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Hirofumi Yamada - One of the best experts on this subject based on the ideXlab platform.

  • accurate formula for dissipative interaction in frequency modulation atomic force microscopy
    Applied Physics Letters, 2014
    Co-Authors: K Suzuki, Kei Kobayashi, Kazumi Matsushige, Aleksander Labuda, Hirofumi Yamada
    Abstract:

    Much interest has recently focused on the viscosity of nano-confined liquids. Frequency modulation atomic force microscopy (FM-AFM) is a powerful technique that can detect variations in the conservative and dissipative forces between a nanometer-scale tip and a sample Surface. We now present an accurate formula to convert the dissipation power of the cantilever measured during the experiment to damping of the tip-sample system. We demonstrated the conversion of the dissipation power versus tip-sample separation curve measured using a colloidal probe cantilever on a Mica Surface in water to the damping curve, which showed a good agreement with the theoretical curve. Moreover, we obtained the damping curve from the dissipation power curve measured on the hydration layers on the Mica Surface using a nanometer-scale tip, demonstrating that the formula allows us to quantitatively measure the viscosity of a nano-confined liquid using FM-AFM.

  • visualization of hydration layers on muscovite Mica in aqueous solution by frequency modulation atomic force microscopy
    Journal of Chemical Physics, 2013
    Co-Authors: Kei Kobayashi, Noriaki Oyabu, K Suzuki, Kenjiro Kimura, Shinichiro Ido, Takashi Imai, Katsunori Tagami, Masaru Tsukada, Hirofumi Yamada
    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.

  • atomic resolution imaging of graphite water interface by frequency modulation atomic force microscopy
    Applied Physics Express, 2011
    Co-Authors: K Suzuki, Noriaki Oyabu, Kei Kobayashi, Kazumi Matsushige, Hirofumi Yamada
    Abstract:

    Atomic-resolution images of a graphite (0001) Surface in water were successfully obtained by frequency modulation atomic force microscopy. Atomic scale features with a periodicity of 0.25 nm were resolved with an interaction force of less than 100 pN using a stiff cantilever and a very small oscillation amplitude of 0.11 nm (0.21 nm peak-to-peak). Furthermore, structured-water layers on a hydrophobic graphite Surface were visualized by two-dimensional frequency shift mapping. The results were compared with a molecular-scale hydration structure at an interface between a hydrophilic Mica Surface and water.

K Suzuki - One of the best experts on this subject based on the ideXlab platform.

  • accurate formula for dissipative interaction in frequency modulation atomic force microscopy
    Applied Physics Letters, 2014
    Co-Authors: K Suzuki, Kei Kobayashi, Kazumi Matsushige, Aleksander Labuda, Hirofumi Yamada
    Abstract:

    Much interest has recently focused on the viscosity of nano-confined liquids. Frequency modulation atomic force microscopy (FM-AFM) is a powerful technique that can detect variations in the conservative and dissipative forces between a nanometer-scale tip and a sample Surface. We now present an accurate formula to convert the dissipation power of the cantilever measured during the experiment to damping of the tip-sample system. We demonstrated the conversion of the dissipation power versus tip-sample separation curve measured using a colloidal probe cantilever on a Mica Surface in water to the damping curve, which showed a good agreement with the theoretical curve. Moreover, we obtained the damping curve from the dissipation power curve measured on the hydration layers on the Mica Surface using a nanometer-scale tip, demonstrating that the formula allows us to quantitatively measure the viscosity of a nano-confined liquid using FM-AFM.

  • visualization of hydration layers on muscovite Mica in aqueous solution by frequency modulation atomic force microscopy
    Journal of Chemical Physics, 2013
    Co-Authors: Kei Kobayashi, Noriaki Oyabu, K Suzuki, Kenjiro Kimura, Shinichiro Ido, Takashi Imai, Katsunori Tagami, Masaru Tsukada, Hirofumi Yamada
    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.

  • atomic resolution imaging of graphite water interface by frequency modulation atomic force microscopy
    Applied Physics Express, 2011
    Co-Authors: K Suzuki, Noriaki Oyabu, Kei Kobayashi, Kazumi Matsushige, Hirofumi Yamada
    Abstract:

    Atomic-resolution images of a graphite (0001) Surface in water were successfully obtained by frequency modulation atomic force microscopy. Atomic scale features with a periodicity of 0.25 nm were resolved with an interaction force of less than 100 pN using a stiff cantilever and a very small oscillation amplitude of 0.11 nm (0.21 nm peak-to-peak). Furthermore, structured-water layers on a hydrophobic graphite Surface were visualized by two-dimensional frequency shift mapping. The results were compared with a molecular-scale hydration structure at an interface between a hydrophilic Mica Surface and water.

Kei Kobayashi - One of the best experts on this subject based on the ideXlab platform.

  • accurate formula for dissipative interaction in frequency modulation atomic force microscopy
    Applied Physics Letters, 2014
    Co-Authors: K Suzuki, Kei Kobayashi, Kazumi Matsushige, Aleksander Labuda, Hirofumi Yamada
    Abstract:

    Much interest has recently focused on the viscosity of nano-confined liquids. Frequency modulation atomic force microscopy (FM-AFM) is a powerful technique that can detect variations in the conservative and dissipative forces between a nanometer-scale tip and a sample Surface. We now present an accurate formula to convert the dissipation power of the cantilever measured during the experiment to damping of the tip-sample system. We demonstrated the conversion of the dissipation power versus tip-sample separation curve measured using a colloidal probe cantilever on a Mica Surface in water to the damping curve, which showed a good agreement with the theoretical curve. Moreover, we obtained the damping curve from the dissipation power curve measured on the hydration layers on the Mica Surface using a nanometer-scale tip, demonstrating that the formula allows us to quantitatively measure the viscosity of a nano-confined liquid using FM-AFM.

