APPLIED CATALYSIS A-GENERAL
·
2024
·
IF 4.7
Rui Zhu,Yaxin Wang,Minshu Cui
A strategy for the photocatalytic conversion of α-amino acids into corresponding amides was developed. A series of carbon nitride samples were prepared as the catalyst. Various characterizations of the catalyst indicated that effective photocatalytic activity and low recombination efficiency of photo-generated carriers were significant for the high activity of the catalyst. Reaction conditions for the photocatalytic decarboxylation of α-amino acids were optimized, alongside an investigation into the potential mechanism through controlled experiments and DFT computations. Mechanism studies unveiled that photo-generated electrons activated O 2 to reactive oxygen species, while photo-generated holes induced the decarboxylation reactions by activating the carboxylic acid groups, generating carbon radicals that ultimately lead to the formation of corresponding amides under the influence of reactive oxygen species. Moreover, the photocatalytic decarboxylation of different alpha amino acids was also discussed, providing new strategies for the formation of amides and lactams.
研究领域:
有机化学
·
催化化学
✓ 已验证
DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 9
·2419
·
IF 3.623
Mingfei Chen,Yingxue Tu,Songhai Wu
There is an urgent need to develop catalytic degradation technologies for chemical warfare agents (CWAs) that are environmentally friendly and do not require secondary treatment. UiO-66-NH2and other metal–organic frameworks (MOFs) based on zirconium have been shown to promote the catalytic degradation of CWAs. At the same time, MOFs have been studied, and they have shown interesting properties in CWA removal because of their ultrahigh surface area, tunable structures, and periodically distributed abundant catalytic sites. However, MOFs synthesized by conventional methods are mostly powdery crystals that are difficult to process and have poor mechanical stability, which largely limit the development of MOFs in practical applications. An emerging trend in MOF research is hybridization with flexible materials. Polymers possess a variety of unique attributes, such as flexibility, thermal and chemical stability, and process ability, and these properties can be combined with MOFs to make a low-cost and versatile material that also provides convenience for the subsequent integration of such MOFs into independent substrates or textiles. In this article, we used a green and simple method to coat the surface of UiO-66-NH2with polydopamine (PDA), PDA can promote the catalytic hydrolysis of UiO-66-NH2to DMNP (a simulant of chemical warfare agents). Additionally, it can adsorb the toxic hydrolysis product p-nitrophenol, avoiding the trouble of secondary treatment. The half-life of UiO-66-NH2coated with polydopamine (UiO-66-NH2@PDA) for catalytic hydrolysis is 8.9 min, and that of pure UiO-66-NH2is 20 min. We speculate that the surface coated with PDA can improve the diffusion of DMNP to the active sites of UiO-66-NH2.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
MINERALS ENGINEERING
·
2014
·
IF 1.714
An Liu,Min-qiang Fan,Pan-pan Fan
In this study, a modification of oil assisted flotation processes of quartz particles has been proposed, which is based on introduction of miscible Dodecylamine (DDA)-Kerosene as collector with DDA cationic surfactant coated on kerosene to the hydrophilic quartz particles in the pulp. The property of miscible DDA–Kerosene emulsion was investigated. Due to the adsorption of DDA at kerosene/water interface, a smaller and uniform kerosene emulsion formed. Addition of cationic surfactant to the kerosene emulsion changed the zeta potential value from negative to positive, which resulted in enhancing the adhesion of the oil droplets to negatively charged quartz. The results showed that agglomeration and flotation process can be realized simultaneously with DDA–Kerosene. The agglomeration of fine quartz minerals in the presence of miscible DDA–Kerosene led to the formation of very large compact agglomerates resulting in increasing hydrophobicity of the particles and inducing a higher probability of collision and adhesion to air bubble. Experimental data indicated that miscible DDA–Kerosene had better selectivity and stronger collectability to quartz than DDA–HCl, which can be used as an efficient collector in the reverse flotation of magnetic separation concentrate of TISCO. At the same DDA dosage (60 g/t), separation efficiency got to 18.53% when using DDA–HCl as collector; while a better result was obtained with DDA–Kerosene, the efficiency of separation reached 59.07% which was identical with 120 g/t DDA–HCl.
