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Contact Angle Meter

DMe-211  

DMe-211

Simple device
 
DMs-401  

DMs-401

Basic device
DMo-series  

DMo-series

Versatile devices
 
DMo-WA-series  

DMo-WA-series

Wafers and disc-shaped samples
PCA-11  

PCA-11

Portable device
 
MCA-3  

MCA-3

Micro droplets
FPD-CP11  

FPD-CP11

Large flat panels, wafer
 
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Measurement of Contact Angle
 

The contact angle is an easy measurement method to determine the wettability of a solid substrate by a liquid. When depositing a droplet onto a solid substrate, the liquid will form a drop shape. The point where the solid, the liquid and vapor meet, is called the three-face point and it determines the contact angle. The contact angle is also an indicator for the wettability, which is dependent on the combination of solid substrate and liquid, as well as on the environment.

The relationship between the contact angle, the solid surface free energy, the liquid surface tension and the interfacial tension between solid and liquid is defined by the Young equation: 

young_equation

γS = γL cosθ + γSL

 

θ:  

Contact angle

γS:

Surface free energy of the solid

γL

Surface tension of the liquid

γSL

Interfacial tension between solid and liquid

 

In general, the following rule applies: The larger the contact angle the worse the wettability, the lower the contact angle the better the wettability.

bad wettability good wettability
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