Superlattice formation in a binary mixture of block copolymer micelles
Superlattice formation in a binary mixture of block copolymer micelles
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DOI：
10.1103/physrevlett.97.097803
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发表时间：
2006-09-01
影响因子：
8.6
通讯作者：
Lodge, Timothy P.
中科院分区：
文献类型：
--
作者：
Abbas, Sayeed;Lodge, Timothy P.
发现不同嵌段共聚物胶束的二元溶液混合物采用超晶格。较大的胶束由聚苯乙烯-聚异戊二烯二嵌段形成，标称半径为 29 nm；较小的胶束由聚苯乙烯-聚二甲基硅氧烷二嵌段形成，标称半径为 16 nm。超晶格晶胞尺寸为 156 nm，归属于 barc 上的空间群 Fm (3)；它对应于AB(13)结构。由于这些二嵌段不带电，超晶格形成的驱动力主要是自由体积熵，就像在空间稳定的胶体硬球中一样。
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.