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Magnetically Characterized Molecular Lubrication between Biofunctionalized Surfaces
- Magnetically Characterized Molecular Lubrication between Biofunctionalized Surfaces
- Hu, Xinghao; Ramulu, Torati Sri; Yoon, Jong Hwan; Lim, Byeong Hwa; Kim, Kun Woo; Kim, Cheol Gi
- DGIST Authors
- Ramulu, Torati Sri; Kim, Cheol Gi
- Issue Date
- ACS Applied Materials and Interfaces, 10(18), 16177-16182
- Article Type
- Friction; Magnetic fields; Magnets; Proteins; Silica; Tribology; bio-funtionalization; Critical frequencies; Friction coefficients; Functionalized surfaces; Mechanical interactions; Micromagnets; Simultaneous measurement; Superparamagnetic particles; Magnetic bubbles
- 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.
- American Chemical Society
- Related Researcher
Lab for NanoBio-MatErials & SpinTronics(nBEST)
Magnetic Materials and Spintronics; Converging Technology of Nanomaterials and Biomaterials; Bio-NEMS;MEMS
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- Department of Emerging Materials ScienceLab for NanoBio-Materials & SpinTronics(nBEST)1. Journal Articles
Department of Emerging Materials ScienceETC1. Journal Articles
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