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Magnetically Characterized Molecular Lubrication between Biofunctionalized Surfaces

Title
Magnetically Characterized Molecular Lubrication between Biofunctionalized Surfaces
Authors
Hu, XinghaoRamulu, Torati SriYoon, Jong HwanLim, Byeong HwaKim, Kun WooKim, Cheol Gi
DGIST Authors
Ramulu, Torati Sri; Kim, Cheol Gi
Issue Date
2018-05
Citation
ACS Applied Materials and Interfaces, 10(18), 16177-16182
Type
Article
Article Type
Article
Keywords
FrictionMagnetic fieldsMagnetsProteinsSilicaTribologybio-funtionalizationCritical frequenciesFriction coefficientsFunctionalized surfacesMechanical interactionsMicromagnetsSimultaneous measurementSuperparamagnetic particlesMagnetic bubbles
ISSN
1944-8244
Abstract
We demonstrate an efficient approach for quantifying frictional forces (sub-piconewton) at nano-bio interfaces by controlled magnetic forces, which is based on simultaneous measurements of critical frequencies for streptavidin-coupled magnetic particles. The maximum phase angle, being corresponded with the critical frequency, is formulated in terms of magnetic, frictional, and viscous forces of the particles on DNA- and SiO2-functionalized micromagnet arrays. The streptavidin/DNA interface shows lower friction as an enhanced lubrication than the streptavidin/SiO2 interface, which is indicated by the lower transition field of quasi-static motion, the larger ratio of dynamic particles, and also the higher velocity of the particles. The friction coefficients at the streptavidin/DNA and streptavidin/SiO2 interfaces are evaluated numerically as 0.07 and 0.11, respectively, regardless of the vertical force and the velocity. The proposed method would open up new possibilities to study mechanical interactions at biological surfaces. © 2018 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/6392
DOI
10.1021/acsami.8b00903
Publisher
American Chemical Society
Related Researcher
  • Author Kim, CheolGi 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
Department of Emerging Materials ScienceETC1. Journal Articles


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