Journal of Physical Chemistry C
·
2014
·
IF 4.835
Ming Wen,Bo Zhou,Hao Fang,Qingsheng Wu,Shipei Chen
An approach has been explored to highly improve the catalytic activity and stability for methanol oxidation reaction (MOR) by using dominant α-(NiCu)3Pd phase-structural NiCuPd nanoparticles (NPs) as anode catalysts. The NiCuPd alloy NPs are monodispersed with the diameter of ∼10 nm and have been prepared by the reduction of Pd(acac)2, Ni(acac)2, and Cu(acac)2 following alloying growth process. In the Ni–Cu–Pd alloy system, Ni atoms fused in Cu3Pd phase to form α-(NiCu)3Pd phase together with NiCuPd solid solution phase. As Ni concentration gradually enriched, the crystallinity of α-(NiCu)3Pd became higher, while its percentage decreased by one degree. Owing to the synergistic effect between components and facet atom arrangement, the catalytic activity and stability of NiCuPd NPs can be adjusted toward the MOR in alkaline media. The maximized crystallinity of α-(NiCu)3Pd results in the largest catalytic activity. Compared with commercial Pd/C with (111) facets, α-(NiCu)3Pd phase with (117) facets afforded a more open-atom arrangement surface and exhibited the remarkable catalytic activity and stability. Containing maximized crystallinity of α-(NiCu)3Pd, Ni63Cu12Pd25 NP-modified electrode, afforded the highest catalytic activity (333 mA·mg–1) toward the MOR, which is about 2.5 times higher than that of the commercial Pd/C-modified one (145 mA·mg–1). Combining the advantages of high electrochemical activity, stability, and economical effectiveness, the novel phase of α-(NiCu)3Pd has great potential as an anode catalyst for methanol fuel cells.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Weida Shi,Zhihao Jin,Juanjuan Wen,Xianfu Chen,Kaiyun Fu,Xiaowei Da,Minghui Qiu,Yiqun Fan
The development of tight ceramic ultrafiltration membranes for water purification facilitates is challenging because of high fabrication costs and low permeate flux . In this study, a low-energy rapid thermal process (RTP) was comprehensively investigated for fabricating of high-precision, permeable α-alumina tight ultrafiltration membranes. Compared to the conventional thermal process (CTP), RTP offers an ultra-fast heating rate and shorter holding time, effectively mitigating grain growth and pore aggregation. Moreover, the decomposition of organic matter is delayed during RTP, providing a lower interfacial energy that enables direct formation of α-alumina at a low temperature of 750 °C. During a secondary subsequent RTP, the residual phase is fully converted to α-alumina by the in-situ seeding effect. By utilizing RTP, we successfully prepared α-alumina ultrafiltration membranes within 30 min by calcination , with an average pore size of approximately 6 nm, a narrow pore distribution coefficient of 1.12, and high permeance of 219 L −1 ·m −2 ·h −1 ·bar −1 .
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高影响因子
MOLECULES
·
2024
·Vol. 29
·期 23
·5622
·
IF 4.2
Shengxue Zhang,Wangchuan Xiao,Jingjing Wu,Fanhong Wu,Houjin Huang,Xiaoyu Ma,Yafei Shi,Chao Liu
A novel and efficient 1,2-oxidative trifluoromethylation of olefins employing Ag(O 2 CCF 2 SO 2 F) as a trifluoromethyl source is described with O 2 as the oxidant, which provides access to a variety of valuable α-trifluoromethyl-substituted ketones. The broad substrate scope, feasibility of large-scale operation, and derivatization reactions of α-trifluoromethyl ketones demonstrate the promising utility of this protocol.
