DOI: 10.1063/1.4863346. Molecular-scale investigations of structures and surface charge distribution of surfactant aggregates by three-dimensional force mapping

Molecular-scale investigations of structures and surface charge distribution of surfactant aggregates by three-dimensional force mapping

10.1063/1.4863346

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

Surface charges on nanoscale structures in liquids, such as biomolecules and nano-micelles, play an essentially important role in their structural stability as well as their chemical activities. These structures interact with each other through electric double layers (EDLs) formed by the counter ions in electrolyte solution. Although static-mode atomic force microscopy (AFM) including colloidal-probe AFM is a powerful technique for surface charge density measurements and EDL analysis on a submicron scale in liquids, precise surface charge density analysis with single-nanometer resolution has not been made because of its limitation of the resolution and the detection sensitivity. Here we demonstrate molecular-scale surface charge measurements of self-assembled micellar structures, molecular hemicylinders of sodium dodecyl sulfate (SDS), by three-dimensional (3D) force mapping based on frequency modulation AFM. The SDS hemicylindrical structures with a diameter of 4.8 nm on a graphite surface were clearly imaged. We have succeeded in visualizing 3D EDL forces on the SDS hemicylinder surfaces and obtaining the molecular-scale charge density for the first time. The results showed that the surface charge on the trench regions between the hemicylinders was much smaller than that on the hemicylinder tops. The method can be applied to a wide variety of local charge distribution studies, such as spatial charge variation on a single protein molecule.

Bibliography

Suzuki, K., Kobayashi, K., Oyabu, N., Matsushige, K., & Yamada, H. (2014). Molecular-scale investigations of structures and surface charge distribution of surfactant aggregates by three-dimensional force mapping. The Journal of Chemical Physics, 140(5).

Authors 5

Kazuhiro Suzuki (first)
Kei Kobayashi (additional)
Noriaki Oyabu (additional)
Kazumi Matsushige (additional)
Hirofumi Yamada (additional)

References 45 Referenced 24

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See supplementary material at http://dx.doi.org/10.1063/1.4863346, including a movie of the 3D Δf map of SDS hemicylinders, solvation force of 1-undecanol, having a similar structure to SDS, and the calculation detail for the EDL force map using the single-layer potential method.
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10.1021/j100295a049 / J. Phys. Chem. (1987)
10.1016/0009-2614(94)00458-7 / Chem. Phys. Lett. (1994)

Dates

Type	When
Created	11 years, 6 months ago (Feb. 5, 2014, 10:17 a.m.)
Deposited	2 years, 2 months ago (June 19, 2023, 5:31 p.m.)
Indexed	3 weeks, 4 days ago (July 30, 2025, 7:02 a.m.)
Issued	11 years, 6 months ago (Feb. 4, 2014)
Published	11 years, 6 months ago (Feb. 4, 2014)
Published Online	11 years, 6 months ago (Feb. 4, 2014)
Published Print	11 years, 6 months ago (Feb. 7, 2014)

Funders 0

None

BibTeX

@article{Suzuki_2014, title={Molecular-scale investigations of structures and surface charge distribution of surfactant aggregates by three-dimensional force mapping}, volume={140}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.4863346}, DOI={10.1063/1.4863346}, number={5}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Suzuki, Kazuhiro and Kobayashi, Kei and Oyabu, Noriaki and Matsushige, Kazumi and Yamada, Hirofumi}, year={2014}, month=feb }

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