Direct measurement of electrostatic interactions between poly(methyl methacrylate) microspheres with optical laser tweezers
- Authors
- Choi, Kyu Hwan; Kang, Dong Woo; Kim, Kyung Hak; Kim, Jiwon; Lee, Youngbok; Im, Sang Hyuk; Park, Bum Jun
- Issue Date
- 28-10월-2019
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- SOFT MATTER, v.15, no.40, pp.8051 - 8058
- Indexed
- SCIE
SCOPUS
- Journal Title
- SOFT MATTER
- Volume
- 15
- Number
- 40
- Start Page
- 8051
- End Page
- 8058
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/62163
- DOI
- 10.1039/c9sm01374a
- ISSN
- 1744-683X
- Abstract
- In this study, we measured the force of electrostatic interactions between poly(methyl methacrylate) (PMMA) particles dispersed in organic solvent mixtures of cyclohexyl bromide (CHB) and n-decane. Optical laser tweezers were employed to directly measure interactive forces between paired PMMA particles in a CHB medium that contained n-decane in various volume ratios. CHB, having a moderate dielectric constant, provided an environment with a high charge storage capacity. The addition of n-decane lowered the effective refractive index of the medium, which increased the optical trapping efficiency. We also fabricated microscope flow cells with a commonly used UV-curable adhesive and quantified the effects of dissolved adhesive compounds through interactive force measurements and nuclear magnetic resonance analysis. In addition, we studied the impact of CHB dissociation into H+ and Br- ions, which could screen electrostatic interactions.
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Collections - College of Engineering > Department of Chemical and Biological Engineering > 1. Journal Articles
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