Related Experiment Video
Updated: Aug 8, 2026
10:28
Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy
Published on: May 27, 2018
Study of water properties in nanospace
Noritada Kaji1, Ryo Ogawa, Akio Oki
1Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan. kaji@apchem.nagoya-u.ac.jp
Analytical and Bioanalytical Chemistry
|May 26, 2006
Summary
Water viscosity increases in nanometer-confined spaces, impacting hydrodynamic flow. This finding is crucial for optimizing nanopillar chip performance in DNA separation technologies.
Area of Science:
- Fluid dynamics
- Nanotechnology
- Physical chemistry
Background:
- Confined fluids exhibit unique properties distinct from bulk solutions.
- Nanometer-confined spaces are critical in microfluidic devices for applications like DNA separation.
- Understanding fluid behavior at the nanoscale is essential for device design and efficiency.
Purpose of the Study:
- To investigate the anomalous behavior of water viscosity and hydrodynamic flow within nanometer-confined environments.
- To assess the impact of nanoscale confinement on water's physical properties.
- To provide insights for enhancing the performance of nanopillar chips used in DNA separation.
Main Methods:
- Utilized a nanopillar chip, a model for nanometer-confined spaces.
- Employed single-particle tracking (SPT) technique to analyze fluid dynamics.
- Measured diffusion coefficients of nanospheres within the confined space.
Main Results:
- Observed diffusion coefficients of nanospheres were approximately one-third of theoretical values predicted by the Stokes-Einstein equation.
- This significant reduction in diffusion indicates increased water viscosity in the nanometer-confined space.
- Provided indirect evidence for higher water viscosity compared to bulk solutions.
Conclusions:
- Water viscosity is significantly higher in nanometer-confined spaces than in bulk solutions.
- The anomalous viscosity and flow behavior of water in nanopillar chips must be considered for improved DNA separation.
- Further research into nanoscale fluid dynamics is necessary for advancing microfluidic technologies.
More Related Videos
Related Concept Videos
01:23States of Water
Water exists in any one of the three classical states: solid (ice), liquid (water), and gas (steam or water vapor). The state of water depends on i) the intermolecular forces that draw molecules together and ii) the kinetic energy that leads to movements that pull them apart.
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
01:22Surface Tension of Fluid
Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies with...
Surface tension varies with...
02:05Entropy and Solvation
The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ ≥ 15); an...