Electrowetting Actuated Microfluidic Transport in
Surface Grooves with Triangular Cross Section
Jitesh Barman
Digendranath Swain
Bruce
M. Law
Ralf Seemann
Stephan Herminghaus
Krishnacharya Khare
10.1021/la504354a.s001
https://acs.figshare.com/articles/journal_contribution/Electrowetting_Actuated_Microfluidic_Transport_in_Surface_Grooves_with_Triangular_Cross_Section/2212705
Liquids show different static wetting
morphologies in open triangular
grooves depending upon the wedge angle (ψ) of the groove and
the liquid contact angle (θ) with the substrate. Switching between
different morphologies can be achieved either by varying the contact
angle of the liquid or by changing the wedge angle of the groove.
In the present work we manipulate the apparent contact angle of a
liquid by electrowetting to switch between liquid morphologies, from
droplet to filament, to achieve microfluidic transport of the liquid
into open triangular grooves. The static length of liquid filaments
in grooves is analyzed as a function of applied voltage for different
applied ac frequencies. The dynamic advancement of the filament lengths
in grooves is analyzed as a function of time for different applied
voltages for two different liquids: first with contact angle greater
than the wedge angle and second with contact angle smaller than the
wedge angle. Later an exact electrical model is derived to explain
the liquid transport in triangular grooves actuated by electrowetting
which includes the precise geometry of the liquid morphology.
2015-01-27 00:00:00
wedge angle
contact angle
Electrowetting Actuated Microfluidic Transport
Triangular Cross SectionLiquids show
groove