INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Cong Wang,Gang Li,Zheng Huang,Anfeng Peng
The cumbersome air isolation process is one of the main constraints in the development of linear α-olefins prepared by ethylene oligomerization. An effective way to solve this problem is to eliminate the use of an alkyl-aluminum cocatalyst. Herein, two forms of Versailles/Santa Barbara-5 (VSB-5) (VSB-5-H3PO4 and VSB-5-NaH2PO2) are prepared and used as heterogeneous catalysts in ethylene oligomerization in the presence of LiAlH4 as a cocatalyst. Compared to other Ni-MOFs and Ni silica–aluminate catalysts, VSB-5s maintain a wider distribution of Linear α-olefin (LAO) products at relatively high activity. In the reuse test of the catalyst, the Al species from LiAlH4 cover the surface of the catalyst and decrease its activity, which could be removed by acid treatment. In situ IR studies show that active centers for ethylene oligomerization may form in VSB-5 assisted by LiAlH4. In addition, a Cossee–Arlman-type mechanism is proposed.
研究领域:
化学工程
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Energy Advances
·
2024
·Vol. 3
·期 7
·1571-1580
·
IF 3.2
Zhaocai Jiao,Mingzu Liu,Ningbo Yang,Fengli Yu,Congxia Xie,Shitao Yu,Bing Yuan
α-Pinene and isobutene/isobutane can undergo hybrid alkylation under acid catalysis, resulting in C14 and C20 product fractions with favorable bio-based high-energy-density fuel properties after hydrogenation. In this study, the catalytic performance of zeolite molecular sieves, such as Hβ, HY, HZSM-5, HZSM-35, HSAPO-11, was investigated for the alkylation of α-pinene and Isobut-5 (a mixture of isobutene/isobutane with a mass ratio of 1 : 5) given the acidic sites and specific pore structures with shape-selective abilities of zeolite catalysts. Various characterization techniques, including temperature-programmed desorption of ammonia (NH3-TPD), Fourier transform infrared spectroscopy with pyridine adsorption (Py-IR), N2 adsorption/desorption, X-ray fluorescence spectrum (XRF), and particle size analysis, were conducted to analyze the acidic properties, pore characteristics, silica–aluminum ratio, and grain size of the zeolites, and their influence on the alkylation of α-pinene and Isobut-5. Moreover, the recycling performance of the favorite Hβ-25n catalyst and an effective regeneration method were investigated using temperature-programmed oxidation (TPO) analysis. This study provides essential research data for the preparation of α-pinene-based high-energy-density fuels.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
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.
研究领域:
食品科学
·
生物化学
·
药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Chaozhong Wu,Lingjiao Zhan,Haotian Liu,Juan Wang,Wensheng Liu,Shuwei Yao,Yunzhu Ma
Understanding the mechanism of the oriented growth in multi-component alumina-based fibers and inhibiting its progression is crucial for enhancing their thermal stability. In this study, a novel diphasic fiber composed of lamellar α-Al 2 O 3 and mosaic-like mullite grains was prepared. We discussed the oriented growth behavior of lamellar α-Al 2 O 3 grains and the diffusion phenomenon of the Al element in SiO 2 substrate under the combined addition of iron sol and La 2 O 3 , proposing a new mechanism for oriented growth in diphasic fibers. The diffusion of the Si element to the tips of alumina grains contributed to a significant increase in the mobility of non-basal planes, resulting in (0001) surface growth of α-Al 2 O 3 grains. Furthermore, the La segregation at grain boundaries significantly impeded the oriented growth of α-Al 2 O 3 grains, which was critical for improving the thermal stability of multiphase alumina-based fibers.
研究领域:
材料科学
·
陶瓷学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Yue Lu,Jingnan Zhao,Guofeng Zhao,Peiyu Yi,Liyuan Duan,Huinan Sun,Qilei Liu,Qingwei Meng
Sulfur quantum dots, a new type of non-metallic quantum dots, have gained widespread attention as a promising alternative material. In this work, we synthesized aqueous sulfur quantum dots modified with α -cyclodextrin (CD-S dots) by hydrothermal method. Under visible light irradiation, CD-S dots could promote the dehydrogenative cross-coupling reaction of alcohols and amines to produce imine products. We demonstrated the host-guest interaction between the ligand of CD-S dots and benzyl alcohol through experiments such as nuclear magnetic resonance (NMR) spectroscopy. Consequently, benzyl alcohol could easily approach the surface of CD-S dots without being affected by the ligand, and then it could be oxidized by holes. It was suggested that CD-S dots reduced the barriers of carrier transfer through host-guest interactions with benzyl alcohol, and improved the selectivity and efficiency of the reaction. Our work provided ideas for the application of emerging sulfur quantum dots in selective organic synthesis. Based on the rich tunability of quantum dot materials, various efficient and eco-friendly catalytic systems are expected to be developed.
