Continuous-flow sheathless diamagnetic particle separation in ferrofluids

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:412

Article

Zhou, Yilong¹  Song, Le²  Yu, Liandong²  Xuan, Xiangchun¹ 

[1] Clemson Univ, Dept Mech Engn, Clemson, SC 29634 USA

[2] Hefei Univ Technol, Sch Instrument Sci & Optoelect Engn, Hefei 230009, Peoples R China

关键词: Ferrofluid;    Diamagnetic particle separation;    Magnetophoresis;    Microfluidics;   

DOI  :  10.1016/j.jmmm.2016.04.001

来源: Elsevier

【 摘 要 】

Separating particles from a complex mixture is often necessary in many chemical and biomedical applications. This work presents a continuous-flow sheathless diamagnetic particle separation in ferrofluids through U-shaped microchannels. Due to the action of a size-dependent magnetic force, diamagnetic particles are focused into a single stream in the inlet branch of the U-turn and then continuously separated into two streams in its outlet branch. A 3D numerical model is developed to predict and understand the diamagnetic particle transport during this separation process. The numerical predictions are found to agree well with the experimental observations in a systematic study of the effects of multiple parameters including ferrofluid flow rate, concentration and magnet-channel distance. Additional numerical studies of the geometric effects of the U-turn reveal that increasing the outlet-branch width of the U-turn can significantly enhance the diamagnetic particle separation in ferrofluids. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

Free