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Bolaform Amphiphiles 1.Surface Properties and Micelle

ZHAO Xiao-li HUANG Jian-bin LI Zi-chen ZHU Bu-yao (Institute of Chemistry,Peking University, Beijing 100871,China)  
s:Hydrophobic chain connecting two hydrophilic groups makes up a "bolaform amphiphile",which often shows two breaks in its surface tension curve.Bolaform amphiphiles form premicelle with low aggregation number at low concentration corresponding to the first break in the surface tension curve,and form loose micelle at higher concentration corresponding to the second break.In the air-water interface bolaform amphiphiles bend into U-shape,and in the micelle the hydrophobic chain of bolaform amphiphile is folded if the chain is long enough.
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