Computational study of band-crossing reactions

Alain Matta*, Omar M. Knio, Roger G. Ghanem, Chua Hua Chen, Juan G. Santiago, Bert Debusschere, Habib N. Najm

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


A numerical study of band-crossing reactions is conducted using a quasi-one-dimensional (1-D) computational model that accounts for species bulk advection, electromigration velocities, diffusion, and chemical reaction. The model is used to simulate chemical reactions between two initially distinct sample zones, referred to as "bands," that cross each other due to differences in electromigration velocities. The reaction is described in terms of a single step, reversible mechanism involving two reactants and one product. A parametric study is first conducted of the behavior of the species profiles, and results are interpreted in terms of the Damköhler number and of the ratios of the electromigration velocities of the reactant and product. Computed results are then used to explore the possibility of extracting forward and backward reaction rates based on time resolved observation of integral moments of species concentrations. In particular, it is shown that in the case of fast reactions, robust estimates can be obtained for high forward rates, but that small reverse rates may not be accurately observed.

Original languageEnglish (US)
Pages (from-to)310-322
Number of pages13
JournalJournal of Microelectromechanical Systems
Issue number2
StatePublished - Apr 2004
Externally publishedYes


  • Binding kinetics
  • Electrochemical processes
  • Electropheretic band crossing
  • Microfluidics
  • On-chip analysis

ASJC Scopus subject areas

  • Mechanical Engineering
  • Electrical and Electronic Engineering


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