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Volume 120, 2002
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Self-oscillating polymer chain in a laser field

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We have investigated the dynamical behaviour of the rhythmic conformational change between the folded compact state and the unfolded state in a single polymer chain under thermodynamically open conditions. It is shown that the spontaneous rhythmic change in the conformation of a single polymer chain (T4DNA, 166 kbp, contour length: 56 μm) is generated using a focused continuous wave (CW) Nd:YAG laser beam (wavelength λ = 1064 nm), where the focused laser beam plays a dual role, both trapping a polymer chain at the focus and creating a temperature gradient around the focus. Furthermore, the whole process of the rhythmic conformational change: the course of melting, nucleation and growth between the folded and unfolded states has been clarified. The rhythmic change in the conformation is discussed in terms of the limit-cycle oscillation driven by the dissipation of the photon energy.

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Article information

26 Jun 2001
First published
12 Nov 2001

Faraday Discuss., 2002,120, 67-84
Article type

Self-oscillating polymer chain in a laser field

H. Mayama and K. Yoshikawa, Faraday Discuss., 2002, 120, 67
DOI: 10.1039/B105573A

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