CARBOHYDRATE POLYMERS
·
2013
·
IF 3.479
Lipeng Zhou,Zhen Liu,Meiting Shi,Shanshan Du,Yunlai Su,Xiaomei Yang,Jie Xu
Sulfonated hierarchical H-USY zeolite was prepared and characterized by X-ray diffraction, N 2 physisorption, Fourier transform infrared spectroscopy, inductively coupled plasma atomic emission spectroscopy, temperature-programmed desorption of ammonia, and acid–base titration. It was proved that sulfonic group was successfully anchored onto the hierarchical H-USY zeolite. The acidity of the hierarchical H-USY was remarkably improved. Sulfonated hierarchical H-USY zeolite was efficient for the hydrolysis of hemicellulose and cellulose. The yield of TRS for hydrolysis of hemicellulose reached 78.0% at 140 °C for 9 h. For hydrolysis of α-cellulose, 60.8% conversion with 22.4% yield of glucose was obtained. Even for microcrystalline cellulose, 43.7% conversion with 15.1% yield of glucose can be obtained. These results are much higher than those obtained over hierarchical H-USY zeolite, indicating that both the acidity and the pore structure determine the activity of zeolite as catalyst in the hydrolysis of biomass.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Xuyong Tang,Fengxi Li,Sijun Huang,Li Xu,Lei Wang,Yi Guo
Nicotinamide-adenine dinucleotide (NADH) as biomimetic units combined with copper ion to form laccases mimics (Cu-NADH). Cu-NADH has the enhanced activity of copper center to mediate aryl C–H amination using air as green oxidants. It could successfully catalyze oxidative coupling between different aromatic compounds and 4-phenylurazole (yield: 72 ∼ 91 %). Recycling catalytic ability (up to 6 times) showed its excellent stability. The Cu-NADH nanozyme was certificated to catalyze C–H amination effectively, and highlighted that it was a proper way to design catalysts according to enzyme-like catalyzing non-natural reaction.
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ADVANCED MATERIALS
·
2023
·Vol. 35
·期 20
·2210828
·
IF 29.4
Nan Wei,Liangcheng He,Changwei Wu,Dabiao Lu,Ruohan Li,Haiwen Shi,Haihui Lan,Yao Wen,Jun He,Youwen Long,Xiao Wang,Mengqi Zeng,Lei Fu
2D room-temperature magnetic materials are of great importance in future spintronic devices while only very few are reported. Herein, a plasma-enhanced chemical vapor deposition approach is exploited to construct the 2D room-temperature magnetic MnGa 4 -H single crystal with a thickness down to 2.2 nm. The employment of H 2 plasma makes hydrogen atoms can be easily inserted into the MnGa 4 lattice to modulate the atomic distance and charge state, thereby ferrimagnetism can be achieved without destroying the structural configuration. The as-obtained 2D MnGa 4 -H crystal is high-quality, air-stable, and thermo-stable, demonstrating robust and stable room-temperature magnetism with a high Curie temperature above 620 K. This work enriches the 2D room-temperature magnetic family and opens up the possibility for the development of spintronic devices based on 2D magnetic alloys.
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Vietnam Journal of Chemistry
·
2023
·Vol. 61
·期 2
·204-209
·
IF 0.9
Nguyen Van Vinh Ha,Nguyen Thi Thu Ha,Ong Ngoc Khanh,Dinh Truc Phuong,Ho Thanh Nhat,Nguyen Thanh Tung
Herein we reported a method for copper pivalate mediated, directed functionalization of ortho C−H bonds in (2-methylthio)aniline benzamides. Diaryl disulfides were used for thiolation, while successful phenoxylation was obtained with phenol as the coupling agent. Our report marks a rare example for flexible transformation of benzamide C(sp 2 )−H bonds into the corresponding unsymmetrical diaryl ethers and thioethers.
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JOURNAL OF ORGANIC CHEMISTRY
·
2022
·
IF 4.198
Shihai Lv,Ya-Nan Tian,Yanyan Yang,Chaoying Wen,Shiqing Li
An efficient one-pot synthesis of 1,1′-biisoquinolines by a three-component reaction of commercially available raw materials (benzils, NH4OAc, and alkynes) is disclosed. This complicated reaction involves in situ diimine formation via benzil-NH4OAc condensation, Rh(III)-catalyzed 2-fold imine-directed C–H activation, and annulation with alkynes. Both symmetric and unsymmetric 1,1′-biisoquinolines could be assembled in moderate to high yields. The reaction mechanism is supported through ESI-MS, in which Cp*ClRh+, Cp*(OAc)Rh+, Cp*(OPiv)Rh+, and two rhodacycle intermediates are successfully detected to explain the evolution of rhodium species.
