/A, 7.1 lm/W, and 11519 cd/m 2 , respectively, with a small efficiency roll-off of only 9.1% at the practical luminance of 1000 cd/m 2 . This work reveals that the σ-linkage strategy is promising in designing efficient solution-processable host materials for high-efficiency PhOLEDs.
研究领域:
材料科学
·
有机电子学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2023
·
IF 4.6
Jianhong Zheng,Xi Chen,Xiaoxiao Yin,Kai Chen,Aili Liu,Xiaochun Yu,Shun Wang,Zhongwei Chen
A highly efficient and organic solvent-free synthetic strategy for the selective oxidation of anilines to azoxybenzenes was developed by employing porous Zr-MOFs as catalysts in aqueous hydrogen peroxide solution. The impact of cluster nodes, pore size, and linker functionalities on the catalytic performance of Zr-MOFs was fully evaluated and discussed. Featuring abundant bridging Zr-OH-Zr catalytic sites and confined microenvironments, the pristine UiO-66(Zr) could create abundant reactive oxygen species (ROS) with high H 2 O 2 efficiency, affording quantitative yield of azoxybenzene under mild conditions. Furthermore, the UiO-66(Zr)/H 2 O 2 heterogeneous catalytic system exhibited broad and size-selective substrate scope and excellent stability in consecutive catalytic cycles. Mechanism studies demonstrated that the azoxybenzenes were produced through radical pathway on bridging Zr-OH-Zr sites. This study provided alternative strategies exploiting green catalytic systems with porous MOFs, which might further expand the potential application of the MOFs family.
研究领域:
化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
FIBERS AND POLYMERS
·
2020
·Vol. 21
·期 9
·1927-1937
·
IF 1.797
Nong Yelin,Zhou Zhou,Yuan Jiugang,Wang Ping,Yu Yuanyuan,Wang Qiang,Fan Xuerong
Generally, dyeing and finishing of Bombyx mori silk fibers were proceeded at high temperature, which has the disadvantages of overmuch energy-consumptions. In the present work, bio-inspired in situ coloring and functionalization of silk fabric were carried out via laccase-catalyzed graft polymerization of arylamines, including aniline (ANI) and p -phenylenediamine (PPD). p -Hydroxyphenylacetamide (PHAD) as the model compound of tyrosine residues in silk fibroin (SF) was used to explore the mechanism of graft polymerization by means of MALDI-TOF MS. The actions of the dopants of sodium dodecyl benzene sulfonate (SDBS) and sodium p -aminobenzenesulfonate (ABSA) on the enzymatic treatment were also concerned. The results indicated that laccase might initiate the self-polymerizations of ANI and PPD, respectively, and formed the copolymers of arylamine and PHAD subsequently. High color depth and color fastness were obtained after incubation silk fabric with laccase and arylamines, companying with a noticeable pH-responsiveness. The laccase-mediated treatment endowed silk fabric with antibacterial and antioxidant abilities, meanwhile, the addition of dopants of SDBS and ABSA promoted the enzymatic finishing. Enzymatic graft polymerization of arylamine onto silk fibroin provides a novel approach for dyeing and functionalization of silk fabrics under mild treating conditions.
研究领域:
生物化学
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纺织科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Jianjun Du,Hong Du,Xiangyu Li,Jiangli Fan,Xiaojun Peng
Aniline, a typical example of arylamines, is one of most important raw materials in many industries. However, arylamine-related pollution in waters threatens the public health and environment along with their wide applications. In this work, a simple, fast, and convenient colorimetric sensing system was presented for the arylamine (e.g. aniline) recognition in aqueous media. The system was presented using diazonium salt (DS) decorated gold nanoparticles (AuNPs), based on the classic coupling reaction of arylamine with diazonium salt. DS-AuNPs showed an excellent response and a good sensitivity to aniline, and the limit of detection reached 0.5 μM for aniline in this work. There was a good linear relationship (R2 = 0.997) between the values of A640 nm/520 nm and aniline concentrations over a range of 5–60 μM, which covered the Chinese standard of the maximum permissible pollutant emission concentration for aniline. The introduction of arylamine (e.g. aniline) caused a rapid and obvious red-to-blue color change, so the arylamine-polluted water could be qualitatively recognized by our naked-eyes and quantitatively measured by absorbance changes.
