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186 results on '"Zhang, Yi-Dong"'

59. From nanoplates to microtubes and microrods: a surfactant-free rolling mechanism for facile fabrication and morphology evolution of Ag2S films

Author

Li, Da-Peng, Zheng, Zhi, Lei, Yan, Yang, Feng-Ling, Ge, Su-Xiang, Zhang, Yi-Dong, Huang, Bao-Jun, Gao, Yuan-Hao, Wong, Ka-Wai, Lau, Woon-Ming, Li, Da-Peng, Zheng, Zhi, Lei, Yan, Yang, Feng-Ling, Ge, Su-Xiang, Zhang, Yi-Dong, Huang, Bao-Jun, Gao, Yuan-Hao, Wong, Ka-Wai, and Lau, Woon-Ming

Abstract

By a simple and facile wet-chemistry technique without any surfactant, various shapes of Ag2S crystals-including leaflike pentagonal nanoplates, crinkly nanoscrolls, hexagonal prismlike microtubes, and microrods-were fabricated in situ on a large-area silver-foil surface separately. Detailed experiments revealed that the Ag2S nanoplates were formed just by immersing the silver foil in a sulfur/ethanol solution at room temperature and atmospheric pressure, and they subsequently rolled into nanoscrolls and further grew into microtubes and microrods under solvothermal conditions. Inspired by the natural curling of a piece of foliage, we proposed a surfactant-free rolling mechanism to interpret the observed morphological evolution from lamellar to tubular structures. Based on these simple, practical, and green chemical synthetic routes, we can easily synthesize lamellar, scrolled, tubular, and clubbed Ag2S crystals by simply adjusting the reaction temperature, pressure, and time. It is very interesting to note that the current rolling process is quite different from the previous reported rolling mechanism that highly depends on the surfactants; we revealed that the lamellar Ag2S could be rolled into tubular structures without using any surfactant or other chemical additives, just like the natural rolling process of a piece of foliage. Therefore, this morphology-controlled synthetic route of Ag2S crystals may provide new insight into the synthesis of metal sulfide semiconducting micro-/nanocrystals with desired morphologies for further industrial applications. The optical properties of the pentagonal Ag2S nanoplates/film were also investigated by UV/Vis and photoluminescence (PL) techniques, which showed large blue-shift of the corresponding UV/Vis and PL spectra. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Published
2011

99. Synthesis and Crystal Structures of Two Heterobinuclear Nickel Polymers [NiNaL(dca)] n and [NiNaL(dca)] 2n ·(CH 3 COOCH 3 ) n ·(H 2 O) n.

Author

Zhang, Yi-Dong, Zhang, Shu-Hua, Ge, Chen-Min, Wang, Ying-Guang, Huang, Ying-Heng, and Li, HePing

Subjects
*CRYSTAL structure, *POLYMERS, *NICKEL, *INORGANIC synthesis, *DICYANDIAMIDE, *ETHYLENEDIAMINE
Abstract

At the same condition, utilizing the different of base, the authors constructed two wholly different compounds, 1 and 2. Compounds 1 and 2 are one-dimensional (1D) chainlike, while the coordination mode of dicyandiamide is different in both complexes. In 1, the dicyandiamide isμ1,5-dca bridged coordination mode; in 2, that isμ1,3-dca bridged coordination mode. Two new heterobinuclearnickeland sodium polymers[NiN a(L)(dca)]n(1) and [NiNa(L)(dca)]2n·(CH3COOCH3)n·(H2O)n, (2) [where H2L = N,N′-bis(3-ethoxy- salicylidene)ethylenediamine, dca = N(CN)2–], were synthesized and characterized by elemental analysis and X-ray crystal diffraction. The heterobinuclear complex 1, C22H22N5NaNiO4, crystallizes in the monoclinic system space groupP21/c, witha= 8.0955 (7) Å,b= 22.1988 (18) Å,c= 12.9314 (11) Å;β= 103.4700(10)°;Z= 4;S= 1.01;V= 2260.0(3) Å3;DCalcd= 1.476 gcm–3;F(000) = 1040;μ= 0.92 mm–1;R1= 0.041;wR2= 0.104. The complex2,C23.50H27N5NaNiO5.50, the crystals belong to the monoclinic system, space groupC2/c, witha= 31.553 (8) Å,b= 12.836 (3) Å,c= 13.264 (3) Å;β= 111.234 (4)°;Z= 8;S= 0.95;V= 5007.6 (19)Å3;DCalcd= 1.457 gcm–3;F(000) = 2288;μ= 0.84 mm–1;R1= 0.072;wR2= 0.211. Complexes 1 and 2 are bothaxisymmetricheterobinuclearnickelcomplexes. The geometry around nickel atoms can be described as a slightly distortedplane geometry, andsodium atomsthat as a slightly distorted octahedral geometry. Complexes 1 and 2 are bothone-dimensional (1D) chainlike supramolecular structurebridgedby dicyandiamide to form the polymer. The coordination mode of dicyandiamide is different in both complexes. In 1, the dicyandiamide is μ1,5-dcabridgedcoordination mode; in 2, that is μ1,3-dcabridgedcoordination mode by dicyandiamide. Supplemental materials are available for this article. Go to the publisher's online edition ofSynthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistryto view the supplemental file. [ABSTRACT FROM AUTHOR]

Published
2013
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100. Comparative Analysis of Gene Expression in Two Muskmelon Cultivars (Cucumis meloL.) Under Salt Stress

Author

WEI, Shi-wei, ZHANG, Fu-rong, ZHANG, Yi-dong, WANG, Li-min, CHEN, Jia-bei, and HUANG, Dan-feng

Abstract

Salinity is one of the most important abiotic stresses that adversely affects crop growth and productivity. A subtractive suppression hybridization (SSH) library were constructed from the roots of salt-sensitive Yulu cultivar melon seedlings under salt stress; 557 high-quality expressed sequence tags (ESTs) were randomly sequenced, with an average size of 428 bp, which assembled into 68 contigs and 315 singletons. Compared with our previous SSH library generated from the salt-tolerant Bingxuecui cultivar, the proportion of transcripts involved in metabolism, protein fate, cellular communication/signal transduction mechanisms, and cell rescue/defense were 4, 1.46, 0.94, and 0.4% higher, respectively, in the salt-tolerant cultivar than the in salt-sensitive cultivar. Quantitative real-time PCR analysis of eleven transcripts revealed temporal variations in their expression in the two cultivars under salt stress. One NACgene (JZ477011) was heterologously expressed in yeast for functional characterization, and enhanced the sensitivity of yeast cells to high-salinity to salt stress and inhibited their growth. Information regards to their functions would aid in the understanding of response mechanisms to saline stress and in the development of molecular markers for selecting salt-tolerant melon cultivars.

Published
2014
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