Change in the Layered Structure of Merocyanine Dye Langmuir-Blodgett Films due to N-Octadecane Addition
Change in the Layered Structure of Merocyanine Dye Langmuir-Blodgett Films due to N-Octadecane Addition
复制标题
添加正十八烷导致部花青染料 Langmuir-Blodgett 薄膜层状结构的变化
DOI：
10.1143/jjap.38.6024
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发表时间：
1999
影响因子：
1.5
通讯作者：
T. Ishii
中科院分区：
文献类型：
--
作者：
Y. Hirano;Kunihiko N. Kamata;Yudzou S. Inadzuki;J. Kawata;Y. Miura;M. Sugi;T. Ishii
采用表面压力(π) -面积(A)等温线和x射线衍射测量，研究了高、低C20含量merocyanine dye (MS)-arachidic acid （C20）二元体系和MS - C20-n-十八烷（AL18）三元体系（[MS]: [C20]:[AL18]= 1:2: x和1:5:x， 0≦x≦5.0）Langmuir-Blodgett （LB）薄膜的层状结构。π-A等温线测量表明，AL18倾向于填充质谱的空白空间；然而，即使AL18的混合比例较小，也会在质谱空间外发现一定量的AL18。在x≧3.0时，低、高C20三元单层膜的π-A等温线发生相变。低C20含量和高C20含量LB薄膜的x射线衍射谱图显示出2θ< 9°和9°< 2θ两种不同的模式。随着C20摩尔混合比的增加，控制2θ<9°x射线衍射图的双层单位细胞种类发生了变化。x射线衍射和π-A等温线测量表明，MS空腔中AL18的增加导致LB膜中2θ< 9°的间距增大。
The layered structure in Langmuir-Blodgett (LB) films of the merocyanine dye (MS)-arachidic acid (C20) binary system and the MS–C20-n-octadecane (AL18) ternary system with low and high C20 contents ([MS]: [C20]:[AL18]=1: 2: x and 1: 5: x, 0≦x≦5.0) has been studied by means of surface pressure (π)–area (A) isotherm and X-ray diffraction measurements. The π–A isotherm measurement indicates that AL18 tends to fill the empty space of MS; however, a certain amount of AL18 is found outside of the space of MS even for smaller mixing ratios of AL18. A phase transition is observed in the π–A isotherms of the ternary monolayers with low and high C20 contents for x≧3.0. Two different regimes can be recognized in the X-ray diffraction patterns of the LB films with low and high C20 contents: 2θ< 9° and 9° < 2θ. The bilayer unit-cell species governing the X-ray diffraction patterns for 2θ<9° changes with increasing molar mixing ratio of C20. X-ray diffraction and π–A isotherm measurements indicate that the increase in AL18 in the empty space of MS causes the expansion of the spacing estimated for 2θ< 9° in the LB films.