NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
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2016
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IF 1.389
Jinpeng Lv,Chundong Li
The discrepancy between sub-bandgap absorption in ZnO induced by thermal annealing and H + implantation is investigated in this study for the first time. Results indicate that nonreductive annealing-induced optical absorption is independent of annealing ambient, and can be assigned to V O , whereas the absorption centers caused by H + implantation and H 2 annealing are primarily associated with V O and ionized Zn i .
研究领域:
材料科学
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半导体物理
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光电子学
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JOURNAL OF MATERIALS SCIENCE
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2022
·Vol. 57
·期 42
·19799-19816
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IF 4.682
Zhu Jishi,Li Xinshuo,Yang Rui,Wen Jin,Li Xiaoke
The widespread application of solar-thermal absorbers is currently hindered by their low absorption efficiency and high capital cost. Therefore, many initiatives, including direct absorption solar collectors (DASCs), are currently under way to improve the efficiency of the absorbers. In this regard, the application of TiN-modified h-BN nanosheets in DASCs is studied in this paper. Their superior solar absorptivity and thermal conductivity are based on the plasma plasmon effect of nanoparticles and the high thermal conductivity of h-BN nanosheets, respectively. In the experiment, five different concentrations (20, 40, 60, 80, 100 ppm) of TiN@h-BN composite nanofluids were prepared by a two-step method. The stability and optical properties of the nanofluids were analyzed. In addition, thermal loss and exergic efficiency of photothermal conversion system were analyzed and discussed. Combined with localized surface plasmon resonance (LSPR) of TiN nanoparticles and h-BN light reflection properties, the photothermal conversion of TiN@h-BN composite nanofluids was improved in DASCs. The 80 ppm nanofluid showed the best exergic efficiency, with an average exergic efficiency of 83%. Meanwhile, the photothermal conversion efficiency of 80 ppm TiN@h-BN composite nanofluid reaches the maximum 78%. This work provides new strategies for harnessing the full spectrum of solar energy and controlling the photothermal properties of nanofluids. Graphical Abstract Schematic diagram of photothermal conversion system of TiN@h-BN nanofluids.
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MOLECULES
·
2023
·Vol. 28
·期 8
·3574
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IF 4.6
Mengyu Li,Liyang Nan,Boxuan Zhang,Junjun Kong,Yufeng Wang,Miao Ba
By introducing thiourea and ether groups into MQ silicone resin polymer via free radical polymerization, a polyether-thiourea-siloxane (PTS) copolymer was synthesized. The characterization of the synthesized copolymer indicated the occurrence of H-bonding interactions and a narrow molecular weight polydispersity index. Antifouling coatings were produced by incorporating the synthesized copolymer and phenylmethylsilicone oil (PSO). The addition of a minute amount of copolymer enhanced the hydrophobicity of the coating by increasing its surface roughness. However, excessive addition of copolymer resulted in a significant deterioration of the coating surface smoothness. The copolymer improved the mechanical properties of the coating, but excessive addition decreased the crosslinking density and weakened the mechanical performance. With increasing copolymer addition, the leaching of PSO was significantly improved due to the change in the storage form of PSO in the coating caused by the copolymer. Based on the H-bonding interaction of the copolymer, the adhesion strength between the coating and the substrate was significantly improved. However, excessive addition of copolymer did not infinitely enhance the adhesion strength. The antifouling performance demonstrated that an appropriate amount of copolymer could obtain adequate PSO leaching efficiency, thereby effectively enhancing the antifouling performance of the coating. In this study, the prepared coating P12(12 g of PTS in 100 g of PDMS) showed the most effective antifouling performance.Keywords:marine antifouling;copolymer;H-bonding interaction;leaching;fouling release
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PubMed
高影响因子
Journal of Analysis and Testing
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2024
·Vol. 8
·期 1
·1-8
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IF 5.5
Tu Mengling,Zhang Wei,Zhu Yunxiao,Ma Wen,Li Xiao,Zhou Shukun,Li Hongmei,Li Xianjiang
Thiacloprid is the first-generation neonicotinoid insecticide, which is widely used in modern agriculture. Reference materials are essential for sound measurement and traceability of results in chemical analysis. Pure thiacloprid was comprehensively assessed by two orthonormal methods: mass balance (MB) and quantitative nuclear magnetic resonance spectroscopy (qNMR). From MB, its mass fraction value was 998.4 mg/g with the subtraction of structurally related impurities (99.87%), inorganic impurities (0.006 mg/g), water (0.33 mg/g), and volatile organic solvent (0 mg/g). To guarantee sufficient separation of structurally related purity, peak purity of thiacloprid was evaluated by five points of UV spectra. From the qNMR of hydrogen, its mass fraction value was 995.7 mg/g which was traced to the internal standard (methyl sulfone). Finally, the certified value was assigned to 997 mg/g, together with an expanded uncertainty of 3 mg/g ( k = 2). This high-purity thiacloprid can be applied to routine monitoring in agriculture and the food fields.
