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六角相GaN 外延膜的高分辨X 射线衍射分析研究
关键字：高分辨X 射线衍射,异质外延,GaN 材料
通过实例介绍运用高分辨X 射线衍射分析技术对GaN 异质外延薄膜材料的微结构进行研究，希望能获得不同缓冲层生长与优化工艺以及结构模型对其结构特性参数影响方面的信息，为GaN 材料和器件制备者提供有用的参考。
http://www.polymer.cn/research/dis_info6120 |
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扫描小角X射线散射研究单轴取向高密度聚乙烯的结构演化
关键字：小角X 射线散射 高密度聚乙烯 长周期
高密度聚乙烯（HDPE）是一种最简单的聚合物，它被广泛应用于各个领域，例如输水，输气和输油的管道，高强度的纤维和容器。所有这些应用都依赖于固体高密度聚乙烯平衡的力学性能，包括它的模量，化学结构和力学上的抗断裂性。在很大程度上，高密度聚乙烯的力学性质依赖其微观结构和形态。凝固后的聚乙烯，就像许多其他的可结晶聚合物一样，结晶生成周期性排列的片晶，而片晶之间是无定形的聚合物链，形成所谓的半结晶状态。为了获得...
http://www.polymer.cn/research/dis_info4862 |
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SrTiO3 薄膜材料的高分辨率X射线衍射分析研究
关键字：高分辨X射线衍射 外延生长 弛豫态的点阵常数
本文应用高分辨X射线衍射（HRXRD+ TAXRD）技术对外延生长的SrTiO3膜进行了分析，获得了有关该薄膜的晶体取向、衬底的结构特性以及弛豫态的点阵常数等信息，对今后改进SrTiO3系列样品生长工艺有重要的意义。
http://www.polymer.cn/research/dis_info92 |
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High performance organic nonvolatile memory transistors based on HfO2 and poly(alpha-methylstyrene) electret hybrid charge-trapping layers
In this work, we fabricated a high performance flash-type organic nonvolatile memory transistor, which adopted polymer-electret poly(a-methylstyrene) (PaMS) and HfO2 films as hybrid charge trapping layer (CTL). Compared with a single HfO2 or PaMS CTL structure, the hybrid HfO2/PaMS CTL structure can provide enhanced charge trapping efficiency to increase the device operation speed and reduce the...
http://www.polymer.cn//ss/Luxubing/publicationsshow_12572.html |
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Organoselenium-Catalyzed Baeyer-Villiger Oxidation of alpha,beta-Unsaturated Ketones by Hydrogen Peroxide to Access Vinyl Esters
By carefully screening the organoselenium pre-catalysts and optimizing the reaction conditions, simple dibenzyl diselenide was found to be the best pre-catalyst for Baeyer–Villiger oxidation of (E)-α,β-unsaturated ketones with the green oxidant hydrogen peroxide at room temperature. The organoselenium catalyst used in this reaction could be recycled and reused several times. This new method was...
http://www.polymer.cn//ss/zhangming/publicationsshow_10529.html |
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alpha-Helix C-Terminus Acting as a Relay to Mediate Long-Range Hole Migration in Proteins
Ab initio calculations suggest that the C-terminus of an α-helix can serve as a novel relay element for long-range charge migration in proteins, as an addition or alternative to the known relay properties of aromatic and S-containing amino acids. The relay ability of an α-helical C-terminus varies with helix length, capping, proximal group competition, and helix twisting/bending. The vertical io...
http://www.polymer.cn//ss/chenxiaohua/publicationsshow_9095.html |
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Complexation behavior of alpha-, beta- and gamma-cyclodextrin in modulating and contructing polymer networks. Langmuir 2008, 24 (15), 8290-8296.
Complexation behavior of alpha-, beta- and gamma-cyclodextrin in modulating and contructing polymer networks.
http://www.polymer.cn//ss/guoxuhong/publicationsshow_2214.html |
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Functionalized poly(alpha-hydroxy acid)s via ring-opening polymerization: Toward hydrophilic polyesters with pendant hydroxyl groups
Two functionalized dilactones with protected hydroxyl groups, benzyloxymethyl methyl glycolide (4a) and benzyloxymethyl glycolide (4b), were synthesized and converted to the corresponding polyesters by ring-opening polymerization in the melt ( at 110 degrees C using benzyl alcohol and SnOct(2) as initiator and catalyst, respectively, and at 130 degrees C using SnOct(2) as catalyst or in solution a...
http://www.polymer.cn//ss/zhongzhiyuan/publicationsshow_1001.html |
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Novel donor-acceptor materials for organic light-emitting diodes based on alpha-cinnamoyl cyclic ketene dithioacetals
作者: Peng P (Peng, Ping), Sun SG (Sun, Shaoguang), Zhao YX (Zhao, Yixin), Wu WC (Wu, Weicai), Xia HJ (Xia, Haijian), Tian WJ (Tian, Wenjing), Liu Q (Liu, Qun)
来源出版物: JOURNAL OF LUMINESCENCE 卷: 126 期: 2 页: 464-468 出版年: OCT 2007 &...
http://www.polymer.cn//ss/tianwenjing/publicationsshow_918.html |
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岛津推出X射线光电子能谱仪（XPS） 应用文集（一）
人类社会对能源及健康的需求持续增长。能源材料方面，能源需求结构在发生变化，能源行业正在由传统的不可再生的化石能源向太阳能、氢能、核能、风能等新能源发展，新能源材料即指那些正在发展的、可能支持建立新能源系统满足各种新能源及节能技术的特殊要求的材料，具有广阔的应用前景。而生物材料方面，传统的无生命的医用金属、高分子、生物陶瓷等常规材料已不能满足医学发展的要求，现代医学对生物材料提出更高的要求，生物材...
http://www.polymer.cn/trading/news_detail_11260 |
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