Cited 5 time in webofscience Cited 6 time in scopus

An on-chip micromagnet frictionometer based on magnetically driven colloids for nano-bio interfaces

Title
An on-chip micromagnet frictionometer based on magnetically driven colloids for nano-bio interfaces
Authors
Hu, XinghaoGoudu, Sandhya RaniTorati, Sri RamuluLim, ByeonghwaKim, KunwooKim, CheolGi
DGIST Authors
Kim, CheolGi
Issue Date
2016
Citation
Lab on a Chip: Miniaturisation for Chemistry and Biology, 16(18), 3485-3492
Type
Article
Article Type
Article
ISSN
1473-0197
Abstract
A novel method based on remotely controlled magnetic forces of bio-functionalized superparamagnetic colloids using micromagnet arrays was devised to measure frictional force at the sub-picoNewton (pN) scale for bio-nano-/micro-electromechanical system (bio-NEMS/MEMS) interfaces in liquid. The circumferential motion of the colloids with phase-locked angles around the periphery of the micromagnets under an in-plane rotating magnetic field was governed by a balance between tangential magnetic force and drag force, which consists of viscous and frictional forces. A model correlating the phase-locked angles of the steady colloid rotation was formulated and validated by measuring the angles under controlled magnetic forces. Hence, the frictional forces on the streptavidin/Teflon interface between the colloids and the micromagnet arrays were obtained using the magnetic forces at the phase-locked angles. The friction coefficient for the streptavidin/Teflon interface was estimated to be approximately 0.036 regardless of both vertical force in the range of a few hundred pN and velocity in the range of a few tenths of μm s-1. © The Royal Society of Chemistry 2016.
URI
http://hdl.handle.net/20.500.11750/5148
DOI
10.1039/c6lc00666c
Publisher
Royal Society of Chemistry
Related Researcher
  • Author Kim, Cheol Gi Lab for NanoBio-MatErials & SpinTronics(nBEST)
  • Research Interests Magnetic Materials and Spintronics; Converging Technology of Nanomaterials and Biomaterials; Bio-NEMS;MEMS
Files:
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Collection:
Department of Emerging Materials ScienceLab for NanoBio-Materials & SpinTronics(nBEST)1. Journal Articles


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