Dynamic compression of single nanochannel confined DNA via a nanodozer assay

Ahmed Khorshid, Philip Zimny, David Tétreault-La Roche, Geremia Massarelli, Takahiro Sakaue, Walter Reisner

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


We show that a single DNA molecule confined and extended in a nanochannel can be dynamically compressed by sliding a permeable gasket at a fixed velocity relative to the stationary polymer. The gasket is realized experimentally by optically trapping a nanosphere inside a nanochannel. The trapped bead acts like a "nanodozer," directly applying compressive forces to the molecule without requirement of chemical attachment. Remarkably, these strongly nonequilibrium measurements can be quantified via a simple nonlinear convective-diffusion formalism and yield insights into the local blob statistics, allowing us to conclude that the compressed nanochannel-confined chain exhibits mean-field behavior.

Original languageEnglish
Article number268104
JournalPhysical review letters
Issue number26
Publication statusPublished - Dec 30 2014

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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