Evaluation of hydrophilicity and hydrophobicity
- Water Vapor Adsorption Method & Chemical Force Microscopy(CFM) -

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Summary

Hydrophilic and hydrophobic properties on the material like powder on which the contact angle cannot be measured can be evaluated by Water Vapor Adsorption Method.

The distribution of functional groups which have strong interaction with a hydroxyl group on a surface can be measured by Chemical Force Microscopy (CFM).

Evaluation of hydrophilicity and hydrophobicity by Water Vapor Adsorption

Water vapor adsorption isotherms

The shape of adsorption isotherms
means → Degree of water vapor adsorption on a solid surface

In the low pressure range, the adsorption isotherm slope of the Nafion film was sharper than that of the polyimide film. This means that hydrophlicity of the Nafion is higher than that of the Polyimide.

Evaluation of the Chemical Interaction of a surface functional group with the hydrophilic probe of Chemical Force Microscopy (CFM)

Frictional force measured by CFM

 

Nafion showed stronger interaction with hydroxyl groups than Polyimide. It was clarified by CFM analysis that Nafion has stronger hydrophilicity than Polyimide.

Search Number 4045

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