研究领域:
材料科学
·
有机化学
·
光催化技术
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Sheng-Ping Guo,Ze Ma,Jia-Chuang Li,Huai-Guo Xue
α -LiFeO 2 and its nanocomposite with porous carbon ( α- LiFeO 2 / PC) is prepared by a simple one-step solid-state method. They are characterized by powder X-ray diffraction, scanning electron microscope, transmission electron microscope, thermogravimetry , differential scanning calorimetry , X-ray photoelectron spectroscopy, Raman spectrum, and BET surface area analysis techniques. When composited with PC, α- LiFeO 2 particles with smaller sizes locate on the surface or insert in the pores of PC. α- LiFeO 2 /PC can deliver the first discharge capacity of 1830 mAh/g, and 792 mAh/g can be maintained after 120 cycles at 0.1 C. Its capacity can reach to 570 mAh/g after 120 cycles even at 1C. The facile preparation method and nice electrochemical data, together with cheap and eco-friendly iron sources, make α- LiFeO 2 /PC a promising anode material for lithium-ion batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 19
·194001
·
IF 3.551
Bo Wang,Xin Huang,Xiao-Nan Zhou,Qiang Zhi,Liu-Cheng Hao,Zi-Xuan Li,Shan Zhao,Bao-Qiang Hou,Jian-Feng Yang,Kozo Ishizaki
One-dimensional Si3N4 nanostructures are desirable for constructing nanoscale electric and optoelectronic devices due to their peculiar morphologies. Herein, a facile and environmentally friendly catalyst-free method is proposed to synthesize ultra-long single crystal α-Si3N4 nanobelts via carbothermal nitridation of carbon nanotubes at 1750 °C. The obtained α-Si3N4 nanobelts with a flat surface (thickness of ∼150 nm, length of several millimeters) exhibited an extremely high aspect ratio, perfect crystal structure, and high specific surface area of 7.34–10.09 m2 g−1. In addition, the width was increased from approximately 80 nm to 8 μm by increasing the holding time from 1 to 3 h. The nanobelt formation was governed by the vapor–solid (VS) reaction between SiO vapor, N2 and carbon nanotubes, and the vapor–vapor reaction between SiO, CO and N2. The former was responsible for the initial nucleation and successive base-growth of α-Si3N4 nanotubes. The latter additionally contributed to the nanorod and subsequent proto-nanobelt formation and to the growth of the nanobelts. During high-temperature annealing at 1750 °C, the original Si3N4 nanotubes gradually transformed into nanorods, and, finally, nanobelts with stable shapes as a result of surface energy minimization.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 9
·1422
·
IF 5.719
Zihan Guo,Dong Wang,Zhiwei Wang,Yanfang Gao,Jinrong Liu
Replacing the commercial graphite anode in Li-ion batteries with pseudocapacitor materials is an effective way to obtain high-performance energy storage devices. α-MoO3is an attractive pseudocapacitor electrode material due to its theoretical capacity of 1117 mAh g−1. Nevertheless, its low conductivity greatly limits its electrochemical performance. MXene is often used as a 2D conductive substrate and flexible framework for the development of a non-binder electrode because of its unparalleled electronic conductivity and excellent mechanical flexibility. Herein, a free-standing α-MoO3/MXene composite anode with a high specific capacity and an outstanding rate capability was prepared using a green and simple method. The resultant α-MoO3/MXene composite electrode combines the advantages of each of the two components and possesses improved Li+diffusion kinetics. In particular, this α-MoO3/MXene free-standing electrode exhibited a high Li+storage capacity (1008 mAh g−1at 0.1 A g−1) and an outstanding rate capability (172 mAh g−1at 10 A g−1), as well as a much extended cycling stability (500 cycles at 0.5 A g−1). Furthermore, a full cell was fabricated using commercial LiFePO4as the cathode, which displayed a high Li+storage capacity of 160 mAh g−1with an outstanding rate performance (48 mAh g−1at 1 A g−1). We believe that our research reveals new possibilities for the development of an advanced free-standing electrode from pseudocapacitive materials for high-performance Li-ion storage.Keywords:free-standing electrode;α-MoO3/MXene composite anode;high capacity;electrochemical energy storage
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Bin-Bin Zhang,Fangbao Wang,Xin Liu,Bao Xiao,Meng Xu,Song-Tao Dong,Yadong Xu,Paul Sellin,Wanqi Jie
Halide perovskites have been considered as nuclear radiation detection materials due to their high mobility, long carrier lifetime, and high absorption coefficient. However, it has been reported that the ion migration increases the dark current of halide perovskite detectors and hinders the stable response to high energy photons or particles. In this work, we report the utilization of the “voltage cycling” technique to obtain the stable α-particle spectra in a CsPbBr2.4Cl0.6 device. Also, by measuring the time-dependent stability and the effect of electric field strength, we can gain insight into the phenomona causing instability in these devices. Accordingly, the influence of ion migration on the charge transport properties and energy spectra in CsPbBr2.4Cl0.6 detectors was also revealed. Our investigation demonstrates the strong correlation between ion migration processes and stable energy spectra in halide perovskite materials.
