Open AccessNanostructured surfaces for microfluidics and sensing applications.
Author(s) -
S. T. Picraux,
Marcin Piech,
J.D. Schneider,
Sean Vail,
Mark A. Hayes,
Anthony Garcia,
Nelson S. Bell,
Devens Gust,
Dongqing Yang
Publication year - 2007
Language(s) - English
Resource type - Reports
DOI - 10.2172/902205
Subject(s) - azobenzene , microfluidics , monolayer , isomerization , materials science , surface tension , nanotechnology , contact angle , surface modification , surface energy , work (physics) , surface (topology) , chemistry , polymer , composite material , physics , organic chemistry , catalysis , geometry , mathematics , quantum mechanics , thermodynamics
The present work demonstrates the use of light to move liquids on a photoresponsive monolayer, providing a new method for delivering analyses in lab-on-chip environments for microfluidic systems. The light-driven motion of liquids was achieved on photoresponsive azobenzene modified surfaces. The surface energy components of azobenzene modified surfaces were calculated by Van Oss theory. The motion of the liquid was achieved by generation of a surface tension gradient by isomerization of azobenzene monolayers using UV and Visible light, thereby establishing a surface energy heterogeneity on the edge of the droplet. Contact angle measurements of various solvents were used to demonstrate the requirement for fluid motion
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