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- 저자 : Zuo-an Li (검색결과 4 건)
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PENG AN,FANG ZUO,XINHUA LI,YUANPENG WU,JUNHUA ZHANG,ZHAOHUI ZHENG,XIAOBIN DING,YUXING PENG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2013 NANO Vol.8 No.6
A biomimetic and facile approach for integrating Fe3O4 and Au with polydopamine (PDA) was proposed to construct gold-coated Fe3O4 nanoparticles (Fe3O4@Au–PDA) with a core–shell structure by coupling in situ reduction with a seed-mediated method in aqueous solution at room temperature. The morphology, structure and composition of the core–shell structured Fe3O4@Au–PDA nanoparticles were characterized by transmission electron microscopy (TEM), X-ray powder diffraction (XRD) and X-ray photoelectron spectrometry (XPS). The formation process of Au shell was assessed using a UV-Vis spectrophotometer. More importantly, according to investigating changes in PDA molecules by Fourier transform infrared spectroscopy (FTIR) and in preparation process of the zeta-potential data of nanoparticles, the mechanism of core–shell structure formation was proposed. Firstly, PDA-coated Fe3O4 are obtained using dopamine (DA) self-polymerization to form thin and surface-adherent PDA films onto the surface of a Fe3O4 "core". Then, Au seeds are attached on the surface of PDA-coated Fe3O4 via electrostatic interaction in order to serve as nucleation centers catalyzing the reduction of Au3+ to Au0 by the catechol groups in PDA. Accompanied by the deposition of Au, PDA films transfer from the surface of Fe3O4 to that of Au as stabilizing agent. In order to confirm the reasonableness of this mechanism, two verification experiments were conducted. The presence of PDA on the surface of Fe3O4@Au–PDA nanoparticles was confirmed by the finding that glycine or ethylenediamine could be grafted onto Fe3O4@Au–PDA nanoparticles through Schiff base reaction. In addition, Fe3O4@Au–DA nanoparticles, in which DA was substituted for PDA, were prepared using the same method as that for Fe3O4@Au–PDA nanoparticles and characterized by UV-Vis, TEM and FTIR. The results validated that DA possesses multiple functions of attaching Au seeds as well as acting as both reductant and stabilizing agent, the same functions as those of PDA.
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Influence of Fe Addition on Microstructure and Properties of Cu-Ag Composite
Xiaowei Zuo,Jianzheng Zhu,Bailing An,Ke Han,Rui Li,Engang Wang 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.5
We investigated the effects of Fe content on microstructure and properties in as-cast and as-drawn Cu-(5.1-x)vol%Ag-x vol%Fe alloys. In microscale, increasing Fe content first refined and then coarsened Cu dendrites. Innanoscale, the size and length of Ag precipitates in Fe-doped alloys were smaller than the size and length of Ag precipitatesin Fe-free alloy, and the γ-Fe precipitates in Cu-2.9 vol%Ag-2.4 vol%Fe alloy were finer than the γ-Feprecipitates in Cu-5.1 vol%Fe alloy. The maximum hardness in as-cast Cu-Ag-Fe alloys was found in the Cu-2.9vol%Ag-2.4 vol%Fe alloy. With increasing drawing strain, both ultimate tensile strength and hardness of Cu-Ag-Fe composites were increased. Simulation data among the relative volume fractions of Fe, hardness and electricalconductivity showed that, as the relative value approached 40%, the Cu-Ag-Fe composite displayed greater hardnessthan other samples. As a small amount of Ag was replaced by Fe, the electrical conductivity decreased significantlywith a descending slope of approximately 3%IACS (International Annealed Copper Standard) per vol%Fe. As 47 vol%Ag was replaced by Fe, however, the electrical conductivity decreased by 51% and remainedalmost invariable with further increasing Fe content. After annealing at 450 °C for 4 h, the electrical conductivityof the Cu-2.9 vol%Ag-2.4 vol%Fe composite was elevated up to 68.3%IACS from 38.5%IACS.
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Weighted composition operators on Bers-type spaces of Loo-Keng Hua domains
Zhi-Jie Jiang,Zuo-an Li 대한수학회 2020 대한수학회보 Vol.57 No.3
Let $\mbox{HE}_I$, $\mbox{HE}_{II}$, $\mbox{HE}_{III}$ and $\mbox{HE}_{IV}$ be the first, second, third and fourth type Loo-Keng Hua domain respectively, $\vp$ a holomorphic self-map of $\mbox{HE}_I$, $\mbox{HE}_{II}$, $\mbox{HE}_{III}$, or $\mbox{HE}_{IV}$ and $u\in H(\M)$ the space of all holomorphic functions on $\M\in\{\mbox{HE}_I, \mbox{HE}_{II}, \mbox{HE}_{III}, \mbox{HE}_{IV}\}$. In this paper, motivated by the well known Hua's matrix inequality, first some inequalities for the points in the Bers-type spaces of the Loo-Keng Hua domains are obtained, and then the boundedness and compactness of the weighted composition operators $W_{\vp,u}:f\mapsto u\cdot f\circ\vp$ on Bers-type spaces of these domains are characterized.
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WEIGHTED COMPOSITION OPERATORS ON BERS-TYPE SPACES OF LOO-KENG HUA DOMAINS
Jiang, Zhi-jie,Li, Zuo-an Korean Mathematical Society 2020 대한수학회보 Vol.57 No.3
Let HE<sub>I</sub>, HE<sub>II</sub>, HE<sub>III</sub> and HE<sub>IV</sub> be the first, second, third and fourth type Loo-Keng Hua domain respectively, 𝜑 a holomorphic self-map of HE<sub>I</sub>, HE<sub>II</sub>, HE<sub>III</sub>, or HE<sub>IV</sub> and u ∈ H(𝓜) the space of all holomorphic functions on 𝓜 ∈ {HE<sub>I</sub>, HE<sub>II</sub>, HE<sub>III</sub>, HE<sub>IV</sub>}. In this paper, motivated by the well known Hua's matrix inequality, first some inequalities for the points in the Bers-type spaces of the Loo-Keng Hua domains are obtained, and then the boundedness and compactness of the weighted composition operators W<sub>𝜑,u</sub> : f ↦ u · f ◦ 𝜑 on Bers-type spaces of these domains are characterized.
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