Micrometer Size Effect on Dye Association in Single Laser-Trapped Water Droplets
Micrometer Size Effect on Dye Association in Single Laser-Trapped Water Droplets
复制标题
微米尺寸对单个激光捕获水滴中染料缔合的影响
DOI：
10.1021/jp952351j
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
N. Kitamura
中科院分区：
文献类型：
--
作者：
H. Yao;Y. Inoue;H. Ikeda;K. Nakatani;Haeng;N. Kitamura
采用扫描激光操作和吸收光谱技术研究了孔雀石绿（MG）在分散于邻苯二甲酸二丁酯中的微米级水滴中的分子缔合，以阐明液滴/油界面化学过程的特征。在MG浓度较高时，除了615 nm的单体吸收带外，还在580 nm左右出现了新的吸收带。对MG在微滴中的浓度依赖性吸收光谱分析表明，580nm处的吸收光谱属于MG二聚体的吸收光谱。随着液滴直径的减小，MG在水滴中的二聚体形成更容易，证明了微米尺寸对染料缔合的影响。讨论了水/油界面对MG二聚体形成的作用。
Molecular association of malachite green (MG) in single micrometer-sized water droplets dispersed in di-n-butyl phthalate was studied by means of scanning laser manipulation and absorption spectroscopy to elucidate characteristic features of chemical processes at the droplet/oil interface. At a high MG concentration, the droplet showed a new absorption band around 580 nm in addition to the monomer band at 615 nm. Analyses of the concentration-dependent absorption spectrum of MG in the droplet indicated that the band at 580 nm could be assigned to that of the MG dimer. The dimer formation of MG in the water droplet was shown to be facilitated with decreasing the droplet diameter, demonstrating the micrometer size effect on dye association. A role of the water/oil interface for the MG dimer formation is discussed.