Superlattice formation in a binary mixture of block copolymer micelles

被引:26
作者
Abbas, Sayeed
Lodge, Timothy P.
机构
[1] Univ Minnesota, Dept Chem, Minneapolis, MN 55455 USA
[2] Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA
关键词
D O I
10.1103/PhysRevLett.97.097803
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
A binary solution mixture of distinct block copolymer micelles is found to adopt a superlattice. The larger micelles, formed from polystyrene-polyisoprene diblocks, have a nominal radius of 29 nm; the smaller micelles, formed from polystyrene-polydimethylsiloxane diblocks, have a nominal radius of 16 nm. The superlattice unit cell dimension is 156 nm and is assigned to space group Fm (3) over barc; it corresponds to the AB(13) structure. As these diblocks are uncharged, the driving force for superlattice formation is primarily free volume entropy, as in sterically stabilized colloidal hard spheres.
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页数:4
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