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arXiv 0812.0625cond-mat.mtrl-sci
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水溶性玫瑰红复合LB膜的形成

Formation of complex Langmuir and Langmuir-Blodgett films of water soluble rosebengal

S. Biswas, R. K. Nath, D. Bhattacharjee, Syed Arshad Hussain

摘要:

本文报道了水溶性的N-十六烷基-N,N,N-三甲基溴化铵(CTAB)分子与玫瑰红(RB)、硬脂酸(SA)分子通过电荷转移型相互作用在空气-水界面上形成复合的Langmuir单分子层。RB-CTAB-SA复合物单分子膜形成的反应动力学通过观察表面压力随时间的增加而监测,同时屏障保持固定。通过FTIR研究证实了相互作用动力学的完成。在所需的表面压力下,将空气-水界面处的这种复杂的Langmuir膜转移到固体基底上,以形成多层Langmuir-Blodgett膜。光谱表征揭示了一些分子水平的相互作用,以及形成的微晶聚集体依赖于CTAB和RB的摩尔比内复杂的LB膜。两种类型的物种在复杂的LB膜的存在下,证实了荧光光谱。

英文摘要:

This communication reports the formation of complex Langmuir monolayer at the air-water interface by charge transfer types of interaction with the water soluble N- cetyl N, N, N trimethyl ammonium bromide (CTAB) molecules doped with rosebengal (RB), with the stearic acid (SA) molecules of a preformed SA Langmuir monolayer. The reaction kinetics of the formation of RB-CTAB-SA complex monolayer was monitored by observing the increase in surface pressure with time while the barrier was kept fixed. Completion of interaction kinetics was confirmed by FTIR study. This complex Langmuir films at the air-water interface was transferred onto solid substrates at a desired surface pressure to form multilayered Langmuir-Blodgett films. Spectroscopic characterizations reveal some molecular level interactions as well as formation of microcrystalline aggregates depending upon the molar ratios of CTAB and RB within the complex LB films. Presence of two types of species in the complex LB films was confirmed by fluorescence spectroscopy.

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