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Confinement and partitioning of a single polymer chain in a dense array of nanoposts

Title
Confinement and partitioning of a single polymer chain in a dense array of nanoposts
Authors
Joo, HeesunKim, Jun Soo
Ewha Authors
김준수
SCOPUS Author ID
김준수scopus
Issue Date
2015
Journal Title
SOFT MATTER
ISSN
1744-683XJCR Link1744-6848JCR Link
Citation
vol. 11, no. 42, pp. 8262 - 8272
Publisher
ROYAL SOC CHEMISTRY
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
We present a Brownian dynamics simulation study on the confinement and partitioning of a single, flexible polymer chain in a dense array of nanoposts with different sizes and separations, especially, when the volume of an interstitial space formed among four nanoposts is less than the volume of the polymer chain. As the interstitial volume decreases by either increasing the nanopost diameter or decreasing the separation between nanoposts, the chain conformation becomes elongated in the direction parallel to the nanoposts. Interestingly, however, the degree of chain elongation varies in a non-monotonic fashion as the interstitial volume decreases while keeping the passage width between two nanoposts constant at a small value. We calculate the free energy of chain partitioning over several interstitial spaces from the partitioning probability, and find that the non-monotonic dependence of the chain elongation results from an interplay between the confinement-driven chain elongation along the direction parallel to the nanoposts and the chain spreading perpendicular to the nanoposts by partitioning chain segments over several interstitial spaces. These results present the possibility of utilizing a dense array of nanoposts as a template to control polymer conformations.
DOI
10.1039/c5sm01585e
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자연과학대학 > 화학·나노과학전공 > Journal papers
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