CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Le Ma,Xiansheng Li,Xuehan Chen,Jingyu Li,Pengfei Liu,Changting Wei,Qingshan Ma,Leimeng Xu,Wenhua Zhang,Jizhong Song
Mixed halide CsPb(Br/Cl) 3 quantum dots (QDs) exhibit fine tunable blue light and narrow photoluminescence (PL) full-width at half-maximum (FWHM), which has attracted significant attention as a promising candidate to realize a new generation of blue light technology. However, the introduction of Cl − makes it very easy to be eroded by water in the environment, which will lead to deep-level defects and degrade the luminescence and stability of QDs. Here, we propose to introduce tetra- n -octylammonium oxalate (TOAOxa) to improve the water-resistance stability and exciton recombination of CsPb(Br/Cl) 3 QDs and QD-based light-emitting diodes (QLEDs). The oxalate ion (Oxa 2− ) of TOAOxa could form strong interaction with undercoordinated Pb 2+ on CsPb(Br/Cl) 3 QD surface, which was confirmed by FTIR and XPS analysis. Oxa 2− passivated QDs (Oxa-QDs) exhibited improved photoluminescence quantum yield (PLQY) and enhanced water-resistance stability compared to pristine QDs. For example, after soaking in water–acetone co-solvent for 1 h, Oxa-QDs can maintain the initial cubic morphology and 43.9% of initial PL intensity, while the morphology and luminescence of pristine QDs are almost damaged. Based on the above concept, the Oxa-QD-based QLED presented a maximum external quantum efficiency (EQE) of 4.0%, and operational lifetime (T 50 ) of 84 s, which was a 5-fold enhancement in EQE, and 7-fold enhancement in stability compared to pristine QLED, respectively. Besides, the Oxa-QD-based QLED exhibits better stability in high-humidity air. To sum up, the Oxa 2− passivation strategy has significantly improved the efficiency and water-resistant stability of QDs and devices and would rapidly promote the development of blue-emitting QDs.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xiaoping Jiang,Yue Guo,Lixi Wang,Qitu Zhang
Dynamic photoluminescence and photochromism are two critical technologies applied in advanced anti-counterfeiting and encryption. In this work, an innovative phosphor of CaAl 12 O 19 :Eu 2+/3+ combining the features of dynamic photoluminescence and photochromism is developed for the first time. After being irradiated by a portable 254 nm ultraviolet lamp, the photoluminescent color of the phosphor can dynamically change from red to magenta in dark field, and the surface color can dynamically alter from white to light brown in bright field. Based on these two appealing features, an application in advanced anti-counterfeiting and encryption is designed which can write, encrypt, and erase information successfully, thus guaranteeing information security. Furthermore, a composite material of CaAl 12 O 19 :Eu 2+/3+ /PDMS is fabricated for application in advanced anti-counterfeiting and encryption in both dark and bright fields, which is difficult to be replicated.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xingyu Chen,Yeqing Guan,Zhaolin Zhong,Fenglin Wang,Wei Li,Haijun Mao,Zhuofeng Liu,Weijun Zhang
The effect of Zr 4+ substitution for Ti 4+ on the phase evolution and microwave dielectric properties of (Cu 1/3 Nb 2/3 ) 0.25 Ti 0.75- x Zr x O 2 (0 = x ≤ 0.35) ceramics prepared via conventional solid-state method has been investigated. With the increase of Zr substitution, the ceramics exhibit a gradual phase transition from a tetragonal rutile phase to an orthorhombic srilankite phase, where the synthesis of the srilankite phase at atmospheric pressure and temperature below 1200 °C in this study is reported for the first time. The crystal structure is tetragonal rutile type for the unsubstituted composition, orthorhombic srilankite type for the compositions with x > 0.30, and the compositions in between is a two-phase region with a mixture of rutile and srilankite. The Zr substitution has a great influence on the microstructure of the ceramics. In particular, for compositions where x > 0.1, the grain boundaries are surrounded by elongated powdery particles. The microwave dielectric properties of the ceramics are closely related to the phase transition process, in which Q × f is significantly improved and τ f decreases almost linearly with the increase of the content of srilankite phase. Optimum microwave dielectric properties with a permittivity of 35.1, a Q × f value of 7270 GHz, and a near-zero τ f of 9.0 ppm/°C are obtained in the ceramics with x = 0.3 sintered at 1150 °C for 4 h, which provides a new option for microwave devices requiring medium-permittivity dielectric ceramics .
