Moving-wall-driven flows in nanofluidic systems

Roger Karlsson, Mattias Karlsson, Anders Karlsson, Ann Sofie Cans, Johan Bergenholtz, Björn Åkerman, Andrew G. Ewing, Marina Voinova, Owe Orwar

Research output: Contribution to journalArticlepeer-review

Abstract

We describe fluidic control in lipid nanotubes 50-150 nm in radius, conjugated with surface-immobilized unilamellar lipid bilayer vesicles (∼5-25 μm in diameter). Transport in nanotubes was induced by continuously increasing the surface tension of one of the conjugated vesicles, for example, by ellipsoidal shape deformation using a pair of carbon microfibers controlled by micromanipulators as tweezers. The shape deformation resulted in a flow of membrane lipids toward the vesicle with the higher membrane tension; this lipid flow in turn moved the liquid column inside the nanotube through viscous coupling. Thus, micrometer-sized vesicles are used as a handle for controlling fluid flow inside nanometer-sized channels. We show transport and trapping of a single 30-mn-diameter carboxylate-modified latex particle inside a ∼100-nm-radius nanotube. Fluidic control in nanometer-sized channels using a moving wall provides pluglike liquid flows, offers a means for efficient routing and trapping of small molecules, polymers, and colloids, and offers new opportunities to study chemistry in confined spaces. Networks of nanotubes and vesicles might serve as a platform to build nanofluidic devices operating with single molecules and nanoparticles.

Original languageEnglish (US)
Pages (from-to)4186-4190
Number of pages5
JournalLangmuir
Volume18
Issue number11
DOIs
StatePublished - May 28 2002

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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