Browsing by Author "Lin, Chih-Ru"

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Interaction of two magnetic micro-chains in a rotating field
(2020-01-01)
Cheng, Jia-Hong
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Lin, Chih-Ru
;
Chen, Ching-Yao
;
機械工程學系
;
Department of Mechanical Engineering
Interactions between two chains consisted of micro-sized magnetic beads are experimentally investigated. Driven by a rotating field, three distinct modes of magnetic interactions are identified, referred to as chaining, locking and transit. The two chains gradually approach to form a longer chain in the chaining mode. The locking mode refers the chains undergo an interesting orbital-like circular motion, which mimics a binary star system. The chains could also evolve from locking to chaining in the transit mode. A necessary criterion for a locking mode is derived, which agrees excellently with the correspondent experiments.
Trajectory of a Non-Magnetic Particle Transported by a Rotating Magnetic Particle Chain
(2019-02-01)
Lo, Wen-Yuan
;
Lu, Chun-Yi
;
Lin, Chih-Ru
;
Chen, Ching-Yao
;
機械工程學系
Transportation of microscale subject is important in the MEMS application. In this paper, movement of a non-magnetic particle driven by a chain consisted of several magnetic particles in a rotational field is experimentally manipulated and observed. The results reveal two distinct motion behaviors of the non-magnetic particle depending on its initial position. For an "outer" particle, whose initial position is at the edge of gyration region, the angular movement is most significant at the timing when contacting with the chain. The net rotating angle of an outer particle per contact remains nearly constant regardless of the length of the rotating chain. Nevertheless, interaction with an "inner" particle, whose initial position is well covered by the gyration, would cause the chain drifting, so that its radial distance to the rotational origin varies continuously. As a result, the overall movement of an inner particle follows a spiral-like trajectory with varying radius in each cycle. Based on the experimental measures, a kinematic model is developed, which enables to numerically predict the trajectory of a non-magnetic particle.