Unique phase-separation structures of block-copolymer nanoparticles

Hiroshi Yabu, Takeshi Higuchi, Masatsugu Shimomura

Research output: Contribution to journalArticlepeer-review

160 Citations (Scopus)


A simple method to prepare block-copolymer nanoparticles and their unique phase-separation structures, were analyzed. The aqueous suspensions of nanoparticles of the block copolymers were prepared from their tetrahydrofuran (THF) solutions. The nanoparticles of the block copolymers can also be prepared by the conventional reprecipitation method. It is observed that THF gradually evaporates from the solution surface, and then a solvent gradient was formed from the bottom to the top of the solution. By this exposure to solvent, the well-developed microphase separation occurred in the block-copolymer nanoparticles. The results show that block copolymers formed a well-developed lamellar structure in the nanoparticles.

Original languageEnglish
Pages (from-to)2062-2065
Number of pages4
JournalAdvanced Materials
Issue number17
Publication statusPublished - 2005 Sept 5


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