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2022
·
IF 5.6
Mu Yang,Qilin Dai,Aiwei Tang,Feng Teng,Hong-shang Peng
Current chloride-bromine mixed perovskite quantum dots (PQDs) suffered from low luminescence efficiency and instability due to migration-nature of ionic species and high defect density. To tackle these challenges, herein a novel type of CH 3 NH 3 Pb(Cl/Br) 3 PQDs (Cl/Br-PQDs) were synthesized via a two-step method. Briefly, pristine silane-capped Br-PQDs were prepared, followed by anion exchange using oleylammonium chloride (OAm-Cl) and in-situ formation of silica shell. The optimal feeding ratio of Cl/Br was determined to be 1:1, which yielded colloidal Cl/Br-PQDs possessing a strong 464-nm emission, a high photoluminescence quantum yield of 94.6% and ultrahigh stability. The high quantum yield was attributed to efficient defects passivation by doped Cl − ions and silica-shell-locked OAm + ligands, whilst the high stability was to silica-shell-restricted migration of halogen ions. Such a combinational strategy of anion exchange and in-situ growth of silica shell may provide an effective solution for synthesis of mixed PQDs with high quality.
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ACS ES&T Water
·
2022
·
IF 0
Jian Li,Pei Xiao,Jie Yu,Lei Li,Yiyun Zhang,Yun Ma,Fei Liu,Yi Li
Nanofiltration (NF) technology is attractive in desalting and concentrating dyeing wastewater in the textile industry. A highly efficient NF membrane is critical in reducing the cost of the process. Here, a facile and reliable approach to prepare an NF membrane for the selective separation of dye/salt is proposed by surface grafting of 3-aminopropyltriethoxysilane (APTES) on a fresh polyamide (PA) layer after interfacial polymerization (IP). A thin layer of APTES with a thickness of ∼64 nm was found successfully covalently bonded onto the PA surface via esterification and amidation reactions. The thin-film composite (TFC)-1.0 membrane grafted with 10% APTES achieved a high water permeance of 44.8 L m–2 h–1 bar–1, which was 4.7 times higher than that of the control TFC membrane. Interestingly, the rejection of monovalent salt (NaCl, 11.5%) and divalent salt (Na2SO4, 17.2%) decreased significantly, while the rejection for different dyes (Congo red, reactive blue-19, Coomassie blue G-250, and methyl blue) remained over 99.0%. These noticeable changes in separation performances could be attributed to the large pore size of the active layer, resulting from the interference of APTES on the post-cross-linking of a PA network. The poly(ethylene glycol) (PEG) filtration experiments confirmed that the mean pore size of the membrane was enlarged significantly from 0.51 to 1.17 nm after surface modification. Finally, the modified membrane showed good long-term stability and excellent separation efficiencies in fractionation of a high salinity Congo red/NaCl (0.2/50 g L–1) mixture. Overall, this work provides a practical strategy to prepare a permeable and selective NF membrane for dye and salt separation by surface grafting of the nascent PA layer.
