Bormashenko Edward, Pogreb Roman, Bormashenko Yelena, Musin Albina, Stein Tamir
Ariel University Center of Samaria, The Research Institute, Ariel, Israel.
Langmuir. 2008 Nov 4;24(21):12119-22. doi: 10.1021/la802355y. Epub 2008 Oct 7.
The motion of ferrofluidic marbles on flat polymer substrates is reported. Nanopowders of polyvinylidene fluoride and gammaFe2O3 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.
报道了铁磁流体弹珠在平坦聚合物基底上的运动。聚偏二氟乙烯和γ-Fe₂O₃纳米粉末用于制备铁磁流体弹珠。这些弹珠很容易被外部磁场激活。描述了一种基于铁磁流体弹珠的微流体装置（铁磁流体轴承）。记录到弹珠的速度高达25±3厘米/秒。研究了铁磁流体液滴在超疏水表面上的滑动。结果表明，液滴位移所需的阈值磁力与液滴半径呈线性关系，因此液滴的运动仅由三线附近发生的过程决定。
