Alignment and self-assembly of elongated micronsize rods in several flow fields

E. Katz, Alexander Yarin, W. Salalha, E. Zussman

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Microfluidic alignment has attracted attention as a possible tool for the orientation of micronsize rods suspended in a solvent and the deposition of these rods in ordered arrays on solid surfaces. In the present work the following situations are realized experimentally: (i) a flow through an abruptly converging (or diverging) joint between wide and narrow straight channels which entrains and aligns (or misaligns) microrods and (ii) a tiny droplet of the order of a hundred microns that contains microrods is displaced due to Marangoni convection forces in a channel subjected to a temperature gradient. The flow near the advancing contact line orients the random suspension of rods and guides them towards the channel bottom where they are deposited in an ordered array. In parallel with this experimental study, the processes of microrod reorientation and alignment in the above-mentioned flows and in a similar sinklike flow into an issuing jet were studied using solutions of the Fokker-Planck equation for the orientation probability density function.

Original languageEnglish
Article number034313
JournalJournal of Applied Physics
Volume100
Issue number3
DOIs
Publication statusPublished - 2006 Aug 23
Externally publishedYes

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self assembly
flow distribution
rods
alignment
Marangoni convection
Fokker-Planck equation
probability density functions
solid surfaces
retraining
temperature gradients

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

Cite this

Alignment and self-assembly of elongated micronsize rods in several flow fields. / Katz, E.; Yarin, Alexander; Salalha, W.; Zussman, E.

In: Journal of Applied Physics, Vol. 100, No. 3, 034313, 23.08.2006.

Research output: Contribution to journalArticle

Katz, E. ; Yarin, Alexander ; Salalha, W. ; Zussman, E. / Alignment and self-assembly of elongated micronsize rods in several flow fields. In: Journal of Applied Physics. 2006 ; Vol. 100, No. 3.
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