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EUROPEAN JOURNAL OF NEUROSCIENCE
·
2022
·Vol. 57
·期 1
·64-77
·
IF 3.698
Weimin Ni,Jie Zhang,Bing Wang,Feng Liang,Long Bao,Pengfei Li,Yan Fang
Obesity is a major health crisis in the modern society. Studies have shown that the consumption of a high-fat diet (HFD) induces hypothalamic inflammation and leptin resistance, which consequently favours body mass gain. Actin related protein 2/3 complex subunit 1 (ARPC1B), an actin-binding protein, is highly expressed in immune cells. Recent studies have shown that ARPC1B has a certain anti-inflammatory effect. While ARPC1B expression is decreased in the hypothalamus of mice fed a HFD, the role of ARPC1B in HFD-induced obesity remains unclear. Thus, we investigated whether ARPC1B up-regulation in the hypothalamic arcuate nucleus (ARC) could inhibit the development of obesity. Herein, ARPC1B overexpression lentiviral particles were stereotaxically injected into the ARC of male C57BL/6J mice (7 weeks old) fed with HFD. Overexpression of ARPC1B in the hypothalamic ARC attenuated HFD-induced ARC inflammation, reduced body-weight gain and feed efficiency. Furthermore, up-regulation of ARC ARPC1B improved the glucose tolerance and reduced subcutaneous/epididymal fat mass accumulation, which decreased the serum total cholesterol, serum triglyceride and leptin levels. In addition, upon ARPC1B overexpression in the hypothalamic ARC, intraperitoneal injection of leptin increased the phosphorylation level of signal transducer and activator of transcription 3 (STAT3), an important transcription factor for leptin's action, in the ARC of obese mice. Accordingly, we suggest that up-regulation of ARPC1B in the hypothalamic ARC may improve the HFD-induced hypothalamic inflammation and leptin resistance. Our findings demonstrate that ARPC1B is a promising target for the treatment of diet-induced obesity.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2022
·
IF 4.889
Nan Jiang,Long Chen,Yitao Wang,Hao Jiang,Yanjie Hu,Chunzhong Li
Sodium-ion batteries have been extensively studied due to their high safety and high natural abundance characteristics. Na 3 V 2 (PO 4 ) 3 (NVP) cathode materials, which have extraordinary rate performance and cycle stability, have become among the most promising cathode materials for commercialization. However, due to their low conductivity problem, it is still a serious challenge to develop a nanocrystalline and uniform conductive frame structure. This work reports a confinement reaction strategy derived from the chelation reaction, which can successfully realize electrode materials with adjustable internal NVP grains. The obtained ultrasmall grained carbon frame material showed to have ultrahigh rate performance, and it could reach 101 mAh g −1 at 100C and 100 mA h g −1 after 1800 cycles at 10C rate (capacity retention rate 99%). Moreover, it showed the characteristics of excellent low-temperature performance, and no capacity degradation at − 20 °C after 1000 cycles.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Feng Chen,Xinqi Zhu,Weilong Dai,Congcong Yao,Junchao Qian,Zhigang Chen,Chengbao Liu
The high nickel cathode LiNi 0.83 Co 0.06 Mn 0.06 Al 0.05 O 2 (combination of NCM and NCA) coated with the Li + conductor Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 in various mass fractions was prepared via using the typical sol-gel process. The LiNi 0.83 Co 0.06 Mn 0.06 Al 0.05 O 2 after the Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 covering demonstrated the similar crystal structure and particle morphology in comparison with the bare cathode. The electrochemical test results indicated the superior rate capabilities and cycling performances were acquired for the coated cathodes due to the presence of the Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 film on the surface of LiNi 0.83 Co 0.06 Mn 0.06 Al 0.05 O 2 . The 2 wt% Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 covered LiNi 0.83 Co 0.06 Mn 0.06 Al 0.05 O 2 exhibited the greatest electrochemical performance with a large cycle retention rate of 90.9% over 300 cycles at 45 °C, rate capacity of 139.8 mAh g −1 at 5 C current density, and a high capability of 126.5 mAh g −1 at − 30 °C, superior than those (80.9%, 99.8 mAh g −1 , 71.3mAh g −1 accordingly) of the bare cathode. In addition, the safety and environmental reliability tests of pouch batteries suggested the Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 film on the surface of cathode acted as a protective layer to promote the stability for application.
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高影响因子
IONICS
·
2022
·Vol. 28
·期 10
·4631-4639
·
IF 2.961
Huang Hong-bo,Liu Cai-ling,Yang Yue,Luo Shao-hua
Na 3 V 2 (PO 4 ) 3 with NASICON structure is regarded as a hopeful cathode in sodium-ion batteries (NIBs). Nevertheless, the immanently inferior electronic conductivity significantly restricts its electrochemical performance and practical application. In this work, a facile solid-state sintering approach employing citric acid as both the reduction agent and carbon source has been developed to prepared Na 3 V 2 (PO 4 ) 3 /C composite. The influence of different sintering temperatures on the structure, morphology, and electrochemical performance of Na 3 V 2 (PO 4 ) 3 /C for NIBs was systematically investigated. The results indicate that the Na 3 V 2 (PO 4 ) 3 /C sample calcined at 850 °C (NVP/C-850) presents the best electrochemical property among the as-obtained four NVP/C samples studied. The optimized NVP/C-850 composite exhibits a reversible capacity of 117.4 mAh/g at 0.2 C, and after 100 cycles, capacity retention of 94.7% was kept. Besides, among the four electrodes, NVP/C-850 electrode exhibited smallest resistance and highest Na + diffusion coefficient. Thus, the outstanding results demonstrate potential application of the NVP/C for NIBs.
