Small
·
2022
·Vol. 18
·期 46
·2204742
·
IF 15.153
Zihui Liang,Bowen Jin,Jinguo Cao,Fengxiang Chen,Jing Li,Shimin Wang,Kai Wang,Congcong Wu
Surface states are one of the crucial factors determining the phase stability of formamidinium-based perovskites. Compared with other compositions, exclusive lattice strain in FAPbI 3 perovskite generates defects at the surface more readily, making them more vulnerable at the surface and easier to trigger the phase transition from α-phase to the non-perovskite δ-phase. In order to regulate the surface quality, here, a chemi-mechanical cleavage approach is reported, i.e., tape peel-zone (PZ), implemented by attaching and peeling off the ordinary Kapton Tapes. The PZ approach can simultaneously eliminate the surface defects of perovskite and siliconize the film surface with hydrophobic silicone compounds. These two functionalities endow α-FAPbI 3 perovskite with a robust hydrophobic surface, which can sustain for 30 days under a relative humidity of 60% and withstand the high temperature up to 240 °C. The unencapsulated PZ-treated cells show 80.3% of initial performance after 90 h of continuous operation in ambient air, which is 31.4 times more stable than the pristine cell.
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NANOTECHNOLOGY
·
2022
·Vol. 33
·期 50
·505601
·
IF 3.953
Xinchao Liang,Jinqian Hao,Pengyu Zhang,Chuang Hou,Guoan Tai
Borophene has attracted extensive interests owing to its distinct structural, electronic and optical properties for promising potential applications. However, the structural instability and need of metal substrate for deposition of borophene seriously restrict the exploration of its exceptional physical and chemical properties and further hamper its extensive applications towards high-performance electronic and optoelectronic devices. Here, we reported the synthesis of high-quality freestanding α-rhombohedral borophene nanosheets by a facile probe ultrasonic approach in different organic solvents. The results show that the nanosheets have high-quality in ethanol solution and have an average lateral size of 0.54 μm and a thickness of around 1.2 nm. Photoluminescence spectra indicate that a strong quantum confinement effect occurs in the nanosheets, which caused the increase of the band gap from 1.80 eV for boron powders and 2.52 eV for the nanosheets s. A nonvolatile memory device based on the nanosheets mixed with polyvinylpyrrolidone was fabricated, which exhibited a good rewriteable nonvolatile memory behavior and good stability.
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INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Si-Qi Nie,Yun-Yue Yuan,Hui-Min Zeng,Zhan-Guo Jiang,Cai-Hong Zhan
The ability to conceptually mimic biomolecules to construct emergency-functional homospiral aggregates remains a long-standing challenge. Herein, we report artificial homohelical assembly by blending inorganic polyoxometalates (POMs) and organic cyclodextrin molecules. The chiral double-helical chains have been achieved by a left-hand arrangement of trimer–trimer. The trimer is formed by three {Mo8}@α-CD inclusive complexes as a Whittaker-style paddle wheel. During the process of assembly, chiral transfer and amplification from molecule to superstructure were observed. The enantioselective adsorption of the homohelical aggregate toward (R/S)-1,1′-binaphthyl-2,2′-diamine was further demonstrated. The interaction of {Mo8} and α-CD in solution was investigated. This work opens a wide scope for the design of a homohelix, enriching POM-based inorganic–organic materials.
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PHYTOCHEMISTRY
·
2023
·
IF 3.8
Meijia Zheng,Chenxi Zhou,Hong Liao,Qin Li,Alan Bao,Chunmei Chen,Feng He,Peng Wu,Weiguang Sun,Hucheng Zhu,Yonghui Zhang
Five pairs of undescribed enantiomeric α -pyrone derivatives (±)-adprepyrones A−E (± 1 −± 5 ), together with an unreported congener adprepyrone F ( 6 ), and 6-[( E )-3-Hydroxyprop-1-enyl]-4-methoxy-5-methyl-2-pyrone ( 7 ), recently reported as synthetic compound, were isolated from the fungus Talaromyces adpressus . Their structures with absolute configurations were elucidated by HRESIMS, 1D and 2D NMR , electronic circular dichroism calculations, and single-crystal X-ray diffraction analyses. (±)-Adprepyrone A (± 1 ) possesses an unreported carbon skeleton formed by the fusion of an α -pyrone derivative with nicotinamide . Compounds (+)- 2 , (±)- 4 , (±)- 5 , and 7 showed moderate inhibitory activity against concanavalin A (ConA)-induced T lymphocyte proliferation with IC 50 values ranging from 8.9 to 19.8 μM.