  • visualization of hydration layers on muscovite Mica in aqueous solution by frequency modulation atomic force microscopy
    Journal of Chemical Physics, 2013
    Co-Authors: Kei Kobayashi, Noriaki Oyabu, K Suzuki, Kenjiro Kimura, Shinichiro Ido, Takashi Imai, Katsunori Tagami, Masaru Tsukada, Hirofumi Yamada
    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.

  • atomic resolution imaging of graphite water interface by frequency modulation atomic force microscopy
    Applied Physics Express, 2011
    Co-Authors: K Suzuki, Noriaki Oyabu, Kei Kobayashi, Kazumi Matsushige, Hirofumi Yamada
    Abstract:

    Atomic-resolution images of a graphite (0001) Surface in water were successfully obtained by frequency modulation atomic force microscopy. Atomic scale features with a periodicity of 0.25 nm were resolved with an interaction force of less than 100 pN using a stiff cantilever and a very small oscillation amplitude of 0.11 nm (0.21 nm peak-to-peak). Furthermore, structured-water layers on a hydrophobic graphite Surface were visualized by two-dimensional frequency shift mapping. The results were compared with a molecular-scale hydration structure at an interface between a hydrophilic Mica Surface and water.

Neil C Sturchio - One of the best experts on this subject based on the ideXlab platform.

  • molecular scale density oscillations in water adjacent to a Mica Surface
    Physical Review Letters, 2001
    Co-Authors: L Cheng, Paul Fenter, Kathryn L Nagy, Michel L Schlegel, Neil C Sturchio
    Abstract:

    High-resolution specular x-ray reflectivity of the Mica(001)-water interface under ambient conditions reveals oscillations in water oxygen density in the Surface-normal direction, giving evidence of interfacial water ordering. The spacings between neighboring water layers in the near-Surface, strongly oscillatory region are 2.5(2)-2.7(2) A, approximately the size of the water molecule. The density oscillations extend to about 10 A above the Surface and do not strictly maintain a solvent-size periodicity as that in interfacial liquid metal and hard-sphere molecular liquids. We interpret this oscillatory density profile of the interfacial water as due to the "hard-wall" effect of the molecularly smooth Mica Surface.

  • molecular scale density oscillations in water adjacent to a Mica Surface
    Physical Review Letters, 2001
    Co-Authors: L Cheng, Paul Fenter, Kathryn L Nagy, Michel L Schlegel, Neil C Sturchio
    Abstract:

    High-resolution specular x-ray reflectivity of the Mica(001)-water interface under ambient conditions reveals oscillations in water oxygen density in the Surface-normal direction, giving evidence of interfacial water ordering. The spacings between neighboring water layers in the near-Surface, strongly oscillatory region are 2.5(2)‐ 2.7(2) A, approximately the size of the water molecule. The density oscillations extend to about 10 A above the Surface and do not strictly maintain a solvent-size periodicity as that in interfacial liquid metal and hard-sphere molecular liquids. We interpret this oscillatory density profile of the interfacial water as due to the “hard-wall” effect of the molecularly smooth Mica Surface. The structure of a liquid within nanometers of a solid Surface has crucial influences on solid-liquid interfacial properties, notably diffusion, solute adsorption, and dielectric properties. Theoretical studies based on Lennard-Jones potentials predict that the “hard-wall” effect of a smooth solid Surface would constrain the interfacial liquid, resulting in a layered density profile [1]— analogous to the solvation (or, for water, hydration) ordering surrounding an isolated solute in a bulk liquid. Liquid density oscillations near solid Surfaces have indeed been observed in a liquid metal (Ga) [2] and in normal molecular liquids

Noriaki Oyabu - One of the best experts on this subject based on the ideXlab platform.

  • visualization of hydration layers on muscovite Mica in aqueous solution by frequency modulation atomic force microscopy
    Journal of Chemical Physics, 2013
    Co-Authors: Kei Kobayashi, Noriaki Oyabu, K Suzuki, Kenjiro Kimura, Shinichiro Ido, Takashi Imai, Katsunori Tagami, Masaru Tsukada, Hirofumi Yamada
    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.

  • atomic resolution imaging of graphite water interface by frequency modulation atomic force microscopy
    Applied Physics Express, 2011
    Co-Authors: K Suzuki, Noriaki Oyabu, Kei Kobayashi, Kazumi Matsushige, Hirofumi Yamada
    Abstract:

    Atomic-resolution images of a graphite (0001) Surface in water were successfully obtained by frequency modulation atomic force microscopy. Atomic scale features with a periodicity of 0.25 nm were resolved with an interaction force of less than 100 pN using a stiff cantilever and a very small oscillation amplitude of 0.11 nm (0.21 nm peak-to-peak). Furthermore, structured-water layers on a hydrophobic graphite Surface were visualized by two-dimensional frequency shift mapping. The results were compared with a molecular-scale hydration structure at an interface between a hydrophilic Mica Surface and water.