RT Journal Article
SR Electronic
T1 Self-assembled artificial cilia
JF Proceedings of the National Academy of Sciences
JO Proc Natl Acad Sci USA
FD National Academy of Sciences
SP 1844
OP 1847
DO 10.1073/pnas.0906819106
VO 107
IS 5
A1 Vilfan, Mojca
A1 Potočnik, Anton
A1 Kavčič, Blaž
A1 Osterman, Natan
A1 Poberaj, Igor
A1 Vilfan, Andrej
A1 Babič, Dušan
YR 2010
UL http://www.pnas.org/content/107/5/1844.abstract
AB Due to their small dimensions, microfluidic devices operate in the low Reynolds number regime. In this case, the hydrodynamics is governed by the viscosity rather than inertia and special elements have to be introduced into the system for mixing and pumping of fluids. Here we report on the realization of an effective pumping device that mimics a ciliated surface and imitates its motion to generate fluid flow. The artificial biomimetic cilia are constructed as long chains of spherical superparamagnetic particles, which self-assemble in an external magnetic field. Magnetic field is also used to actuate the cilia in a simple nonreciprocal manner, resulting in a fluid flow. We prove the concept by measuring the velocity of a cilia-pumped fluid as a function of height above the ciliated surface and investigate the influence of the beating asymmetry on the pumping performance. A numerical simulation was carried out that successfully reproduced the experimentally obtained data.