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Nanomaterials
·
2021
·Vol. 11
·期 4
·890
·
IF 5.076
Yong Li,Qifeng Kuang,Xiaoling Men,Shenggang Wang,Da Li,Chuljin Choi,Zhidong Zhang
α″-Fe16N2nanomaterials with a shape anisotropy for high coercivity performance are of interest in potential applications such as rare-earth-free permanent magnets, which are difficult to synthesize in situ anisotropic growth. Here, we develop a new and facile one-pot microemulsion method with Fe(CO)5as the iron source and tetraethylenepentamine (TEPA) as the N/C source at low synthesis temperatures to fabricate carbon-coated tetragonal α″-Fe16N2nanocones. Magnetocrystalline anisotropy energy is suggested as the driving force for the anisotropic growth of α″-Fe16N2@C nanocones because the easy magnetization direction of tetragonal α″-Fe16N2nanocrystals is along the c axis. The α″-Fe16N2@C nanocones agglomerate to form a fan-like microstructure, in which the thin ends of nanocones direct to its center, due to the magnetostatic energy. The lengths of α″-Fe16N2@C nanocones are ~200 nm and the diameters vary from ~10 nm on one end to ~40 nm on the other end. Carbon shells with a thickness of 2–3 nm protect α″-Fe16N2nanocones from oxidation in air atmosphere. The α″-Fe16N2@C nanocones synthesized at 433 K show a room-temperature saturation magnetization of 82.6 emu/g and a coercive force of 320 Oe.Keywords:α″-Fe16N2;permanent magnetic material;one-dimensional nanocones;core/shell structure;anisotropic growth;chemical solution method
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Journal of Food Measurement and Characterization
·
2021
·Vol. 15
·期 4
·3408-3418
·
IF 2.431
Xie Zhike,He Ming,Zhai Yuhan,Xin Feifei,Yu Shuyan,Yu Shaoxuan,Xiao Haifang,Song Yuanda
Abstract Inhibition of α-glucosidase is considered as an effective approach to treat type 2 diabetes. Therefore, it is of great significance to study the inhibition of this enzyme. In the present study, the inhibitory activity of oleanolic acid (OA) on α-glucosidase and their interaction mechanism were investigated. The inhibition kinetic analysis showed that OA reversibly inhibited α-glucosidase activity in a mixed-type manner with an IC 50 value of 3.04 ± 0.05 µM, and the inhibition followed a multi-phase kinetic process with a first-order reaction. The change of enthalpy and entropy indicated that the binding of OA to glucosidase was mainly driven by hydrophobic interaction and hydrogen bonding, and the binding distance was estimated at 3.51 nm. Synchronous fluorescence, circular dichroism (CD) and Fourier transform infrared spectra (FT-IR) showed that the binding of OA to α-glucosidase induced rearrangement and conformational changes of the enzymes. The molecular docking illustrated that OA entered the active center of α-glucosidase and interacted with the amino acid residues Asp-352 and ultimately inhibiting the enzyme activity. Graphic Abstract
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PROGRESS IN ORGANIC COATINGS
·
2020
·
IF 4.469
Xiaoyu Ma,Ding Cao,Xiaotong Hu,Jun Nie,Tao Wang
Novel photoinitiators (α-DKs) bearing α-dicarbonyl groups as initiating group and aromatic groups as chromophore group were synthesized and developed as visible light type I photoinitiators with high performance for radical photopolymerization of acrylate. α-DKs exhibit good absorption at 405 nm and higher initiation efficiency compared with commercial initiator camphorquinone (CQ) under LED sources. Meanwhile, α-DKs were found to efficiently photosensitize bis (4-methylphenyl) hexafluorophosphate (ION) and initiate both free radical polymerization and cationic polymerization.
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JOURNAL OF ELECTRONIC MATERIALS
·
2019
·Vol. 48
·期 7
·4653-4659
·
IF 1.676
Lei Dongling,Ma Shiyu,Lu Youcai,Liu Qingchao,Li Zhongjun
A rechargeable Li-CO 2 battery has been considered to be a promising battery system due to its high-energy density and the utilization of carbon dioxide (CO 2 ). However, the high overvoltage caused by the discharge product Li 2 CO 3 hinders the development of Li-CO 2 batteries. In this work, α-MnO 2 nanowires obtained via a redox reaction have been employed as the cathode catalyst in the Li-CO 2 battery, which can provide sufficient catalytic sites for CO 2 evolution and tune the cathode structure for the uniform distribution of Li 2 CO 3 and C on the cathode. The Li-CO 2 battery with an MnO 2 /carbon nanotube (CNT) cathode exhibits significantly reduced overpotential, and could be operated for 50 cycles with a fixed capacity of 1000 mAh g −1 and 6 cycles of full discharge–charge tests at a current density of 100 mA g −1 .