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Asian Journal of Organic Chemistry
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2017
·Vol. 7
·期 1
·240-247
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IF 2.788
Rui Yan,Zhong-Xia Wang
Graphical Oxidative coupling of allylic alcohols : [Cp*RhCl 2 ] 2 was demonstrated to catalyze the oxidative coupling of alkenylpyridines with allylic alcohols through alkenyl C−H activation in the presence of AgOTf and AgOAc to afford β-alkenyl ketones and aldehydes in moderate to good yields. [Cp*RhCl 2 ] 2 was demonstrated to catalyze the oxidative coupling of alkenylpyridines with allylic alcohols through alkenyl C−H activation in the presence of AgOTf and AgOAc to afford β-alkenyl ketones and aldehydes in moderate to good yields. Allylic alcohol, 1-aryl and 1-alkyl allylic alcohols can be coupled with various alkenylpyridines. The reaction occurred at the γ-position of allylic alcohols and the cis -β-position of the alkenylpyridines.
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CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2013
·Vol. 92
·期 5
·851-860
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IF 1.003
Zhenhua Pan,Qizhou Cai,Qiang Luo,Xinwei Li
The mechanism and kinetics of synergetic effect in TiO 2 /O 3 /UV process on H-acid degradation were investigated. The experimental results showed that H-acid removal rate of TiO 2 /O 3 /UV process was the highest among TiO 2 /UV, O 3 /UV and TiO 2 /O 3 /UV processes. The investigation of reactions with suitable active species scavengers confirmed that H-acid was mainly oxidised by ozone and holes on TiO 2 in the TiO 2 /O 3 /UV process. The recombination between holes and electrons in TiO 2 reduced in the presence of ozone, as indicated by fluorescence emission spectra. Moreover, the intermediates generated during H-acid oxidation in various processes were analysed by LC/MSD trap. It is proposed that H-acid was oxidised to polyhydroxy aromatics, benzene carboxylic acids and quinoids in the first step. Then, saturated aliphatics carboxylic acids were formed and mineralised to inorganic compounds through the Photo-Kolbe reaction. Finally, a kinetic study on TiO 2 /UV, O 3 /UV and TiO 2 /O 3 /UV processes was conducted and it was confirmed that both ozonation and photocatalytic activity were improved in TiO 2 /O 3 /UV process because of the synergetic effect.
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JOURNAL OF CATALYSIS
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2024
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IF 6.5
Gongcheng Sun,Subing Fan,Junmin Lv,Tiansheng Zhao
A hollow zeolite encapsulated Rh catalyst Rh@H-S-1 with an “eggshell” structure was prepared using the method of organic alkali treatment and recrystallization. Compared with catalysts with directly encapsulated Rh@S-1 and surface impregnated Rh/S-1, this catalyst exhibited both superior activity and a higher TOF value in hydroformylation of 1-hexene due to the high dispersion of Rh and high diffusion. The Rh element did not need to be reduced in the preparation, and it was in situ reduced by the syngas. The content of lower valence Rh δ+ gradually increased with the reaction procedure and played as an active center. The low oxidized state Rh + or Rh δ+ in the form of Rh(CO) 2 are proposed as active sites in hydroformylation, which were generated under the synergistic effect between CO and H 2 . Importantly, the hollow encapsulated catalyst effectively decreased Rh leaching to 0.1 ppm and showed better stability compared with the impregnated Rh/S-1 catalyst.
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APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Fangfang Wan,Donghao Ye,Yajin Ye,Jia Wang,Yinyu Xiang
The development of bifunctional Ru-based electrocatalysts with high efficiency for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in acidic electrolytes is highly desirable. However, most Ru-based catalysts display inadequate HER activity and unsatisfactory OER stability. Herein, we present a facile synthesis of a heterojunction catalyst by confining RuO 2 nanoclusters on Fe 3 O 4 nano-capsules substrates (named RuO 2 @Fe 3 O 4 ). The RuO 2 @Fe 3 O 4 , with its unique morphology facilitating efficient site accessibility and rapid mass transfer, exhibits excellent HER activity with a low overpotential of 79.5 mV and a large exchange current density of 1.12 mA cm -2 . Remarkably, RuO 2 @Fe 3 O 4 demonstrates exceptional durability, maintaining 100 h at 100 mA cm -2 with only 5.9% activity decay. Additionally, the RuO 2 @Fe 3 O 4 catalyst displays prominent oxygen OER activity and stability. Density functional theory (DFT) calculations confirm that electron transfer from Fe to Ru optimizes the hydrogen adsorption energy of the Ru site, making it the main active site. This work provides a viable route for developing bifunctional Ru-based catalysts.
