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Wafer-scale synthesis of monolayer two-dimensional porphyrin polymers for hybrid superlattices
Zhong, Yu,Cheng, Baorui,Park, Chibeom,Ray, Ariana,Brown, Sarah,Mujid, Fauzia,Lee, Jae-Ung,Zhou, Hua,Suh, Joonki,Lee, Kan-Heng,Mannix, Andrew J.,Kang, Kibum,Sibener, S. J.,Muller, David A.,Park, Jiwoon American Association for the Advancement of Scienc 2019 Science Vol.366 No.6471
<P><B>Single-layer porphyrin polymerization</B></P><P>Two-dimensional polymers can be made as monolayer sheets through controlled synthesis at an interface. However, it is often difficult to create intact sheets over large areas that can be transferred onto substrates. Zhong <I>et al.</I> polymerized derivatized porphyrin molecules during laminar flow at a sharp pentane-water interface to form sheets that are 5 centimeters in diameter (see the Perspective by MacLean and Rosei). The authors used electron microscopy and spectroscopy to confirm that they had produced intact monolayers. These films were then transferred onto monolayer sheets of molybdenum disulfide to form superlattices for use as capacitors.</P><P><I>Science</I>, this issue p. 1379; see also p. 1308</P><P>The large-scale synthesis of high-quality thin films with extensive tunability derived from molecular building blocks will advance the development of artificial solids with designed functionalities. We report the synthesis of two-dimensional (2D) porphyrin polymer films with wafer-scale homogeneity in the ultimate limit of monolayer thickness by growing films at a sharp pentane/water interface, which allows the fabrication of their hybrid superlattices. Laminar assembly polymerization of porphyrin monomers could form monolayers of metal-organic frameworks with Cu<SUP>2+</SUP> linkers or covalent organic frameworks with terephthalaldehyde linkers. Both the lattice structures and optical properties of these 2D films were directly controlled by the molecular monomers and polymerization chemistries. The 2D polymers were used to fabricate arrays of hybrid superlattices with molybdenum disulfide that could be used in electrical capacitors.</P>
Zhongyu Liang,Zhang Yina,Li Taofeng 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.6
Building materials stand as a crucial cornerstone in the realm of architecture in China. Enhancing the processing technologyof diverse building materials to effectively elevate the level of architectural art has emerged as a prominent research focus. Inlight of this, the paper develops an analysis model centered on the influence of architectural art, utilizing the Taurus searchalgorithm. The study delves into the impact of distinct processing technologies on the diversified artistic expression of buildings. It commences with an analysis of the current state of building materials processing technologies and their connection toarchitectural art. Following this, the paper constructs an analysis model elucidating the influence of architectural art, examiningits effects on diversified artistic expression through experiments. Finally, by amalgamating established building materialsprocessing technology with experimental verification, the paper scrutinizes the actual efficacy of the analysis model forthe influence of architectural art based on the Taurus search algorithm. The experimental outcomes underscore the variedinfluence of different processing technologies on the diversity of artistic expression in buildings, showcasing the quantitativeevaluation capabilities of the impact analysis model.
Symplectic Elasticity Analysis of Stress in Surrounding Rock of Elliptical Tunnel
Zhongyu Jiang,Guoqing Zhou,Li Jiang 대한토목학회 2020 KSCE Journal of Civil Engineering Vol.24 No.10
A large number of non-circular tunnels are widely used in engineering practice. The application of these geometric structures not only makes the boundary conditions of mechanical problems more complex, but also makes the theoretical solution more difficult. The introduction of curvilinear coordinate system can easily transform the elliptical region into a circular region, and the physical relationship can also be adjusted accordingly. In the state space, the transformed problem can be solved by using the dual variables of Hamiltonian mechanics, and the special solution equation can be obtained. With regard to the non-homogeneous boundary conditions of general engineering problems, Fourier expansion is used to transform them into algebraic sums. According to the special solution equation, the relationship between the direction eigenvalues and the angle coefficients of each order of the expansion term is found. Then the analytical solution of the non-homogeneous problem is obtained by superposing the special solutions of the expansion terms of each order. By comparing the calculation results of the boundary stress around the elliptical tunnel, it can be seen that the results are completely consistent with the finite element calculation results, which verifies the correctness and reliability of the method in this paper. This paper analyzes the influence of internal pressure, lateral pressure coefficient and elliptical shape coefficient on the circumferential stress around the elliptical hole, and obtains the following conclusions: increasing the internal pressure of the elliptical hole can effectively reduce the circumferential compressive stress at the hole edge; when the lateral pressure coefficient approaches 1, the circumferential stress distribution around the elliptical hole tends to be uniform; the minimum value of the circumferential stress around the elliptical hole is independent of the shape coefficient, while the maximum value is closely related to the shape coefficient. The research results can not only provide specific theoretical guidance for the construction and construction of elliptical tunnel, but also expand the application scope of the symplectic elasticity method.