研究领域:
有机化学
·
合成化学
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 13.2
Lu Zheng,Saisai Ju,Xiong Li,Yongde Ma,Hongwei Zhang,Zhenping Cai,Yanning Cao,Kuan Huang,Lilong Jiang
Efficient capture of residual NH₃ from Haber-Bosch recycling gas is essential to improve process efficiency and reduce environmental impact. In this study, a series of sulfonated porous organic polymers (PTO-1S, PTT-1S, PTF-1S) were fabricated by a post-sulfonation strategy using phenolic hydroxyl-containing precursors to capture NH 3 . Comprehensive characterizations of the sulfonated derivatives demonstrated not only the successful grafting of –SO₃H groups, but more importantly, a cooperative effect with the native phenolic –OH groups. The optimized PTO-1S achieves an outstanding NH₃ capacity of 11.52 mmol/g (at 298.2 K and 1 bar), with particularly impressive performance at low pressures (5.56 mmol/g at 313.2 K and 0.03 bar), surpassing most reported adsorbents. Mechanistic studies revealed that this cooperation creates an optimal balance of strong chemisorption (–SO₃H) and reversible hydrogen bonding (–OH), which is identified as the origin of the high capacity and exceptional cycling stability (< 1% capacity loss/cycle). Besides, the sulfonated samples maintain excellent selectivity under simulated industrial conditions (NH₃/N₂/H₂ mixtures) and a rapid adsorption rate (90% saturation within 2 min), demonstrating their potential for practical NH₃ recovery applications.
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Journal of Energy Storage
·
2024
·
IF 8.9
Qian Xie,Zhengxin Cai,Zhi Zhang,Yongjun Li,Xinyu Zhang,Jianmin Wang,Jiajia Cai
Deliberate engineering of the excellent skeleton to support the MnO 2 can facilitate electron transfer and charge distribution, contributing to high-energy/power supercapacitance. Herein, an ambient and cost-effective hydrogen-doped method is innovatively employed to prepare H-TiO 2 nanotube arrays (H-TNTAs), where the MnO 2 grows further in situ. After hydrogenation, the capacitance increases by 40-fold, attributing to the improved conductivity. The H-TNTAs supported MnO 2 provides good pseudocapacitive performance, with a specific capacitance of 430.1 F/g at a discharging current of 300 μAcm −2 . The H-TNTAs@MnO 2 coupled active carbon (AC) in 0.5 M Na 2 SO 4 electrolyte is fabricated as the aqueous asymmetric supercapacitor (ASC). The ASC device displays a high energy density of 43.9 Wh kg −1 at a power density of 550 W kg −1 , with an output voltage of 2.2 V and a superior capacitance stability of 86.7 % (over 5000 cycles). The idea for designing the hydrogenated transition metal oxides can be extended to other high-performance metal oxide electrodes for energy storage devices.
研究领域:
材料科学
·
能源存储
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Cell Communication and Signaling
·
2026
·
IF 11.6
Diao Jiayong,He Qixuan,Liu Quanzhen,Liu Yuxuan,Chen Simiao,Zhang Yuzhe,Gui Houda,Chen Jingyi,wu Dongni,Pang Xinyu,Zhang Qingyue,Wang Ya-nan,Zhang Dongjiao
Background Mitochondria, as crucial organelles in eukaryotic cells, are deeply involved in cellular energy metabolism and biogenesis. Currently, mitochondria have been found to transfer between cells and regulate a range of cellular functions and research has found that mitochondrial transfer has been shown to play an important role in regulating bone homeostasis. Methods Laser confocal imaging was used to confirm the occurrence of mitochondrial transfer between cells. JC-1 staining explains the state of free mitochondria in receptor cells. In order to reveal the relationship between the state and function of free mitochondria, osteogenic induction, Western blotting, flow cytometry, and in vivo experiments were conducted. RNA seq is used to analyze changes in cells. Different inhibitors were used to verify the specific mechanism of action of free mitochondrial transfer. Results Free mitochondrial transfer can improve the function of receptor cells through lysosomal pathway. Free mitochondria are degraded by cathepsin H (Ctsh) in lysosomes and release a large amount of cysteine after entering the receptor cells. In this process, the existence of membrane potential of free mitochondria is not critical. Cysteine, as the most important raw material for glutathione synthesis, can enhance the number and function of mitochondria in receptor cells. Conclusion Our study demonstrates that free mitochondrial transfer promotes bone regeneration by increasing cysteine supply, and provides innovative insights for understanding mitochondrial transfer.