研究领域:
材料科学
·
核物理
·
辐射探测
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Xiuzhen Qiu,Weimao Chen,Yiling Luo,Yulin Wang,Yanlian Wang,Huishi Guo
α-amanitin is the most toxic amanita in mushrooms with lethal dose to humans around 0.1 mg. Kg −1 . Hence, early identification of the poison would improve survival rates and prevent lethal poisoning cases. In this study, molecularly imprinted photonic crystal (MIPC) sensor was prepared by combining molecular imprinting with photonic crystal templates and tested towards the detection of α-amanitin. In this process, synthesized moiety of α–amanitin was utilized as template, dispersed SiO 2 colloidal photonic crystal as carrier, methacrylic acid (MAA) as functional monomer , and ethylene glycol dimethacrylate (EDGMA) as crosslinker. The adsorption behavior of MIPC towards α-amanitin in ethanol solution showed shifts in diffraction peaks of MIPC upon binding with α-amanitin molecules. The reflection peak wavelength varied linearly with α-amanitin concentration according to the correlation formula: λ = 15.417 c +489.17 (R 2 = 0.9985). The recognition process was accompanied by gradual color change in MIPC film. The prepared MIPC sensor possessed wide linear range (10 −9 –10 −3 mg L −1 ), change in visual color, low detection limit (10 −10 mg L −1 ), short response time (2 min), and good reusability. The MIPC film was then tested towards the detection of α-amanitin in real biological samples (mushroom, urine, and serum) and showed reasonable shift in diffraction peaks and color change upon soaking in solutions spiked with α-amanitin at 10 −6 mg L −1 and 10 −3 mg L −1 , suggesting the suitability of the film for the rapid identification of α-amanitin in complex sample matrices. Overall, the proposed sensor looks promising for the rapid identification of α-amanitin in clinical analysis and food poisoning.
研究领域:
生物化学
·
毒理学
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOMACROMOLECULES
·
2015
·
IF 5.75
Hao Yang,Chuan Zhang,Chang Li,Yong Liu,Yingli An,Rujiang Ma,Linqi Shi
Polymeric nanoparticles with glucose-responsiveness are of great interest in developing a self-regulated drug delivery system. In this work, glucose-responsive polymer vesicles were fabricated based on the complexation between a glucosamine (GA)-containing block copolymer PEG45-b-P(Asp-co-AspGA) and a phenylboronic acid (PBA)-containing block copolymer PEG114-b-P(Asp-co-AspPBA) with α-CD/PEG45 inclusion complex as the sacrificial template. The obtained polymer vesicles composed of cross-linked P(Asp-co-AspGA)/P(Asp-co-AspPBA) layer as wall and PEG chains as both inner and outer coronas. The vesicular morphology was observed by transmission electron microscopy (TEM), and the glucose-responsiveness was investigated by monitoring the variations of hydrodynamic diameter (Dh) and light scattering intensity (LSI) in the polymer vesicle solution with glucose using dynamic light scattering (DLS). Vancomycin as a model drug was encapsulated in the polymer vesicles and sugar-triggered drug release was carried out. This kind of polymer vesicle may be a promising candidate for glucose-responsive drug delivery.
研究领域:
生物材料
·
药剂学
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2024
·Vol. 25
·期 23
·12844
·
IF 4.9
Zhining Gao,Haoyang Dai,Qinqin Zhang,Fan Yang,Chenxi Bu,Suiqing Chen
Acute liver injury (ALI) is an injury to liver tissue caused by viruses, drugs, alcohol, and oxygen deprivation, and is one of the most common and serious clinical disorders. Hydroxytyrosol (HT) is a naturally occurring polyphenolic compound isolated from forsythia and has excellent anti-inflammatory properties. However, the effect and mechanisms of HT in ALI remain unclear. We used the LPS/D-GalN induced experimental ALI mouse model and AML12 cells to reveal the efficacy and potential mechanisms of HT in ALI, and HE staining was used for the evaluation of pathologies. A biochemical assay was used to detect changes in liver function, RNA-seq was conducted to reveal the underlying mechanisms of HT for ALI, and WB, RT-qPCR, and IF were used to assess the effects of HT action. Furthermore, an in vitro ALI model against HT in AML12 cells induced by LPS/D-GalN was used to assess the HT protection mechanism. HT significant alleviated LPS/D-GalN-induced ALI in the mice by suppressing inflammatory. In terms of RNA-seq, HT improved the TNF, ECM-receptor interaction, and PI3K/AKT signaling pathway, and it downregulated the mRNA levels of VCAM-1, CXCL5, TNF-α and IL-6 in the liver. Mechanically, HT alleviated LPS/D-GalN in the mice by targeting TNF-α, thereby inhibiting the TNF-α/PI3K/AKT signaling pathway.
研究领域:
药理学
·
肝病学
·
分子生物学
·
免疫学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）