Article No.
Title : Polymer chemistry: Doughnut machine, Angew. Chem. Int.(Prof. Chang, Taihyun)

장태현 교수님 연구팀이 블록공중합체의 자기 조립 현상을 이용해 균일한 크기의 도넛모양 micelle을 만들고 이것을 나노 틀로 활용해 나노 금속입자를 제조할 수 있는 기술을 개발했다.

Nature 459, 143 (14 May 2009) | doi:10.1038/459143b; Published online 13 May 2009

Polymer chemistry: Doughnut machine
Angew. Chem. Int. Edn doi:10.1002/anie.200900533 (2009)

In solution, block copolymers — different types of synthetic polymer linked together -spontaneously cluster into a dazzling variety of shapes, including spheres, cylinders, discs and helices. Lately, even ring doughnuts (toroids) have been observed — but never alone, and always of varying size.

Taihyun Chang and his colleagues at Pohang University of Science and Technology in Korea have now hit on a recipe of copolymer and solvent that for the first time produces pure, almost uniform toroids — all about 70 nanometres in diameter and with a ring about 30 nanometres thick in cross-section. They are stable in solution for several months.

It is not clear how these doughnuts form; potential applications include use as templates for nanometre-scale patterning. For example, the researchers use them as a template to grow rings of gold nanoparticles around the doughnuts' edges.

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