研究领域:
环境科学
·
分析化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Shihao Fan,Yi Liu,Wanglong Jia,Liuchun Zheng
Meta-aramid (PMIA) is a high-performance polymer known for its exceptional properties, however, its molecular chain arrangement and strong hydrogen bonding contribute to its rigidity and brittleness. Additionally, the lack of reactive groups in its molecular structure severely affects the dyeing properties of PMIA, and restrains its applications in various fields. To address these issues, this study introduced 4,4′-thiodianiline (4,4′-TDA) into the main chain of PMIA molecules through copolymerization modification. This approach enhanced the relative molecular weight of the copolymers, resulting in co-PMIAs with improved flexibility. The synthesized copolymers demonstrated excellent mechanical properties and thermal stability, maintaining high strength while improving toughness. Furthermore, the incorporation of this thioether-containing monomer also enhanced the dyeing properties and flame retardancy of PMIA. The modification strategy employed in this research offers valuable insights into the structural modification of aromatic polyamides, and the synthesized novel copolymers show promising applications in the field of protective clothing.
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
SYNTHETIC METALS
·
2021
·
IF 3.266
Yanyu Gao,Wei Zhang,Dongxu Li,Xiaoxue Lin,Xin Qiao,Haijun Niu,Wen Wang
Electrochromic (EC) materials have captured intense attentions in the field of smart window, label screen and camouflage recently. The structure of EC active group is crucial to the properties of product. In this study, novel PAs with EC and memory properties were developed by polycondensation of asymmetry triarylamine N, N ' -bis(4-aminophenyl)-N-isopropyl-N ' -phenylbenzene-1,4-diamine (IPATAA) with five different dicarboxylic monomers. An isopropyl group of the IPATAA molecule is linked to a nitrogen atom to increase electron density and solubility. Furthermore, PAs are apt to be processed into a film by spin-coating or printing. After electro-oxidation, PAs films change from colorless to blue. The coloring time and bleaching time is 2.8–4.1 s and 2.6–4.5 s, respectively. The highest coloring efficiency of PAs film is 366 cm 2 C −1 . Memory devices made using the PAs show non-volatile memory characteristics such as lower switching threshold voltages (<1.08 V) and better switching current ratios (>2 × 10 4 ).
研究领域:
材料科学
·
电子器件
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Microbiology
·
2021
·
IF 5.64
Liu Xinning,Liu Yuanchang,Zhao Guangjian,Zhang Yidan,Liu Lu,Wang Juan,Wang Yifan,Zhang Siyu,Li Xin,Guo Dongliang,Wang Peng,Xu Ximing
Vibrio vulnificus is a zoonotic bacterium that is capable of causing highly lethal diseases in humans; this pathogen is responsible for 95% of all seafood-related deaths in the United States. Arylamine N-acetyltransferases (NAT, E.C. 2.3.1.5) is a major family of xenobiotic-metabolizing enzymes that can biotransform aromatic amine chemicals. In this research, to evaluate the effect of NAT on acetyl group transformation in arylamine antibiotics, we first used sequence alignment to study the structure of V. vulnificus NAT [(VIBVN)NAT]. The nat gene encodes a protein of 260 amino acids, which has an approximate molecular mass of 30 kDa. Then we purified recombinant (VIBVN)NAT and determined the enzyme activity by PNPA and DTNB methods. The DTNB method indicates that this prokaryotic NAT has a particular substrate specificity towards aromatic substrates. However, (VIBVN)NAT lost most of its activity after treatment with high concentrations of urea and H2O2. In addition, we also explored the stability of the enzyme at different temperatures and pH values. In analyzing the influence of metal ions, the enzyme activity was significantly inhibited by Zn2+ and Cu2+. The kinetic parameters Km and Vmax were determined using hydralazine, isoniazid, 4-amino salicylic acid, and 4-chloro-3-methylaniline as substrates, and the Tm, Tagg and size distribution of (VIBVN)NAT were observed. In particular, a molecular docking study on the structure of (VIBVN)NAT was conducted to understand its biochemical traits. These results showed that (VIBVN)NAT could acetylate various aromatic amine substrates and contribute to arylamine antibiotic resistance in V. vulnificus.
