1. Visualization of hydration layers on muscovite mica in aqueous solution by frequency-modulation atomic force microscopy.
- Author
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Kobayashi, Kei, Oyabu, Noriaki, Kimura, Kenjiro, Ido, Shinichiro, Suzuki, Kazuhiro, Imai, Takashi, Tagami, Katsunori, Tsukada, Masaru, and Yamada, Hirofumi
- Subjects
HYDRATION ,MUSCOVITE ,AQUEOUS solutions ,ATOMIC force microscopy ,MATHEMATICAL mappings ,MOLECULAR dynamics ,HIGH resolution imaging - Abstract
A three-dimensional interaction force mapping experiment was carried out on a muscovite mica surface in an aqueous solution using a high-resolution and low-thermal drift frequency-modulation atomic force microscope. By collecting oscillatory frequency shift versus distance curves at the mica/solution interface, complicated hydration structures on the mica surface were visualized. Reconstructed two-dimensional frequency shift maps showed dot-like or honeycomb-like patterns at different tip-sample distances with a separation of 0.2 nm with each other, which agree well to the water molecule density maps predicted by a statistical-mechanical theory. Moreover, site-specific force versus distance curves showed a good agreement with theoretically calculated site-specific force curves by a molecular dynamics simulation. It is found that the first and second hydration layers give honeycomb-like and dot-like patterns in the two-dimensional frequency shift images, respectively, corresponding to the lateral distribution function in each layer. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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