研究领域:
矿物加工工程
·
表面与界面化学
·
胶体与界面科学
·
资源综合利用
·
浮选药剂
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 38
·13336-13341
·
IF 7.059
Gaoping Xu,Leipeng Zhang,Bo Wang,Zichen Ren,Xi Chen,Shuliang Dou,Feifei Ren,Hang Wei,Xiaobai Li,Yao Li
Flexible polyaniline films doped by H2SO4–HClO4 multiple acids were synthesized, and for the first time, their electrochromic mechanism was studied via optical characterizations from the aspects of polarons and roughness. The electrochromic device based on the doped polyaniline films as the active material exhibits Δε of 0.47 in 8–14 μm and reflectivity higher than 80% in 250–400 nm, which can be integrated with the white snow environment in the UV-vis-infrared spectroscopy due to the sunlight scatter from the abundant micropores. In addition, the device exhibits a superior fast electrochromic behavior and stability of more than 200 cycles without compromising its performance. More importantly, the finite-element method and experimental results demonstrate that the device can achieve thermal management upon flat and twisted configuration. The flexible device shows promise for a broad range of potential applications in optical and thermal regulation systems.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Energetic Materials Frontiers
·
2021
·
IF 0
Yang Liu,Yang Guo,Li-han Fei,Zhao-ming Mai,Cheng-long Tang,Zhi Wang,Ying-tao Wu,Zuo-hua Huang
Ionic liquids have a wide engineering application foresight due to their easy and safe storage and handling while are limited by the unclear mechanism of hypergolic ignition. In this study, three dicyanamide-based ionic liquids with different cations, 1-allyl-3-methyl imidazolium ([AMIm]), 1-ethyl-3-methylimidazolium ([EMIm]) and 1-butyl-3-methyl-imidazolium ([BMIm]), are prepared to react with white fuming nitric acid through drop tests. The diameter of ionic droplet is 2.2 mm, the impact velocities are controlled at 0.16/0.45/0.62/0.82/1.01 m s -1 by adjusting the dropping height, and the whole reacting process is recorded by three cameras to provide macroscopic, microscopic and infrared details. The promotion effect of impact velocity on hypergolic ignition probability is confirmed for all the ionic liquids, and the minimum impact velocity for successful hypergolic ignition of each ionic liquid was determined. The temperature evolution of hypergolic process shows a non-monotonic trend, and a four-stage process was performed to reveal the hypergolic mechanism. The experimental results indicate that short-chain alkyl and unsaturated substituents in cations are favored for hypergolic ignition, and the datasets are conducive for kinetic model construction.
研究领域:
化学工程
·
燃料科学
✓ 已验证
DOI
ChemNanoMat
·
2024
·Vol. 11
·期 1
·e202400426
·
IF 2.6
Yiting Wang,Xinran Zhao,Ruirui Cao,Jun Yang
The selection and optimization of cathode materials are crucial for enhancing the performance of aqueous zinc-ion batteries. In this work, different active materials were created by combining Sulfur powder and polydopamine in four different mass ratios. The novel N-doped carbon/WS 2 is obtained. Thanks to the optimization of the dopamine-carrying tungsten ion precursor and Sulfur powder (1 : 2, 1 : 4, 1 : 6 and 1 : 8), the four samples exhibited different morphology. The N−C/WS 2 -6-based zinc ion batteries with the highest specific capacity, 120.0 mAh/g in the first discharge at 2.0 A/g, and 78.0 mAh/g after 2500 cycles, with a capacity retention of 65 %, had a relatively good overall performance, according to the results. The reaction kinetics characteristics of the N−C/WS 2 -6 cathode reveal that diffusion has a significant impact on the processes in the aqueous zinc ionic material N−C/WS 2 -6.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2019
·Vol. 38
·期 1
·53-62
·
IF 2.804
Chen Tao,Zhong Guo-Cheng,Zhang Yuan-Ting,Zhao Li-Ming,Qiu Yong-Jun
Novel bio-based and biodegradable block copolymers were synthesized by “click” reaction between poly(L-lactide) (PLLA) and polyamide 4 (PA4). Upon tuning the molar mass of PLLA block, the properties of copolymers and electrospun ultrafine fibers were investigated and compared with those of PLLA and PA4 blends. PLLA and PA4 were found incompatible and formed individual crystalline regions, along with reciprocal inhibition in crystallization. Electrospun fibers were highly hydrophobic, even if hydrophilic PA4 was the rich component. The crystallinity of either PLLA or PA4 decreased after electrospinning and PLLA-rich as-spun fibers were almost amorphous. Immersion tests proved that fibers of block copolymers were relatively homogeneous with micro-phase separation between PLLA and PA4. The fibrous structures of copolymers were different from those of the fibers electrospun from blends, for which sheath-core structure induced by macro-phase separation between homopolymers of PLLA and PA4 was confirmed by TEM, EDS, and XPS.