研究领域:
微生物学
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生物化学
·
分子生物学
·
药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2019
·
IF 4.914
Hao Wang,Xiaohao Liu,Guangyue Xu,Ziwei Guo,Ying Zhang
ABSTRACT Owing to Fe being the most abundant and least expensive transition metal on the earth, the utilization of Fe-based catalysts for catalytic hydrogenation has attracted worldwide attention. In this work, a series of N-doped C supported Fe catalysts (Fe-N-C) were prepared by co-pyrolysis of cellulose and ferric chloride under ammonia atmosphere. Characterization methods such as elemental analysis, atomic absorption spectroscopy, nitrogen adsorption-desorption isotherms, transmission electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy were carried out to explore the physicochemical properties of the catalysts. Using hydrogenation of nitrobenzene as a model reaction, the catalysts prepared at different pyrolysis temperatures displayed different activities. Fe-N-C-700 exhibited the best activity among these catalysts, with the yield of aniline being up to 98.0% under 5 MPa H 2 at 120 °C after 12 h. Combined with the results of catalyst characterization and comparative tests, the transformation of Fe species and the generation of N-doped C, especially graphitized N-doped C, in the catalyst may be the main factors affecting the activity. A kinetic study was carried out and the apparent activation energy was obtained as 31.53 kJ/mol. The stability of the catalyst was also tested and no significant decrease in the activity was observed after 5 runs.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 24
·48808
·
IF 2.188
Shuwei Cai,Haijun Niu
In this study, four novel triarylamine-based polyimides with different substituted groups (tert-butyl and -H) containing pyrrole moieties were successfully prepared by polycondensation reaction. The electrochemical and electrochromic properties of the polyimides were measured by cyclic voltammetry and spectro-electrochemistry. The polyimides exhibited obvious electrochromic behavior with good thermal stability (the 10% weight-loss temperatures were recorded in the range of 345-386°C), film-forming ability and reversible stability after 1000 s. The color of the polyimide films changed from colorless to light blue or yellow to blue on increasing the applied potential. The highest coloration efficiency reached up to 190 cm 2 C −1 . The polyimide films exhibited a stable response to the light (on or off) after 200 s. Especially, PyHBTPI displayed effective solubility, superior optical contrast (~30%) in the visible region, faster response time (1.19 s for coloring process), and obvious color change from yellow to blue with good stability, thus, confirming the potential use for high contrast displays. Overall, the study demonstrates the successful development of high-performance polyimides for electrochromic and optoelectronic behaviors. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48808.
研究领域:
材料科学
·
电化学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Shuwei Cai,Shuzhong Wang,Dongxu Wei,Haijun Niu,Wen Wang,Xuduo Bai
Four kinds of novel polyamides (PAs) containing pyrrole core with different triarylamine (TAA) groups were designed and synthesized. These PAs exhibit good solubility in various organic solvents and excellent thermal stability. The two PAs prepared from cyclohexane-1,4-dicarboxylic acid exhibit fluorescence maximum at 475–476 nm with quantum yields up to 39.0% and 57.3% in N , N -dimethylacetamide (DMAc) solution. Furthermore, the polymer films show reversible electrochemical redoxidation with color changing from yellowish to khaki to dark blue. Especially, the films have high coloration efficiency (up to 143 cm 2 C −1 at 750 nm) and after over 1000 s the films still exhibit continuous cyclic stability of electrochromism . What's more, these PAs could be used as the photoelectric conversion material owing to their excellent optoelectronic properties.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 43
·22669-22677
·
IF 3.708
Zhongkui Zhao,Hongling Yang,Yu Li
This work presents a facile approach for clean and chemoselective synthesis of various functionalized arylamines from their corresponding substituted nitroarenes through the unexpected synergistic effect of a Lewis acid and the Ni–W2C/AC catalyst, affording almost 100% arylamine yield. The results challenge the long-held axiom that the combination of Lewis acid and hydrogenation catalyst mainly enhances the transformation of nitrobenzene (NB) to p-aminophenol via Bamberger rearrangement of the formed intermediate phenylhydroxylamine (PHA) under catalytic hydrogenation conditions. X-ray diffraction (XRD) and FT-IR spectroscopy were employed to reveal the relationship between catalyst nature and catalytic performance, and a plausible reaction mechanism is also proposed. Reaction results demonstrate that the FeCl3–Ni–W2C/AC catalytic system shows comparable catalytic performance towards precious metals for chemoselective reduction of various aromatic nitro compounds, affording 100% yield for all substrates involved in this work (99.5% of isolated yield for model substrate). Moreover, it can be found that the catalyst could be easily recovered by filtration and recycled without visible loss of its catalytic activity. Therefore, the developed FeCl3–Ni–W2C/AC catalytic system in this work can be considered as a practical candidate for clean and highly-efficient synthesis of diverse functionalized arylamines. We believe this approach can be extended to the other hydrogenation reactions.
研究领域:
化学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2017
·
IF 3.33
Tingting Hou,Chaofeng Zhang,Yehong Wang,Zhenting Liu,Zhixin Zhang,Feng Wang
A metal-free and efficient approach to N -arylpyrrolidines from arylamines and cyclic ethers catalyzed by hydrogen iodine is described. In this protocol, no additive is added and a wide range of N -arylpyrrolidines are synthesized with up to 99% yield. Reaction mechanism involving iodine radical is proposed.
研究领域:
有机化学
·
催化
✓ 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）