Jump to main content
Jump to site search

Issue 19, 2014
Previous Article Next Article

Controlled splitting and focusing of a stream of nanoparticles in a converging–diverging microchannel

Author affiliations

Abstract

We demonstrate the potential of a converging–diverging microchannel to split a stream of nanoparticles towards the interfacial region of the dispersed and the carrier phases, introduced through the middle inlet and through the remaining two inlets respectively, while maintaining a low Reynolds number limit (<10) for the flow of both phases. In addition to the splitting of passive tracer particles, such as polystyrene beads as used herein, the present setup has the potential to be utilized for a controlled reaction and thereby the separation of products towards an intended location, as observed from the experimentation with silver-nanoparticles and hydrogen–peroxide solution. Moreover, the microscale dimension of the channel allows controlled deposition of the reaction product over the bottom surface of the channel, allowing the possibility of bottom-up fabrication of microscale features. We unveil the underlying hydrodynamics that lead to such behaviours through numerical simulations, which are consistent with the experimental observations. The phenomenological features are found to be guided by the splitting of the intrinsic streamlines conforming to the flow geometry under consideration.

Graphical abstract: Controlled splitting and focusing of a stream of nanoparticles in a converging–diverging microchannel

Back to tab navigation

Supplementary files

Publication details

The article was received on 08 May 2014, accepted on 14 Jul 2014 and first published on 08 Aug 2014


Article type: Paper
DOI: 10.1039/C4LC00542B
Lab Chip, 2014,14, 3800-3808

  •   Request permissions

    Controlled splitting and focusing of a stream of nanoparticles in a converging–diverging microchannel

    R. K. Arun, K. Chaudhury, M. Ghosh, G. Biswas, N. Chanda and S. Chakraborty, Lab Chip, 2014, 14, 3800
    DOI: 10.1039/C4LC00542B

Search articles by author

Spotlight

Advertisements