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Direct measurement of electrostatic interactions between poly(methyl methacrylate) microspheres with optical laser tweezers

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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.

Graphical abstract: Direct measurement of electrostatic interactions between poly(methyl methacrylate) microspheres with optical laser tweezers

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Publication details

The article was received on 08 Jul 2019, accepted on 14 Sep 2019 and first published on 16 Sep 2019


Article type: Paper
DOI: 10.1039/C9SM01374A
Soft Matter, 2019, Advance Article

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    Direct measurement of electrostatic interactions between poly(methyl methacrylate) microspheres with optical laser tweezers

    K. H. Choi, D. W. Kang, K. H. Kim, J. Kim, Y. Lee, S. H. Im and B. J. Park, Soft Matter, 2019, Advance Article , DOI: 10.1039/C9SM01374A

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