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Cell Reports Physical Science
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2025
·
IF 7.3
Run Li,Fan Lan,Aike Xi,Di Gao,Yunrui Li,Ya Huang,Siming Zhao,Yilin Ding,Yanlong Zhao,Rufan Zhang
As an energy-efficient technology, electrochromic devices (ECDs) represent a promising solution for smart windows in buildings and vehicles. However, conventional all-solid-state ECDs suffer from sluggish ion diffusion. Here, we propose a high-performance all-solid-state ECD enabled by a rapid H + transfer pathway. A solid-state polyaniline (PANI) interface serves as an efficient H + reservoir, replacing Li + ions to drive electrochromism in Prussian blue (PB). By integrating a sodium-ion-conducting solid polymer electrolyte (SPE) above PANI, H + ions are selectively pumped into PB via an ion exchange mechanism. The PANI network also stabilizes PB’s framework by preventing anion/solvent intercalation. The optimized ECDs exhibit exceptional performance: fast switching speeds (1.2 s coloration, 3.0 s bleaching), high optical modulation (72.5% at 600 nm), and robust cycling stability (>5,000 cycles with <10% decay). Furthermore, large-area flexible ECDs (20 × 30 cm 2 , ∼0.4 mm thickness) are demonstrated, highlighting their potential as replaceable smart films for energy-efficient buildings and vehicles.
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PubMed
高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Ayesha Tariq,Muhammad Daniyal Ghouri,Kamran Amin,Mathar Hamza,Behroz Khan,Bin Wang
In this study, we presented a gram-scale synthesis and the electrochemical evaluation of niobium-doped, PANI-coated tungsten oxide hexagonal nanowires (NWs) as high-performance anode materials for lithium-ion batteries (LIBs). The polyaniline treatment of the doped NWs significantly enhanced their electrochemical properties as anode materials for LIBs. The PANI-coated, Nb-doped WO3 hexagonal NWs exhibited a 2.59-fold increase in specific capacity and an approximately 8.57-fold increase in the lithium-ion diffusion coefficient compared to bare WO3 hexagonal NWs. The analysis of the charge storage mechanism revealed that the anode kinetics involve both diffusion and surface adsorption processes. Our strategy provides a strong foundation for possible commercialization of the tungsten oxide hexagonal nanowires for next-generation lithium-ion batteries.
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JOURNAL OF ORGANIC CHEMISTRY
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2025
·
IF 3.6
Yi Jin,Ming-Yang Wang,Wei-Long Zeng,Chu-Qiao Li,Wei Li
The dichloromethyl group is a valuable functional motif in bioactive molecules and synthetic chemistry. Despite its utility, the dearomative dichloromethylation of arenes remains a significant challenge and has been largely unexplored. Herein, we develop a chromium η6-coordination-enabled strategy for dearomative 1,2-hydrodichloromethylation of arenes using inexpensive CH2Cl2 as the dichloromethylating source, providing efficient access to dichloromethylated 1,3-cyclohexadienes. Furthermore, by altering the workup to oxidative quenching with I2, this system is extended to formal arene C–H dichloromethylation, delivering dichloromethylated arenes directly. The method features a broad substrate scope, excellent functional group compatibility, and successful application in the late-stage modification of complex drug molecules.
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高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2023
·
IF 3.6
Shuo Li,Xian Xu,Qianlin Sun,Xin Xu
This work reports an intramolecular C(sp3)–H annulation of functionalized 2,6-lutidines catalyzed by an organocalcium hydride [{(DIPPnacnac)CaH(thf)}2] (DIPPnacnac = CH{(CMe)(2,6-iPr2–C6H3N)}2). This reaction constitutes a streamlined approach for producing a new family of tetrahydro-1,5-naphthyridines and hexahydropyrido[3,2-b]azocines derivatives in good to excellent yields with high atom efficiency and broad substrates scope. A calcium alkyl complex was isolated from the stoichiometric reaction between calcium hydride and the substrate through deprotonation, which was structurally characterized and confirmed as the catalytic intermediate.
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