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Reaction Chemistry & Engineering
·
2022
·Vol. 7
·期 8
·1742-1749
·
IF 5.2
Chaoqiang Wu,Chengyong Wang,Alei Zhang,Kequan Chen,Fei Cao,Pingkai Ouyang
3-Acetamido-5-acetylfuran (3A5AF) is an important platform compound, possessing very promising application prospects. Herein, we propose a new approach to convert N-acetylglucosamine (NAG) and chitin to 3A5AF using biobased deep eutectic solvents (DESs) containing choline chloride and various organic acids or polyols. A comparison of catalytic capacity showed that a DES made with choline chloride/citric acid (CCCA) possesses the optimum catalytic properties, which lead to a maximum yield for 3A5AF of 47.1 mol% and 5.0 mol% from NAG and chitin, respectively, at 210 °C in N,N-dimethylacetamide solvent with CaCl2·2H2O as an additive. Moreover, CCCA showed excellent recyclability and retained over 63.6% of its original activity after five cycles of use. In addition, the 3A5AF product was obtained with 99.0% purity by simple extraction and crystallization. This research provided a new avenue for 3A5AF production from renewable chitin resources.
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SOLAR ENERGY
·
2022
·
IF 7.188
Guangcheng Wu,Xuting Dong,Guanglei Cui,Rui Sun,Xianhu Wu,Min Gu,Zewen Zuo,Yong Liu
Poly(3-hexylthiophene) (P3HT) based devices possess potential toward low-cost and easy fabrication for high-performance perovskite solar cells (PSCs). However, these devices currently suffer from stability and relative low performance. Herein, a gradient mixed-cation perovskite is obtained by a facile strategy of tailoring MAPbI 3-x Cl x , in which MAFAPbI 3-x Cl x were constructed in ambient air by directly spin-coating FAI onto perovskite intermediate phase. The pristine device shows an inferior power conversion efficiency (PCE) of 13.71%, whereas the as-optimized device achieves a PCE of 16.26%. A gradient distribution of FA cation is revealed by crystal unit parameters and energy dispersive spectrometer (EDS). The lifted valence band edge matches better with the HOMO of P3HT, thus resulting in the faster charge extraction. In addition, the reduced trap states lead to the enhanced crystallinity and the mitigation of perovskite/P3HT interface, and then the stability is significantly enhanced. Our work provides a facile way to improve the performance of P3HT based air-processed PSCs, which can bring these devices closer to low-cost commercial applications.
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OPTICS EXPRESS
·
2022
·Vol. 30
·期 8
·12409-12419
·
IF 3.833
Le Zheng,Chen Wei,Hongrong Zhou,Fanxi Sun,Ang Gao,Dongsheng Wang,Dongsheng Wang,Yong Liu
Pulsed lasers operating in the mid-infrared are of great importance for numerous applications in spectroscopy, medical surgery, laser processing, and communications. In spite of recent advances with mid-infrared gain platforms, the lack of a capable pulse generation mechanism hinders the development of compact mid-infrared pulsed laser source. Here we show that MIL-68(Al) and MIL-68(Fe), which are aluminum- and iron- based metal-organic frameworks (MOFs) with ordered atoms distribution and periodic mesoporous structure, constitute exceptional optical switches for the mid-infrared. We fabricated the MIL-68(Al) and MIL-68(Fe) via hydrothermal method and prepared reflection-type MIL-68(Al)- and MIL-68(Fe)- saturable absorber mirrors (SAMs). By employing the as-prepared SAMs in the laser cavities, we achieved high-power nanosecond Q-switched fiber lasers at 2.8 µm. Especially, the average output power and pulse duration of the MIL-68(Al) Q-switched fiber laser reached 809.1 mW and 567 ns, respectively. To the best of our knowledge, this is the first time to demonstrate that MIL-68(M) can be efficient optical switches for 3-µm mid-IR laser pulses generation. Our findings reveal that MIL-68(M) is promising saturable absorber for compact and high-performance mid-infrared pulsed lasers.
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