NDLI: Self-propelled drop movement by manipulation of nanoscale adsorbates through molecular self-assembly

Content Provider	IEEE Xplore Digital Library
Author	Jun Yang Mo, G. Seok-Won Lee Laibinis, P.E. Kwok, D.Y.
Copyright Year	2002
Description	Author affiliation: Dept. of Mech. Eng., Alberta Univ., Edmonton, Alta., Canada (Jun Yang; Mo, G.)
Abstract	We examined reactive wetting and transport phenomena of droplets on chemically patterned surfaces. We employed decahydronaphthalene (DHN) droplets that contained various amounts of an n-alkylamine to reactively wet and move about surfaces that expose a dense packing of carboxylic acid functionalities. The amine compounds adsorb onto this surface and produce one with a lower energy that exposes methyl groups, thereby causing a local surface energy gradient that is sufficient to induce a self-propelled movement of the contacting droplets on the surface. We employed patterning methods (micro-contact printing) to confine the direction of drop movement on these surfaces, thereby allowing direct measurement of fluidic movement and velocity. This ability allowed examination of the relationships between macroscopic droplet behavior and microscopic adsorption events. Specifically, we examined the effects of the force due to the unbalanced surface tension and of drop composition (adsorbate concentration) on the drop velocity, and analyzed these results using a thermodynamic approach.
Starting Page	373
Ending Page	376
File Size	373986
Page Count	4
File Format	PDF
ISBN	0780375386
DOI	10.1109/NANO.2002.1032268
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-08-28
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Self-assembly Gold Printing Silicon Substrates Chemical engineering Chemical technology Microscopy Fluid flow Mechanical engineering
Content Type	Text
Resource Type	Article

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