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Lirong Wang,Shunzhen Feng,Tingting Lu,Lizhen Zhen,Jiwei Zhang,Lihu Liu 한국자기학회 2022 Journal of Magnetics Vol.27 No.3
Binary alloy nanowires of Fe3Co7 system are synthesized in the highly ordered porous anodic aluminum oxide (PAA) templates by AC frequency (5, 50, 120, and 200 Hz) conversion electrodeposition method. High resolution field emission transmission electron microscope (HRTEM) and Lorenz TEM (LTEM) were used to study the morphology and the magnetic domain structure of the Fe3Co7 alloy nanowires, respectively. Magnetic measurements showed that the M-H curves presented a discontinuity in a restricted magnetic field, but with high squareness (about 90 %). Quantitative local measurements of the magnetic properties of the nanowires are explored by differential phase contrast (DPC) imaging. The magnetic properties, however, were significantly affected by the AC frequency, which is correlated with the specific magnetic structure formation of Bloch line. We reported herein a detailed investigation on Fe3Co7 alloy nanowires and their magnetic properties.
Xiang Wen,Lizhen Hou,Lianwen Deng,Daitao Kuang,Heng Luo,Shiliang Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.7
CoNi magnetic nanoparticles (NPs) and hybrid architectures have attracted tremendous attention from numerous applications. In this study, a facile approach based on one-step metal-organic chemical vapor deposition (MOCVD) was developed to fabricate CoNi/C core/shell NPs with an extremely small core size of ~3.7 nm and an ultrathin shell thickness of 1–3 nm. Only 10 wt.% CoNi/C core/shell NP-filled composites with thickness of 1.6 mm exhibit an optimal reflection loss value of -25.7 dB and an absorbing bandwidth value up to 6.2 GHz. The extremely small core/shell NPs are demonstrated to have enhanced electromagnetic parameters (i.e., complex permittivity and permeability), reflection loss and broadened effective absorption bandwidth, as compared to the relatively larger NPs. The superior microwave absorbing performance should be attributed to the increased specific area with enriched interfacial polarization. The as-synthesized extremely small CoNi/C core/shell NPs are expected to be a fascinating candidate for efficient microwave absorption material with lightweight and thin thickness.
Yong Zhang,Lizhen Wang,Aiqin Zhang,Yanhua Song,Xiaofeng Li,Xingbing Wu,Peipei Du,Lv Yan 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.2
To improve the specific capacitance and energy density of electrochemical capacitor, nanostructured NiO was prepared by high temperature solid-state method as electrode material. The crystal structure and morphology of as-parepared NiO samples were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Cyclic voltammetry (CV) measurement was applied to investigate the specific capacitance of the NiO electrode. Furthermore,a novel mixed electrolyte consisting of NaOH, KOH, LiOH and Li_2CO_3 was prepared for the NiO capacitor,and the component and concentration of the four different electrolytes was examined by orthogonal test. The results showed that the NiO sample has cubic structure with nano-size particles, and the optimal composition of the electrolyte was: NaOH 2 mol L^(−1), KOH 3 mol L^(−1), LiOH 0.05 mol L^(−1), and Li_2CO_3 0.05 mol L^−1. At a scan rate of 10 mV s^(−1), the fabricated capacitor exhibits excellent electrochemical capacitive performance, while the specific capacitance and the energy density were 239 F g^(−1) and 85 Wh kg^(−1), which was higher than one-component electrolyte.
Jian Yang,Jie Li,Yunfeng Hu,Lizhen Li,Lijuan Long,Fazuo Wang,Si Zhang 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.1
High value utilization of byproduct of slaughterhousesis regarded as beneficial to both economy andenvironment. A hemoglobin degrading protease PA720was purified from fermentation broth of a Porites luteaassociated strain Streptomyces rutgersensis SCSIO 11720(SCSIO 11720) and exhibited maximal activity at 70°C,pH 10.5. The isolated strain was identified by genotypicmethod and 16 s RNA gene sequence was deposited inGenBank under accession No. KC414842. The enzymeexhibited excellent thermostability since it was stable at 70°Cwith t1/2 value of 1,386.3 min. Kinetic and thermodynamicstudy showed the activation energy (Ea), ΔG* (free energy),ΔH* (enthalpy) and ΔS* (entropy) for protease deactivationwere 62.71 kJ/mol, 74.26 kJ/mol, 59.86 kJ/mol, and-41.97 J/mol/K, respectively. Highest specific activity ofprotease PA720 was observed when using casein (9,953 U/mg)and hemoglobin (9,854 U/mg) as substrates. Hemoglobinhydrolysate prepared by protease PA720 showed significantantibacterial activity towards Escherichia coli, Staphylococcusaureus and Bacillus subtilis, indicating this protease couldbe used as an instrumental enzyme for production ofhemoglobin-based antibacterial peptides. Based on partialamino acid sequences of the enzyme PA720, the full geneencoding this protease was obtained by degenerate primerPCR and has been deposited in GenBank under accessionNo. KC414842. The deduced amino acid sequence exhibitshomology with other microbial thermophilic proteases insubtilisin family.
Lu Wu,Yan Lai,Ying Wang,Lixia Tan,Lizhen Wen,Huasheng Yang 한국식품영양과학회 2020 Journal of medicinal food Vol.23 No.4
Hordei Fructus Germinatus (HFG) has been used as a traditional medicine to treat functional dyspepsia (FD) in China. Stir fried HFG (F-HFG) containing Maillard reaction products (MRPs) is used more widely than the raw HFG (R-HFG). However, the exact mechanisms in its functionality remain unclear. This article investigated the effect of R-HFG, F-HFG, and MRPs on brain-gut peptides, gut microbiota, and digestive enzymes using an FD animal mode. After administration of R-HFG, F-HFG, and MRPs, higher mRNA expression level of gastrin (GAS) and lower mRNA expression level of vasoactive intestinal peptide (VIP) were exhibited in F-HFG and MRPs rats than R-HFG rats (P < .05). Furthermore, compared with the R-HFG group, the contents of motilin (MTL) and GAS showed an upward tendency, whereas the contents of VIP and chokcystokinin (CCK) showed a downward tendency in the F-HFG group. In addition, bacterial communities in the control, F-HFG, and MRPs groups clustered closely to one another, and bacterial communities in the model and recovery groups clustered together, whereas the bacterial communities in the R-HFG group were clustered into a category. Moreover, there were no apparent differences in brain-gut peptides and gut microbiota between the F-HFG and MRPs groups. However, after the oral administration of R-HFG, F-HFG, and MRPs, the level of digestive enzyme did not show a significant change as compared with the recovery group. These results indicated that the stronger effect of F-HFG could be attributed to the MRPs produced during stir frying, and MRPs possessed the effect of regulating brain-gut peptides and gut microbiota.