“Stick and slide” ferrofluidic droplets on superhydrophobic surfaces

The authors report the suspension and movement of ferrofluid droplets on superhydrophobic surfaces in the presence of strong external magnetic fields. The system allows the quantitative evaluation of friction between droplet and substrate surface. It represents an enabling example for the development of microferrofluidic devices and a breakthrough in the remote actuation of droplets on surfaces, which cannot be achieved using conventional microfluidics, or inkjet printing, electrowetting, or light-driven motion.

[1]  Jin Zhai,et al.  Creation of a superhydrophobic surface from an amphiphilic polymer. , 2003, Angewandte Chemie.

[2]  G McHale,et al.  Analysis of droplet evaporation on a superhydrophobic surface. , 2005, Langmuir : the ACS journal of surfaces and colloids.

[3]  Yang Cheng,et al.  Is the lotus leaf superhydrophobic , 2005 .

[4]  H W Li,et al.  Dewetting of conducting polymer inkjet droplets on patterned surfaces , 2004, Nature materials.

[5]  D. Cyranoski Chinese plan pins big hopes on small science , 2001, Nature.

[6]  Rustem F Ismagilov,et al.  A microfluidic approach for screening submicroliter volumes against multiple reagents by using preformed arrays of nanoliter plugs in a three-phase liquid/liquid/gas flow. , 2005, Angewandte Chemie.

[7]  G. Whitesides,et al.  Molecular self-assembly and nanochemistry: a chemical strategy for the synthesis of nanostructures. , 1991, Science.

[8]  J. Youngblood,et al.  Ultrahydrophobic polymer surfaces prepared by simultaneous ablation of polypropylene and sputtering of poly(tetrafluoroethylene) using radio frequency plasma , 1999 .

[9]  John A. Rogers,et al.  Dynamic tuning of optical waveguides with electrowetting pumps and recirculating fluid channels , 2002 .

[10]  Hao Zhang,et al.  A covalently attached film based on poly(methacrylic acid)-capped Fe3O4 nanoparticles , 2003 .

[11]  J. Storhoff,et al.  Selective colorimetric detection of polynucleotides based on the distance-dependent optical properties of gold nanoparticles. , 1997, Science.

[12]  Zhiguang Guo,et al.  Stable biomimetic super-hydrophobic engineering materials. , 2005, Journal of the American Chemical Society.

[13]  George C Schatz,et al.  What controls the melting properties of DNA-linked gold nanoparticle assemblies? , 2000, Journal of the American Chemical Society.

[14]  H. Fuchs,et al.  Nanoscopic channel lattices with controlled anisotropic wetting , 2000, Nature.

[15]  Akira Fujishima,et al.  Preparation of Transparent Superhydrophobic Boehmite and Silica Films by Sublimation of Aluminum Acetylacetonate , 1999 .