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PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Haoyu Ma,Xiaoling Niu,Wenlong Qu,Yongliang Liu,Zhen Feng,Shengbo Zhu
Aggregation induced emission luminogens (AIEgens) as one of the optimal alternatives for designing stimuli-responsive fluorophores for real-life applications have sparked much current interest in smart materials design. Herein, the “Star molecules” in AIEgens of α-cyanostilbene and Tetraphenylethylene (TPE) derivatives were constructed into one molecular, namely DC-TPE-tBu and DC-TPE-CN. Both compounds exhibited significant AIE properties. Moreover, the two compounds could change their luminescent colors and intensities under the stimulation of external mechanical force and UV light, showing excellent mechanochromic luminescent (MCL) and remarkable photo-responsive behaviors, respectively. The stimuli responsive mechanisms were investigated by powder X-Ray diffractometer (PXRD) spectra and density functional theory calculations (DFT). The MLC behaviors were associated with the crystalline-to-amorphous transitions after mechanical grinding. These remarkable features make them suitable for the application of mechano/photo-sensors. The studies provide a useful strategy for developing AIE-active functional materials.
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高影响因子
EUROPEAN POLYMER JOURNAL
·
2019
·
IF 3.621
Xiaohui Fu,Zheng Li,Min Lin,Jing Sun,Zhibo Li
A series of N -alkylated glycine and l -alanine bearing oligoethylene glycol (OEG) and benzyl side chains, i.e., N -(4-oligoethylene glycol)benzyl glycine and N -(4-oligoethylene glycol)benzyl alanine (NMe(OEt) x OBnG and NMe(OEt) x OBnA, x = 1–3), have been readily synthesized via schiff base and reductive amination reactions. The successful ring opening polymerization (ROP) of N -substituted glycine N -carboxyanhydrides (NCA) results in three types of peptoid oligomers (PNMe(OEt) x OBnG, x = 1–3). Depending on the length of OEG side chains, PNMe(OEt) x OBnG show different solubility in water. Particularly, the as-prepared oligomers containing three ethylene glycol units (PNMe(OEt) 3 OBnG) display interesting thermoresponsive aggregation behaviors in water. DSC results reveal that all the oligomers show crystalline behaviors with melting temperatures decreasing as the OEG side chain length is increased. Both live-dead and MTT assays indicate low cytotoxicity of PNMe(OEt) 2 OBnG and PNMe(OEt) 3 OBnG toward HeLa cells, comparable to benchmark PEG. Concerning thermoresponsive and crystalline properties, the as-prepared peptoid oligomers are potentially promising building blocks for stimuli-responsive bioinspired materials and hierarchical self-assembly.
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高影响因子
BioDesign Research
·
2024
·
IF 0
Xinyue Gui,Fei Li,Xinyu Cui,Ranran Wu,Dingyu Liu,Chunling Ma,Lijuan Ma,Huifeng Jiang,Chun You,Zhiguang Zhu
Terpenoids of substantial industrial interest are mainly obtained through direct extraction from plant sources. Recently, microbial cell factories or in vitro enzymatic biosystems have emerged as promising alternatives for terpenoid production. Here, we report a route for the synthesis of α-farnesene based on an in vitro enzyme cascade reaction using methanol as an inexpensive and renewable C1 substrate. Thirteen biocatalytic reactions divided into 2 modules were optimized and coupled to achieve methanol-to-α-farnesene conversion via integration with natural thylakoid membranes as a green energy engine. This in vitro enzymatic biosystem driven by light enabled the production of 1.43 and 2.40 mg liter−1 α-farnesene using methanol and the intermediate glycolaldehyde as substrates, respectively. This work could provide a promising strategy for developing light-powered in vitro biosynthetic platforms to produce more natural compounds synthesized from C1 substrates.