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Materials Horizons
·
2025
·
IF 10.7
Jian-Hui Zheng,Chang-Long Tan,Ming-Yu Qi,Zi-Rong Tang,Yi-Jun Xu
Harnessing the power of photoredox catalysis for the selective C(sp3)−H activation and oxidation of alkyl aromatics represents a cutting-edge approach to transforming petroleum-derived feedstocks into value-added C(sp3)−C(sp3) coupled chemicals. Herein, we delve into the photocatalytic process that involves the selective dehydrocoupling of ethylbenzene (EB) to access 2,3-diphenylbutane (DPB) alongside H2, employing three sulfur source-varied ZnIn2S4 (denoted as ZIS-x) catalysts. ZIS-TAA, with thioacetamide (TAA) as sulfur source, exhibits exceptional photocatalytic efficiency for DPB and H2 production. The results show the deficiency of charge carrier recombination centers in defect-poor ZIS-TAA is conducive to the separation of photogenerated charge. Additionally, the larger specific surface area and more surface functional groups provide abundant sites for reactant adsorption and activation, facilitating redox process aided by an ideal band-edge structure. This work illustrates a simple and cost-effective paradigm for designing semiconductor-based photocatalysts with tailored surface properties to enhance the efficiency of target cooperative photoredox reaction.
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JOURNAL OF ORGANIC CHEMISTRY
·
2024
·
IF 3.3
Hui Xu,Zhi-Jiang Jiang,Yun Jia,Yuhang Su,Jian-Fei Bai,Zhanghua Gao,Jia Chen,Kun Gao
Aromatic sulfones are the prevailing scaffolds in pharmaceutical and material sciences. However, compared to their widespread application, the selective deuterium labeling of these structures is restricted due to their electron-deficient properties. This study presents two comprehensive strategies for the deuteration of aromatic sulfones. The base-promoted deuteration uses DMSO-d6 as the deuterium source, resulting in a rapid H/D exchange within 2 h. Meanwhile, a silver-catalyzed protocol offers a much milder option by using economical D2O to furnish the labeled sulfones.
研究领域:
药物化学
·
材料科学
·
有机合成
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NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
·
2016
·
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
·
半导体物理
·
光电子学
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Materials Horizons
·
2026
·
IF 11.4
Jiayu Wu,Pan Jiang,Xingxing Yang,Changcheng Bai,Ziyue Miao,Yixian Wang,Hang Zhang,Xiaolong Wang
Natural anisotropic tissues, such as tendons and cartilage, achieve remarkable mechanical properties and various biofunctions through oriented hierarchical structures. Inspired by organisms, we developed a synergistic molecular and structural engineering technique based on thermodynamically reversible reconfiguration of hydrogen bonds to achieve highperformance anisotropic supramolecular hydrogels by quenching pre-stretched polymer networks. Inherent multiple hydrogen bonds gradually dissociate under high-temperature processing to allow the well alignments of polymer chains by uniaxial pre-stretching. The oriented polymer chains are then fixed on-site by rapid quenching-mediated hydrogen bond reconstruction at low temperature (e.g., ice bath). This process merely relies on the inherent hydrogen bonds of polymer chains instead of traditional salting-out, metal ionic coordination and solvent effects. The optimal anisotropic hydrogel shows tensile strength of 19.4 ± 0.7 MPa, and toughness of 53.8 ± 5.2 MJ/m³ along to the pre-stretching direction, which are 2.6 and 1.7 times higher than that of unquenched isotropic hydrogels. This general strategy is applicable to different strong hydrogen bonding supramolecular hydrogel systems. Furthermore, we also fabricate anisotropic hydrogel fibers as damping materials. The general approach to prepare anisotropic supramolecular hydrogels promises great potential for various engineering applications, such as protective and cushioning materials, flexible optical and electronics, and mechanofunctional scaffolds.
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