物理化学学报 >> 1997, Vol. 13 >> Issue (12): 1072-1078.doi: 10.3866/PKU.WHXB19971204

研究论文 上一篇    下一篇

双分子膜上染料的吸附性质及对膜结构的影响

魏君华,吴立新,吴英,李国文   

  1. 吉林大学超分子结构与谱学开放实验室，长春 130023
  • 收稿日期:1997-02-21 修回日期:1997-05-14 发布日期:1997-12-15
  • 通讯作者: 吴立新

Adsorption,Aggregation of Dye Anions on the Surface of Aqueous Vesicle Bilayer and their Influence on Membrane Structure

Wen Jun-Hua,Wu Li-Xin,Wu Ying,Li Guo-Wen   

  1. Key Laboratory for Supramolecular Structure Spectroscopy,Jilin University,Changchun 130023
  • Received:1997-02-21 Revised:1997-05-14 Published:1997-12-15
  • Contact: Wu Li-Xin

PDF

2623

赞

摘要：

系统地研究了染料甲基橙（MO）和达旦黄（TY）则在含席夫碱基囊泡双分子膜阳离子表面上的吸附和聚集，以及由此产生的对膜聚集结构的影响. 染料的吸附和聚集可经电子吸收光谱和因吸附产生的沉淀证实，并且MO的聚集结构为H-聚集，TY的聚集结构为J-聚集. 改变pH的研究表明MO在变色pH值以下因形成阳离子而解聚，TY在酸性条件下亦因离子化程度减弱和部分质子化而使聚集被削弱，但在碱性条件下其聚集产生更大的红移. 温度变化的结果显示染料的聚集因囊泡聚集态的改变而逐步解聚. 示差扫描量热（DSC）和差减的吸收光谱得出染料的吸附和聚集减弱了囊泡双分子膜的聚集相互作用并导致相变温度降低.

关键词: 染料, 囊泡双分子膜, 聚集;吸附

Abstract:

Adsorption, aggregation and membrane structure of dye anions such as methyl orange(MO) and titan yellow(TY) on the cationic surface of vesicle bilayers containing schiff base were studied systemetically. The adsorption and aggregation were revealed through the wavelength shift of absorption maxinmm and precipitation produced in bianery mixture. Blue shift and red shift showed that the aggregate structure was H-aggregate for MO and J-aggregation for TY respectively. pH dependences of dyes in mixture systems indicated that the MO aggregates formed at high pH would be destroyed under low pH, which resulted from the cationic structure formation. TY aggregates were also disaggregated in considerable scale at low pH because of partial protonation, but strong red shift occurred at high pH. With temperature increasing, the aggregation of dyes would gradually be disintegrated following the change states of vesicle bilayer from gel to liquid crystal and finally to molecular dispersion. Differential Scanning Calorimetry(DSC) showed that the adsorption of dyes an action to decrease the phase transition temperature of vesicle and the differential spectra confirmed that the aggregate interaction of vesicle bilayer was weakened. 

Key words: Dye, Vesicle bilayer, Aggregation and absorption