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AUSTRALIAN JOURNAL OF CHEMISTRY
·
2023
·Vol. 76
·期 11
·774-784
·
IF 1.1
Fan-Ming Yang,Xi-Da Li
Rod-like porous α-Fe2O3 was synthesized by static hydrothermal treatment at 160°C and used as a symmetric supercapacitor. The phase information, structure, morphology, valence state and composition of the prepared sample were characterized using X-ray diffraction, infrared spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy and N2 adsorption–desorption. The results show that the prepared α-Fe2O3 is a rod-like porous material dominated by mesopores. Moreover, the α-Fe2O3 is a hexagonal single crystal with [FeO6] octahedrons and the interplanar crystal spacings are large enough for electrolyte ion diffusion. In both KOH and Na2SO4 electrolytes, the α-Fe2O3 sample displays good pseudocapacitance performance. However, the specific discharge capacity and energy density in KOH are larger than in Na2SO4. In 1molL–1 of KOH, remarkable capacities of 139 and 35.5Fg–1 are obtained and an energy density of 3.91 and 1.01Whkg–1 is achieved at 1 and 20Ag–1 respectively. After 10000 cycles, 87.7% of the specific capacitance is still retained at 1Ag–1. The good capacitance properties may attributed to the rod-like porous structure and large interplanar spacing, which provide good ion insertion–exit paths, enough oxidation–reduction active sites and a fast ion transfer velocity.
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高影响因子
RSC Advances
·
2025
·Vol. 15
·期 8
·5801-5807
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IF 4.6
Zeen Zhang,Tianjiao Li,Yong Dong,Yangcheng Lu
This study focuses on ethylene homopolymerization catalyzed by α-diimine catalysts within a designed microfluidic system. Distinct from conventional batch reactors, this microfluidic configuration effectively eradicates the reaction environment heterogeneity, thereby guaranteeing homogeneous reaction conditions and decoupling the mass transfer from the reaction process. This unique setup enables precise modulation of ethylene concentration, facilitating the isolation of variables to scrutinize the effects of temperature and pressure on the polymerization. By varying residence times, it's revealed that the reaction rate is ethylene concentration-independent. Variable separation studies between concentration and temperature show an inverse relationship between temperature and branching degree (BD), contrasting traditional batch reactions due to ethylene concentration changes. Pressure studies indicate that higher pressure leads to lower BD. Different product structures' steric hindrances influence the reaction rate; greater hindrance slows it down. These novel findings suggest microreactors offer new perspectives on late transition metal-catalyzed ethylene homopolymerization, potentially enabling breakthroughs in mass production.
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DOI
PubMed
高影响因子
Frontiers in Nutrition
·
2025
·
IF 5.1
Xiaojie Zhang,Lan Yang,Haifei Lian,Zixuan Xu,Zichen Yun,Xiaohui Xu,Shixiong Liu,Qifei Luo,Majigsuren Zolzaya,Dacheng Liu
Background: Composite yeast culture (CYC) serves as an important functional feed additive. The content of its active ingredient, α-mannan, directly affects product quality and efficacy. However, due to the complex matrix of CYC, establishing a highly specific and accurate quantitative method for α-mannan remains a challenge.Methods: This study aimes to establish an analytical method based on enzymatic hydrolysis combined with high-performance liquid chromatography equipped with an ultraviolet detector (HPLC-UV) for the quantification of α-mannan in CYC. The method involved the specific enzymatic hydrolysis of α-mannan in the sample using α-mannosidase, followed by the release of mannose, which was then derivatized with 1-phenyl-3-methyl-5-pyrazolone (PMP) and analyzed by HPLC-UV. The actual content of α-mannan was calculated using a formula.Results: Method validation results showed that mannose exhibited good linearity within the concentration range of 0.5–400 μg/mL, with a correlation coefficient of 0.99998. The limit of detection (LOD) and limit of quantification (LOQ) were 0.063 mg/L and 0.208 mg/L, respectively. The average recovery rate was 88.020%−94.204%, with a relative standard deviation (RSD) ranging from 0.702% to 2.259%, indicating that the method has high accuracy and good precision.Conclusion: This study successfully established an efficient and reliable HPLC-UV detection method suitable for the specific quantitative analysis of α-mannan in CYC. The method exhibited good reproducibility and operational feasibility, providing robust technical support for quality control of CYC products and related functional component research.
