碳纳米管阵列超双疏性质的发现

用高温裂解酞菁金属络合物方法制备了几种具有不同形貌的阵列碳纳米管膜 ,并对其超疏水和超双疏性质进行了研究 .对于具有均匀长度和外径的阵列碳纳米管膜 ,文章作者发现 ,在未经任何处理时 ,其表现出超疏水和超亲油性质 ,与水的接触角为 15 8 5± 1 5° ,与油的接触角为 0± 1 0°.经氟化处理后 ,则表现出超双疏性质 ,与水和油的接触角分别为 171± 0 5°和 16 1± 1 0° .对具有类荷叶结构的阵列碳纳米管膜 ,其表面形貌与荷叶的十分接近 ,且在未经任何处理时所表现出的超疏水性也与荷叶的非常接近 ,与水的接触角为 16 6° ,滚动角为 8° .这种超疏水和超双疏性质是由表面的纳米结构以及微米结构和纳米结构的结合产生的 .这一发现为无氟超疏水表面 界面材料的研究提供了新的思路     

SILICON-CONTAINING POLY(p-ARYLENE VINYLENE)S:SYNTHESIS AND PHOTOPHYSICS

A series of new silicon-containing poly(p-arylene vinylene)s(PAVs)with anthracene units in the main chain were synthesized by hydrosilylation reaction.The introduction of organosilicon units improved the solubility of the polymers,and theπ-πconjugation of polymeric chains was interrupted.These polymers behaved as blue-green light emitters with their fluorescence maximum at 447—499 nm and quantum yields in the range of 0.28-0.30 in solution.     

萘锂还原二苯乙炔反应用于构建π-电子体系

萘锂用于二苯乙炔的还原时,依据二苯乙炔与萘锂的摩尔比,可产生1,2-二锂-1,2-二苯乙烯(1)和1,4-二锂-1,2,3,4-四苯基-1,3-丁二烯(2)两种反应中间体。通过选择不同的亲电试剂与相应的中间体反应,合成了一系列包括2,3,4,5-四苯基硅杂环戊二烯衍生物、多芳基取代乙烯/二烯类衍生物,以及含氟芳香并苯类化合物等的π-电子体系化合物。对所得的各新化合物进行了详细表征,并测定了部分化合物的单晶结构。     

含硅桥联并环π-共轭体系光电功能材料研究进展

近年来,由于含硅桥联并环π-共轭体系的独特结构特性以及分子的多样性、可设计性,在光电功能材料的研究中得到越来越多的关注.并环结构赋予体系以刚性共平面结构,使其共轭较非并环结构母体进一步增强,而硅桥的引入则可影响分子的电子结构进而影响材料的光电性能.母体结构及硅桥联方式的选择为分子结构设计和光电性能的改进提供了较大的空间.本文根据母体结构的不同,对硅桥联联苯体系、硅桥联噻吩体系以及硅桥联对二苯乙烯齐聚物体系光电功能材料的研究进展进行了综述.     

新型双硅桥联螺双芴聚合物的合成及荧光性质北大核心CSCD

合成了双硅桥联螺双芴聚合物,该聚合物固体最大荧光发射峰的位置为408nm,是良好的固态蓝光材料,热失重曲线说明聚合物的热稳定性好,在工业上有潜在的应用前景。     

A silazane additive for CsPbI2Br perovskite solar cells

Adding additives into peroskite precursor solution has been proven as a simple and efficient strategy to improve the quality of peroskite films. In this work, we demonstrate an effective additive strategy to improve the quality of all-inorganic perovskite films by adding a novel silazane additive heptamethyldisilazane (HDMS). The power conversion efficiency (PCE) of the optimized devices is enhanced from 14.55% to 15.31% with an open-circuit voltage over 1.26 V due to the higher quality perovskite films with lower trap density after the incorporation of HDMS. More interestingly, the HDMS devices exhibit superior humidity and thermal stability compared with the control ones. This work provides a simple and efficient strategy to enhance the device performance and stability of all-inorganic perovskite solar cells, which could facilitate its commercialization.     

Effect of flexible units on the properties of silicon-containing phenyleneethynylene hybrid oligomers

New silicon-containing phenyleneethynylene hybrid oligomers P2, P3, and P4 were synthesized via Sonogashira cross-coupling reactions of ethynyl-terminated silazane monomer N,N′-bis(4-ethynylphenyl)-1,1-diphenylsilazane(M1) and corresponding bis-(4-bromo-phenyl)-ended organosilicon unit containing monomers, respectively. These new oligomers were easily soluble in common solvents. The incorporation of flexible organosilicon units in the oligomers leads to blue-shift in both the UV-Vis absorption and fluorescence emission spectra similarly. The results of differential scanning calorimetry(DSC) indicate that the flexible units relieve the rigidity of oligomeric chain and provide favorable conformation for thermal cross-linking reactions. The oligomers show good thermal and thermal-oxidative stability from the thermogravimetric analysis(TGA), with their decomposition temperature at 10% weight loss(T10%) higher than 400 ?C under both nitrogen and air atmosphere.     

仿生各向异性聚(N-异丙基丙烯酰胺)水凝胶智能响应驱动器的研究进展

各向异性水凝胶在外界的响应刺激下可以具有不同的反应机制与驱动过程. 本文综述了近期基于PNIPAM水凝胶智能响应驱动器的设计方法, 总结了多种各向异性结构对驱动性能的影响, 并对该领域所面临的挑战进行了讨论.     

硅芴类化合物的合成及应用研究进展

近年来,芴类结构9-位为硅桥联的硅芴类化合物以其独特的电子结构和光电性能受到研究者们越来越多的关注,这类化合物在有机发光二极管(OLED)、聚合物太阳能电池(PSC)、有机场效应管(OFET)等光电功能材料领域有广泛的应用前景。本文主要对硅芴类化合物的合成方法、结构修饰、性能及应用研究的最新进展进行了综述。     

柱状结构阵列碳纳米管膜的超疏水性研究

浸润性是固体表面的重要性质之一 .决定固体表面的浸润性的两个主要因素中 ,化学性质是内因 ,而几何结构形貌也是不可缺少的重要因素 .通过改变固体表面的粗糙度可以改变其浸润性 [1～ 5] .通常 ,人们用水接触角的大小来衡量固体表面水的浸润性 ,水与固体表面的接触角大于 1 5