Page 7 - Shimadzu SPM-8100FM

Observational Examples of Hydration/Solvation Structure

What are Hydration and Solvation? The Hydration/Solvation Measurement Method

It is known that liquids in contact with solids become stratified, a 1. Run the HR-SPM in a solution, bringing the cantilever close to the surface of the solid sample with high precision, up to the settings value (fmax).
Water molecule
phenomenon called solvation, or in the case of water, hydration. 2. Use the force curve method to measure the force on the probe on the tip of the cantilever.
It is believed that this characteristic structure, which is different Hydration 3. Variations in characteristic power ( f) in accordance with the sample can be obtained in the immediate vicinity of the solid-liquid interface.
distance
from that of a bulk liquid, is the main influence on the various 4. Variation of the force is due to hydration/solvation, which provides insight into the stratification structure in the liquid.
r23
roles played by solid-liquid interfaces, such as dissolution, 5. A cross section of the hydration/solvation structure can be visualized by performing continuous acquisition in the X-direction (Z-X measurement).
r12
chemical reactions, charge transfers, wetting, lubrication, and Solid-liquid 6. Furthermore, the 3D structure of the solid-liquid interface can be analyzed by acquiring Z-X measurements in the Y direction.
heat transfer in the liquid phase. However, because this layer is Solid sample interface Tip Scanning Trace
z z z
extremely thin, the hydration/solvation structure is not easy to AFM Tip Water AFM Probe
Model of Hydration Structure molecule
measure experimentally. In particular, non-uniform structures in Density
Large Interaction force
the in-plane direction of the surface have not yet been detected. Measurement Sparse Small
Z-X
Variation Dense Large
of
Differences from Existing AFM Technology the Force Sparse
0 f Dense
When measuring hydration/solvation, the variation in the force on the cantilever is very small. However, by using an f max
Force curve x Dense
ultra-high sensitivity FM method, this can now be measured for the first time. y
Density distribution function
Such methods enable not only the measurement of hydration/solvation structures in the Z-X direction, but also the g (z)
Sample surface
analysis of 3D Z-XY structures. HR-SPM capabilities have now advanced from mere surface observations to Pattern Diagram of Hydration/Solvation Measurement Diagram of Hydration/Solvation Measurement
measurements of the structure of solid-liquid interfaces.

Force Curve by Existing AFM Force Curve by FM Method Data Analysis Software

This software is designed specifically for 3D mapping data analysis. It provides powerful support for analyzing hydration
and solvation structure data.

2D image data 3D display

Hydration Measurement Using the FM Method 4) Observation and Analysis of 3D Hydration
Structures at a Solid-Liquid Interface 5)
Z

1.5 nm 3rd layer
2nd layer
1st layer
Z=1.6nm Z=1.6nm
Surface 1D data
Z-X mapping of f 3 nm X
The layered hydration structure X=3nm Y=2.3nm X=3nm Y=2.3nm Displaying 3D mapping data
of a mica surface can be visual Extracting and displaying 2D images from the mapping data
All data on this page was obtained using the petri dish type solution cell (option). Displaying and analyzing specified 1D data over 2D image data

SPM-8100FM
6 High Resolution Scanning Probe Microscope 7