Zhongyu Duan,Guoli Ma,Wenjun Zhang 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.12
A novel copper nanoparticles were synthesized from cupric sulfate using hydrazine as reducing reagents. A series of aromatic nitro compounds were reacted with sodium borohydride in the presence of the copper nanoparticles catalysts to afford the aromatic amino compounds in high yields. Additionally, the catalysts system can be recycled and maintain a high catalytic effect in the reduction of aromatic nitro compounds.
Zhongyu Zhang,Caifeng Bi,Yuhua Fan,Nan Zhang,Xingchen Yan,Jian Zuo,Xia Zhang 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.6
A novel complex [Zn(phen)(o-AB)2] [phen: 1,10-phenanthroline o-AB: o-aminobenzoic acid] was synthesized and characterized by elemental analysis and X-ray diffraction single-crystal analysis. The crystal crystallizes in monoclinic, space group P2(1)/c with a = 7.6397(6) Å, b = 16.8761(18) Å, c = 17.7713(19) Å, α = 90°, β = 98.9570(10)°, γ = 90°, V = 2.2633(4) nm3, Z = 4, F(000) = 1064, S = 1.058, Dc = 1.520 g·cm−3, R1 = 0.0412, wR2 = 0.0948, μ = 1.128 mm−1. The Zn(II) is six coordinated by two nitrogen and four oxygen atoms from the 1,10-phenanthroline and o-aminobenzoic acid to furnish a distorted octahedron geometry. The complex exhibits intense fluorescence at room temperature. Theoretical studies of the title complex were carried out by density functional theory (DFT) B3LYP method. CCDC: 898291.
Machining approaches with smart algorithms for ultrasonic precision machining
Zhongyu Liang,Yabo Liu,Nan Hu 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.5
Ultrasonic precision machining is an advanced manufacturing process that combines ultrasonic vibrations with traditionalmachining techniques to achieve high precision and efficiency. This article provides a comprehensive overview of the ultrasonicprecision machining process, its principles, applications, advantages, and challenges. It explores the various machiningparameters, tool configurations, and experimental setups employed in ultrasonic machining. Furthermore, the article discussesthe materials suitable for ultrasonic machining and the effects of ultrasonic vibrations on the machining performance andsurface quality. The review also highlights the recent advancements and emerging trends in ultrasonic precision machining,including hybrid machining approaches and intelligent process monitoring. Overall, this article aims to provide a valuableresource for researchers, engineers, and manufacturers interested in understanding and harnessing the potential of ultrasonicprecision machining.
Duan, Zhongyu,Ma, Guoli,Zhang, Wenjun Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.12
A novel copper nanoparticles were synthesized from cupric sulfate using hydrazine as reducing reagents. A series of aromatic nitro compounds were reacted with sodium borohydride in the presence of the copper nanoparticles catalysts to afford the aromatic amino compounds in high yields. Additionally, the catalysts system can be recycled and maintain a high catalytic effect in the reduction of aromatic nitro compounds.
Zhang, Zhongyu,Bi, Caifeng,Fan, Yuhua,Zhang, Xia,Zhang, Nan,Yan, Xingchen,Zuo, Jian Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.6
A novel complex [$Zn(phen)(o-AB)_2$] [phen: 1,10-phenanthroline o-AB: o-aminobenzoic acid] was synthesized and characterized by elemental analysis and X-ray diffraction single-crystal analysis. The crystal crystallizes in monoclinic, space group P2(1)/c with $a=7.6397(6){\AA}$, $b=16.8761(18){\AA}$, $c=17.7713(19){\AA}$, ${\alpha}=90^{\circ}$, ${\beta}=98.9570(10)^{\circ}$, ${\gamma}=90^{\circ}$, $V=2.2633(4)nm^3$, Z = 4, F(000) = 1064, S = 1.058, $Dc=1.520g{\cdot}cm^{-3}$, $R_1=0.0412$, $wR_2=0.0948$, ${\mu}=1.128mm^{-1}$. The Zn(II) is six coordinated by two nitrogen and four oxygen atoms from the 1,10-phenanthroline and o-aminobenzoic acid to furnish a distorted octahedron geometry. The complex exhibits intense fluorescence at room temperature. Theoretical studies of the title complex were carried out by density functional theory (DFT) B3LYP method. CCDC: 898291.