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RSC Advances
·
2018
·Vol. 8
·期 54
·31121-31128
·
IF 2.936
Feng-Xia Liang,Lin Liang,Xing-Yuan Zhao,Xiao-Wei Tong,Ji-Gang Hu,Yi Lin,Lin-Bao Luo,Yu-Cheng Wu
In this work, we reported the utilization of mesoporous α-Fe2O3 films as optical sensors for detecting organic vapors. The mesoporous α-Fe2O3 thin films, which exhibited obvious Fabry–Perot interference fringes in the reflectance spectrum, were successfully fabricated through electrochemical anodization of Fe foils. Through monitoring the optical thickness of the interference fringes, three typical organic species with different vapor pressures and polarities (hexane, acetone and isopropanol) were applied as probes to evaluate the sensitivity of the α-Fe2O3 based interferometric sensor. The experiment results showed that the as-synthesized mesoporous α-Fe2O3 interferometer displayed high reversibility and stability for the three organic vapors, and were especially sensitive to isopropanol, with a detection limit of about 65 ppmv. Moreover, the photocatalytic properties of α-Fe2O3 under visible light are beneficial for degradation of dodecane vapor residues in the nano-pores and refreshment of the sensor, demonstrating good self-cleaning properties of the α-Fe2O3-based interferometric sensor.
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FOOD RESEARCH INTERNATIONAL
·
2015
·
IF 2.818
Huizhi Xiao,Benguo Liu,Haizhen Mo,Guizhao Liang
In this work, the inhibitory effects of tannic acid on the α-glucosidase and trypsin were systematically evaluated by comparing with the clinical diabetes healer acarbose and the soybean-derived trypsin inhibitor using fluorescence spectroscopy and enzymatic kinetics methods. We showed that the anti-α-glucosidase activity of tannic acid (IC 50 = 0.44 μg/mL) was higher than that of acarbose (IC 50 > 0.60 μg/mL), while its anti-trypsin activity (IC 50 = 0.79 mg/mL) was significantly lower than that of the trypsin inhibitor from soybean (IC 50 < 0.20 mg/mL). Enzymatic kinetics measurements confirmed that the inhibitory pattern of tannic acid toward two tested enzymes was a mixed competitive and noncompetitive inhibition. Tannic acid could bind the enzymes to form new complexes, presenting a strong static fluorescence quenching. The presence of tannic acid led to the hypsochromic shift of the maximum fluorescence in trypsin, but not in α-glucosidase. The thermodynamic parameters indicated that the main driving force between tannic acid and both the enzymes was the hydrophobic interaction followed by the electrostatic interaction. Our work suggests that tannic acid is a strong anti-α-glucosidase natural inhibitor with a low inhibitory activity for trypsin, thus its roles in functional food and medicinal plants should be re-recognized.
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MOLECULES
·
2014
·Vol. 19
·期 12
·19665-19677
·
IF 2.095
Zong-Bo Xie,Da-Zhao Sun,Guo-Fang Jiang,Zhang-Gao Le
A mild and efficient method catalyzed by α-chymotrypsin was developed for the synthesis of bis(indolyl)methanes through a cascade process between indole and aromatic aldehydes. In the ethanol aqueous solution, a green medium, a wide range of aromatic aldehydes could react with indole to afford the desired products with moderate to good yields (from 68% to 95%) using a little α-chymotrypsin as catalyst.Keywords:bis(indolyl)methanes;tandem protocol;biocatalysis;promiscuity;α-chymotrypsin
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PLANTA MEDICA
·
2013
·
IF 2.348
Cui-Ting Luo,Huan-huan Zheng,Shuang-Shuang Mao,Mao-xun Yang,Cheng Luo,Heru Chen
Two new xanthones, 1,8-dihydroxy-3-methoxyxanthone 7-O-[α-L-rhamnopyranosyl(1 → 2)-β-D-glucopyranoside] (1) and 1,8- dihydroxy-3-methoxyxanthone 7-O-[α-L-rhamnopyranosyl(1 → 3)-α-L-rhamno-pyranosyl (1 → 2)-β-D-xylopyranoside] (2), together with 26 known xanthones (3–28), were isolated from the aqueous ethanol extract of the traditional Chinese herb Swertia mussotii. Their structures were elucidated via spectroscopic analyses including 2D NMR. The inhibition of α-glucosidase by the isolated xanthones was evaluated by an in vitro high-throughput screening assay. Our results indicated that 1,3,5,8-tetrahydroxyxanthone is the best inhibitor with an IC50 value of 5.33 ± 0.09 µM, while the O-glycosylated xanthones were poor α-glycosidase inhibitors.
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