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Study on the Behavior of the Mixed Monolayer of Arachidic Acid and Cerium 2,2,6,6-tetramethylheptanedionate
Zou Gang,Fang Kun,He Pingsheng*
Author NameAffiliationE-mail
Zou Gang Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026  
Fang Kun Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026  
He Pingsheng* Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026 hpsm@ustc.edu.cn 
Abstract:
The arachidic acids with Cerium 2,2,6,6-tetramethylheptanedionate were mixed at different ratios in chloroform solution and spread it onto pure water. The π-Aisotherm and the excess free energy of the mixed monolayer were studied. The miscibility, the molecular interaction of the two components and the probable condensed structure of the mixed monolayer were studied. It is found out that the Cerium 2,2,6,6-tetramethylheptanedionate/arachidic acid molar proportion of 1∶2 is the best for the formation of the stable mixed monolayer. The static elasticity and the dynamic elasticity of the mixed monolayer was also studied. It is found out that the interaction between the AA and the Ce(tmhd)4is significantly stronger and two AA molecules and one Ce(tmhd)4 molecule have formed agroup at a low surface pressure. Therefore the molecular arrangement is much closer and the mixed monolayer do not exist in the liquid state. The static elasticity and the dynamic elasticity of mixed monolayer are both enhanced especially at the low surface pressure.
Key words:  Monolayer, Arachidic acid, Cerium IV 2,2,6,6-tetramethylheptanedionate, Static elasticity, Dynamic
FundProject:国家自然科学基金资助项目(29974028).
花生酸与铈β-二酮络合物混合单分子膜的成膜特性
邹纲,方堃,何平笙*
摘要:
将铈β-二酮络合物(Ce(tmhd)4)的氯仿溶液与花生酸(AA)的氯仿溶液以不同摩尔比混合并铺展在纯水亚相上,得到其与AA的混合单分子膜.对混合单分子膜的成膜特性(π-A等温线和体系超额自由能)进行了探讨,发现混合单分子膜的超额自由能为负值,混合过程为热力学自发过程,且在配比为1∶ 2时其绝对值最大,体系最稳定,并进一步讨论了混合单分子膜可能的凝聚态结构.在配比为1∶ 2时,研究了混合单分子膜的静态弹性和动态弹性.
关键词:  单分子膜  花生酸  铈β-二酮络合物  静态弹性  动态弹性
DOI:10.1088/1674-0068/16/3/227-231
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