研究领域:
材料科学
·
生物学
✓ 已验证
DOI
高影响因子
Food & Function
·
2019
·Vol. 10
·期 2
·625-634
·
IF 3.241
Jieyu Wu,Rongfa Guan,Haizhi Huang,Zhenfeng Liu,Haitao Shen,Qile Xia
The instability of catechins (CT) is currently a challenge for their application in the food industry. This study explored whether or not the protective effects of liposome encapsulation on CT could enhance the role of CT as antioxidants in reducing nitrosamines (NAs) in traditional Chinese bacon (TCB). The samples were further characterized by the analysis of volatile compounds, color parameters, and texture profile during storage to assess the effects of catechin liposomes (CTL) on TCB. Results showed that the increase in NAs in fried TCB was strongly dependent on the storage time. CTL could reduce the production of NAs in fried TCB (40.45%) more strongly than CT (15.13%) after 49 days of storage. Higher phenol contents were found in CTL (1515.25 × 106 area unit (AU)) than those in control (1451.73 × 106 AU) and CT (1391.10 × 106 AU) TCB at the end of storage. The addition of antioxidants increased (p < 0.05) a* values in the following order: CTL > CT > control with mean values of 6.54, 5.09, and 3.92, respectively, after 49-day storage. Conversely, the addition of CTL decreased (p < 0.05) the hardness of TCB. Encapsulating CT in the liposomes can effectively reduce the NAs in TCB and positively affect its quality. This technique may guide the potential application of liposomes in the meat industry.
研究领域:
食品科学
·
生物学
·
营养学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 27
·9252-9261
·
IF 6.4
Yuehong Luo,Kaijin Chen,Wenhui Wang,Ruxin Bei,Chuying Li,Yubo Long,Zhuxin Zhou,Siwei Liu,Zhenguo Chi,Jiarui Xu,Yi Zhang
A large Stokes-shifted fluorescent imide (HBTN-MC) and its related polyimides (HBHBTNms and HPHBTNms) were first designed and synthesized by introducing an excited state intramolecular proton transfer fluorophore 2-(2′-hydroxyphenyl)benzothiazole (HBT). The imide exhibited a large Stokes shift of 9654 cm−1 in the dichloromethane solution and 7648 cm−1 in the solid state. Based on the experimental and theoretical methods, the photophysical properties and the excited state intramolecular proton transfer (ESIPT) process of HBTN-MC have been systematically studied. The performances of the polyimides have been optimized by changing the alicyclic dianhydride and adjusting the copolymerization ratio. The as-prepared polyimide films retained the ESIPT performance with a large Stokes shift of larger than 8105 cm−1, a high photoluminescence quantum efficiency (φ) of 29%, decent colorless and transparency, high thermal performance (Td, 5% = 468 °C and Tg > 260 °C), and solubility in both conventional aprotic and protic solvents. In short, the newly developed imide and polyimides provide good examples for the development of ESIPT polymers with controllable emission wavelengths as well as high thermal, environmental, and radiation stability.
