New investigations on ferrofluidics: Ferrofluidic marbles and magnetic-field-driven drops on superhydrophobic surfaces

Edward Bormashenko, Roman Pogreb, Yelena Bormashenko, Albina Musin, Tamir Stein

Research output: Contribution to journalArticlepeer-review

192 Scopus citations

Abstract

The motion of ferrofluidic marbles on flat polymer substrates is reported. Nanopowders of poly vinylidene fluoride and γFe2O3 were used for the preparation of ferrofluidic marbles. The marbles are activated easily with an external magnetic field. A microfluidic device based on ferrofluidic marbles (the ferrofluidic bearing) is described. Velocities of marbles as high as 25 ± 3 cm/s were registered. The sliding of ferrofluidic drops on superhydrophobic surfaces was studied. It was demonstrated that the threshold magnetic force necessary for the drop displacement depends linearly on the drop radius, thus the motion of the drop is defined by the processes occurring in the vicinity of the triple line only.

Original languageEnglish
Pages (from-to)12119-12122
Number of pages4
JournalLangmuir
Volume24
Issue number21
DOIs
StatePublished - 4 Nov 2008

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