Direct measurement of the dielectrophoresis forces acting on micro-objects using optical tweezers and a simple microfluidic chip
- Authors
- Park, In Soo; Park, Se Hee; Yoon, Dae Sung; Lee, Sang Woo; Kim, Beop-Min
- Issue Date
- 8-9월-2014
- Publisher
- AMER INST PHYSICS
- Citation
- APPLIED PHYSICS LETTERS, v.105, no.10
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED PHYSICS LETTERS
- Volume
- 105
- Number
- 10
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/97413
- DOI
- 10.1063/1.4895115
- ISSN
- 0003-6951
- Abstract
- We constructed a reliable frequency-dependent dielectrophoretic (DEP) force measurement system based on optical tweezers and a microfluidic chip. Using this system, we directly measured the frequency-dependent DEP forces acting on polystyrene beads while varying various parameters, which were all verified by theoretical simulations. We also investigated the DEP characteristics of non-functionalized and carboxyl-functionalized polystyrene beads in solutions with different conductivities by associating the measured crossover frequencies with a theoretical DEP model. This system can be used as a quantifying tool for surface conductance assays by characterizing the DEP forces acting on micro-objects in various experimental conditions. (C) 2014 AIP Publishing LLC.
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Collections - Graduate School > Department of Bioengineering > 1. Journal Articles
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