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Zeta potential and electroosmotic mobility in microfluidic devices fabricated from hydrophobic polymers: 1. The origins of charge
Author(s) -
Tandon Vishal,
Bhagavatula Sharath K.,
Nelson Wyatt C.,
Kirby Brian J.
Publication year - 2008
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.200700734
Subject(s) - electrokinetic phenomena , hydrophobe , microfluidics , zeta potential , streaming current , polymer , context (archaeology) , chemical physics , materials science , hydrophobic effect , charge (physics) , adsorption , nanotechnology , chemical engineering , chemistry , organic chemistry , nanoparticle , composite material , physics , paleontology , engineering , biology , quantum mechanics
This paper combines new experimental data for electrokinetic characterization of hydrophobic polymers with a detailed discussion of the putative origins of charge at water‐hydrophobe interfaces. Complexities in determining the origin of charge are discussed in the context of design and modeling challenges for electrokinetic actuation in hydrophobic microfluidic devices with aqueous working fluids. Measurements of interfacial charge are complicated by slip and interfacial water structuring phenomena (see Part 2, this issue). Despite these complexities, it is shown that (i) several hydrophobic materials, such as Teflon and Zeonor, have predictable electrokinetic properties and (ii) electrokinetic data for hydrophobic microfluidic systems is most consistent with the postulate that hydroxyl ion adsorption is the origin of charge.