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PubMed
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Tao Chen,Changdong Lin,Weihang Lu,Shuo Wang,Cheng Shen,Juyuan Luo,Yulin Li
In the present study, six 7- O -glycosyl acylation of flavonoids derived from lutonarin and saponarin were obtained from barley seedlings by medium-pressure LC, high-speed counter-current chromatography and preparative HPLC guided by UPLC-QTOF-MS/MS. Their inhibitory effects on α-glucosidase were investigated. Structure–activity relationship showed 7- O -glycosyl acylation enhanced inhibitory effect on α-glucosidase with coumaroyl > feruloyl > hydroxybenzoyl > sinapoyl. The IC₅₀ values for saponarin and its four acylated products were 802.4 ± 0.48 μg/mL, 374.6 ± 0.16 μg/mL, 461.6 ± 0.27 μg/mL, 523.8 ± 0.24 μg/mL and 585.8 ± 0.42 μg/mL, respectively. Steady-state fluorescence spectroscopy revealed 7- O -glycosyl acylation enhanced the fluorescence quenching rate of α-glucosidase. Molecular docking revealed 7- O -glycosyl acylation formed more hydrogen bonds and hydrophobic interactions with α-glucosidase. Synchronous fluorescence spectroscopy showed all compounds altered the hydrophobic microenvironment surrounding the tryptophan residues in α-glucosidase. Circular dichroism spectroscopy indicated 7- O -glycosyl acylation modified the conformation and secondary structure of α-glucosidase.
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PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Fangchao Wang,Rui Liu,Hongyi Cui,Ali Ramazani,Ali Morsali,Guoying Zhang
The epoxidation of long-chain α-olefins presents a significant challenge in synthetic chemistry, particularly when employing molecular oxygen from air as the sole oxidant under additive-free conditions. In this study, we demonstrate that manganese supported on mesoporous silica (Mn/MSN) effectively catalyzes the aerobic epoxidation of long-chain α-olefins without requiring initiators or sacrificial agents. Mechanistic investigations reveal a synergistic interplay between Mn(II) and Mn(III) species, which facilitates the selective cleavage the peroxo bonds (O–O) in alkyl hydroperoxide intermediates. Strategic incorporation of iron and zirconium into the Mn/MSN framework modulates the manganese oxidation states, enriching the Mn(II)/Mn(III) ratio and achieving a remarkable space-time yield of up to 200 mol epoxide mol⁻¹ Mn h⁻¹ . Radical trapping experiments combined with high-resolution mass spectrometry corroborate the formation of allyl carbon-centered and alkoxy radical intermediates during the reaction. This work provides a feasible strategy for long-chain α-olefin aerobic epoxidation without any additives.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Lin Ma,Xiaotong Chen,Hua Kang,Zijiang Liu,Guixin Wan,Shuyi Ma,Tingting Wang,Liang Cheng,Nina Ma,Ping Ni
Recently, materials derived from metal-organic frameworks (MOFs) have garnered increasing attention owing to their exceptional gas-sensing performance. In this study, hollow ship-like α-Fe 2 O 3 with oxygen vacancy defects and thin shells were successfully synthesized via a simple calcination method using MIL-88A (Fe) as a precursor. Characterization results revealed that the α-Fe 2 O 3 exhibited a porous structure composed of nanoparticles featuring a rough surface. Notably, under the optimum operating temperature of 180 °C, the sensor based on α-Fe 2 O 3 demonstrated remarkable performance in detecting triethylamine gas (TEA), exhibiting an ultra-high response (527 at 50 ppm), rapid response/recovery times (20/8 s at 2 ppm), and excellent selectivity. These outstanding TEA-sensing properties are primarily attributed to the unique morphologic structures and suitable defects, suggesting that this research will facilitate the efficient and rapid development of high-performance gas sensors for TEA.
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