研究领域:
材料科学
·
聚合物化学
·
光学材料
·
荧光材料
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2024
·Vol. 31
·期 3
·1-13
·
IF 2.6
Li Shuo,Tao Yulun,Wu Yuannan,zhu Shanshan,Khademi Sara,lv Yinru,Tai Yanlong,Wang Chaoran
The high integration and multifunctionality in flexible electronic device play an important role in its development. In this study, we developed multifunctional hydrogels integrated with supercapacitive, photoelectric, and strain-sensing capabilities. The hydrogel composite consists of PAM/PVA matrix with polyaniline (PANI) and reduced graphene oxide (rGO) as conductive components. Two different acid dopants, citric acid (CA) and hydrochloric acid (HCl), were employed to investigate their impact on photoelectrochemical capabilities of hydrogels. Both CA-doped and HCl-doped hydrogels exhibited remarkable supercapacitive performance, achieving areal capacitances of 492 mF/cm 2 and 538 mF/cm 2 , respectively. Furthermore, both hydrogels demonstrated photosensitivity towards shorter wavelengths such as ultraviolet (380 nm) and blue (475 nm) light. Lastly, the proposed hydrogels serving as highly sensitive strain sensors was verified through effectively sensing arm bending movements.
研究领域:
材料科学
·
电化学
·
光电子学
·
传感器
·
纳米技术
✓ 已验证
DOI
高影响因子
Journal of Saudi Chemical Society
·
2024
·
IF 5.8
Yong Zhang,Mei Zhu,Kun Hu,Xing Liu,Yue Zou,Jixiang Chen
Fluopyram is a highly effective agricultural fungicide targeting succinate dehydrogenase (SDH). Twenty-six novel amide derivatives containing azetidine were designed and synthesized with fluopyram as the lead, and their biological activities were tested. The results showed that some compounds had obvious antifungal activities against Phomopsis sp., among them, the EC 50 value of compound C24 was 5.7 mg/L, which was significantly better than fluopyram (105.4 mg/L). The curative and protective activities of compound C24 on kiwi fruit infected with Phomopsis sp. were 42.2 and 52.9 %, which were better than that of fluopyram (30.4 and 35.6 %) at 200 mg/L. Moreover, compound C24 exhibited excellent inhibitory against SDH. The results of scanning electron microscopy (SEM) indicated that the mycelium of Phomopsis sp. collapsed or even ruptured after compound C24 treatment. Meanwhile, molecular docking showed that compound C24 was deeply embedded into the SDH binding pocket, and the binding model was stabilized by a cation–π interaction with Cys-40, Tyr-58 and an H-bond with Lys-455 and Asn-452. Compound C24 can provide a valuable idea to find new succinate dehydrogenase inhibitors.
研究领域:
农业化学
·
药理学
·
真菌学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2020
·
IF 3.762
Hui Peng,Shengliang Qi,Qian Miao,Rui Zhao,Yipu Xu,Haikuo Lei,Fei Wang,Guofu Ma,Ziqiang Lei
Herein, novel polyimide (PI) nanoflowers with intertwined nanosheets is synthesized by one-step hydrothermal "bottom-up" self-assembly crystal growing process by using low-cost aromatic diamine and dianhydride as monomers. Then, hierarchical polyimide-based porous carbon nanoflowers (PI-CNFs) are prepared by synchronous activation and catalytic carbonization approach utilizing polyimide as carbon precursor and FeCl 3 as activating agent and catalyst. Owing to its unique interlaced porous nanosheet structure, high specific surface area and high nitrogen doping content, the PI-CNFs possesses high specific capacitance, capacity rate performance and overlength cycle life. In addition, a novel symmetrical aqueous supercapacitor assembled with PI-CNFs has a large operating voltage of 2.0 V, a high specific energy of 18.3 Wh kg −1 at specific power of 500 W kg −1 , as well as excellent cycling stability. Therefore, this work will propose an affordable strategy for designing novel polymer nanosheets, and open up the possibility of easy preparation, environmentally friendly and low-cost synthetic polymers-based carbon nanosheets to meet the energy storage demands.
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）