Effect of Hydrophobic Chain of Dye Molecule and Surface of Active Crystal on the Organized Assemblies Formation of Dyes

Four derivatives of 5,5',6,6'-tetrachlorobenzimidazolocarbocyanine iodide with different long alkyl chain substituents in N-position of polymethine chromophore have been used for investigating the influence of hydrophobicity of dyes on the aggregation.It has been found that all dyes formed monomeric species in methyl alcohol. However, after addition of water to CH_3OH to change the polarity of the solvent, difference between dyes appeared.Addition of inorganic salt facilitated the J-aggregation of easy soluble dye, but it seems useless for the sparely soluble dye.Platelets cut from AgBr polycrystal or pressed AgBr powder have been used as substrate for adsorbing dyes. After addition of hexanoic acid, eventually the J-aggregate on AgBr surface could be destroyed.Voltammetry is a useful tool to investigate the interaction between dyes and AgBr. Experimental results showed that the longer the carbon chain substituents is, the stronger the interaction between AgBr and dyes would be.     

STUDIES ON POLYMERIZATION KINETICS OF METHYL METHACRYLATE AT HIGH CONVERSION

The bulk polymerization of methyl methacrylate which was carried out in a metallic dilatometer and in a differential scanning calorimeter has been studied over the complete course of the reaction. An attempt was made to quantitatively express the relation on the onset of gel effect and the final conversion with polymerization conditions such as temperature, kinds and concentration of initiators. It was demonstrated further that the final conversion of polymerization in homogeneous ideal systems is only dependent upon the reaction temperature.     

橡胶接枝苯乙烯本体共聚合全程动力学研究(Ⅰ)--接枝行为

橡胶接枝苯乙烯本体聚合的研究目前主要集中于预聚阶段接枝动力学和聚合条件对相转变的影响[1]. 对于后聚阶段, 即相转变后的接枝行为, 尤其是接枝率与橡胶相内包容物的关系、接枝率与高转化率聚合动力学的关系, 接枝率与橡胶相结构的关系等则研究很少. 这些因素对最终聚合物的性能起着至关重要的作用, 因此, 研究橡胶接枝苯乙烯本体聚合相转变以后接枝率的变化, 并找出橡胶相形态演绎过程的规律很有意义.     

菁染料与溴化银相互作用性质的研究

本文用计时电位法及电位滴定研究了十六种不同染料与溴化银之间的相互作用,进一步证明了具有离域π-电子的菁染料才能与卤化银形成络合物的论点。从得到的平衡常数K表明,固体表面上的卤化银-染料与溶液中银离子-染料具有相同键性质,都是银离子与染料离域π-电子作用的结果。     

聚吡咯(PPy)对细菌视紫红质(bR)的光电性能的影响

细菌视紫红质(bacteriorhodopsin,用bR表示)是嗜盐菌(halobacterium halobium)紫膜中发现的唯一蛋白质,由于具有独特质子泵和光色互变功能以及高稳定性,而成为理想的生物材料。在光照下,它产生典型的微分脉冲电信号^[1],而且响应快,这对于它在信息存储、仿视觉系统等应用方面有极大的应用前景。     

染料聚集态中空穴传递的顺磁共振研究

本文应用了顺磁共振波谱技术,研究了染料J-聚集体对染料正空穴俘获电子的影响。实验所用乳剂是未经化学增感的溴化银(AgBr),染料用量2.5×10^-4摩尔染料/摩尔银。涂片厚度为3微米左右。     

CONCENTRATION EFFECT OF SENSITIZING DYE ON SPECTRAL SENSITIZATION OF SILVER HALIDE

The effect of concentration of four dyes has been investigated, which are of similar mo-lecular structures, same spectroscopic absorption spectra, and very close values in redox po-tential upon the spectral sensitization of photographic emulsion. The results have shownthat dyes which are liable to form J-aggregate diminish the effect of dye-induced desensiti-zation, while dyes which are not easy to form J-aggregate exhibit a very strong effect ofdye-induced desensitization. According to phosphorescence and electrochemistry experimentalresults, we could assume that the aggregate state acts in a way to regenerate the oxidizeddye, thus being favorable to the spectral sensitization. In this paper, the factor of inhibi-tion of development by dye adsorption has also been proposed to be a factor which cannotbe neglected in dye-induced desensitization.     

水溶性菁染料与类脂物混合单分子膜中J-聚集体形成的研究

报道了具有相同发色团,并有不同电荷的二种菁染料单分子膜中J-聚集体的形成。测定了单分子膜的π/A,△V/A曲线,反射光谱及吸收光谱。从实验结果得出:带正电荷的染料与花生酸混合形成单分子膜后,膜中染料的二聚体与J-聚集体随着表面压力改变存在着一个平衡。而带负电荷的染料与二十烷基胺成膜后,即使在很低的表面压下也有J-聚集体形成。同时染料分子在水面上的取向是各向异性。     

N,N,N＇,N＇-四苄基取代方块菁染料LB膜研究

方块菁染料在有机光导材料^[1,2]、有机太阳能存储^[2,3]、光记录^[4、有机光盘中红外吸收器^[4]以及光纤识别功能薄膜等领域中有着广泛应用前景.