Large third-order optical nonlinearity of ZnO–Bi2O3–B2O3 glass–ceramic containing Bi2ZnB2O7 nanocrystals

Homogeneous transparent optical glass–ceramics precipitated with unique nonlinear crystals are promising materials for photonic applications. We have utilized heat treatment method to prepare transparent ZnO–Bi₂O₃–B₂O₃ glass–ceramic containing Bi₂ZnB₂O₇ nonlinear nanocrystals. A large third-order nonlinear susceptibility χ⁽³⁾ of glass–ceramic is measured by Z-scan technique, which mainly attributed to unique [BiO₆] and [B₂O₅] units in Bi₂ZnB₂O₇ crystal structure and the quantum size effect of nanoparticles. The discovery is of great potential in the application of nonlinear optical integrated devices.     

多水体系单核Mn(Ⅱ)配合物的合成、晶体结构和氢键研究

采用缓慢蒸发溶剂的方法,在去离子水中合成了单核Mn(Ⅱ)配合物[Mn(phen)2(H2O)2]·(H2O)6·SO4(phen=1,10-邻菲罗啉)。利用X射线单晶衍射和元素分析等表征手段确定了其结构和组成。该配合物属于三斜晶系,空间群为P-1。该配合物的中心离子为Mn(Ⅱ),中心离子与两个1,10-邻菲罗啉和两个水分子配位,在晶胞中还有六个未配位的水分子和一个自由的硫酸根离子。配合物中存在多种结构的氢键,包括平面三角形、四面体形、四边形、五边形和六边形。     

液晶材料中间体-4-(反式,反式-4-丙基双环己基)苯乙酮的合成

液晶材料目前的制备方法复杂,市场上成熟的原料合成路线基本没有。要制备性能优异的、使用广泛的液晶材料需要多步反应。以市场中常见的4-(反式,反式-4-丙基双环己基)苯为原料,经傅克酰基化反应得到目标产物。主要考察了4-(反式,反式-4-丙基双环己基)苯乙酮的合成条件,如酰基化反应溶剂、酰基化反应温度、酰基化反应时间及水解反应溶剂四个条件的影响,确定了合成反应的最佳条件。并采用红外光谱和核磁共振方法确证了目标产物。     

聚氨酯防水涂料的发展

聚氨酯涂料因其优异的防水性能,已广泛应用于建筑领域。介绍了我国聚氨酯防水涂料的现状。简单总结了聚氨酯防水涂料组成、分类和今后的发展趋势。     

Standard color liquid crystal displays by a dimming technology

Dimming technologies have been used in liquid crystal display (LCD) products, especially for mobile applications, to reduce power consumption. It is widely known that dimming technologies tend to degrade the color accuracy. This article, however, presents that color performance of a dimmed LCD is better than a conventional one. We show a max method, one of dimming methods, converting an input digital data into higher values that have less color shift phenomenon. We propose how to compare the color performance of original and dimmed colors based on a modified standard. The average value of measured Δu′v′ of 25 dimmed colors was 0.0040, whereas that of the original colors was 0.0190. In addition, the average value of measured Δ of 25 dimmed colors was 2.40, whereas that of the original colors was 9.24. The measured results prove that the dimming technology can make LCD better in not only power consumption but also color performance. This article is the world's first report that breaks the usual stereotype on dimming technologies. This work proposes a dimmed LCD as a standard color display. © 2013 Wiley Periodicals, Inc. Col Res Appl, 39, 480–485, 2014     

噻唑腙1-(1-苯基乙酰基)-2-(噻唑[5,4-b]吡啶基)肼的合成及结构表征

文章从2-氯-3-氨基吡啶出发,经四步反应合成了一个含噻唑的腙类化合物1-(1-苯基乙酰基)-2-(噻唑[5,4-b]吡啶基)肼,并通过红外、核磁及X-射线单晶衍射等表征了该化合物的结构。该化合物的晶体属单斜晶系,P2(1)/c空间群,晶胞参数:a=11.671(8)?,b=9.435(6)?,c=13.120(9)?,β=116.340(6)°,V=1294.7(15)?3,Z=4,Dc=1.377 mg/m3,R1=0.0406。该化合物通过分子间氢键作用形成一维链状结构。     

工业化湿法合成氧化铁红工艺中晶种制备和二步氧化机理的探讨及应用

从工业化大生产角度总结和探讨湿法合成氧化铁红工艺中硝酸晶种和硫酸晶种的不同制法和原理,以及它们晶型变化过程及条件。同时对二步氧化过程中硝酸亚铁和硫酸亚铁形成Fe2O3的原理进行了总结、探讨及应用。     

溶胶-凝胶法制备块状Nd:YAG微晶玻璃初探

YAG晶体作为一种性能优越的激光材料,在性能的提升上存在着很多空间,而通过采用制备方法的改良是非常好的选择。溶胶凝胶法是近年来为制备功能材料的新方法,采用这种方法来制备块状Nd:YAG微晶玻璃是存在探索的意义与价值的。     

金属铕配合物的合成及其晶体结构

合成了席夫碱N-亚水杨基-2-氨基吡啶,并以此为有机配体与过渡金属铕反应,得到了相应的配合物,且在一定的条件下培养得到配合物的单晶,解析出其晶体结构,并对其进行了荧光性质研究。     

芴液晶的研究进展

介绍了近年来芴液晶的研究进展,包括以芴酮(醇)及9位取代芴为核心的液晶化合物,阐述了这类化合物的结构与液晶性质及光电性质之间的关系。该类化合物在光电发光材料、有机太阳能电池材料等领域有广泛的应用前景。